ISO 10665:2024

Ships and marine technology — Ship design — CNG and LNG propulsion system

This document specifies the requirements for the installation of compressed natural gas (CNG) and liquefied natural gas (LNG) propulsion systems and components on ships and crafts. This document does not apply to large sea-going ships covered by SOLAS Chapter II-1 vessels. This document does not cover appliances with directly attached gas cylinders, such as portable container.

Navires et technologie maritime — Conception maritime — Système de propulsion GNC et GNL

General Information

• Status: Published
• Publication Date: 26-Nov-2024
• ICS: 47.020.20 - Marine engines and propulsion systems
• Technical Committee: ISO/TC 8/SC 8 - Ship design
• Drafting Committee: ISO/TC 8/SC 8 - Ship design
• Current Stage: 6060 - International Standard published
• Start Date: 27-Nov-2024
• Due Date: 27-Nov-2024
• Completion Date: 27-Nov-2024

Standards Content (Sample)

International
Standard
ISO 10665
First edition
Ships and marine technology —
2024-11
Ship design — CNG and LNG
propulsion system
Navires et technologie maritime — Conception maritime —
Système de propulsion GNC et GNL
Reference number
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and Definitions . 2
4 Components . 6
4.1 General provisions .6
4.2 CNG cylinders and LNG containers . .7
4.2.1 General provisions .7
4.2.2 Cylinders .7
4.2.3 Fixed container .7
4.2.4 Components fitted to the cylinder or fixed container .7
4.3 Fuel system components .8
4.3.1 Vaporizer .8
4.3.2 Other components .8
5 Installation requirements . 9
5.1 General requirements .9
5.2 Installer of the CNG or LNG system .10
5.3 Additional CNG or LNG systems not connected to the propulsion system .10
5.4 Modifications to the structure of the ship or craft.10
5.5 Container or cylinder installation .11
5.5.1 General .11
5.5.2 Fixed containers/cylinders .11
5.5.3 Cylinders and Containers . . . 12
5.5.4 Cylinders and containers lockers . 12
5.6 Components fitted to the fixed container/cylinder . 13
5.6.1 General requirement . . 13
5.6.2 Remote-controlled service valve and excess flow valve on the container . 13
5.6.3 Pressure relief valve. 13
5.6.4 Filler valve . 13
5.6.5 Level indicator . 13
5.6.6 Fittings . 13
5.6.7 Pressure relief device . 13
5.7 Gas pipes and hoses .14
5.8 Other components . 15
5.8.1 Gas connections between components of the CNG or LNG system . 15
5.8.2 Remote-controlled shut-off valve .16
5.8.3 Filling unit .16
5.9 Electrical installation .16
5.10 Fuel selection system .17
5.11 Gas detection .17
5.11.1 General .17
5.11.2 Alarm position .18
5.11.3 Sensors position .18
5.12 Forced ventilation .18
5.12.1 General .18
5.12.2 Purging of engine space .18
5.12.3 Position of venting .18
6 Fire-extinguishing equipment .18
7 Owner's manual .18
8 Commissioning. 19
8.1 Tightness test .19

iii
8.2 Leakage test .19
8.3 Initial filling of the container and cylinder and the system with LNG/CNG .19
8.4 Fuel System test .19
8.5 Water trial. 20
Annex A (normative) Owner's manual .21
Annex B (informative) Example of installation certificate .24
Annex C (informative) Example CNG or LNG identification label .25
Bibliography .27

iv
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for
...