EN 1626:2008

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

500 x R Nm. For a hand-wheel, R is the radius of the wheel in meters. For a lever R is the length of the lever in meters minus 0,05 m. The valve shall be robust enough to withstand 1000 R N.m or equivalent in linear force as specified above without damage. A lower value is permitted if there is a limiting torque or stroke device. Stems/shafts torsional strength within the pressure boundary shall be designed to exceed the torsional strength of the stem/shaft to the packing by at least 10 %. Valves intended for actuator operation may have torque or linear force requirements deviating from the above. The sample valve tests shall then be performed including a proper actuator to operate the valve. 4.2.10 Electrical continuity and explosion proofness All valves shall have a maximum electrical resistance of 1000 Ω in order to ensure electrical continuity to prevent build-up of static electricity. For flammable fluids, any equipment attached to or associated with a valve shall be suitable for the hazard zone. 5 Testing 5.1 Production tests The production test shall be performed in accordance with the requirements of applicable valve product standards. If these standards refer to EN 12266-1 and EN 12266-2, closure test leakage rate A is required.
5.2 Type testing 5.2.1 Selection of sample valves One sample valve shall be tested. It shall be representative of the valves to be produced. If a range of valves of identical design but with different size is to be tested, one sample of the smallest and one sample of the largest shall be tested. 5.2.2 Verification of the design
A second sample valve shall be inspected to ensure that the
...