Ships and marine technology -- Maritime safety -- Gas inflation systems for inflatable life-saving appliances

This document specifies performance and testing requirements for gas inflation systems for inflatable life-saving appliances. NOTE It is suitable for inflatable life-saving appliances complying with the requirements of the 1974 Safety of Life at Sea Convention (SOLAS 74), as amended, and the IMO International Life-Saving Appliance Code (LSA Code) as amended, adopted by IMO Resolution MSC.48(66). This document applies to gas inflation systems which consist of an inflation gas, a gas cylinder valve, a gas cylinder operating head, high-pressure hoses, and pressure-relief/transfer, inflate/deflate and non-return valves. This document addresses only systems in which compressed inflation gas in cylinders is used as the inflation medium. National requirements for qualification, use, and testing of gas cylinders vary widely. Such requirements for gas cylinders are not addressed in this document, but it is presupposed that gas cylinders meet the requirements of the applicable regulatory bodies. The systems addressed in this document are of the type generally used in life-saving appliances, such as survival craft, marine evacuation systems, and means of rescue. Systems used in personal life-saving appliances, such as inflatable lifejackets, are addressed in ISO 12402-7.

Navires et technologie maritime -- Sécurité maritime -- Systèmes de gonflage au gaz pour dispositifs de sauvetage gonflables

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Status
Published
Publication Date
11-Jul-2019
Current Stage
6060 - International Standard published
Start Date
15-Jun-2019
Completion Date
12-Jul-2019
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INTERNATIONAL ISO
STANDARD 15738
Second edition
2019-07
Ships and marine technology —
Maritime safety — Gas inflation
systems for inflatable life-saving
appliances
Navires et technologie maritime — Sécurité maritime — Systèmes de
gonflage au gaz pour dispositifs de sauvetage gonflables
Reference number
ISO 15738:2019(E)
ISO 2019
---------------------- Page: 1 ----------------------
ISO 15738:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

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.
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Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 15738:2019(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

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

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

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

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

4 Gas cylinder — Salt water exposure test ..................................................................................................................................... 2

5 Inflation gas ............................................................................................................................................................................................................... 2

5.1 Type and quantity ................................................................................................................................................................................ 2

5.2 Dryness .......................................................................................................................................................................................................... 2

6 Gas cylinder valve and operating head.......................................................................................................................................... 2

6.1 General ........................................................................................................................................................................................................... 2

6.2 Gas cylinder valve ................................................................................................................................................................................. 2

6.2.1 General...................................................................................................................................................................................... 2

6.2.2 Testing ....................................................................................................................................................................................... 3

6.3 Gas cylinder operating head ........................................................................................................................................................ 5

6.3.1 General...................................................................................................................................................................................... 5

6.3.2 Testing ....................................................................................................................................................................................... 5

7 High-pressure hose assembly ................................................................................................................................................................. 6

7.1 General ........................................................................................................................................................................................................... 6

7.2 Testing ............................................................................................................................................................................................................ 7

7.2.1 Pressure test ........................................................................................................................................................................ 7

7.2.2 Cold pressure test ........................................................................................................................................................... 7

7.2.3 Salt water exposure test ............................................................................................................................................ 7

7.2.4 Hydraulic pressure test .............................................................................................................................................. 7

7.2.5 Cold bend test ..................................................................................................................................................................... 7

7.2.6 Joint-securing test ........................................................................................................................................................... 8

7.2.7 Flow test .................................................................................................................................................................................. 8

8 Valves — Pressure-relief/transfer, inflate/deflate, non-return .......................................................................... 8

8.1 Pressure-relief/transfer valve ................................................................................................................................................... 8

8.1.1 Torque test ............................................................................................................................................................................ 8

8.1.2 Valve thread strength test ........................................................................................................................................ 8

8.1.3 Plug test ................................................................................................................................................................................... 8

8.1.4 Salt water exposure test ............................................................................................................................................ 8

8.1.5 Pressure test ........................................................................................................................................................................ 9

8.1.6 Drop test .................................................................................................................................................................................. 9

8.1.7 Valve securing test (where applicable)......................................................................................................... 9

8.1.8 Pulsating load test .......................................................................................................................................................... 9

8.1.9 Overpressure test ............................................................................................................................................................ 9

8.1.10 Flow test .................................................................................................................................................................................. 9

8.2 Inflate/deflate valve.........................................................................................................................................................................10

8.2.1 Torque test .........................................................................................................................................................................10

8.2.2 Valve thread strength test .....................................................................................................................................10

8.2.3 Plug test ................................................................................................................................................................................10

8.2.4 Salt water exposure test .........................................................................................................................................10

8.2.5 Leak test ...............................................................................................................................................................................10

8.2.6 Valve-securing test (Where applicable) ....................................................................................................10

8.2.7 Drop test ...............................................................................................................................................................................10

8.2.8 Flow test ...............................................................................................................................................................................10

8.3 Non-return valve ................................................................................................................................................................................11

8.3.1 Torque test .........................................................................................................................................................................11

8.3.2 Valve thread strength test .....................................................................................................................................11

© ISO 2019 – All rights reserved iii
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ISO 15738:2019(E)

8.3.3 Salt water exposure test .........................................................................................................................................11

8.3.4 Valve pull test ...................................................................................................................................................................11

8.3.5 Leak test ...............................................................................................................................................................................11

8.3.6 Valve-securing test (Where applicable) ....................................................................................................11

8.3.7 Drop test ...............................................................................................................................................................................11

9 Final determination of suitability of a system ....................................................................................................................11

10 Installation ..............................................................................................................................................................................................................12

Bibliography .............................................................................................................................................................................................................................13

iv © ISO 2019 – All rights reserved
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ISO 15738:2019(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 8, Ships and marine technology,

Subcommittee SC 1, Maritime safety.

This second edition cancels and replaces the first edition (ISO 15738:2002), which has been technically

revised.
The main changes compared to the previous edition are as follows:
— addition of the salt water exposure test for cylinders;

— modifications of the exposure period of the salt water exposure test according to ISO 9227:2017;

— restructuring of clauses of gas cylinder valves and operating heads;

— changes from the absolute values to the relative values in the test pressure of the pressure tests;

— modifications of the test pull loads of operating heads considering the friction in containers of

liferafts; and

— additions of the torque test, the valve thread strength test, the plug test, and the valve pull test for

necessary valves

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 2019 – All rights reserved v
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ISO 15738:2019(E)
Introduction

A gas inflation system for inflatable life-saving appliances is a vital system to inflate life-saving

appliances appropriately.

This document addresses the performance and testing of the gas inflation systems for inflatable life-

saving appliances including those specified in the 1974 Safety of Life at Sea Convention (SOLAS 74), as

amended, and the IMO International Life-Saving Appliance Code (LSA Code), adopted by IMO Resolution

MSC.48(66), as amended. In this sense, it supplements the International Maritime Organization (IMO)

requirements for inflatable lifesaving appliances.
vi © ISO 2019 – All rights reserved
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INTERNATIONAL STANDARD ISO 15738:2019(E)
Ships and marine technology — Maritime safety — Gas
inflation systems for inflatable life-saving appliances
1 Scope

This document specifies performance and testing requirements for gas inflation systems for inflatable

life-saving appliances.

NOTE It is suitable for inflatable life-saving appliances complying with the requirements of the 1974 Safety

of Life at Sea Convention (SOLAS 74), as amended, and the IMO International Life-Saving Appliance Code (LSA

Code) as amended, adopted by IMO Resolution MSC.48(66).

This document applies to gas inflation systems which consist of an inflation gas, a gas cylinder valve, a

gas cylinder operating head, high-pressure hoses, and pressure-relief/transfer, inflate/deflate and non-

return valves. This document addresses only systems in which compressed inflation gas in cylinders is

used as the inflation medium.

National requirements for qualification, use, and testing of gas cylinders vary widely. Such requirements

for gas cylinders are not addressed in this document, but it is presupposed that gas cylinders meet

the requirements of the applicable regulatory bodies. The systems addressed in this document are of

the type generally used in life-saving appliances, such as survival craft, marine evacuation systems,

and means of rescue. Systems used in personal life-saving appliances, such as inflatable lifejackets, are

addressed in ISO 12402-7.
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 9227:2017, Corrosion tests in artificial atmospheres — Salt spray tests
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

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

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
approved gas cylinder

gas cylinder which has been approved by a competent authority as complying with an appropriate

recognized national or international standard
3.2
gas cylinder valve

closure on a gas cylinder designed to control the transfer of the inflation gas from the cylinder to the

inflatable compartments
3.3
siphon tube

device or means to effect the transfer of the liquid phase from the gas cylinder before the gas phase

© ISO 2019 – All rights reserved 1
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ISO 15738:2019(E)
4 Gas cylinder — Salt water exposure test

Two gas cylinders shall have their ends blanked off and then shall be subjected to a corrosion test in

accordance with the neutral salt spray test in ISO 9227:2017, for a period of 168 h at 35 °C ± 2 °C. These

cylinders shall then be hydraulically proof tested to their test pressure. No permanent distortion and

no leakage are allowed after the test.
5 Inflation gas
5.1 Type and quantity

A non-toxic gas, such as carbon dioxide, shall be used for inflation. The type and quantity shall provide

a sufficient rate of inflation to allow the complete system to meet the specified inflation performance

requirements for the equipment in which it is installed.
5.2 Dryness

If the gas used is carbon dioxide, the moisture content of the gas used shall be no more than 150 parts

of water per 1 million parts of gas by mass.
6 Gas cylinder valve and operating head
6.1 General

If a gas cylinder valve is originally integrated with an operating head, the gas cylinder valve shall meet

the requirements of 6.2 and 6.3.
6.2 Gas cylinder valve
6.2.1 General

6.2.1.1 The gas cylinder valve shall be fitted with a safety relief device that vents gas prior to damage

to the gas cylinder due to over-pressurization.

6.2.1.2 Means shall be provided to protect the threads on the gas cylinder valve for attachment of the

high-pressure hoses and an operating head from damage during storage and transit. If the gas cylinder

valve is originally integrated with the operating head, the means may be provided only for the high-

pressure hoses.

6.2.1.3 A gas cylinder valve constructed from aluminum alloy shall be anodized and may only be used

with an aluminum cylinder, unless it is galvanically isolated from the cylinder.

6.2.1.4 Each combination of a gas cylinder valve and a gas cylinder that differ in materials, or any

aluminum alloy cylinder valve used with an aluminum gas cylinder, shall be subjected to the salt water

exposure test as described in 6.2.2.9.

6.2.1.5 If the gas cylinder valve is used with an inflation gas producing a liquid phase within the

certified value of pressure and temperature, the design of the gas cylinder valve shall prevent the transfer

of the gas phase until the liquid phase is transferred. A siphon tube or similar arrangements may be used,

in which it shall be ensured that, in all operational positions of the cylinder, the siphon tube's open end

remains submerged in the liquid phase.
2 © ISO 2019 – All rights reserved
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ISO 15738:2019(E)
6.2.2 Testing
6.2.2.1 Safety relief test

It shall be demonstrated that the safety relief device on the gas cylinders valve, when fitted to an

approved gas cylinder in accordance with the instructions of the cylinder valve manufacturer, operates

at a pressure not greater than the highest cylinder test pressure for which it is rated.

6.2.2.2 Proof-load test

The bodies of six gas cylinder valves shall be subjected to an internal hydraulic pressure 1,5 times the

test pressure for which the valve is rated. The pressure shall be held for a period of 2 min.

On completion of the test, there shall not be any signs of leakage or damage.
6.2.2.3 Temperature cycling test

Two gas cylinder valves fitted to approved gas cylinders, with a gas capacity of not less than 5 l, shall

be charged with 3,17 kg of CO /N gas in the ratio 96 %/4 % by mass, weighed and then alternately

2 2

subjected to surrounding temperatures of −30 °C and +65 °C. These alternating exposures need not

follow immediately after each other and the following procedure is acceptable.
a) Complete an 8 h half-cycle exposure at +65 °C in one day.

b) Remove the specimens from the hot chamber and leave them exposed to ordinary room temperature

until the following day.
c) Complete an 8 h half-cycle exposure at −30 °C the next day.

d) Remove the specimens from the cold chamber and leave them exposed to ordinary room

temperature until the following day.
e) Repeat the above procedure a further nine times.

f) On completion of the test, the gas cylinders shall be subjected to the leak test as per clause 6.2.2.6.

6.2.2.4 Cold inflation test

Gas cylinder valves fitted to two approved gas cylinders, with a gas capacity of not less than 5 l, one

charged with 3,17 kg of CO and the other charged with 3,17 kg of CO /N in the ratio 96 %/4 % by

2 2 2

mass, shall be placed in a cold chamber at a temperature of –30 °C for a period of 3 h.

On completion, the gas shall be capable of being completely and continuously discharged within 20 s

through a nozzle containing four holes of diameter 3,3 mm. There shall be no interruptions of flow by

ice formation.

Where a siphon tube is fitted, the cylinder shall be rotated through 180° at least every 5 s during the

discharge to demonstrate the efficacy of the siphon tube.
6.2.2.5 Fatigue test

Two gas cylinder valve bodies shall be hydraulically pressure-cycled internally in a laboratory from

0 MPa to 20 MPa for 33 000 cycles.

On completion of the test, they shall be subjected to a hydraulic pressure 1,5 times the test pressure for

which the valve is rated. The pressure shall be held for a period of 2 min. There shall be no damage to

the valve bodies after this test.
© ISO 2019 – All rights reserved 3
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ISO 15738:2019(E)
6.2.2.6 Long-term leak test

Two gas cylinders assembled with the valves used in the temperature cycling test in 6.2.2.3 shall be tested

to ensure that they shall not lose more than 2 % of the original mass of the gas over an 18 month period.

The procedure of measuring mass loss is as follows.

a) The gas cylinder valves shall be fitted to two approved gas cylinders, with a gas capacity of not less

than 5 l, charged with not less than 3,17 kg of CO /N gas in the ratio 96 %/4 % by mass.

2 2

b) The cylinders shall be weighed carefully and then stowed in a secure stowage place for a period of

18 months at an ambient temperature of 18 °C to 20° C.

c) On completion of the 18 month period, the cylinders shall be reweighed and the loss of gas charge

on each cylinder shall not exceed 2 % of the original mass of the gas.
6.2.2.7 Impact test

One of the gas cylinders and gas cylinder valves used in the long-term leak test, after being fully

discharged of gas, shall be dropped 9 times from a height of 300 mm at an angle of 45° onto a concrete

floor covered with hardboard so that the valve receives the full force of the impact.

The test shall be repeated with the cylinder angled in a plane at 90° to the original test.

After the above test, the cylinder shall be stood vertically on its base, and pushed over so that, as it falls,

the gas cylinder valve strikes a steel stop secured to the floor. The height of the steel stop shall be not

less than half the diameter of the cylinder used for the test. The test shall be repeated 12 times.

On completion of the above test, the valve shall be carefully examined using appropriate means. There

shall not be any signs of flaw or fracture other than superficial surface damage.

An approved gas cylinder, with a mass of at least 8,165 kg, fitted with the gas cylinder valve shall be

dropped three times from a height of 1,5 m onto an aluminum sheet so that the valve takes the full force

of the impact at an angle of 60° to the sheet.

The aluminum sheet shall be removed and the test shall be repeated with a single drop onto a

concrete floor.

On completion of the tests, the valve shall be removed from the cylinder and carefully examined. There

shall not be any signs of flaw or fracture other than superficial surface damage.

6.2.2.8 Torque test

An approved gas cylinder shall be valved and devalved in accordance with the instructions of the valve

manufacturer. The test shall be repeated six cycles.

On completion of the test, carefully examine the valve threads. There shall not be any signs of damage.

6.2.2.9 Salt water exposure test
6.2.2.9.1 Application

This test is applicable to combinations of gas cylinder valve and approved gas cylinder that are of

differing in materials, or any aluminum-alloy gas cylinder valve used with an approved aluminum gas

cylinder.
4 © ISO 2019 – All rights reserved
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ISO 15738:2019(E)
6.2.2.9.2 Test procedure

Two gas cylinder valve operating head assemblies shall be assembled to approved gas cylinders filled

with a typical gas charge. The assemblies shall be subjected to a corrosion test in accordance with the

neutral salt spray test in ISO 9227:2017 for a period of 168 h at 35 °C ± 2 °C.

On completion of this test, the assemblies shall be checked to ensure that no more than 2% of the gas

charge has been lost.

The system shall demonstrate that it functions correctly at an ambient temperature of 18 °C to 20 °C

and the pull load does not exceed 125 N.

NOTE This test can be performed simultaneously with the test specified in 6.3.2.4.

6.3 Gas cylinder operating head
6.3.1 General

The operating head fitted to a charged gas cylinder shall be able to fully open the gas cylinder valve

with a pull load less than 125 N and a pull distance of less than 200 mm at the temperature range of

–30 °C to +65 °C.
The operating head shall be made from corrosion-resistant materials.

An operating head constructed from aluminum alloy shall be anodized and shall comply with 6.2.1.4.

Means shall be provided, as necessary, to prevent kinking of the cable and abrasive damage to the fabric

of an inflatable survival craft.
The operating head shall be sealed against the ingress of water.

The operating head shall be of a design that prevents any chafing of the fabric of an inflatable

survival craft.

NOTE The 125 N pull load is a component performance requirement, whereas the maximum activation force

of 150 N in LSA Code and MSC.81(70) Part 2 is for fully assembled liferafts where some additional friction should

be expected.
6.3.2 Testing
6.3.2.1 Hot actuation-force test

Two operating heads fitted to approved gas cylinders, with a gas capacity of not less than 5 l, charged

with 3,17 kg of CO , shall be placed in a hot chamber at a temperature of +65 °C for a period of 2 h. On

removal from the hot chamber, the force required to activate the heads shall be measured.

The force shall not exceed 125 N.
6.3.2.2 Cold actuation-force test

Two operating heads fitted to approved gas cylinders, with a gas capacity of not less than 5 l, charged

with 3,17kg of CO , shall be placed in a cold chamber at a temperature of −30 °C for a period of 2 h. On

removal from the chamber, the force required to activate t
...

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