ISO/DIS 23840

Water hydraulics -- Water-hydraulic pumps -- Methods of testing and representing basic steady-state performance

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DRAFT INTERNATIONAL STANDARD
ISO/DIS 23840
ISO/TC 131/SC 8 Secretariat: BSI
Voting begins on: Voting terminates on:
2021-01-18 2021-04-12
Water hydraulics — Water-hydraulic pumps — Methods of
testing and representing basic steady-state performance
ICS: 23.100.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
This document is circulated as received from the committee secretariat.
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STANDARDS MAY ON OCCASION HAVE TO
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WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 23840:2021(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
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PROVIDE SUPPORTING DOCUMENTATION. ISO 2021
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ISO/DIS 23840:2021(E)
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© ISO 2021

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ii © ISO 2021 – All rights reserved
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ISO/DIS 23840:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols and units ............................................................................................................................................................................................... 4

5 Water ................................................................................................................................................................................................................................ 4

6 Tests ................................................................................................................................................................................................................................... 4

6.1 Requirement ............................................................................................................................................................................................. 4

6.1.1 General...................................................................................................................................................................................... 4

6.1.2 Installation of the unit under test ..................................................................................................................... 5

6.1.3 Test fluid .................................................................................................................................................................................. 5

6.1.4 Temperature ........................................................................................................................................................................ 5

6.2 Test circuit ................................................................................................................................................................................................... 5

6.3 Test measurement ................................................................................................................................................................................ 6

6.4 Preparation of test ............................................................................................................................................................................... 6

6.5 Measurement procedure ................................................................................................................................................................ 7

7 Expression of results ........................................................................................................................................................................................ 7

Annex A (normative) Errors and classes of measurement accuracy .................................................................................. 9

Annex B (normative) Permissible variation of mean indicated values of controlled parameters ...11

Annex C (informative) Example of graphs presenting test results .....................................................................................12

Bibliography .............................................................................................................................................................................................................................16

© ISO 2021 – All rights reserved iii
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ISO/DIS 23840:2021(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/ 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 on 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 the following

URL: www .iso .org/ iso/ foreword .html.

This document was prepared by Technical Committee TC 131 (Fluid Power Systems), Sub-Technical

Committee SC 8 (Product testing), Working Group WG 14 (Testing of water hydraulic pumps).

iv © ISO 2021 – All rights reserved
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ISO/DIS 23840:2021(E)
Introduction

Water hydraulics or water-hydraulic systems, hydraulic systems in which water has been used as the

power transmitting medium in a fluid power system, have potential market demand in favour of easily-

keeping cleanness, reducing the fluid cost and the machine size, and less fire risk. Applications of water

hydraulics have been expanding to new fields requiring cleanness, in particular, the fields of cleaning,

animals and plants, food, packaging, cosmetics, semiconductor, and others, thanks to the environmental

cleanliness of water compared with alternative hydraulic fluids, such as oil.

There are no international standards specialized in water hydraulics though the water hydraulics is

generally known. Since the technology of water hydraulics is one of emerging technologies, this kind of

technology should be standardized in the collaboration within related countries including developing

countries as well as developed ones in the stage of international standardization, particularly in the

ISO/TC 131 (Fluid power systems), to accelerate the development of this technology.

The water-hydraulic pump is essentially one of the key components of water hydraulics. Developing

an appropriate standard for water-hydraulic pumps, indeed methods of testing and representing basic

steady-state performance, as the first standard, is therefore critical to business trade and/or product

acceptance by consumers.

Japan, as a P-member of ISO/TC 131, re-proposes a new international standard for water hydraulics.

This is a completely-newly-revised draft of the international standard titled “Water hydraulics – Water-

hydraulic pumps – Methods of testing and representing basic steady-state performance.”-

© ISO 2021 – All rights reserved v
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DRAFT INTERNATIONAL STANDARD ISO/DIS 23840:2021(E)
Water hydraulics — Water-hydraulic pumps — Methods of
testing and representing basic steady-state performance
1 Scope

This document specifies methods for determining the performance and the efficiency of water-

hydraulic positive displacement pumps having continuously rotating shafts. This standard provides

test equipment, test procedure under steady-state conditions and the presentation of test results.

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 4391, Hydraulic fluid power — Pumps, motors and integral transmissions — Parameter definitions and

letter symbols
ISO 5598, Fluid power systems and components — Vocabulary

ISO 8426, Hydraulic fluid power — Positive displacement pumps and motors — Determination of derived

capacity
ISO 16345, Water-cooling towers — Testing and rating of thermal performance
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4391 and ISO 5598 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
3.1
water-hydraulic pump

positive displacement pump that transforms mechanical energy into water-hydraulic energy with

water as the system fluid
3.2
hydraulic pump
(hydraulic) component that transforms mechanical energy into hydraulic energy
[SOURCE: ISO 5598:2020, 3.2.370]
3.3
fluid

fluid power medium, liquid or gas, used as the power transmitting medium in a fluid power system

[SOURCE: ISO 5598:2020, 3.2.316, modified – “liquid or gas” was replaced by “, liquid or gas,”]

© ISO 2021 – All rights reserved 1
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ISO/DIS 23840:2021(E)
3.4
steady-state
state in which a physical parameter does not vary appreciably with time

[SOURCE: ISO 5598:2020, 3.2.725, modified – “steady state” was replaced by “steady-state”]

3.5
steady-state operating conditions

operating conditions in which relevant parameters are in steady-state after a period of stabilization

[SOURCE: ISO 5598:2020, 3.2.726, modified – “steady state” was replaced by “steady-state”]

3.6
shaft speed, n
rotational speed of drive shaft of pump
3.7
flow rate

volume of fluid flow, at specified conditions, that crosses the transverse plane of a flow path per

unit of time
[SOURCE: ISO 5598:2020, 3.2.303]
3.8
flow rate of the pump under test, q
flow rate measured at the outlet port of the pump under test
3.9
derived capacity, V

volume of fluid displaced by a pump or motor per shaft revolution, calculated from measurements at

different outlet pressures (for pumps) or inlet pressures (for motors) under specified test conditions

[SOURCE: ISO 8426:1998, 3.3]
3.10
effective torque, T
usable torque at the shaft end, under specified conditions
[SOURCE: ISO 5598:2020, 3.2.248]
Note 1 to entry: This definition is used for a motor.
3.11
effective torque, T
torque necessary for driving the pump shaft, under specified conditions

Note 1 to entry: This definition is used for a pump. In this document, only this definition for a pump is used.

3.12
gauge pressure, p
measured absolute pressure minus atmospheric pressure
[SOURCE: ISO 5598:2020, 3.2.346]

Note 1 to entry: The value of “gauge pressure” shows either positive or negative.

2 © ISO 2021 – All rights reserved
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ISO/DIS 23840:2021(E)
3.13
pump overall efficiency, η

ratio of the power transferred to the liquid, at its passage through the pump, to the mechanical

input power
qp −p
ve,,oe i
η =
2πnT
[SOURCE: ISO 5598:2020, 3.2.603]
3.14
pump volumetric efficiency, η
ratio of the effective output flow rate to the derived output flow rate
η =
[SOURCE: ISO 5598:2020, 3.2.605, modified – symbols were replaced by the above]
3.15
hydromechanical pump efficiency, η
ratio of the derived torque to the effective torque
Vp −p
ie,,oe i
η =
2πT

[SOURCE: ISO 5598: 2020, 3.2.378, modified – “ratio of the derived displacement” was replaced by “ratio

of the derived torque”]
3.16
inlet gauge pressure of pump under test, p
ei,
measured gauge pressure at or near the suction port of a pump under test

Note 1 to entry: The value of “inlet gauge pressure of pump under test” shows either positive or negative.

3.17
outlet gauge pressure of pump under test, p
eo,
measured gauge pressure at or near the delivery port of a pump under test
3.18
free air

(hydraulic) any compressible gas, air or vapour trapped within a hydraulic system that does not

condense, emulsify or dissolve
[SOURCE: ISO 5598:2020, 3.2.335]
3.19
tap water
water supplied through pipes or tubes to taps/faucets
3.20
total dissolved solids (TDS)
weight of inorganic and organic matter in true solution per unit volume of water
[SOURCE: ISO 16345:2014]
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ISO/DIS 23840:2021(E)
4 Symbols and units

For the purposes of this document, the symbols and units listed in Table 1 apply. In Table 1, as the unit

3 -1 3
of Derived capacity and
...