Automatic steam traps — Production and performance characteristic tests

Purgeurs automatiques de vapeur d'eau — Essais de production et essais des caractéristiques de fonctionnement

General Information

Status

Not Published

ICS

23.060.01 - Valves in general

Technical Committee

ISO/TC 153 - Valves

Drafting Committee

ISO/TC 153 - Valves

Current Stage

6000 - International Standard under publication

Completion Date

02-May-2023

Ref Project

Relations

Revises

ISO 6948:1981 - Automatic steam traps — Production and performance characteristic tests

Effective Date

06-Jun-2022

Revises

ISO 7841:1988 - Automatic steam traps — Determination of steam loss — Test methods

Effective Date

06-Jun-2022

Revises

ISO 7842:1988 - Automatic steam traps — Determination of discharge capacity — Test methods

Effective Date

06-Jun-2022

Consolidates

ISO/IEC 14776-481:2019 - Information technology — Small computer system interface (SCSI) — Part 481: Part 481:Security Features for SCSI Commands (SFSC)

Effective Date

06-Jun-2022

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REDLINE ISO/FDIS 5117 - Automatic steam traps — Production and performance characteristic tests
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REDLINE ISO/FDIS 5117 - Automatic steam traps — Production and performance characteristic tests Released:20. 02. 2023

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ISO/FDIS 5117 - Automatic steam traps — Production and performance characteristic tests
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Standards Content (Sample)

2023-01-0302
ISO/FDIS 5117:2023(E)
ISO TC 153/WG 15
Secretariat: AFNOR
Automatic steam traps — Production and performance characteristic tests

Purgeurs automatiques de vapeur d'eau — Essais de production et essais des caractéristiques de

fonctionnement
---------------------- Page: 1 ----------------------
ISO/FDIS 5117:2023(E)
© ISO 2023

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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2023 – All rights reserved
ii © ISO 2023– All rights reserved
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ISO/FDIS 5117:2023(E)
Contents

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

Introduction.................................................................................................................................................................... vi

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

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

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

4 Test methods ..................................................................................................................................................... 2

4.1 Production test — Shell testing .................................................................................................................. 2

4.2 Performance characteristic tests ............................................................................................................... 3

4.2.1 Operational check ........................................................................................................................................... 3

4.2.2 Minimum operating pressure ..................................................................................................................... 3

4.2.3 Maximum operating pressure (PMO) ...................................................................................................... 3

4.2.4 Maximum operating back pressure (PMOB) ......................................................................................... 3

4.2.5 Air venting capability ..................................................................................................................................... 3

4.2.6 Operating temperature (TO) ....................................................................................................................... 3

4.2.7 Condensate capacity (QH or QC) ................................................................................................................ 3

4.2.8 Live steam loss .................................................................................................................................................. 3

4.2.9 Determination of minimum operating pressure ................................................................................. 4

4.2.10 Determination of maximum operating pressure ................................................................................. 4

4.2.11 Determination of maximum operating back pressure ...................................................................... 4

4.2.12 Determination of air venting capability .................................................................................................. 4

4.2.13 Determination of operating temperature .............................................................................................. 4

4.2.14 Determination of condensate capacity .................................................................................................... 4

4.2.15 Determination of live steam loss ............................................................................................................... 5

5 Inspection ........................................................................................................................................................... 5

Annex A (normative) Test methods for the determination of discharge capacity ................................ 6

Annex B (normative) Test methods for the determination of steam loss ............................................. 22

Bibliography ................................................................................................................................................................. 37

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ISO/FDIS 5117:2023(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/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 153, Valves, in collaboration with the

European Committee for Standardization (CEN) Technical Committee CEN/TC 69, Industrial valves, in

accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This first edition cancels and replaces ISO 6948:1981, ISO 7841:1988 and ISO 7842:1988, which have

been technically revised.
The main changes are as follows:
— merging of ISO 6948:1981, ISO 7841:1988 and ISO 7842:1988;
— update of the technical content according to state-of-the-art;
— addition of the definition 3.2terminological entry on subcooling; (3.2);

— addition of a data sheet for test methods A and B on steam trap discharge capacity in A.3.3 and in

A.4.3;
— addition of a computation formula [Formula (B.4)];

— addition of a data sheet for test methods A and B on steam loss test in B.3.4 and B.4.4.

© ISO 2023 – All rights reserved
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ISO/FDIS 5117:2023(E)

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.
© ISO 2023 – All rights reserved © ISO 2023 – All v
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ISO/FDIS 5117:2023(E)
Introduction

Testing of steam traps provides conformance of product performance to the intended function. This

document addresses the requirements for production testing and performance testing of steam traps.

Production test ensures the shell integrity to the maximum working pressure while the performance test

ensures the functional requirement of steam traps. Performance test should be considered as type test.

Testing is the most reliable method to validate a product including design, material selection and

manufacturing processes. It may also serve as a guide for steam traps selection. It can allow the users to

compare different types of steam traps, designs and brands.

Currently the test requirements are mostly driven by the manufacturer or the users and each may have

their own specification. This document will create common understanding on the qualifications, and end-

user total cost-of-ownership by eliminating unintentional design flaws and planned obsolescence.

Ultimately, this document will improve performance and safety in the plants by enabling any customer

to specify durable type-tested industrial valves.
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 5117:2023(E)
Automatic steam traps — Production and performance
characteristic tests
1 Scope

This document specifies the production and performance relevant test requirements for automatic

steam traps used for condensate removal/recovery services for optimized utilization of energy, in

refinery, power generation or other general applications where steam is used as a medium of heat

transfer.

The tests can be classified as production tests and performance characteristic tests and can be

conducted to ensure the correct functioning of a steam trap or to evaluate the performance of a

particular design. This document specifies the tests performed relative to each one of these two

categories and briefly describes the corresponding test methods.
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 6553, Automatic steam traps — Marking
3 Terms and definitions
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
production test

tests carried out by the manufacturer to confirm that each automatic steam trap functions correctly

Note 1 to entry: These tests may be witnessed by the purchaser or his representative. In this case, these tests are

referred to as acceptance tests.
3.2
subcooling

temperature-related phenomenon which is the difference between the steam saturation temperature to

the actual temperature of steam/condensate either at steam trap inlet or exit

Note 1 to entry: This may be the accountable parameter in some of the steam trap type like thermostatic steam

traps.
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ISO/FDIS 5117:2023(E)

Note 2 to entry: The water with a temperature value below the saturation temperature is called the subcooled

condensate. But also, the saturation temperature always corresponds to the pressure at which the system is

operating.
4 Test methods
4.1 Production test — Shell testing

Each steam trap shall be tested to confirm the integrity of its shell under pressure.

The test fluid, the choice of which is left to the discretion of the manufacturer, shall be either:

— water, which may contain a corrosion inhibitor, kerosene or any other suitable liquid having a

viscosity not greater than that of water;
— steam, air, or any other suitable gas.

NOTE Various statutory authorities require specific approval of test procedures where the test is conducted

using steam, air, or other gas.

Any internal trim which does not withstand the test pressure may be removed before the test.

The steam trap shall be essentially vented off air when testing with a liquid.

Steam traps shall not be painted or otherwise coated with materials capable of sealing against leakage

before the shell pressure tests are completed. Chemical corrosion protection treatments and internal

linings are permitted. If pressure tests in the presence of a representative of the purchaser are specified,

painted steam traps from stock may be re-tested without removal of paint.

Test equipment shall not subject the steam trap to externally applied stresses which can affect the

results of the tests.

The shell test shall be performed by applying pressure inside the assembled steam trap with the ends

closed.

For all steam traps, the hydraulic shell test shall be performed at a pressure 1,5 times the maximum

allowable pressure at 20 °C.

For steam traps with a nominal diameter less than or equal to DN 50 and with pressure range up to

PN 40 or Class 300, a hydraulic shell test can be performed using gas at a pressure (gauge pressure) of

6 bar (0,6 MPa). For gas test, safety measuremeasures shall be taken.

Visually detectable leakage through the pressure retaining walls is not acceptable.

Test durations shall not be less than those specified in Table 1.
Table 1 — Minimum durations for shell tests
Nominal steam trap size Minimum test duration
DN [s]
DN ≤ 50 15
65 < DN < 200 60
180
250 ≤ DN
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ISO/FDIS 5117:2023(E)
4.2 Performance characteristic tests
4.2.1 Operational check

The operational performance of the steam trap shall be checked under the steam and condensate. The

test set up shall ably produce the steam and condensate in the desired condition. Steam shall be fed into

the steam trap. Condensate shall be introduced intermittently if required.

When only steam is present, the steam trap shall close. When the steam becomes condensate, the steam

trap shall open (the time taken will vary as a function of the steam trap type); when the condensate has

been discharged, the steam trap shall again close. The test is complete when at least one complete cycle

has been performed. The condensate can also be fed to the steam trap to quicken the cycle and to verify

the performance.
Certain types of steam trap may be tested with air or water.

A manufacturer may describe the operations of a particular type of steam trap by referring to one or

more of the following performance characteristic tests. A brief explanation of the derivation of each

characteristic is given below.

The performance test may be considered on sample basis as type test based on the type of steam traps.

Sample steam traps shall be tested to ensure that they open to discharge condensate and close

satisfactorily. Further details are given in 4.32.2 to 4.32.15. This test does not apply to the labyrinth (or

orifice) steam traps (see ISO 6704).
4.2.2 Minimum operating pressure

The steam trap shall be tested to determine the minimum pressure (atmospheric or above) at which the

correct opening, and closing will occur.
4.2.3 Maximum operating pressure (PMO)

The steam trap shall be tested to determine the maximum pressure at which the correct opening, and

closing will occur.
4.2.4 Maximum operating back pressure (PMOB)

The steam trap shall be tested to determine the maximum pressure permissible at the outlet of the

device which allows correct functioning.
4.2.5 Air venting capability
The steam trap shall be tested to determine its ability to discharge air.
4.2.6 Operating temperature (TO)

The steam trap shall be tested to determine the temperature at which the device operates and in

particular the temperature at which it passes its specified capacity.
4.2.7 Condensate capacity (QH or QC)

The steam trap shall be flow tested to determine its condensate capacity throughout its operating

pressure range.
4.2.8 Live steam loss

The steam trap shall be tested to determine the amount of live steam lost via the steam trap.

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ISO/FDIS 5117:2023(E)
4.2.9 Determination of minimum operating pressure

Operational checks, as described in 4.32.1, shall be carried out while successively reducing the test

pressure until the steam trap fails to open and close correctly.

The minimum operating pressure is the lowest test pressure at which correct operation is observed.

4.2.10 Determination of maximum operating pressure

The maximum operating pressure of the steam trap may be verified by carrying out operational checks,

as described in 4.32.1, while successively increasing the test pressure up to the steam trap's maximum

operating pressure.
The steam trap shall open and close correctly throughout the test.
4.2.11 Determination of maximum operating back pressure

Operational checks, as described in 4.32.1, shall be carried out with the outlet from the steam trap

connected to a vessel in which the pressure can be raised, independent of the test pressure upstream of

the steam trap. While maintaining a reference pressure at the steam trap's inlet, the pressure at its outlet

is to be raised successively until the steam trap fails to open and close correctly.

The maximum operating back pressure is the highest pressure applied to the steam trap's outlet at

which correct operation is still observed.
4.2.12 Determination of air venting capability

Air shall be introduced at a specified temperature into the steam trap or upstream piping. The air

venting capability shall be checked by an air flow measurement carried out at minimum and maximum

operating pressures, the temperature inside the steam trap being recorded.
4.2.13 Determination of operating temperature

Steam shall be fed into the steam trap to effect closure. Condensate, at saturated steam temperature,

shall then be introduced and, unless the steam trap opens immediately, shall be allowed to cool slowly

at the steam trap's inlet.

The temperature of the condensate, measured at the steam trap's inlet, at which the device opens, is the

operating temperature.

The operating temperatures are the temperatures of the condensate, measured at the inlet to the steam

trap, at which the steam trap passes its specified capacities.
4.2.14 Determination of condensate capacity

The capacity of the steam trap shall be determined by measuring the amount of condensate that is

discharged from the device under specified conditions of pressure differential and condensate

temperature.

The test shall be carried out with condensate at different temperatures and at different pressures within

the steam trap's operating range to be specified, according to the test requirements detailed in Annex A.

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ISO/FDIS 5117:2023(E)
4.2.15 Determination of live steam loss

To determine the amount of live steam lost, if any, by the steam trap, use one of the test methods in

Annex B.
5 Inspection

Samples of the finished steam traps shall be visually examined and dimensionally checked to ensure that

the steam traps correspond to the stated specification and shall be marked in accordance with ISO 6553.

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ISO/FDIS 5117:2023(E)
Annex A
(normative)
Test methods for the determination of discharge capacity
A.1 General

This annex specifies two test methods to determine the discharge capacity of automatic steam traps.

A.2 Test arrangements

The test arrangements for condensate capacity determination are shown in Figures A.1 and A.2.

To reduce thermal losses to a minimum, all piping and equipment shall be insulated to a value R, in

2 −1
m⋅°C⋅h⋅J , according to Formula (A.1).
R ≥×0,75 10 (A.1)

The instruments used for the measurements shall comply with International Standards, for example,

ISO 4185, the ISO 5167 (series) and ISO 5168 for flow measurements.

The condensate removal device shall not be modified in any way from its commercial form.

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ISO/FDIS 5117:2023(E)
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ISO/FDIS 5117:2023(E)
Key
A water supply L test device
B flow meter q M water-cooled condenser
C steam water mixer N scale
D flow meter qm2 V1 valve 1
E calorimeter V2 valve 2
F steam supply V3 valve 3
G steam vent V4 valve 4
H flash tank accumulator V5 valve 5
I temperature difference indicator Δθ AA arrangement A
J gate or full bore valve V4 BB arrangement B
K drain

NOTE 1 The diameter of the pipework from the accumulator to the condensate removal device is the same as, or

greater than, the diameter of the pipework to the inlet connection on the device.

NOTE 2 The distance L does not exceed 10 internal pipe diameters.

NOTE 3 The distance L2 is not less than 10 and not more than 20 internal pipe diameters.

NOTE 4 The distance L is measured vertically from the water level to the centre of the inlet connection of the

test device.
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ISO/FDIS 5117:2023(E)
Figure A.1 — Test arrangement for test method A
Key
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ISO/FDIS 5117:2023(E)
A vent N test device
B safety valve O slope
C pressure reducing valve P vacuum breaker
D steam supply L distance between sensors and test device
E circulator R open pit
F calibrated scale V1 valve 1
G temperature controller (optional) V2 valve 2
H scale V3 valve 3 – temperature control
I injector line V4 valve 4
K accumulator V5 valve 5 – gate or full bore ball valve
L gauge glass V6 valve 6 – gate or full bore ball valve
M cold water V7 valve 7

NOTE 1 The piping from the accumulator to the test device is of the same diameter as the inlet connection on the

test device. This inlet to the piping from the accumulator is well rounded.

NOTE 2 The distance L1 between the sensors and the test device does not exceed 20 internal pipe diameters.

NOTE 3 The distance L is measured vertically from the centre of the inlet pipe connection of the test device and

does not exceed 450 mm.

NOTE 4 In Figure A.2, a steam injector is used for heating the water in the accumulator. It is also possible to use

a steam circulating coil inside the accumulator or any other means.

Figure A.2 — Test arrangement for test method B – Continuous and intermittent flow

A.3 Test method A
A.3.1 Procedure
The method A is applicable only to continuous discharge measurement.

It is emphasized that Figure A.1 shows two alternative test arrangements for condensate measurement

and that the choice is left to the test laboratory.
Start with all valves closed.
a) Warm up the system by gradually opening valves V1, V2, V3, V4 and V5.

b) Adjust valves V1, V2 and V3 with valve V4 wide open and valve V5 closed to bring the system into

equilibrium. Equilibrium is defined as a steady water level in the accumulator with the vent valve V3

partially open and a difference of 3 °C or less showing on the temperature differential indicator.

c) Observe and record the following data as appropriate depending on the method of condensate

determination:
p1 = steam supply pressure, in bar(g) or MPa(g);
p = accumulator steam pressure, in bar(g) or MPa(g);
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ISO/FDIS 5117:2023(E)
p = steam trap inlet pressure, in bar(g) or MPa(g);
p4 = steam trap outlet pressure, in bar(g) or MPa(g);
θ = steam supply temperature, in °C;
θ2 = water supply temperature, in °C;

Δθ = temperature differential (subcooling) between steam in the accumulator and fluid entering the

steam trap, in °C;
X = steam supply quality, in %;
L = accumulator water level, in m;
Δt = time interval, in h, min or s;
q = water supply flow rate, in kg/h;
q = steam supply flow rate, in kg/h;
m = mass of condensate and tank at the start, in kg;
m = mass of condensate and tank at the end, in kg.

d) Record the data specified in A.3.1 c) at 5 min intervals for a minimum total of five sets of

observations.

e) During the test period observations as appropriate shall not exceed the following limits:

— the difference between the maximum and minimum tank level shall not exceed 50 mm;

— the maximum value of the tank level shall not exceed 450 mm at any time during the test;

— the maximum temperature differential (Δθ) shall not exceed 3 °C during the test;

— no individual steam trap inlet pressure (p ) observation shall vary by more than 1 % of the

average of all observations;

— the calculated vent steam flow rate (q ) shall not exceed a maximum value equal to an exit

velocity of 0,31 m/s in the tank.

f) Repeat the operations specified in A.3.1 a) to e), as necessary to produce three sets of observations

which result in three calculated capacity ratings, none of which varies from the average by more

than 10 %.
A.3.2 Flow calculations
Flow shall be calculated according to Formulae (A.2) to (A.7).
qmf = (qm1 + qm3 - qm4) ± qm8 (A.2)
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ISO/FDIS 5117:2023(E)
(mm− )
c2 c1
q ×3600 (A.3)
where
qmf is the discharge flow rate, in kg/h;
q is the water flow rate, in kg/h;
q is the steam flow rate to heat water supply (q ), in kg/h.
m3 m1
q is the flash steam flow rate in the accumulator, in kg/h;
m mass of condensate and tank at the start, in kg;
m mass of condensate and tank at the end, in kg;
Δt is the time interval, in s.
(hh− )
3 1
qq × (A.4)
m3 m1
(hh− )
2 3
(hh− )
3 5
(A.5)
q = (q +×q )
m4 m1 m3
(hh− )
4 5
π D
q × ×0,31× 3 600 (A.6)
m4,max
4 V
π (LL− ) 3600
2 31 32
qD=×× × (A.7)
4 ∆tV
where
q q is the flash steam flow rate in the accumulator storage rate, in kg/h.;
(A.5)
3 600 (A.6)
( )
𝜋𝜋 𝐿𝐿 −𝐿𝐿 3 600
2 31 32
𝑞𝑞 = ×𝐷𝐷 × × (A.7)
𝑚𝑚8
4 𝛥𝛥𝛥𝛥 𝑉𝑉
where
q is the accumulator storage rate, in kg/h;
m is the mass of condensate and tank at the start, in kg;
m is the mass of condensate and tank at the end, in kg;
h is the specific enthalpy of the supply water, in kJ/kg;
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ISO/FDIS 5117:2023(E)
h is the specific enthalpy of the supply steam, in kJ/kg;

h is the specific enthalpy of saturated water at the supply pressure, in kJ/kg;

h is the specific enthalpy of saturated steam in the accumulator, in kJ/kg;
h is the specific enthalpy of saturated water in the accumulator, in kJ/kg;
V is the specific volume of saturated steam in the accumulator, in m /kg;
V is the specific volume of saturated water in the accumulator, in m /kg;
Δt is the time interval, in s;
D is the inside diameter of the accumulator, in m;
L is the initial accumulator tank level, in m;
L is the final accumulator tank level, in m.
A.3.3 Datasheet
Table A.1 provides an example of a datasheet for method A.
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ISO/FDIS 5117:2023(E)
Table A.1 — Example of a datasheet — Test method A
Steam trap discharge capacity - Test method A
Test n°: Date of test: Calculation by: Manufacturer name:

Serial n°: Size: Description and type of device: Test n°: Date of test:Calculation

Inserted Cells
by:Manufacturer name:
Inserted Cells
Serial n°: Size: Description and type of device: Inside diameter of
accumulator, D:
Inserted Cells
Data
Data Calculation
Run numbers
average
Item Unit Item Unit

Steam supply pressure, p bar or MPa Reference used for steam/water data

Accumulator steam pressure, p 2 bar or MPa Specific enthalpy of water supply, h 1 kJ/kg

Steam trap inlet pressure, p 3 bar or MPa Specific enthalpy of steam supply, h 2 kJ/kg

Steam trap outlet pressure, p 4 bar or MPa Specific enthalpy of saturated water at steam kJ/kg

supply pressure, h 3
Steam supply temperature, θ 1 °C Specifi
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 5117
ISO/TC 153
Automatic steam traps — Production
Secretariat: AFNOR
and performance characteristic tests
Voting begins on:
2023-03-06
Purgeurs automatiques de vapeur d'eau — Essais de production et
essais des caractéristiques de fonctionnement
Voting terminates on:
2023-05-01
ISO/CEN PARALLEL PROCESSING
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BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 5117:2023(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 5117:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 5117
ISO/TC 153
Automatic steam traps — Production
Secretariat: AFNOR
and performance characteristic tests
Voting begins on:
Purgeurs automatiques de vapeur d'eau — Essais de production et
essais des caractéristiques de fonctionnement
Voting terminates on:
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BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
ISO/FDIS 5117:2023(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
© ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023
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ISO/FDIS 5117:2023(E)
Contents Page

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

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

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

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

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

4 Test methods ............................................................................................................................................................................................................ 2

4.1 Production test — Shell testing .............................................................................................................................................. 2

4.2 Performance characteristic tests ........................................................................................................................................... 2

4.2.1 Operational check .............................................................................................................................................................. 2

4.2.2 Minimum operating pressure ................................................................................................................................. 3

4.2.3 Maximum operating pressure (PMO) .............................................................................................................. 3

4.2.4 Maximum operating back pressure (PMOB) ............................................................................................. 3

4.2.5 Air venting capability ..................................................................................................................................................... 3

4.2.6 Operating temperature (TO) ................................................................................................................................... 3

4.2.7 Condensate capacity (QH or QC) .......................................................................................................................... 3

4.2.8 Live steam loss ..................................................................................................................................................................... 3

4.2.9 Determination of minimum operating pressure ................................................................................... 3

4.2.10 Determination of maximum operating pressure .................................................................................. 4

4.2.11 Determination of maximum operating back pressure ..................................................................... 4

4.2.12 Determination of air venting capability ........................................................................................................ 4

4.2.13 Determination of operating temperature .................................................................................................... 4

4.2.14 Determination of condensate capacity ........................................................................................................... 4

4.2.15 Determination of live steam loss ......................................................................................................................... 4

5 Inspection .................................................................................................................................................................................................................... 4

Annex A (normative) Test methods for the determination of discharge capacity .............................................5

Annex B (normative) Test methods for the determination of steam loss .................................................................19

Bibliography .............................................................................................................................................................................................................................31

iii
© ISO 2023 – All rights reserved
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ISO/FDIS 5117:2023(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 153, Valves, in collaboration with the

European Committee for Standardization (CEN) Technical Committee CEN/TC 69, Industrial valves, in

accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This first edition cancels and replaces ISO 6948:1981, ISO 7841:1988 and ISO 7842:1988, which have

been technically revised.
The main changes are as follows:
— merging of ISO 6948:1981, ISO 7841:1988 and ISO 7842:1988;
— update of the technical content according to stateoftheart;
— addition of the terminological entry on subcooling (3.2);

— addition of a data sheet for test methods A and B on steam trap discharge capacity in A.3.3 and in

A.4.3;
— addition of a computation formula [Formula (B.4)];

— addition of a data sheet for test methods A and B on steam loss test in B.3.4 and B.4.4.

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.
© ISO 2023 – All rights reserved
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ISO/FDIS 5117:2023(E)
Introduction

Testing of steam traps provides conformance of product performance to the intended function. This

document addresses the requirements for production testing and performance testing of steam traps.

Production test ensures the shell integrity to the maximum working pressure while the performance

test ensures the functional requirement of steam traps. Performance test should be considered as type

test.

Testing is the most reliable method to validate a product including design, material selection and

manufacturing processes. It may also serve as a guide for steam traps selection. It can allow the users

to compare different types of steam traps, designs and brands.

Currently the test requirements are mostly driven by the manufacturer or the users and each may have

their own specification. This document will create common understanding on the qualifications, and

end-user total cost-of-ownership by eliminating unintentional design flaws and planned obsolescence.

Ultimately, this document will improve performance and safety in the plants by enabling any customer

to specify durable type-tested industrial valves.
© ISO 2023 – All rights reserved
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 5117:2023(E)
Automatic steam traps — Production and performance
characteristic tests
1 Scope