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EN ISO 20257-2:2021

(Main)

Installation and equipment for liquefied natural gas - Design of floating LNG installations - Part 2: Specific FSRU issues (ISO 20257-2:2021)

Installation and equipment for liquefied natural gas - Design of floating LNG installations - Part 2: Specific FSRU issues (ISO 20257-2:2021)

This document provides specific requirements and guidance for the design and operation of floating LNG storage and regasification units (FSRU) described in ISO 20257-1.
This document is applicable to offshore, near-shore or docked FSRUs and to both new-built and converted FSRUs.
This document includes requirements to the jetty when an FSRU is moored to a jetty.

Anlagen und Ausrüstung für Flüssigerdgas - Auslegung von schwimmenden Flüssigerdgas-Anlagen - Teil 2: Spezifische Anmerkungen zu FSRU (ISO 20257-2:2021)

Dieses Dokument enthält spezifische Anforderungen und Anleitungen in Bezug auf die Auslegung und den Betrieb von schwimmenden Einheiten für die Speicherung und Wiederverdampfung (FSRU, en: floating storage regasification unit) von Flüssigerdgas (LNG, en: liquefied natural gas), wie in ISO 20257 1 beschrieben.
Dieses Dokument ist auf Offshore-Anlagen, Anlagen in Küstennähe oder angedockte FSRU anwendbar und gilt sowohl für neu gebaute als auch für umgebaute FSRU.
Dieses Dokument enthält Anforderungen an den Pier, wenn eine FSRU an einen Pier vertäut ist.

Installations et équipements de gaz naturel liquéfié - Conception des installations flottantes de GNL - Partie 2: Questions spécifiques aux FSRU (ISO 20257-2:2021)

Le présent document fournit des recommandations et exigences spécifiques pour la conception et l'exploitation des unités flottantes de stockage et de regazéification de GNL (FSRU) tel que décrites dans l'ISO 20257-1.
Le présent document s’applique aux FSRU en mer, côtiers ou à quai et tant aux FSRU construits à neuf qu'à ceux convertis.
Le présent document inclut l'appontement dans le cas de l'amarrage d'un FSRU.

Napeljave in oprema za utekočinjeni zemeljski plin - Načrtovanje plavajočih napeljav za utekočinjeni zemeljski plin - 2. del: Posebne zahteve za plavajoča skladišča z enotami za uplinjanje (FSRU) (ISO 20257-2:2021)

General Information

Status
Published
Publication Date
22-Jun-2021
Withdrawal Date
30-Dec-2021
ICS
75.200 - Petroleum products and natural gas handling equipment
Technical Committee
CEN/TC 282 - Installation and equipment for LNG
Drafting Committee
CEN/TC 282 - Installation and equipment for LNG
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
23-Jun-2021
Completion Date
23-Jun-2021
Ref Project
SIST EN ISO 20257-2:2021 - Installation and equipment for liquefied natural gas - Design of floating LNG installations - Part 2: Specific FSRU issues (ISO 20257-2:2021)

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SLOVENSKI STANDARD
01-oktober-2021
Napeljave in oprema za utekočinjeni zemeljski plin - Načrtovanje plavajočih
napeljav za utekočinjeni zemeljski plin - 2. del: Posebne zahteve za plavajoča
skladišča z enotami za uplinjanje (FSRU) (ISO 20257-2:2021)
Installation and equipment for liquefied natural gas - Design of floating LNG installations
- Part 2: Specific FSRU issues (ISO 20257-2:2021)
Anlagen und Ausrüstung für Flüssigerdgas - Auslegung von schwimmenden
Flüssigerdgas-Anlagen - Teil 2: Besondere Anmerkungen zu FSRU (ISO 20257-2:2021)
Installations et équipements de gaz naturel liquéfié - Conception des installations
flottantes de GNL - Partie 2: Questions spécifiques aux FSRU (ISO 20257-2:2021)
Ta slovenski standard je istoveten z: EN ISO 20257-2:2021
ICS:
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 20257-2
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2021
EUROPÄISCHE NORM
ICS 75.200
English Version
Installation and equipment for liquefied natural gas -
Design of floating LNG installations - Part 2: Specific FSRU
issues (ISO 20257-2:2021)
Installations et équipements de gaz naturel liquéfié - Anlagen und Ausrüstung für Flüssigerdgas - Auslegung
Conception des installations flottantes de GNL - Partie von schwimmenden Flüssigerdgas-Anlagen - Teil 2:
2: Questions spécifiques aux FSRU (ISO 20257-2:2021) Besondere Anmerkungen zu FSRU (ISO 20257-2:2021)
This European Standard was approved by CEN on 28 May 2021.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20257-2:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 20257-2:2021) has been prepared by Technical Committee ISO/TC 67
"Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries"
in collaboration with Technical Committee CEN/TC 282 “Installation and equipment for LNG” the
secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by December 2021, and conflicting national standards
shall be withdrawn at the latest by December 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 20257-2:2021 has been approved by CEN as EN ISO 20257-2:2021 without any
modification.
INTERNATIONAL ISO
STANDARD 20257-2
First edition
2021-06
Installation and equipment for
liquefied natural gas — Design of
floating LNG installations —
Part 2:
Specific FSRU issues
Installations et équipements de gaz naturel liquéfié — Conception des
installations flottantes de GNL —
Partie 2: Questions spécifiques aux FSRU
Reference number
ISO 20257-2:2021(E)
©
ISO 2021
ISO 20257-2:2021(E)
© ISO 2021
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

ISO 20257-2:2021(E)
Contents Page
Foreword .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 2
3.1 Terms and definitions . 2
3.2 Abbreviated terms . 2
4 Basis of design . 3
4.1 General description of FSRU. 3
4.2 Main design criteria for process facilities . 5
4.3 Reliability, availability and maintainability of LNG floating installation . 6
4.4 Specific requirements for FSRU operating as LNG carrier . 6
4.5 Specific FSRU studies . 6
4.5.1 General. 6
4.5.2 Environmental impact of seawater intake and discharge study. 6
4.5.3 Recirculation study . 7
4.5.4 Scour protection study . 7
5 Specific health, safety and environmental issues . 7
5.1 General . 7
5.2 Environmental considerations related to water heating and cooling issues . 7
5.3 Safety considerations . 8
5.3.1 General requirements . 8
5.3.2 Layout constrains . 8
5.3.3 Layout constraints with respect to surroundings . 9
5.3.4 Layout constraints with respect to facility arrangement .10
5.3.5 Risk prevention measures .11
6 Mooring and stationkeeping .16
7 Hull design .16
8 LNG storage .17
8.1 Specific requirements for cargo tank pressure management .17
8.2 Specific requirements for LNGC overpressure protection .17
8.3 Rollover risk .17
9 Transfer systems .17
9.1 General .17
9.2 Send-out natural gas: NG gas transfer requirements .17
9.2.1 Functional requirements .17
9.2.2 Transfer systems design .18
9.2.3 Emergency disconnection .19
9.2.4 Operating envelope . .19
9.3 LNG sampling .20
10 BOG handling and recovery .21
10.1 General .21
10.2 LNG tank design pressure flexibility .21
10.3 Specific requirements for recondenser .21
10.4 Specific requirements for gas compressors .22
10.4.1 General.22
10.4.2 Specific functional requirements for LD compressors .22
10.4.3 Specific functional requirements for HD compressors .
...

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