Helium cryostats - Protection against excessive pressure

This document specifies the minimum requirements for the protection of helium cryostats against excessive pressure rise, including the specific risks associated with cryostats for superconducting magnets and cryostats for superconducting radio-frequency cavities, coldboxes of helium refrigerators and liquefiers as well as helium distribution systems including valve boxes. It includes information on risk assessment, protection concepts, dimensioning of pressure relief devices, types of pressure relief devices, substance release and operation of helium cryostats.
In order to fulfil the aim of this document, the characteristics of pressure relief devices are taken into account.

Helium-Kryostate - Schutz gegen Drucküberschreitung

Dieses Dokument legt die Mindestanforderungen für den Schutz von Helium-Kryostaten gegen unzulässigen Druckanstieg fest, einschließlich der spezifischen Risiken im Zusammenhang mit Kryostaten für supraleitende Magnete und Kryostaten für supraleitende Hochfrequenz-Kavitäten, Coldboxen von Helium-Kühlgeräten und -Verflüssigern sowie Helium-Verteilersystemen einschließlich Ventilboxen. Es umfasst Informationen zur Gefährdungsbeurteilung, zu Schutzkonzepten, zur Dimensionierung von Druckentlastungseinrichtungen, zu Bauarten von Druckentlastungseinrichtungen, zur Stofffreisetzung und zum Betrieb von Helium-Kryostaten.
Um den Zweck dieses Dokuments zu erfüllen, werden die Charakteristiken von Druckentlastungs-einrichtungen berücksichtigt.

Cryostats pour hélium - Protection contre les surpressions

Le présent document spécifie les exigences minimales applicables à la protection des cryostats hélium contre les augmentations excessives de pression, ceci inclut les risques spécifiques associés aux cryostats comportant : des aimants supraconducteurs ; des cavités radiofréquence supraconductrices. Il s'applique aux boîtes froides de réfrigérateurs et liquéfacteurs d'hélium, ainsi qu'aux systèmes de distribution d'hélium, notamment les boîtes à vannes et plus généralement aux cryostats. Il inclut des informations sur l'évaluation du risque, les concepts de protection, le dimensionnement des organes de sécurité contre les surpressions, les différents types d'organes de sécurité, la décharge de l'hélium en situation accidentelle et le fonctionnement des cryostats hélium.
En conformité avec son objet, le présent document traite des caractéristiques des organes de sécurité contre les surpressions.

Kriostati za helij - Zaščita pred prekoračitvijo tlaka

Ta dokument določa minimalne zahteve za zaščito kriostatov za helij pred prekoračitvijo tlaka, vključno s posebnimi tveganji, ki so povezana s kriostati za superprevodne magnete in kriostati za superprevodne radiofrekvenčne votline, opremo »coldbox« za helijeve hladilne enote in naprave za utekočinjenje helija ter sisteme za distribucijo helija, vključno z ohišji ventilov. Vključuje oceno tveganja, koncepte zaščite, dimenzije tlačnih varnostnih naprav, vrste tlačnih varnostnih naprav, izpust snovi in delovanje kriostatov za helij.
Za namene izpolnitve cilja tega dokumenta so upoštevane značilnosti tlačnih varnostnih naprav.

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SIST EN 17527:2022
Kriostati za helij - Zaščita pred prekoračitvijo tlaka
Helium cryostats - Protection against excessive pressure
Helium Kryostate - Schutz gegen Drucküberschreitung
Cryostats pour hélium - Protections contre les surpressions
Ta slovenski standard je istoveten z: EN 17527:2021
13.240 Varstvo pred previsokim Protection against excessive
tlakom pressure
23.020.40 Proti mrazu odporne posode Cryogenic vessels
(kriogenske posode)
SIST EN 17527:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 17527:2022

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SIST EN 17527:2022

EN 17527


December 2021
ICS 13.240; 23.020.40
English Version

Helium cryostats - Protection against excessive pressure
Cryostats pour hélium - Protection contre les Helium Kryostate - Schutz gegen Drucküberschreitung
This European Standard was approved by CEN on 15 November 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

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.



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 17527:2021 E
worldwide for CEN national Members.

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SIST EN 17527:2022
EN 17527:2021 (E)
Contents Page
European foreword . 6
Introduction . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Symbols . 14
5 Process flow-charts . 18
5.1 Process flow-chart concerning risk assessment and protection concepts . 18
5.2 Process flow-chart concerning scenario-specific dimensioning of helium circuit PRD
. 20
6 Risk assessment . 21
6.1 General information on risk assessment . 21
6.2 Sources of excessive pressure rise relevant for dimensioning . 21
6.2.1 Loss of insulating vacuum . 21
6.2.2 Loss of beamline vacuum . 21
6.2.3 Quench of superconducting device . 21
6.2.4 Leak of cryogenic fluid .

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