ISO 4679:2023

Ships and marine technology — Hydraulic performance tests for waterjet propulsion system

This document specifies the measurement and acceptance criteria and the test report of hydraulic performance tests for waterjet propulsion system of Class A and Class B. The test methods for the waterjet propulsion pump with and without the inlet duct are both specified. This document is applicable to the hydraulic performance test of water jet propulsion under the specified test conditions. This document specifies the precision grade of Class A for hydraulic model tests of water jet propulsion and Class B for acceptance tests of small and middle-sized or intermediate test models. In addition, this document specifies the test conditions of Class A and Class B, and recommendations and requirements for test equipment to ensure that the test can be carried out under the conditions of corresponding accuracy. This document does not include miscellaneous parts of waterjet unit, such as steering and reversing gear, hydraulic system and control system.

Navires et technologie maritime — Essais de performance hydraulique pour le système de propulsion hydrojet

General Information

• Status: Published
• Publication Date: 18-Jun-2023
• ICS: 47.020.20 - Marine engines and propulsion systems
• Technical Committee: ISO/TC 8/SC 8 - Ship design
• Drafting Committee: ISO/TC 8/SC 8/WG 14 - Propulsion system
• Current Stage: 6060 - International Standard published
• Start Date: 19-Jun-2023
• Due Date: 12-Dec-2023
• Completion Date: 19-Jun-2023

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 4679
First edition
2023-06
Ships and marine technology —
Hydraulic performance tests for
waterjet propulsion system
Navires et technologie maritime — Essais de performance
hydraulique pour le système de propulsion hydrojet
Reference number
ISO 4679:2023(E)
© ISO 2023

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ISO 4679:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
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ISO 4679:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 1
4 Measurement and acceptance criteria . 3
4.1 General . 3
4.2 Measurement range . 4
4.3 Stable operating conditions of measuring systems . 4
4.4 E valuation of flow and head . 5
4.5 E valuation of efficiency or power . 5
5 Measurement uncertainty .6
5.1 General . 6
5.2 Statistical evaluation of overall measurement uncertainty . 6
5.2.1 E valuation of the random uncertainty . 6
5.2.2 E valuation of the systematic uncertainty . 6
5.2.3 Overall uncertainty . 7
5.2.4 Determination of overall uncertainty of efficiency . 7
5.3 Conversion . 8
5.3.1 Conversion to the guarantee conditions . 8
5.3.2 Translation of the test results. 8
6 Test method . 9
6.1 Test condition . 9
6.1.1 Test location . . 9
6.1.2 Test personnel . . 9
6.1.3 Test date . 9
6.1.4 Test outline . 9
6.1.5 Environment and water quality . . 9
6.2 Test device . 10
6.3 Test items . 10
6.3.1 General . 10
6.3.2 Performance test . 10
6.3.3 NPSH test . 11
7 Test report .11
Annex A (informative) Test report .12
Annex B (informative) Working section of the test device .15
Bibliography .18
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ISO 4679:2023(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 8, Ship design.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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INTERNATIONAL STANDARD ISO 4679:2023(E)
Ships and marine technology — Hydraulic performance
tests for waterjet propulsion system
1 Scope
This document specifies the measurement and acceptance criteria and the test report of hydraulic
performance tests for waterjet propulsion system of Class A and Class B.
The test methods for the waterjet propulsion pump with and without the inlet duct are both specified.
This document is applicable to the hydraulic performance test of water jet propulsion under the
specified test conditions. This document specifies the precision grade of Class A for hydraulic model
tests of water jet propulsion and Class B for acceptance tests of small and middle-sized or intermediate
test models.
In addition, this document specifies the test conditions of Class A and Class B, and recommendations
and requirements for test equipment to ensure that the test can be carried out under the conditions of
corresponding accuracy.
This document does not include miscellaneous parts of waterjet unit, such as steering and reversing
gear, hydraulic system and control system.
2 Normative references
There are no normative references in this document.
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
waterjet unit
unit that consists of waterjet propulsion system (3.2), steering and reversing gear, hydraulic system and
control system which is able to steer and reverse the main body
3.2
waterjet propulsion system
propulsion system that consists of waterjet pump (3.3), nozzle and inlet duct (generally the impeller of
waterjet pump is integrated with the nozzle) and that is able to drive the main body moving
3.3
waterjet pump
pump that transfers the energy of prime mover to water by rotating impeller
Note 1 to entry: The waterjet pump obtains a counter-acting force and drives the main body moving. It consists
of impeller, guide vane, shell and shaft (hereinafter referred to as “pump”). The main types are mixed-flow type
and axial flow type. The axial flow waterjet pump is one in which the liquid is discharged axially from the
impeller. The mixed-flow waterjet pump is one in which the liquid is discharged from impeller with an angle α (
09°<α <°0 ) to the shaft line, also called the inclined waterjet pump.
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ISO 4679:2023(E)
3.4
flow rate
Q
volume of liquid discharged by waterjet pump (3.3) per unit time
3.5
pump total head
H
algebraic difference between the outlet total head, H , and the inlet total head, H
2 1
Note 1 to entry: Pump total head is given by Formula (1):
HH=− H (1)
21
where
H is the inlet total head, expressed in Pa;
1
H is the outlet total head, expressed in Pa.
2
Note 2 to entry: Unless otherwise specified, the baseline of the head is the waterjet propulsion shaft line.
[SOURCE: ISO 9906:2012, 3.2.15, modified — notes 1 and 2 to entry have been modified.]
3.6
pump power input
P
power transmitted to the pump by its driver
[SOURCE: ISO 17769-1:2012, 2.1.11.2, modified — note 1 to entry has been deleted.]
3.7
pump efficiency
η
proportion of the pump power input (3.6), P, delivered as pump power output, P , at given operating
u
conditions
Note 1 to entry: Pump efficiency is given by Formula (2):
P
u
η= (2)
P
where
P is useful mechanical power transferred to the liquid during its passage through the pump, given
u
by Formula (3);
Pg=ρ QH (3)
u
[SOURCE: ISO 17769-1:2012, 2.1.12.1, modified — Formula (3) has been added and the symbols have
been explained.]
3.8
type number
K
dimensionless quantity, defined by Formula (4):
1 1
2 2
′ ′
2πnQ ωQ
K = = (4)
3 3
′ 4 ′ 4
()gH ()y
2
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ISO 4679:2023(E)
where
3
Q′ is volume flow rate per eye, expressed in m /s;
H′ is head of the first stage, expressed in m;
−1 −1
ω is expressed in time, like s , and n is expressed in 60 × min form.
Note 1 to entry: The type number should be taken according to the maximum diameter of the first stage impeller.
3.9
net positive suction head
NPSH
pump inlet total head above the head, equivalent to the vapour pressure per unit volume liquid, i.e.
pump inlet total head adds head equivalent to atmospheric pressure and subtracts head equivalent to
the vapour pressure
Note 1 to entry: Net positive suction head is calculated by Formula (5):
pp−
bv
NPSH=−Hz + (5)
1D
ρg
where
p
is (absolute) atmospheric pressure, expressed in Pa;
b
p
is (absolute) vapour pressure, expressed in Pa;
v
z
is height of impeller inlet, expressed in m.
D
[SOURCE: ISO 17769-1:2012, 2.1.5.5, modified — definition has been modified; the symbols have been
modified and the notes 2, 3 and 4 to entry have been deleted.]
3.10
guarantee point
operating performance of the pump which the supplier guarantees to be achieved under specified
conditions
[SOURCE: ISO 17769-1:2012, 2.1.13.2, modified — note 1 to entry has been deleted.]
4 Measurement and acceptance criteria
4.1 General
The basic parameters of the waterjet hydraulic performance tests directly obtained from the
measurement are flow rate, pressure, torque and speed of rotation. The derived parameters calculated
from the basic parameters are head, shaft power and efficiency. All of these parameters shall meet the
acceptance criteria specified in this clause.
Table 1 gives the acceptance level of pump head, flow rate, shaft power and efficiency. All acceptance
criteria are expressed as percentages of guarantee values. The test equipment shall meet the measuring
precision requirements. The measuring apparatus and their calibration should be confirmed. Both the
purchaser and manufacturer shall be entitled to have representatives present at all tests. The date of
the test shall be mutually agreed by the purchaser and manufacturer. Acceptance criteria shall meet the
requirements in Table 1 and if applicable, any agreements between the purchaser and manufacturer.
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ISO 4679:2023(E)
Table 1 — Acceptance criteria for Class A and Class B
Class A Class B
Quantity
% %
Flow rate ±1,5 ±2,0
Speed of rotation ±0,2 ±0,5
Torque ±1 ±1,4
Pump total head ±1 ±1,5
Pump power input ±1 ±1,5
Pump efficiency ±2,25 ±2,9
A guarantee point may be detailed in a written contract, a customer-specific waterjet performance
curve, or similar written and project specific documentation.
If not otherwise agreed upon between the purchaser and the manufacturer, the following should apply.
a) The acceptance grade should be in accordance with the grades given in Table 1.
b) Tests should be carried out on the test stand of the manufacturer’s works with clean, cold water,
using the methods and test arrangements specified in this document.
c) The waterjet performance should be guaranteed between the waterjet’s inlet connection and outlet
connection.
d) Pipe and fittings (bends, reducers, and valves) outside the waterjet are not a part of the guarantee.
The combination of manufacturing and measurement tolerances in practice necessitates the usage of
tolerances on tested values. The tolerances given in Table 1 take into account both manufacturing and
measurement tolerances.
The performance of a waterjet varies substantially with the nature of the liquid being pumped. Although
it is not possible to give general requirements and guidelines in which clean, cold water can be used to
predict performance with other liquids, it is desirable for the parties to agree on empirical rules to suit
the particular circumstances.
For batch products, the number of waterjets which are tested should be agreed between the purchaser
and manufacturer.
4.2 Measurement range
The flow rate is measured within the range of 80 % to 110 % of the best efficiency point or duty point at
identical speed of rotation.
The variation between the measured speed of rotation and specified speed of rotation should be
within ±20 % for Class A and the range from 60 % to 120 % for Class B.
4.3 Stable operating conditions of measuring systems
The test should be carried out on the test stand which meets the corresponding precision grade. The
test stand may be the manufacturer’s test works, or a test stand mutually agreed between the purchaser
and the manufacturer. The precision grade of the test equipment is decided by the measuring system.
The flow rate, inlet and outlet pressure, speed of rotation, torque, which are naturally fluctuating
when measured in the tests, as well as the signals, are automatically recorded or the statistical records
accumulate. The readings of delivered signals should satisfy the stable condition.
If the design or operation of the pump causes a large fluctuation in the measured value, a buffer device
may be installed in the measuring instrument or its connecting pipeline, to reduce the fluctuation
to the range given in Table 2 for measurement. Buffer devices should be symmetrical and linear, like
capillaries, which should provide integral values that contain at least one complete fluctuation period.
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ISO 4679:2023(E)
Table 2 — Permissible amplitude of fluctuation as a percentage of mean value of quantities
being measured
Permissible amplitude of fluctuations
Measured quantity
Class A Class B
% %
Flow rate ±2 ±3
Differential head ±3 ±4
Pressure ±2 ±3
Pump power input ±2 ±3
Speed of rotation ±0,5 ±1
Torque ±2 ±3
Temperature 0,3 °C 0,3 °C
Several sets of readings should be taken for each operating point considered. The arithmetic mean of
the mean values from all sets of readings for each quantity should be taken as the actual value given
by the test for the operating conditions considered. This actual value is used to ensure that the overall
tolerance of the measuring system meets the uncertainty requirement of the corresponding grade. A
minimum of three sets of readings should be taken at unequal intervals at the chosen point and the
mean value of each quantity and the efficiency derived from each set of readings should be recorded.
The variation of quantities shall meet the requirement of Table 3 (see ISO 5198).
Table 3 — Limits of variation between repeated mean values of the same quantity
(based on 95 % confidence limits)
Flow rate, pump total head, torque and pump power input Speed of rotation
Number of sets
of readings
% %
3 0,8 0,25
5 1,6 0,5
7 2,2 0,7
9 2,8 0,9
4.4 Evaluation of flow and head
Guarantee point evaluation should be performed at the rated rotational speed. It is not necessary to
recalculate the test points based on rotational speed in cases where the test rotational speed is identical
to the rated rotational speed. For tests in which the test rotational speed is different from the rated
rotational speed, each test point should be recalculated to the rated rotational speed, using the affinity
laws.
The acceptance criteria of flow rate should be applied to its guarantee point at the guarantee head, and
vice versa.
If there is no special requirement, the guarantee pump total head, H , is usually measured under the
G
condition of guarantee flow rate of Q . It shall meet the acceptance requirements that the absolute
G
value of the deviation between the head and the guarantee pump total head H is not greater than the
G
head tolerance value. If the purchaser and the manufacturer agree, the method of determining
guarantee flow rate, Q , under guarantee pump total head, H , may also be used.
G G
4.5 Evaluation of efficiency or power
If the efficiency or power has been guaranteed, it should be evaluated against the applicable acceptance
grade tolerance factor, i.e. the same as for QH/ in the following manner.
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ISO 4679:2023(E)
After a best-fit test curve (QH− / Q−η / or QP− curves) is drawn and smoothly fitted through the
measured test points, an additional straight line should be drawn between the origin (0 rate of flow, 0
head) and the guarantee point (rate of flow/head). If necessary, this line should be extended until it
crosses the fitted test curve. The intersection between the smoothly fitted test curve and this straight
line should form a new point of rate of flow/head, which is used for evaluation of efficiency or power.
The measured input power or calculated efficiency at this point should be compared against the
guarantee value and the applicable power or efficiency tolerance factors.
NOTE 1 The line from the origin method is used when evaluating the guarantee efficiency or power because
it best retains the waterjet characteristics if the impeller diameter is changed. Additionally, this method always
gives one single point of reference for evaluation.
NOTE 2 The tolerance limits for flow and head can be reduced as a result of adding a power guarantee.
5 Measurement uncertainty
5.1 General
Every measurement is inevitably subject to some uncertainty, even if the measuring procedures and
the instruments, as well as the methods of analysis, fully comply with the recommendations and
requirements of this document.
5.2 Statistical evaluation of overall measurement uncertainty
5.2.1 Evaluation of the random uncertainty
The random uncertainty due either to the characteristics of the measuring system or to variations of the
measured quantity, or both, appears directly as a scatter of the measurements. Unlike the systematic
uncertainty, the random component can be reduced by increasing the number of measurements of the
same quantity under the same conditions.
A set of readings not less than three should be taken at each test point.
5.2.2 Evaluation of the systematic uncertainty
After all the known errors have been removed by zero adjustment, calibration, careful measurement
of dimensions, proper installation, etc., there remains an uncertainty which never disappears. This
uncertainty cannot be reduced by repeating the measurement if the same instrument and the same
method of measurement are used. Permissible relative values for the systematic uncertainty in this
document are given in Table 4.
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ISO 4679:2023(E)
Table 4 — Permissible relative values of the instrumental uncertainty, e
s
Maximum permissible systematic uncertainty
(at guarantee point)
Measured quantity
Class A Class B
% %
Flow rate ±1,0 ±1,5
Pump total head ±1,0 ±1,0
Outlet pressure ±0,9 ±1,0
Inlet pressure ±0,5 ±1,0
Suction head for NPSH test ±0,9 ±1,0
Driver power input ±0,9 ±1,0
Speed of rotation ±0,35 ±1,4
Torque ±0,9 ±2,0
5.2.3 Overall uncertainty
The value for overall uncertainty, e, is given by the derived quantity of systematic uncertainty and
random uncertainty. Permissible values of overall measurement uncertainty, e, are given in Table 5.
Table 5 — Permissible values of overall uncertainties, e
Class A Class B
Quantity
% %
Flow rate ±1,5 ±2,0
Speed of rotation ±0,2 ±0,5
Torque ±1,0 ±1,4
Pump total head ±1,0 ±1,5
Motor power input ±1,0 ±1,5
Pump power input (derived by
±1,0 ±1,5
torque and speed of rotation)
Pump power input (determined
from the motor power input and ±1,3 ±2,0
the efficiency of the motor)
5.2.4 Determination of overall uncertainty of efficiency
The overall uncertainty of efficiency is divided into the amount calculated from the torque and the
speed of rotation, or the amount calculated from the pump input power.
Using the values given in Table 5, the calculations lead to the results given in Table 6.
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ISO 4679:2023(E)
Table 6 — Resulting greatest values of the overall uncertainties of efficiency, e
Class A Class B
Quantity
% %
Overall efficiency
±2,0 ±2,9
(computed from Q, H, P )
gr
Pump efficiency
±2,0 ±2,9
(computed from Q, H, M, n)
Pump efficiency
±2,25 ±3,2
(computed from Q, H, P , η η )
gr mot mot
5.3 Conversion
5.3.1 Conversion to the guarantee conditions
The quantities required to verify the characteristics guaranteed by the manufacturer are generally
measured under conditions different from those on which the guarantee is based.
If tests have been conducted under the guarantee conditions, it is necessary to translate the quantities
measured under different conditions to those guarantee conditions in order to determine whether the
guarantee is fulfilled.
5.3.2 Translation of the test results
All test data obtained at the speed of rotation, n , in deviation from the specified speed of rotation, n
T SP
, should be translated to data based on the specified speed of rotation, n . The variation of speed shall
SP
meet the range requirement stated in 4.2:
— flow rate Q , pump total head H , pump power input P , pump efficiency η , density ρ at test
T T T T T
speed of rotation;
— Flow rate Q , pump total head H , pump power input P , pump efficiency η , density ρ at
SP SP SP SP SP
specified speed of rotation.
The measured data of the flow rate, Q, pump total head, H, and pump power input, P, can be converted
by means of Formulae (6), (7), (8) and (9):
n
SP
QQ= (6)
SP T
n
T
2
n
 
SP
HH= (7)
SP T  
n
 T 
3
n ρ
 
SP SP
PP= ⋅ (8)
SP T  
n ρ
 
T T
8
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ISO 4679:2023(E)
η =η (9)
SP T
Additionally, the results obtained for the NPSH can be converted by means of Formula (10):
R
x
n 
SP
NPSH =NPSH (10)
 
R,SP R,T
n
 
T
As a first approximation for the NPSH, the value x = 2 may be used if the specified condition given in
4.2 for the speed of rotation and flow rate has been fulfilled, and if the physical state of the liquid at
the impeller inlet is such that no gas separation can affect the operation of the waterjet. If the waterjet
operates near its cavitation limits, or if the deviation of the test speed from the specified speed exceeds
the specification given in 4.2, the phenomena can be influenced by, for instance, the thermodynamic
effects, the variation of the surface tension, or the differences in dissolved or occluded air content.
Values of exponent x between 1,3 and 2 have been observed and an agreement between the parties is
mandatory to establish the conversion formula to be used.
In the case of combined motor waterjet units or if the guarantees are with respect to agreed frequency
and voltage instead of an agreed speed of rotation, flow rate, pump total head, pump power input and
pump efficiency data are subject to the abovementioned conversion requirements, i.e. Formulae (6), (7),
(8) and (9), provided n is replaced with the frequency, f , and n with frequency, f . Such
SP SP T T
conversion, however, should be restricted to cases where the selected frequency during the test varies
by no more than 1 %. If the voltage used in the test is no more than 5 % above o
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 4679
ISO/TC 8/SC 8
Ships and marine technology —
Secretariat: KATS
Hydraulic performance tests for
Voting begins on:
2023-03-09 waterjet propulsion system
Voting terminates on:
2023-05-04
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 4679:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 1 ----------------------
ISO/FDIS 4679:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 4679
ISO/TC 8/SC 8
Ships and marine technology —
Secretariat: KATS
Hydraulic performance tests for
Voting begins on:
waterjet propulsion system
Voting terminates on:
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: [phone]
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: [e-mail]
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 4679:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 2 ----------------------
ISO/FDIS 4679:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 1
4 Measurement and acceptance criteria . 3
4.1 General . 3
4.2 Measurement range . 4
4.3 Stable operating conditions of measuring systems . 4
4.4 E valuation of flow and head . 5
4.5 E valuation of efficiency or power . 6
5 Measurement uncertainty .6
5.1 General . 6
5.2 Statistical evaluation of overall measurement uncertainty . 6
5.2.1 E valuation of the random uncertainty . 6
5.2.2 E valuation of the systematic uncertainty . 6
5.2.3 Overall uncertainty . 7
5.2.4 Determination of overall uncertainty of efficiency . 7
5.3 Conversion . 7
5.3.1 Conversion to the guarantee conditions . 7
5.3.2 Translation of the test results. 8
6 Test method . 9
6.1 Test condition . 9
6.1.1 Test location . . 9
6.1.2 Test personnel . . 9
6.1.3 Test date . 9
6.1.4 Test outline . 9
6.1.5 Environment and water quality . . 9
6.2 Test device . 9
6.3 Test items . 9
6.3.1 General . 9
6.3.2 Performance test . 10
6.3.3 NPSH test . 10
7 Test report .11
Annex A (informative) Test report.12
Annex B (informative) Working section of the test device .15
Bibliography .18
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ISO/FDIS 4679:2023(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non­governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 8, Ship design.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 4679:2023(E)
Ships and marine technology — Hydraulic performance
tests for waterjet propulsion system
1 Scope
This document specifies the measurement and acceptance criteria and the test report of hydraulic
performance tests for waterjet propulsion system of Class A and Class B.
The test methods for the waterjet propulsion pump with and without the inlet duct are both specified.
This document is applicable to the hydraulic performance test of water jet propulsion under the
specified test conditions. This document specifies the precision grade of Class A for hydraulic model
tests of water jet propulsion and Class B for acceptance tests of small and middle-sized or intermediate
test models.
In addition, this document specifies the test conditions of Class A and Class B, and recommendations
and requirements for test equipment to ensure that the test can be carried out under the conditions of
corresponding accuracy.
This document does not include miscellaneous parts of waterjet unit, such as steering and reversing
gear, hydraulic system and control system.
2 Normative references
There are no normative references in this document.
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
waterjet unit
unit that consists of waterjet propulsion system (3.2), steering and reversing gear, hydraulic system and
control system which is able to steer and reverse the main body
3.2
waterjet propulsion system
propulsion system that consists of waterjet pump (3.3), nozzle and inlet duct (generally the impeller of
waterjet pump is integrated with the nozzle) and that is able to drive the main body moving
3.3
waterjet pump
pump that transfers the energy of prime mover to water by rotating impeller
Note 1 to entry: The waterjet pump obtains a counter-acting force and drives the main body moving. It consists
of impeller, guide vane, shell and shaft (hereinafter referred to as “pump”). The main types are mixed-flow type
and axial flow type. The axial flow waterjet pump is one in which the liquid is discharged axially from the
impeller. The mixed-flow waterjet pump is one in which the liquid is discharged from impeller with an angle α (
09°<α <°0 ) to the shaft line, also called the inclined waterjet pump.
1
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ISO/FDIS 4679:2023(E)
3.4
flow rate
Q
volume of liquid discharged by waterjet pump (3.3) per unit time
3.5
pump total head
H
algebraic difference between the outlet total head, H , and the inlet total head, H
2 1
Note 1 to entry: Pump total head is given by Formula (1):
HH=− H (1)
21
where
H is the inlet total head, expressed in Pa;
1
H is the outlet total head, expressed in Pa.
2
Note 2 to entry: Unless otherwise specified, the baseline of the head is the waterjet propulsion shaft line.
[SOURCE: ISO 9906:2012, 3.2.15, modified — notes 1 and 2 to entry have been modified.]
3.6
pump power input
P
power transmitted to the pump by its driver
[SOURCE: ISO 17769-1:2012, 2.1.11.2, modified — note 1 to entry has been deleted.]
3.7
pump efficiency
η
proportion of the pump power input (3.6), P, delivered as pump power output, P , at given operating
u
conditions
Note 1 to entry: Pump efficiency is given by Formula (2):
P
u
η= (2)
P
where
P is useful mechanical power transferred to the liquid during its passage through the pump, given
u
by Formula (3);
Pg=ρ QH (3)
u
[SOURCE: ISO 17769-1:2012, 2.1.12.1, modified — Formula (3) has been added and the symbols have
been explained.]
3.8
type number
K
2
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ISO/FDIS 4679:2023(E)
dimensionless quantity, defined by Formula (4):
1 1
2 2
′ ′
2πnQ ωQ
K = = (4)
3 3
4 4
gH′ y′
() ()
where
3
Q′ is volume flow rate per eye, expressed in m /s;
H′ is head of the first stage, expressed in m;
−1 −1
ω is expressed in time, like s , and n is expressed in 60 × min form.
Note 1 to entry: The type number should be taken according to the maximum diameter of the first stage impeller.
3.9
net positive suction head
NPSH
pump inlet total head above the head, equivalent to the vapour pressure per unit volume liquid, i.e.
pump inlet total head adds head equivalent to atmospheric pressure and subtracts head equivalent to
the vapour pressure
Note 1 to entry: Net positive suction head is calculated by Formula (5):
pp−
bv
NPSH=−Hz + (5)
1D
ρg
where
p
is (absolute) atmospheric pressure, expressed in Pa;
b
p
is (absolute) vapour pressure, expressed in Pa;
v
z
is height of impeller inlet, expressed in m.
D
[SOURCE: ISO 17769-1:2012, 2.1.5.5, modified — definition has been modified; the symbols have been
modified and the notes 2, 3 and 4 to entry have been deleted.]
3.10
guarantee point
operating performance of the pump which the supplier guarantees to be achieved under specified
conditions
[SOURCE: ISO 17769-1:2012, 2.1.13.2, modified — note 1 to entry has been deleted.]
4 Measurement and acceptance criteria
4.1 General
The basic parameters of the waterjet hydraulic performance tests directly obtained from the
measurement are flow rate, pressure, torque and speed of rotation. The derived parameters calculated
from the basic parameters are head, shaft power and efficiency. All of these parameters shall meet the
acceptance criteria specified in this clause.
Table 1 gives the acceptance level of pump head, flow rate, shaft power and efficiency. All acceptance
criteria are expressed as percentages of guarantee values. The test equipment shall meet the measuring
precision requirements. The measuring apparatus and their calibration should be confirmed. Both the
purchaser and manufacturer shall be entitled to have representatives present at all tests. The date of
3
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ISO/FDIS 4679:2023(E)
the test shall be mutually agreed by the purchaser and manufacturer. Acceptance criteria shall meet the
requirements in Table 1 and if applicable, any agreements between the purchaser and manufacturer.
Table 1 — Acceptance criteria for Class A and Class B
Class A Class B
Quantity
% %
Flow rate ±1,5 ±2,0
Speed of rotation ±0,2 ±0,5
Torque ±1 ±1,4
Pump total head ±1 ±1,5
Pump power input ±1 ±1,5
Pump efficiency ±2,25 ±2,9
A guarantee point may be detailed in a written contract, a customer-specific waterjet performance
curve, or similar written and project specific documentation.
If not otherwise agreed upon between the purchaser and the manufacturer, the following should apply.
a) The acceptance grade should be in accordance with the grades given in Table 1.
b) Tests should be carried out on the test stand of the manufacturer’s works with clean, cold water,
using the methods and test arrangements specified in this document.
c) The waterjet performance should be guaranteed between the waterjet’s inlet connection and outlet
connection.
d) Pipe and fittings (bends, reducers, and valves) outside the waterjet are not a part of the guarantee.
The combination of manufacturing and measurement tolerances in practice necessitates the usage of
tolerances on tested values. The tolerances given in Table 1 take into account both manufacturing and
measurement tolerances.
The performance of a waterjet varies substantially with the nature of the liquid being pumped. Although
it is not possible to give general requirements and guidelines in which clean, cold water can be used to
predict performance with other liquids, it is desirable for the parties to agree on empirical rules to suit
the particular circumstances.
For batch products, the number of waterjets which are tested should be agreed between the purchaser
and manufacturer.
4.2 Measurement range
The flow rate is measured within the range of 80 % to 110 % of the best efficiency point or duty point at
identical speed of rotation.
The variation between the measured speed of rotation and specified speed of rotation should be
within ±20 % for Class A and the range from 60 % to 120 % for Class B.
4.3 Stable operating conditions of measuring systems
The test should be carried out on the test stand which meets the corresponding precision grade. The
test stand may be the manufacturer’s test works, or a test stand mutually agreed between the purchaser
and the manufacturer. The precision grade of the test equipment is decided by the measuring system.
The flow rate, inlet and outlet pressure, speed of rotation, torque, which are naturally fluctuating
when measured in the tests, as well as the signals, are automatically recorded or the statistical records
accumulate. The readings of delivered signals should satisfy the stable condition.
4
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ISO/FDIS 4679:2023(E)
If the design or operation of the pump causes a large fluctuation in the measured value, a buffer device
may be installed in the measuring instrument or its connecting pipeline, to reduce the fluctuation
to the range given in Table 2 for measurement. Buffer devices should be symmetrical and linear, like
capillaries, which should provide integral values that contain at least one complete fluctuation period.
Table 2 — Permissible amplitude of fluctuation as a percentage of mean value of quantities
being measured
Permissible amplitude of fluctuations
Measured quantity
Class A Class B
% %
Flow rate ±2 ±3
Differential head ±3 ±4
Pressure ±2 ±3
Pump power input ±2 ±3
Speed of rotation ±0,5 ±1
Torque ±2 ±3
Temperature 0,3 °C 0,3 °C
Several sets of readings should be taken for each operating point considered. The arithmetic mean of
the mean values from all sets of readings for each quantity should be taken as the actual value given
by the test for the operating conditions considered. This actual value is used to ensure that the overall
tolerance of the measuring system meets the uncertainty requirement of the corresponding grade. A
minimum of three sets of readings should be taken at unequal intervals at the chosen point and the
mean value of each quantity and the efficiency derived from each set of readings should be recorded.
The variation of quantities shall meet the requirement of Table 3 (see ISO 5198).
Table 3 — Limits of variation between repeated mean values of the same quantity
(based on 95 % confidence limits)
Flow rate, pump total head, torque and pump power input Speed of rotation
Number of sets
of readings
% %
3 0,8 0,25
5 1,6 0,5
7 2,2 0,7
9 2,8 0,9
4.4 Evaluation of flow and head
Guarantee point evaluation should be performed at the rated rotational speed. It is not necessary to
recalculate the test points based on rotational speed in cases where the test rotational speed is identical
to the rated rotational speed. For tests in which the test rotational speed is different from the rated
rotational speed, each test point should be recalculated to the rated rotational speed, using the affinity
laws.
The acceptance criteria of flow rate should be applied to its guarantee point at the guarantee head, and
vice versa.
If there is no special requirement, the guarantee pump total head, H , is usually measured under the
G
condition of guarantee flow rate of Q . It shall meet the acceptance requirements that the absolute
G
value of the deviation between the head and the guarantee pump total head H is not greater than the
G
head tolerance value. If the purchaser and the manufacturer agree, the method of determining
guarantee flow rate, Q , under guarantee pump total head, H , may also be used.
G G
5
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ISO/FDIS 4679:2023(E)
4.5 Evaluation of efficiency or power
If the efficiency or power has been guaranteed, it should be evaluated against the applicable acceptance
grade tolerance factor, i.e. the same as for QH/ in the following manner.
After a best-fit test curve (QH− / Q−η / or QP− curves) is drawn and smoothly fitted through the
measured test points, an additional straight line should be drawn between the origin (0 rate of flow, 0
head) and the guarantee point (rate of flow/head). If necessary, this line should be extended until it
crosses the fitted test curve. The intersection between the smoothly fitted test curve and this straight
line should form a new point of rate of flow/head, which is used for evaluation of efficiency or power.
The measured input power or calculated efficiency at this point should be compared against the
guarantee value and the applicable power or efficiency tolerance factors.
NOTE 1 The line from the origin method is used when evaluating the guarantee efficiency or power because
it best retains the waterjet characteristics if the impeller diameter is changed. Additionally, this method always
gives one single point of reference for evaluation.
NOTE 2 The tolerance limits for flow and head can be reduced as a result of adding a power guarantee.
5 Measurement uncertainty
5.1 General
Every measurement is inevitably subject to some uncertainty, even if the measuring procedures and
the instruments, as well as the methods of analysis, fully comply with the recommendations and
requirements of this document.
5.2 Statistical evaluation of overall measurement uncertainty
5.2.1 Evaluation of the random uncertainty
The random uncertainty due either to the characteristics of the measuring system or to variations of the
measured quantity, or both, appears directly as a scatter of the measurements. Unlike the systematic
uncertainty, the random component can be reduced by increasing the number of measurements of the
same quantity under the same conditions.
A set of readings not less than three should be taken at each test point.
5.2.2 Evaluation of the systematic uncertainty
After all the known errors have been removed by zero adjustment, calibration, careful measurement
of dimensions, proper installation, etc., there remains an uncertainty which never disappears. This
uncertainty cannot be reduced by repeating the measurement if the same instrument and the same
method of measurement are used. Permissible relative values for the systematic uncertainty in this
document are given in Table 4.
Table 4 — Permissible relative values of the instrumental uncertainty, e
s
Maximum permissible systematic uncertainty
(at guarantee point)
Measured quantity
Class A Class B
% %
Flow rate ±1,0 ±1,5
Pump total head ±1,0 ±1,0
Outlet pressure ±0,9 ±1,0
Inlet pressure ±0,5 ±1,0
6
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ISO/FDIS 4679:2023(E)
TTaabbllee 44 ((ccoonnttiinnueuedd))
Maximum permissible systematic uncertainty
(at guarantee point)
Measured quantity
Class A Class B
% %
Suction head for NPSH test ±0,9 ±1,0
Driver power input ±0,9 ±1,0
Speed of rotation ±0,35 ±1,4
Torque ±0,9 ±2,0
5.2.3 Overall uncertainty
The value for overall uncertainty, e, is given by the derived quantity of systematic uncertainty and
random uncertainty. Permissible values of overall measurement uncertainty, e, are given in Table 5.
Table 5 — Permissible values of overall uncertainties, e
Class A Class B
Quantity
% %
Flow rate ±1,5 ±2,0
Speed of rotation ±0,2 ±0,5
Torque ±1,0 ±1,4
Pump total head ±1,0 ±1,5
Motor power input ±1,0 ±1,5
Pump power input (derived by
±1,0 ±1,5
torque and speed of rotation)
Pump power input (determined
from the motor power input and ±1,3 ±2,0
the efficiency of the motor)
5.2.4 Determination of overall uncertainty of efficiency
The overall uncertainty of efficiency is divided into the amount calculated from the torque and the
speed of rotation, or the amount calculated from the pump input power.
Using the values given in Table 5, the calculations lead to the results given in Table 6.
Table 6 — Resulting greatest values of the overall uncertainties of efficiency, e
Class A Class B
Quantity
% %
Overall efficiency
±2,0 ±2,9
(computed from Q, H, P )
gr
Pump efficiency
±2,0 ±2,9
(computed from Q, H, M, n)
Pump efficiency
±2,25 ±3,2
(computed from Q, H, P , η η )
gr mot mot
5.3 Conversion
5.3.1 Conversion to the guarantee conditions
The quantities required to verify the characteristics guaranteed by the manufacturer are generally
measured under conditions different from those on which the guarantee is based.
7
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ISO/FDIS 4679:2023(E)
If tests have been conducted under the guarantee conditions, it is necessary to translate the quantities
measured under different conditions to those guarantee conditions in order to determine whether the
guarantee is fulfilled.
5.3.2 Translation of the test results
All test data obtained at the speed of rotation, n , in deviation from the specified speed of rotation, n
T SP
, should be translated to data based on the specified speed of rotation, n . The variation of speed shall
SP
meet the range requirement stated in 4.2:
— flow rate Q , pump total head H , pump power input P , pump efficiency η , density ρ at test
T T T T T
speed of rotation;
— Flow rate Q , pump total head H , pump power input P , pump efficiency η , density ρ at
SP SP SP SP SP
specified speed of rotation.
The measured data of the flow rate, Q, pump total head, H, and pump power input, P, can be converted
by means of Formulae (6), (7), (8) and (9):
n
SP
QQ= (6)
SP T
n
T
2
n
 
SP
HH= (7)
SP T  
n
 
T
3
n ρ
 
SP SP
PP= ⋅ (8)
SP T  
n ρ
 
T T
η =η (9)
SP T
Additionally, the results obtained for the NPSH can be converted by means of Formula (10):
R
x
n
 
SP
NPSH =NPSH (10)
R,SP R,T  
n
 
T
As a first approximation for the NPSH, the value x = 2 may be used if the specified condition given in
4.2 for the speed of rotation and flow rate have been fulfilled, and if the physical state of the liquid at
the impeller inlet is such that no gas separation can affect the operation of the waterjet. If the w
...

2022-11-09
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ISO/FDIS 4679:20222023(E)
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ISO TC 8/SC 8/WG 14
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Date: 2023-02-23
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Secretariat: KATS
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Ships and marine technology — Hydraulic performance tests for waterjet
propulsion system
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ISO/FDIS 4679:2023(E)
© ISO 20222023 Formatted
All rights reserved. Unless otherwise specified, or required in the context of its implementation,
no part of this publication may be reproduced or utilized otherwise in any form or by any means,
electronic or mechanical, including photocopying, or posting on the internet or an intranet,
without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Fax: [phone]
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Email: [e-mail]
Website: www.iso.orgwww.iso.org
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Published in Switzerland
ii © ISO 2023 – All rights reserved

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ISO/FDIS 4679:2023(E)
Contents
Foreword . iv
Introduction. v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Acceptance criteria . 4
5 Measurement uncertainty . 7
6 Test method . 10
7 Test report . 12
Annex A (informative) . 13
Annex B (informative) . 16
Bibliography . 19
Foreword . iv
1 Scope . 6
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 1
4 Measurement and acceptance criteria . 5
4.1 General . 5
4.2 Measurement range . 6
4.3 Stable operating conditions of measuring systems . 6
4.4 Evaluation of flow and head . 7
4.5 Evaluation of efficiency or power . 7
5 Measurement uncertainty . 8
5.1 General . 8
5.2 Statistical evaluation of overall measurement uncertainty . 8
5.2.1 Evaluation of the random uncertainty . 8
5.2.2 Evaluation of the systematic uncertainty . 8
5.2.3 Overall uncertainty . 9
5.2.4 Determination of overall uncertainty of efficiency . 9
5.3 Conversion . 9
5.3.1 Conversion to the guarantee conditions . 9
5.3.2 Translation of the test results . 10
6 Test method . 11
6.1 Test condition . 11
6.1.1 Test location . 11
6.1.2 Test personnel . 11
6.1.3 Test date . 11
6.1.4 Test outline . 11
6.1.5 Environment and water quality . 11
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ISO/FDIS 4679:2023(E)
6.2 Test device . 12
6.3 Test items . 12
6.3.1 General . 12
6.3.2 Performance test . 12
6.3.3 NPSH test . 13
7 Test report . 13
Annex A (informative) Test report . 14
Annex B (informative) Working section of the test device . 19
Bibliography . 23

iv © ISO 2023 – All rights reserved

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ISO/FDIS 4679:2023(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national
standards bodies (ISO member bodies). The work of preparing International Standards is normally
carried out through ISO technical committees. Each member body interested in a subject for which a
technical committee has been established has the right to be represented on that committee.
International organizations, governmental and non-governmental, in liaison with ISO, also take part in
the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all
matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directiveswww.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patentswww.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 8, Ship design.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at
www.iso.org/members.htmlwww.iso.org/members.html.

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ISO/FDIS 4679:20222023(E)
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Ships and marine technology — Hydraulic performance tests for
waterjet propulsion system
1 Scope
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6 © ISO 2022 – All rights reserved
vi © ISO 2023 – All rights reserved

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ISO/FDIS 4679:20222023(E)
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This document specifies the measurement and acceptance criteria and the
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test report of hydraulic performance tests for waterjet propulsion system of
Class A and Class B.Introduction
The purpose of this document is to establish a standard for hydraulic performance test of water jet
propulsion.
The test methods for the waterjet propulsion pump with and without the inlet duct are both specified.
This document is applicable to the hydraulic performance test of water jet propulsion under the
specified test conditions. This document specifies the precision grade of Class A for hydraulic model
tests of water jet propulsion and Class B for acceptance tests of small and middle-sized or intermediate
test modelmodels.
In addition, this document specifies the test conditions of Class A and Class B, and recommendations
and requirements for test equipment to ensure that the test can be carried out under the conditions of
corresponding accuracy.
Formatted: Font: 11 pt
Formatted: Line spacing: single
© ISO 2022 – All rights reserved 7
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 4679:2023(E)

Formatted: Section start: New page, Different first page
header
Ships and marine technology — Hydraulic performance tests for
waterjet propulsion system
1 Scope
This document specifies the measurement and acceptance criteria and the test report of hydraulic
performance tests for waterjet propulsion system of Class A and Class B.
Class A stands for the precision level and is applicable for hydraulic model tests and prototype model
tests which require higher accuracy. Class A is mainly used for laboratorial research and scientific
purposes which require higher measurement accuracy. Class B stands for the engineering level and is
applicable for acceptance tests of batch inspections of small and middle-sized prototype models.
This document does not include miscellaneous parts of waterjet unit, such as steering and reversing
gear, hydraulic system and control system.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 17769-1, Liquid pumps and installation — General terms, definitions, quantities, letter symbols and
units — Part 1: Liquid pumps
There are no normative references in this document.
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the following terms and definitions apply.
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obphttps://www.iso.org/obp
Formatted: Hyperlink, English (United States)
Formatted: Indent: Left 0 ch
— IEC Electropedia: available at https://www.electropedia.org/https://www.electropedia.org/
Formatted: Hyperlink, Font: Cambria
3.1
waterjet unit
unit that consists of waterjet propulsion system (3.2), steering and reversing gear, hydraulic system and
Formatted: cite_sec
control system which is able to steer and reverse the main body
3.2
waterjet propulsion system
propulsion system that consists of waterjet pump (3.3), nozzle and inlet duct (generally the impeller of
Formatted: cite_sec
waterjet pump (3.3) is integrated with the nozzle) and that is able to drive the main body moving
Formatted: Font: Not Italic
3.3
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waterjet pump
pump that transfers the energy of prime mover to water by rotating impeller
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ISO/FDIS 4679:2023(E)
Note 1 to entry: The waterjet pump obtains a counter-acting force and drives the main body moving. It consists of
impeller, guide vane, shell and shaft (hereinafter referred to as “pump”). The main types are mixed-flow type and
axial flow type. The axial flow waterjet pump is one in which the liquid is discharged axially from the impeller. The
mixed-flow waterjet pump is one in which the liquid is discharged from impeller with an angle α ( 0°<α< 90° (
0°<α< 90° ) to the shaft line, also called the inclined waterjet pump.
Field Code Changed
3.4
flow rate
Q
volume of liquid discharged by waterjet pump (3.3) per unit time
Formatted: cite_sec
3.5
inlet total head
H1
overall energy at the inlet section of the pump
Note 1 to entry: Inlet total head is given by Formula (1):
2
pv
1 1
Hz=++ (1)
11
ρ g 2g
where
Formatted: Definition, Adjust space between Latin and
Asian text, Adjust space between Asian text and
numbers, Tab stops: Not at 19.85 pt + 39.7 pt + 59.55
 is inlet height above reference plane, expressed in m;
z
1
pt + 79.4 pt + 99.25 pt + 119.05 pt + 138.9 pt +
 is inlet pressure, expressed in Pa;
p 158.75 pt + 178.6 pt + 198.45 pt
1
3
ρ
 is density of liquid, expressed in kg/m ;
g 2
 is acceleration of gravity, expressed in m/s ;
 v is inlet velocity, expressed in m/s.
1
[SOURCE: ISO 9906:2012, 3.2.13, modified —v takes the place of U and the meaning of each term is
1 1
explained.]
3.6
outlet total head
H
2
overall energy at the outlet section of the pump
Note 1 to entry: Outlet total head is given by Formula (2):
2
pv
2 2
Hz=++ (2)
22
ρ g 2g
where
Formatted: Definition, Tab stops: Not at 19.85 pt +
39.7 pt + 59.55 pt + 79.4 pt + 99.25 pt + 119.05 pt +
138.9 pt + 158.75 pt + 178.6 pt + 198.45 pt
 z is outlet height above reference plane, expressed in m;
2
 p is outlet pressure, expressed in Pa;
2
Formatted: Font: 11 pt
 v is outlet velocity, expressed in m/s.
2
Formatted: Space Before: 0 pt, Line spacing: single
2 © ISO 2022 – All rights reserved
2 © ISO 2023 – All rights reserved

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ISO/FDIS 4679:2023(E)
Formatted: Right
[SOURCE: ISO 9906:2012, 3.2.14, modified —v takes the place of U and the meaning of each term is
2 2
explained.]
3.7
pump total head
Formatted: Don't keep with next
H
Formatted: Font: Bold
algebraic difference between the outlet total head (3.6), H H , and the inlet total head (3.5), H H
2 2 1 1
Formatted: Font: Not Italic
Formatted: Font: Not Italic
Note 1 to entry: Pump total head is given by Formula (31):
Field Code Changed
HH− H (1)
21
Field Code Changed
where
Formatted: Definition, Adjust space between Latin and
Asian text, Adjust space between Asian text and
H H− H (3)
numbers, Tab stops: Not at 19.85 pt + 39.7 pt + 59.55
21
pt + 79.4 pt + 99.25 pt + 119.05 pt + 138.9 pt +
158.75 pt + 178.6 pt + 198.45 pt
H1 is the inlet total head, expressed in Pa;
H is the outlet total head, expressed in Pa.
2
Note 2 to entry: Unless otherwise specified, the baseline of the head is the waterjet propulsion shaft line.
[SOURCE: ISO 9906:2012, 3.2.15, modified — notes 1 and 2 to entry have been modified.]
Formatted: Default Paragraph Font
3.86
pump power input
P
Formatted: Font: Bold
power transmitted to the pump by its driver
[SOURCE: ISO 17769-1:2012, 2.1.11.2], modified — note 1 to entry has been deleted.]
Formatted: Default Paragraph Font
Formatted: std_docPartNumber
3.97
pump efficiency
η
Formatted: Font: Bold
proportion of the pump power input (3.86), P, delivered as pump power output, P , at given operating
u
Formatted: cite_sec
conditions
Note 1 to entry: Pump efficiency is given by Formula (42):
P
u Field Code Changed
η= (4)
P
Formatted: Don't adjust space between Latin and Asian
text, Don't adjust space between Asian text and
P
u
numbers
η= (2)
P
Formatted Table
Formatted: Body Text, Space After: 0 pt, Don't adjust
where
space between Latin and Asian text, Don't adjust space
between Asian text and numbers
 P is useful mechanical power transferred to the liquid during its passage through the pump, given
u
by Formula (5); (3);
Formatted: cite_eq
P =ρ gQH (5) Formatted: Font: 11 pt
u
Formatted: Line spacing: single
© ISO 2022 – All rights reserved 3
© ISO 2023 – All rights reserved 3

=
=

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ISO/FDIS 4679:2023(E)
P =ρ gQH (3)
Field Code Changed
u
[SOURCE: ISO 17769-1:2012, 2.1.12.1], modified — Formula (3) has been added and the symbols have
Formatted: Default Paragraph Font
been explained.]
Formatted: Default Paragraph Font
Formatted: std_docPartNumber
3.108
type number
K
Formatted: Font: Bold
dimensionless quantity, defined by Formula (64):
1 1
2 2
′′
2πnQ ωQ
K (6)
33
( gH′′) 44( y)
1 1
Field Code Changed
2 2
2πnQ′′ωQ
K (4)
33
( gH′′) 44( y)
where
Formatted: Don't adjust space between Latin and Asian
text, Don't adjust space between Asian text and
3 3 numbers
 Q′ is volume flow rate per eye, expressed in m /s;is volume flow rate per eye, expressed in m /s;
 H′ is head of the first stage, expressed in m;
Formatted: Don't adjust space between Latin and Asian
text, Don't adjust space between Asian text and
-−1 -−1
 ω is expressed in time, like s , and n is expressed in 60 × × min form.
numbers
Note 1 to entry: The type number should be taken according to the maximum diameter of the first stage impeller.
Formatted: Don't adjust space between Latin and Asian
text, Don't adjust space between Asian text and
3.119
numbers
net positive suction head
NPSH Formatted: Font: Italic
pump inlet total head (3.5) above the head, equivalent to the vapour pressure per unit volume liquid, i.e.
Formatted: Font: Not Italic
pump inlet total head (3.5) adds head equivalent to atmospheric pressure and subtracts head
Formatted: Font: Not Italic
equivalent to the vapour pressure
Note 1 to entry: Net positive suction head is calculated by Formula (75):
pp−
Field Code Changed
bv
NPSH= H−+z (5)
1 D
ρ g
where
Formatted: Definition, Tab stops: Not at 19.85 pt +
39.7 pt + 59.55 pt + 79.4 pt + 99.25 pt + 119.05 pt +
p − p 138.9 pt + 158.75 pt + 178.6 pt + 198.45 pt
b v
NPSH= H− z+ (7)
1 D
ρ g
where
 p is (absolute) atmospheric pressure, expressed in Pa;
b
 is (absolute) vapour pressure, expressed in Pa;
p
v Formatted: Font: 11 pt
Formatted: Space Before: 0 pt, Line spacing: single
4 © ISO 2022 – All rights reserved
4 © ISO 2023 – All rights reserved

==
==

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ISO/FDIS 4679:2023(E)
Formatted: Right
 z is height of impeller inlet, expressed in m.
D
 is (absolute) atmospheric pressure, expressed in Pa;
p
b
 p is (absolute) vapour pressure, expressed in Pa;
v
 z is height of impeller inlet, expressed in m.
D
[SOURCE: ISO 17769-1:2012, 2.1.5.5], modified — definition has been modified; the symbols have been
modified and the notes 2, 3 and 4 to entry have been deleted.]
3.1210
guarantee point
operating performance of the pump which the supplier guarantees to be achieved under specified
conditions.
[SOURCE: ISO 17769-1:2012, 2.1.13.2], modified — note 1 to entry has been deleted.]
Formatted: Don't adjust space between Latin and Asian
text, Don't adjust space between Asian text and
numbers
4 Measurement and acceptance criteria
4.1 General
The basic parameters of the waterjet hydraulic performance tests directly obtained from the
measurement are flow rate, pressure, torque and speed of rotation. The derived parameters calculated
from the basic parameters are head, shaft power and efficiency. All of these parameters shall meet the
acceptance criteria specified in this clause.
Table 1 gives the acceptance level of pump head, flow rate, shaft power and efficiency. All acceptance
Formatted: cite_tbl
criteria are expressed as percentagepercentages of guarantee values. The test equipment shall meet the
Formatted: cite_tbl
measuring precision requirements. The measuring apparatus and their calibration should be confirmed.
Both the purchaser and manufacturer shall be entitled to have representatives present at all tests. The
timedate of the test shall be mutually agreed by the purchaser and manufacturer. Acceptance criteria
shall meet the requirements in Table 1 and if applicable, any agreements between the purchaser and
Formatted: cite_tbl
manufacturer.
Formatted: cite_tbl
Table 1 — Acceptance criteria for Class A and Class B
Class A Class B
Quantity

% %
Flow rate ±1,5 ±2,0
Formatted: Don't keep with next
Speed of rotation ±0,2 ±0,5
Formatted: Don't keep with next
Torque ±1 ±1,4
Formatted: Don't keep with next
Pump total head ±1 ±1,5
Formatted: Don't keep with next
Pump power input ±1 ±1,5
Formatted: Don't keep with next
Pump efficiency ±2,25 ±2,9
Formatted: Don't keep with next
A guarantee point may be detailed in a written contract, a customer-specific waterjet performance
Formatted Table
curve, or similar written and project specific documentation.
Formatted: Font: 11 pt
If not otherwise agreed upon between the purchaser and the manufacturer, the following should apply.
Formatted: Line spacing: single
© ISO 2022 – All rights reserved 5
© ISO 2023 – All rights reserved 5

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ISO/FDIS 4679:2023(E)
a) The acceptance grade should be in accordance with the grades given in Table 1.
b) Tests should be carried out on the test stand of the manufacturer’s works with clean, cold water,
using the methods and test arrangements specified in this document.
c) The waterjet performance should be guaranteed between the waterjet’s inlet connection and outlet
connection.
d) Pipe and fittings (bends, reducers, and valves) outside the waterjet are not a part of the guarantee.
The combination of manufacturing and measurement tolerances in practice necessitates the usage of
tolerances on tested values. The tolerances given in Table 1 take into account both manufacturing and
measurement tolerances.
The performance of a waterjet varies substantially with the nature of the liquid being pumped.
Although it is not possible to give general rules whereby performance withrequirements and guidelines
in which clean, cold water can be used to predict performance with other liquids, it is desirable for the
parties to agree on empirical rules to suit the particular circumstances (see ISO/TR 17766).
For batch products, the number of waterjets which are tested should be agreed between the purchaser
Formatted: Don't adjust space between Latin and Asian
and manufacturer. text, Don't adjust space between Asian text and
numbers
4.2 Measurement range
The flow rate is measured within the range fromof 80 % to 110 % of the best efficiency point or duty
point at identical speed of rotation.
The variation between the measured speed of rotation and specified speed of rotation should be
within ±20 % for Class A and the range from 60 % to 120 % for Class B.
4.3 SteadyStable operating conditions of measuring systems
The test should be carried out on the test stand which meets the corresponding precision grade. The
test stand may be the manufacturer’s test works, or a test stand mutually agreed between the purchaser
and the manufacturer. The precision grade of the test equipment is decided by the measuring system.
The flow rate, inlet and outlet pressure, speed of rotation, torque, which are naturally fluctuating when
measured in the tests, andas well as the signals, are automatically recorded or the statistical records
accumulate. The readings of delivered signals should satisfy the steadystable condition.
If the design or operation of the pump causes a large fluctuation in the measured value, a buffer device
may be installed in the measuring instrument or its connecting pipeline, to reduce the fluctuation to the
range given in Table 2 for measurement. Buffer devices should be symmetrical and linear, like
capillaries, which should provide integral values that contain at least one complete fluctuation period.
Table 2 — Permissible amplitude of fluctuation as a percentage of mean value of quantities
being measured
Formatted Table
Permissible amplitude of fluctuations
Formatted: Line spacing: single
Class A Class B
Measured quantity
Formatted: Line spacing: single

% % Formatted: Don't keep with next
Formatted: Don't keep with next
Flow rate ±2 ±3
Formatted: Font: 11 pt
Differential head ±3 ±4
Formatted: Space Before: 0 pt, Line spacing: single
6 © ISO 2022 – All rights reserved
6 © ISO 2023 – All rights reserved

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ISO/FDIS 4679:2023(E)
Formatted: Right
Pressure ±2 ±3
Formatted: Don't keep with next
Pump pow
...