Ships and marine technology -- Safety valve for cargo tanks of LNG carriers -- Design and testing requirements

ISO 18154:2017 specifies the requirements of design, test and inspection methods for diaphragm-type pilot operated safety valves, which are used in cargo tanks of LNG carriers in order to keep the pressure inside the tank below maximum allowable working pressure.

Navires et technologie maritime -- Soupape de sûreté pour les réservoirs de cargaison des méthaniers -- Exigences de conception et d'essai

General Information

Status
Published
Publication Date
19-Mar-2017
Current Stage
6060 - International Standard published
Start Date
09-Feb-2017
Completion Date
20-Mar-2017
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ISO 18154:2017 - Ships and marine technology -- Safety valve for cargo tanks of LNG carriers -- Design and testing requirements
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INTERNATIONAL ISO
STANDARD 18154
First edition
2017-03
Ships and marine technology — Safety
valve for cargo tanks of LNG carriers
— Design and testing requirements
Navires et technologie maritime — Soupape de sûreté pour les
réservoirs de cargaison des méthaniers — Exigences de conception
et d’essai
Reference number
ISO 18154:2017(E)
ISO 2017
---------------------- Page: 1 ----------------------
ISO 18154:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

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ii © ISO 2017 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 18154:2017(E)
Contents Page

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

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

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

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

4 Main valve components ................................................................................................................................................................................. 2

4.1 Body .................................................................................................................................................................................................................. 2

4.2 Nozzle.............................................................................................................................................................................................................. 2

4.3 Disk ................................................................................................................................................................................................................... 2

4.4 Cover ................................................................................................................................................................................................................ 2

4.5 Diaphragm .................................................................................................................................................................................................. 2

5 Design .............................................................................................................................................................................................................................. 3

6 Materials ....................................................................................................................................................................................................................... 4

7 Production testing and inspection ..................................................................................................................................................... 4

7.1 Purpose .......................................................................................................................................................................................................... 4

7.2 Impact test .................................................................................................................................................................................................. 4

7.3 Non-destructive inspection .......................................................................................................................................................... 4

7.4 Pressure test .............................................................................................................................................................................................. 5

7.4.1 General requirement .................................................................................................................................................... 5

7.4.2 Fluid ............................................................................................................................................................................................ 5

7.4.3 Duration................................................................................................................................................................................... 5

7.4.4 Test equipment .................................................................................................................................................................. 5

7.5 Surface inspection ................................................................................................................................................................................ 5

7.6 Visual inspection ................................................................................................................................................................................... 5

8 Performance test .................................................................................................................................................................................................. 6

8.1 Performance test in ambient temperature ..................................................................................................................... 6

8.1.1 Purpose .................................................................................................................................................................................... 6

8.1.2 Number of test times .................................................................................................................................................... 6

8.1.3 Fluid ............................................................................................................................................................................................ 6

8.1.4 Acceptance criteria ........................................................................................................................................................ 6

8.2 Leakage test in ambient temperature ................................................................................................................................. 6

8.2.1 Purpose .................................................................................................................................................................................... 6

8.2.2 Fluid ............................................................................................................................................................................................ 6

8.2.3 Test pressure ....................................................................................................................................................................... 6

8.2.4 Duration................................................................................................................................................................................... 6

8.2.5 Acceptance leakage rate ............................................................................................................................................ 6

8.2.6 Test equipment .................................................................................................................................................................. 7

8.3 Performance test in low temperature ................................................................................................................................. 7

8.3.1 Purpose .................................................................................................................................................................................... 7

8.3.2 Number of test times .................................................................................................................................................... 7

8.3.3 Fluid ............................................................................................................................................................................................ 7

8.3.4 Acceptance criteria ........................................................................................................................................................ 7

8.4 Preparation for the performance test in low temperature ............................................................................... 7

8.4.1 Start temperature for the test ............................................................................................................................... 7

8.4.2 Safety requirement ........................................................................................................................................................ 7

8.4.3 Test system ........................................................................................................................................................................... 7

8.5 Leakage test in low temperature ............................................................................................................................................. 8

8.5.1 Purpose .................................................................................................................................................................................... 8

8.5.2 Fluid ............................................................................................................................................................................................ 8

8.5.3 Test pressure ....................................................................................................................................................................... 8

8.5.4 Duration................................................................................................................................................................................... 8

8.5.5 Acceptance tolerance ................................................................................................................................................... 9

8.5.6 Test equipment .................................................................................................................................................................. 9

© ISO 2017 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 18154:2017(E)

9 Vacuum test ................................................................................................................................................................................................................ 9

9.1 Purpose .......................................................................................................................................................................................................... 9

9.2 Vacuum condition ................................................................................................................................................................................. 9

9.2.1 Test temperature ............................................................................................................................................................. 9

9.2.2 Vacuum set test ................................................................................................................................................................. 9

9.2.3 Number of test times .................................................................................................................................................... 9

9.2.4 Fluid ............................................................................................................................................................................................ 9

10 Type test ........................................................................................................................................................................................................................ 9

11 Determination of pilot operated safety valve performance .................................................................................... 9

12 Sizing of pilot operated safety valves ...........................................................................................................................................10

13 Marking and sealing .......................................................................................................................................................................................10

Bibliography .............................................................................................................................................................................................................................11

iv © ISO 2017 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 18154:2017(E)
Foreword

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