EN 1626:2008

Cryogenic vessels - Valves for cryogenic service

This European Standard specifies the requirements for the design, manufacture and testing of valves for cryogenic service, i.e. for operation with cryogenic fluids (as defined in EN 1251-1) below - 10 °C as well as at ambient conditions to allow for start-up and run-down. It specifies additional requirements for cryogenic service for the appropriate valve product standard.
NOTE   a cryogenic fluid (refrigerated liquefied gas) is a gas which is partially liquid because of its low temperature (including totally evaporated liquids and supercritical fluids).
It applies to sizes up to DN 150 including vacuum jacketed cryogenic valves.
This European Standard is not applicable to safety valves and valves for liquefied natural gas (LNG).
It is intended that the valve be designed and tested to satisfy a pressure rating (PN or Class). Valves may then be selected with a PN or Class equal to or greater than the maximum allowable pressure (PS) of the equipment with  which it is to be used.

Kryo-Behälter - Absperrarmaturen für tiefkalten Betrieb

Diese Europäische Norm legt die Anforderungen an die Konstruktion, Herstellung und Prüfung von Absperr-armaturen für den Kryo-Betrieb fest, d. h. für den Betrieb mit tiefkalten Fluiden unter –10 °C, wobei der Betrieb unter Umgebungsbedingungen einbezogen wird, um das Aktivieren und Deak¬tivieren (Hoch  und Hinunter¬fahren) zu berücksichtigen. Für die jeweiligen Armatur Produktnor¬men werden zusätzliche Anforderungen an den Kryo-Betrieb festgelegt.
ANMERKUNG   Ein tiefkaltes Fluid (tiefgekühltes verflüssigtes Gas) ist ein Gas, das wegen seiner niedrigen Temperatur teilweise flüssig ist (total verdampfte Flüssigkeiten und überkritische Fluide sind einbezogen).
Diese Europäische Norm gilt für Nennweiten bis DN 150 und auch für vakuum isolierte tiefkalte Absperr-armaturen.
Sie gilt nicht für Sicherheitsarmaturen und Absperrarmaturen für verflüssigtes Erdgas (LNG, en: liquified natural gas).
Es ist vorgesehen, die Armaturen so zu bemessen und zu prüfen, dass sie einer Druckstufe (PN oder Class) entsprechen. Die Armaturen dürfen dann nach einem Nenndruck PN oder einer Class ausgewählt werden, der/die gleich oder größer als der maximal zulässige Druck (PS) der Anlage ist, in der sie eingesetzt werden.

Récipients cryogéniques - Robinets pour usage cryogénique

La présente Norme européenne spécifie les prescriptions relatives à la conception, à la fabrication et aux
essais des robinets pour usage cryogénique c'est-à-dire destinés à fonctionner avec des fluides cryogéniques
(tels que définis dans l’EN 1251-1) à une température inférieure à -10 °C ainsi qu'à une température ambiante
pour permettre le démarrage et l'arrêt de l'installation qu'ils équipent. Elle spécifie les prescriptions
supplémentaires pour usage cryogénique par rapport aux normes appropriées de robinets.
NOTE Un fluide cryogénique (gaz liquéfié réfrigéré) est un gaz partiellement liquide en raison de sa basse
température (liquides totalement évaporés et fluides supercritiques inclus).
Elle s’applique aux robinets cryogéniques dont le diamètre nominal DN n’excède pas 150 et aux robinets
cryogéniques isolés sous vide.
La présente Norme européenne ne s’applique pas aux soupapes de sécurité ni aux robinets pour gaz naturel
liquéfié (GNL).
Il est prévu que le robinet soit conçu et soumis à l’essai pour satisfaire une pression nominale (PN ou classe).
Les robinets peuvent ensuite être choisis avec une pression nominale ou classe supérieure ou égale à la
pression maximale admissible (PS) de l’équipement avec lequel ils sont utilisés.

Kriogene posode - Ventili za kriogeno področje

General Information

• Status: Published
• Publication Date: 04-Nov-2008
• ICS: 23.020.40 - Cryogenic vessels
• ICS: 23.060.01 - Valves in general
• Technical Committee: CEN/TC 268 - Cryogenic vessels
• Drafting Committee: CEN/TC 268/WG 2 - Compatibility, insulation, accessories
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 07-Sep-2018
• Completion Date: 14-Apr-2025
• 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
• Directive: 2014/68/EU - Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment
• Directive: 94/55/EC - Transport of dangerous goods by road
• Directive: 96/49/EC - Transport of dangerous goods by rail
• Directive: 96/86/EC - Transport of dangerous goods by road (94/55/EC Dir. amendment)
• Directive: 96/87/EC - Transport of dangerous goods by rail (96/49/EC Dir. amendment)
• Directive: 97/23/EC - Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Mandate: M/086 - Mandate to CEN for standardization in the field of transport of dangerous goods
• Ref Project: SIST EN 1626:2009 - Cryogenic vessels - Valves for cryogenic service

Relations

• Replaces: EN 1626:1999 - Cryogenic vessels - Valves for cryogenic service
• Effective Date: 22-Dec-2008
• Revised: FprEN ISO 21011 - Cryogenic vessels - Valves for cryogenic service (ISO/FDIS 21011:2023)
• Effective Date: 28-Jan-2023

Overview

EN 1626:2008 - produced by CEN - sets mandatory requirements for the design, manufacture and testing of valves for cryogenic service. It applies to valves used with cryogenic fluids (as defined in EN 1251‑1) operating below −10 °C and at ambient conditions (for start‑up and run‑down), up to nominal size DN 150, including vacuum‑jacketed cryogenic valves. The standard excludes safety valves and LNG‑specific valves and expects valves to be designed and tested to a pressure rating (PN or Class).

Key Topics and Technical Requirements

• Materials and toughness
  • Metallic materials must meet toughness requirements (EN 1252‑1) for parts exposed to cryogenic temperatures; non‑ferrous alloys without brittle transition may be exempt.
  • Corrosion resistance and oxygen compatibility (EN 1797) required where applicable; special notes for hydrogen and acetylene service.
• Non‑metallic parts
  • Seats, packings and gland materials must support cryogenic cycling and pass sample valve ageing tests; oxygen compatibility required when applicable.
• Design fundamentals
  • Extended stems or suitable stem packing for low temperatures; gland nuts must not unscrew unintentionally.
  • Prevent trapped‑liquid cavities (pressure relief passages or pressure‑relieving seats recommended).
  • Bonnet types, securing of gland extensions (bronze/copper alloy valves PN ≥100), seat support/backing and stem blow‑out protection specified.
  • Electrical continuity: maximum resistance 1000 Ω to avoid static build‑up; explosive‑atmosphere suitability for flammable fluids.
• Operational limits
  • Manual torque limits and robustness requirements; actuator‑driven valve exceptions allowed with appropriate testing.
• Testing
  • Production tests per applicable product standards (often EN 12266‑1/‑2).
  • Type tests include strength test (partially open; 4×PN for PN<100, 2.25× for higher), cryogenic leak tightness, and operation simulation.
  • Cryogenic leak limits (standard values): external leak < 14 mm³/s (10 mm³/s for flammable service); internal leak limits quoted in the standard as less than 1000 mm³/s × DN (1 l/s × DN).
  • Operation simulation: 2 000 cycles at specified minimum temperature for category A valves (100 cycles for category B), followed by re‑testing and inspection.
• Cleanliness and marking
  • Cleanliness per EN 12300; marking per EN 19 plus specified minimum temperature.

Applications and Users

• Intended for manufacturers, designers, test houses and QA teams who specify or produce cryogenic valves for industrial gas plants, research facilities, cryogenic storage and transport systems (excluding LNG safety valves).
• Useful to procurement, engineering and regulatory compliance staff selecting valves rated to a pressure class (PN/Class) matching equipment PS and requiring documented cryogenic performance.

Related Standards

• EN 12266‑1 / EN 12266‑2 (valve testing)
• EN 12300 (cleanliness for cryogenic service)
• EN 1251‑1, EN 1252‑1 (cryogenic vessel fundamentals and material toughness)
• EN 12516‑1/‑2/‑4 (valve shell design)
• EN 1797 (gas/material compatibility)
• EN 19 (valve marking), EN 1092‑1, EN 1759‑1, EN ISO 6708

EN 1626:2008 is a practical, prescriptive reference for ensuring valves operate reliably and safely under cryogenic conditions and for demonstrating compliance during design, production and acceptance testing.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kryo Behälter - Absperrarmaturen für tiefkalten BetriebRécipients cryogéniques - Robinets pour usage cryogéniqueCryogenic vessels - Valves for cryogenic service23.060.01Ventili na splošnoValves in general23.020.40Proti mrazu odporne posode (kriogenske posode)Cryogenic vesselsICS:Ta slovenski standard je istoveten z:EN 1626:2008SIST EN 1626:2009en,fr,de01-april-2009SIST EN 1626:2009SLOVENSKI
STANDARDSIST EN 1626:20011DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1626November 2008ICS 23.020.40; 23.060.01Supersedes EN 1626:1999
English VersionCryogenic vessels - Valves for cryogenic serviceRécipients cryogéniques - Robinets pour usagecryogéniqueKryo Behälter - Absperrarmaturen für tiefkalten BetriebThis European Standard was approved by CEN on 13 September 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1626:2008: ESIST EN 1626:2009

Recommended methods for leak tightness testing of cryogenic valves . 10 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EC Directive 97/23/EC (PED) . 12
Foreword This document (EN 1626:2008) has been prepared by Technical Committee CEN/TC 268 “Cryogenic vessels”, 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 May 2009, and conflicting national standards shall be withdrawn at the latest by May 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document will supersede EN 1626:1999. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
It applies to sizes up to DN 150 including vacuum jacketed cryogenic valves. This European Standard is not applicable to safety valves and valves for liquefied natural gas (LNG). It is intended that the valve be designed and tested to satisfy a pressure rating (PN or Class). Valves may then be selected with a PN or Class equal to or greater than the maximum allowable pressure (PS) of the equipment with which it is to be used. 2 Normative references The following referenced documents are indispensable for the application 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. EN 19, Industrial valves - Marking of metallic valves EN 736-1, Valves - Terminology - Part 1: Definition of types of valves EN 736-2, Valves - Terminology - Part 2: Definition of components of valves EN 736-3, Valves - Terminology - Part 3: Definition of terms EN 1092-1, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges EN 1251-1, Cryogenic vessels - Transportable vacuum insulated vessels of not more than 1000 litres volume – Part 1: Fundamental requirements EN 1252-1, Cryogenic vessels - Materials - Part 1: Toughness requirements for temperatures below - 80 °C EN 1333, Flanges and their joints - Pipework components - Definition and selection of PN EN 1759-1, Flanges and their joint – Circular flanges for pipes, valves, fittings and accessories, Class designated – Part 1: Steel flanges, NPS ½ to 24 EN 1797, Cryogenic vessels - Gas/material compatibility
EN 12266-1, Industrial valves - Testing of valves - Part 1: Pressure tests, test procedures and acceptance criteria - Mandatory requirements EN 12266-2, Industrial valves - Testing of valves - Part 2: Tests, test procedures and acceptance criteria - Supplementary requirements EN 12300, Cryogenic vessels - Cleanliness for cryogenic service EN 12516-1, Industrial valves – Shell design strength – Part 1: Tabulation method for steel valve shells EN 12516-2, Industrial valves - Shell design strength - Part 2: Calculation method for steel valve shells EN 12516-4, Industrial valves – Shell design strength – Part 4: Calculation method for valve shells manufactured in metallic materials other than steel SIST EN 1626:2009

either nominal pressure (PN) as defined in accordance with EN 1333 and EN 1092-1 or Class rating as defined in EN 1759-1 3.3 specified minimum temperature lowest temperature the valve is specified for 3.4 valve category A valves intended to be operated with normal frequency (above 20 cycles a year)
3.5 valve category B valves intended to be operated only occasionally i.e. with a frequency below 20 cycles a year
4 Requirements 4.1 Materials 4.1.1 Metallic materials Metallic materials to be used in the construction of cryogenic valves shall be suitable for general valve uses as defined in EN 12516-1, EN 12516-2 and EN 12516-4. In addition, the following requirements apply: 4.1.1.1 Toughness requirements Materials which exhibit a ductile/brittle transition shall have minimum impact test values specified in EN 1252-1. These requirements apply only to the critical parts of the valve exposed to cryogenic temperatures (and not to control elements for example). Non ferrous materials which can be shown to have no ductile/brittle transition do not require additional impact tests. 4.1.1.2 Corrosion resistance Materials shall be resistant to or protected from normal atmospheric corrosion and to the medium handled. 4.1.1.3 Oxygen compatibility If the specified minimum temperature is equal to or below the boiling point of air (approximately – 190 °C at atmospheric pressure) or the valve is intended for oxygen service the materials which are, or likely to be, in contact with oxygen or an oxygen enriched air shall be oxygen compatible in accordance with EN 1797.
4.1.1.4 Flammable gas compatibility For hydrogen service, see EN 1797. SIST EN 1626:2009
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