EN ISO 23208:2019

Cryogenic vessels - Cleanliness for cryogenic service (ISO 23208:2017)

ISO 23208:2017 specifies the minimum requirements for the cleanliness of all surfaces of cryogenic vessels and associated accessories that are in contact with the cryogenic fluid at any expected operating conditions.
ISO 23208:2017 defines the acceptable level of surface and particle contamination to minimize the risk of malfunction of equipment and ensure safety against ignition when in contact with oxygen or oxidizing fluids (see ISO 10156).

Kryo-Behälter - Reinheit für den tiefkalten Betrieb (ISO 23208:2017)

Dieses Dokument legt die Mindestanforderungen an die Reinheit aller Oberflächen von Kryo-Behältern und der zugehörigen Zubehörteilen fest, die mit dem tiefkalten Fluid bei allen zu erwartenden Betriebsbedingungen in Berührung kommen.
Dieses Dokument legt den annehmbaren Grad von Oberflächenverunreinigungen und Verunreinigungen durch Partikel fest, um das Risiko des Versagens der Einrichtung zu minimieren und Schutz gegen das Entzünden bei Berührung mit Sauerstoff oder oxidierenden Fluiden zu bieten (siehe ISO 10156).

Récipients cryogéniques - Propreté en service cryogénique (ISO 23208:2017)

Le présent document spécifie les exigences minimales de propreté applicables à toutes les surfaces des récipients cryogéniques et de leurs accessoires, qui se trouvent en contact avec le fluide cryogénique, quelles que soient les conditions d'utilisation prévues.
Le présent document définit le niveau acceptable de contamination des surfaces et des particules, afin de minimiser les risques de dysfonctionnements de l'équipement et d'assurer une protection contre les risques d'ignition lors de l'entrée en contact avec l'oxygène ou les fluides oxydants (voir l'ISO 10156).

Kriogene posode - Čistoča za obratovanje v kriogenem območju (ISO 23208:2017)

Ta dokument določa minimalne zahteve za čistočo vseh površin kriogenskih posod in povezanega pribora, ki so v stiku s kriogeno tekočino pri vseh pričakovanih obratovalnih pogojih.
Ta dokument opredeljuje mejo sprejemljivosti površinskega onesnaženja in onesnaženja z delci za zmanjšanje tveganja za motnje v delovanju opreme in zagotovitev zaščite pred vžigom ob stiku s kisikom ali tekočinami, ki oksidirajo (glej EN ISO 10156).

General Information

• Status: Published
• Publication Date: 26-Mar-2019
• Withdrawal Date: 26-Sep-2019
• ICS: 23.020.40 - Cryogenic vessels
• Technical Committee: CEN/TC 268 - Cryogenic vessels
• Drafting Committee: CEN/TC 268/WG 2 - Compatibility, insulation, accessories
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 27-Mar-2019
• Due Date: 05-Oct-2020
• Completion Date: 27-Mar-2019
• Directive: 2008/68/EC - Directve 2008/68/EC of the European Parliament and of the council of 24 September 2008 on the inland transport of the dangerous goods
• Mandate: M/086 - Mandate to CEN for standardization in the field of transport of dangerous goods
• Ref Project: SIST EN ISO 23208:2019 - Cryogenic vessels - Cleanliness for cryogenic service (ISO 23208:2017)

Relations

• Replaces: EN 12300:1998/A1:2006 - Cryogenic vessels - Cleanliness for cryogenic service
• Effective Date: 03-Apr-2019
• Replaces: EN 12300:1998 - Cryogenic vessels - Cleanliness for cryogenic service
• Effective Date: 25-Apr-2018
• Amended By: EN ISO 23208:2019/A1:2020 - Cryogenic vessels - Cleanliness for cryogenic service - Amendment 1 (ISO 23208:2017/Amd 1:2020)
• Effective Date: 26-Jun-2019

Overview

EN ISO 23208:2019 (identical to ISO 23208:2017) specifies minimum cleanliness requirements for cryogenic vessels and associated accessories that contact cryogenic fluids at any expected operating condition. The standard defines acceptable levels of surface and particle contamination to reduce equipment malfunction risk and to ensure safety against ignition when components contact oxygen or oxidizing fluids.

Key topics and requirements

• Scope: Applies to all surfaces in contact with cryogenic fluids (refrigerated gases, evaporated liquids, supercritical fluids).
• Contamination limits: Particles visible to the naked eye under daylight/white light are unacceptable. For oxygen/oxidizing service, the maximum recommended hydrocarbon contamination is 500 mg/m² (guidance from CGA G‑4.1); lower limits may be required for specific applications.
• Prohibited residues: Chips, oxide scale, weld spatter, free water and detectable hydrocarbons, paints, adhesives or incompatible coatings are not acceptable for oxygen service unless demonstrated oxygen-compatible (see ISO 21010).
• Welding practice: Root passes of pipe welds must be protected (e.g., with forming gas) to avoid gross porosity.
• Cleaning procedures: Any method is acceptable provided the cleanliness requirements are met. Solvents/agents must be compatible with all materials (including plastics) and removed completely when cleaning for oxygen service.
• Inspection and evaluation: Select inspection/sampling methods that complement the cleaning technique. Annex A lists practical inspection methods such as direct visual (white light), UV fluorescence, wipe/solvent flush and solvent immersion/drain techniques. Inspection methods must not introduce contamination.
• Post‑cleaning protection & packaging: Cleaned items must be protected (sealed, purged, or packaged) to prevent recontamination. Protective gases must be dry, oil‑free and dust‑free; packaging must be removable without leaving residues.
• Identification & documentation: Conformity must be evidenced by a certificate or label: “ISO 23208 – cleaned oxygen” for oxygen/oxidizing fluids or “ISO 23208” for other cryogenic fluids. Protective gas type and pressure should be indicated if used.

Applications and users

• Who uses it: Cryogenic vessel manufacturers, industrial gas suppliers, LNG and hydrogen system integrators, OEMs, commissioning and maintenance teams, QA/QC inspectors, and cleaning service providers.
• Typical applications: Storage and transport tanks, transfer piping, valve bodies and accessories used with oxygen, nitrogen, LNG, hydrogen and other cryogenic fluids where contamination control is critical to performance and safety.

Related standards

• ISO 21010 - Cryogenic vessels: gas/materials compatibility
• ISO 10156 - Oxygen/oxidizer properties and combustibility guidance
• Referenced guidance: CGA G‑4.1 and EIGA documents (for hydrocarbon guidance and contamination migration)

Keywords: EN ISO 23208:2019, ISO 23208:2017, cryogenic vessels, cleanliness, oxygen service, oxidizing fluids, inspection methods, hydrocarbon contamination, post‑cleaning protection.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2019
Nadomešča:
SIST EN 12300:1999
SIST EN 12300:1999/A1:2006
Kriogene posode - Čistoča za obratovanje v kriogenem območju (ISO 23208:2017)
Cryogenic vessels - Cleanliness for cryogenic service (ISO 23208:2017)
Kryo-Behälter - Reinheit für den tiefkalten Betrieb (ISO 23208:2017)
Récipients cryogéniques - Propreté en service cryogénique (ISO 23208:2017)
Ta slovenski standard je istoveten z: EN ISO 23208:2019
ICS:
23.020.40 Proti mrazu odporne posode Cryogenic vessels
(kriogenske posode)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 23208
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2019
EUROPÄISCHE NORM
ICS 23.020.40 Supersedes EN 12300:1998
English Version
Cryogenic vessels - Cleanliness for cryogenic service (ISO
23208:2017)
Récipients cryogéniques - Propreté en service Kryo-Behälter - Reinheit für den tiefkalten Betrieb (ISO
cryogénique (ISO 23208:2017) 23208:2017)
This European Standard was approved by CEN on 11 February 2019.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23208:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 23208:2017 has been prepared by Technical Committee ISO/TC 220 "Cryogenic vessels”
of the International Organization for Standardization (ISO) and has been taken over as
technologies applications” 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 September 2019, and conflicting national standards
shall be withdrawn at the latest by September 2019.
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.
This document supersedes EN 12300:1998.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 23208:2017 has been approved by CEN as EN ISO 23208:2019 without any modification.

INTERNATIONAL ISO
STANDARD 23208
Second edition
2017-04
Cryogenic vessels — Cleanliness for
cryogenic service
Récipients cryogéniques — Propreté en service cryogénique
Reference number
ISO 23208:2017(E)
©
ISO 2017
ISO 23208:2017(E)
© 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
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
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ii © ISO 2017 – All rights reserved

ISO 23208:2017(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 1
4.1 General requirements . 1
4.2 Additional requirements for oxygen and oxidizing fluids . 2
5 Cleaning procedure . 2
6 Cleanliness evaluation . 2
7 Post-cleaning protection . 2
8 Identification . 3
Annex A (informative) Inspection methods . 4
Bibliography . 7
ISO 23208:2017(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
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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 on the voluntary nature of standards, the meaning of ISO specific terms and
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World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: w w w . i s o .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 220, Cryogenic vessels.
This second edition cancels and replaces the first edition (ISO 23208:2005), which has been technically
revised. The main changes are in 4.1.
iv © ISO 2017 – All rights reserved

INTERNATIONAL STANDARD ISO 23208:2017(E)
Cryogenic vessels — Cleanliness for cryogenic service
1 Scope
This document specifies the minimum requirements for the cleanliness of all surfaces of cryogenic
vessels and associated accessories that are in contact with the cryogenic fluid at any expected operating
conditions.
This document defines the acceptable level of surface and particle contamination to minimize the risk of
malfunction of equipment and ensure safety against ignition when in contact with oxygen or oxidizing
fluids (see ISO 10156).
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 21010, Cryogenic vessels — Gas/materials compatibility
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:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1
cryogenic fluid
gas which is partially liquid because of its low temperature
Note 1 to entry: It includes totally evaporated liquids and supercritical fluids.
Note 2 to entry: In the context of this document, refrigerated but non-toxic gases and mixtures of them are
referred to as cryogenic fluids.
Note 3 to entry: See also ISO 21029-1, ISO 20421-1 and/or ISO 21009-1.
3.2
oxidizing fluid
cryogenic fluid (3.1)
...