SIST EN 14620-5:2025
(Main)Design and manufacture of site built, vertical, cylindrical, flat-bottomed tank systems for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and -196 °C - Part 5: Testing, drying, purging and cool-down
Design and manufacture of site built, vertical, cylindrical, flat-bottomed tank systems for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and -196 °C - Part 5: Testing, drying, purging and cool-down
This document is applicable to the design and manufacture of site built, vertical, cylindrical, flat-bottomed tank systems for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and –196°C. It specifies the requirements for testing, drying, purging, cool-down and decommissioning of refrigerated liquefied gas storage tank systems.
The tank systems covered by this document are used to store large volumes of hydrocarbon products, ammonia and other non-hydrocarbon gases with low temperature boiling points, generally called “Refrigerated Liquefied Gases” (RLGs). Typical products stored in the tank systems are: methane, ethane, propane, butane, ethylene, propylene, butadiene (this range includes Liquefied Natural Gas (LNG) and Liquefied Petroleum Gas (LPG), ammonia, nitrogen, oxygen and argon.
NOTE Properties of the gases are given in Annex A EN 14620-1:2024.
This document provides requirements and specifies measures to be taken following completion of major tank construction activities and before the tank is brought in to service. It provides requirements for full-height and partial height hydrostatic testing to check the structural integrity of tanks and the capacity of the foundations. Settlement monitoring of the foundations at this stage form the starting point of an annual settlement monitoring programme for the tank foundation. Recommendations are given for marker systems for such monitoring. Requirements for water quality of both fresh water and seawater used during hydrotest, are provided to avoid the risk of corrosion of tanks and appurtenances.
Guidance and requirements for positive and negative pneumatic tests to further check tank structural integrity, leak tightness of welds and the function of pressure and vacuum relief valve systems are also given. Requirements specific to testing of double wall and membrane type tanks is included.
Rules and procedures for commissioning activities, including drying and purging with inert and product gas are provided, including required oxygen concentrations for various RLG’s. The document also provides guidance for cool-down procedures and suggestions for temperature monitoring, including an informative Annex A.
For major maintenance inspection or at the end of the life of the tank, decommissioning will be required. Guidance on safe decommissioning processes is provided.
Suggested procedures for Global testing for membrane tanks are provided in informative Annex B
This document is applicable to the design and manufacture of site built, vertical, cylindrical, flat-bottomed tank systems for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and -196°C.
Auslegung und Herstellung standortgefertigter, stehender, zylindrischer Flachboden-Tanksysteme für die Lagerung von tiefkalt verflüssigten Gasen bei Betriebstemperaturen zwischen 0 °C und -196 °C – Teil 5: Prüfen, Trocknen, Inertisieren und Kaltfahren
Dieses Dokument ist für die Auslegung und Herstellung standortgefertigter, stehender, zylindrischer Flachboden-Tanksysteme für die Lagerung von tiefkalt verflüssigten Gasen bei Betriebstemperaturen zwischen 0 °C und −196 °C anwendbar. Es legt Anforderungen an das Prüfen, Trocknen, Inertisieren, Kaltfahren und die Außerbetriebnahme von Tanks für die Lagerung von tiefkalt verflüssigten Gasen fest.
Die in diesem Dokument behandelten Tanksysteme werden zur Lagerung großer Mengen von Kohlenwasserstoffprodukten, Ammoniak und anderen Nicht-Kohlenwasserstoffgasen mit niedrigen Siedepunkten verwendet, die im Allgemeinen als „tiefkalt verflüssigte Gase“ (RLG, en: refrigerated liquefied gases) bezeichnet werden. Übliche in Tanksystemen gelagerte Lagergüter sind: Methan, Ethan, Propan, Butan, Ethylen, Propylen, Butadien (dazu gehören auch verflüssigtes Erdgas (LNG, en: liquefied natural gas) und Flüssiggas (LPG, en: liquefied petroleum gas), Ammoniak, Stickstoff, Sauerstoff und Argon.
ANMERKUNG Die Eigenschaften der Gase sind in EN 14620 1:2024, Anhang A, angegeben.
Dieses Dokument enthält Anforderungen und legt Maßnahmen fest, die nach Abschluss größerer Bautätigkeiten am Tank und vor der Inbetriebnahme des Tanks zu treffen sind. Es enthält Anforderungen für die Wasserprobe in voller Höhe und in reduzierter Höhe, um die Unversehrtheit der Konstruktion von Tanks und die Tragfähigkeit der Gründung zu überprüfen. Die Überwachung zur Setzung von Gründungen in dieser Phase stellen den Beginn eines jährlichen Überwachungsprogramms zur Setzung an der Gründung des Tanks dar. Es werden Empfehlungen für Messmarken für eine solche Überwachung gegeben. Es werden Anforderungen an die Wassergüte von frischem Wasser und Meerwasser gestellt, die während der Wasserprobe verwendet werden, um das Risiko der Korrosion von Tanks und Zubehör zu vermeiden.
Es werden auch Anleitungen und Anforderungen für die Überdruck- und Unterdruckprüfung zur weiteren Überprüfung der Unversehrtheit der Konstruktion von Tanks, der Dichtheit von Schweißnähten und der Funktion von (Unterdruck-)Sicherheitsventilen angegeben. Es werden auch spezifische Anforderungen an die Prüfung von doppelwandigen Tanks und Membrantanks gestellt.
Es werden Regeln und Verfahren für die Inbetriebnahme, einschließlich Trocknen, Inertisieren mit Inert- und Lagergutgas, angegeben, einschließlich erforderlicher Sauerstoffkonzentrationen für verschiedene RLG. Das Dokument enthält auch Anleitungen für Kaltfahrverfahren und Vorschläge für die Überwachung der Temperatur, einschließlich eines informativen Anhang A.
Bei größeren Wartungsinspektionen oder am Ende der Lebensdauer des Tanks ist eine Außerbetriebnahme erforderlich. Es werden Leitlinien für sichere Außerbetriebnahmevorgänge angegeben.
Vorgeschlagene Verfahren für umfassende Prüfungen von Membrantanks sind im informativen Anhang B angegeben.
Dieses Dokument ist anwendbar für die Auslegung und Herstellung standortgefertigter, stehender, zylindrischer Flachboden-Tanksysteme für die Lagerung von tiefkalt verflüssigten Gasen bei Betriebstemperaturen von 0 °C bis −196 °C.
Conception et fabrication de réservoirs cylindriques fond plat, verticaux, construits sur site, destinés au stockage des gaz réfrigérés, liquéfiés, dont les températures de service sont comprises entre 0 °C et -196 °C - Partie 5 : Essais, séchage, inertage et mise en froid
Le présent document spécifie les exigences relatives aux essais, séchage, inertage, mise en froid et mise hors service des réservoirs de stockage de gaz liquéfiés réfrigérés.
Le présent document traite de la conception et de la fabrication de réservoirs cylindriques fond plat, verticaux, construits sur site, destinés au stockage des gaz réfrigérés, liquéfiés, dont les températures de service sont comprises entre 0 °C et -196 °C.
Konstruiranje in proizvodnja na mestu postavitve grajenih navpičnih, valjastih jeklenih posod z ravnim dnom za shranjevanje hlajenih utekočinjenih plinov z delovnimi temperaturami med 0 °C in –196 °C - 5. del: Preskušanje, sušenje, inertizacija in ohlajanje
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2025
Nadomešča:
SIST EN 14620-5:2007
Konstruiranje in proizvodnja na mestu postavitve grajenih navpičnih, valjastih
jeklenih posod z ravnim dnom za shranjevanje hlajenih utekočinjenih plinov z
delovnimi temperaturami med 0 °C in –196 °C - 5. del: Preskušanje, sušenje,
inertizacija in ohlajanje
Design and manufacture of site built, vertical, cylindrical, flat-bottomed tank systems for
the storage of refrigerated, liquefied gases with operating temperatures between 0 °C
and -196 °C - Part 5: Testing, drying, purging and cool-down
Auslegung und Herstellung standortgefertigter, stehender, zylindrischer Flachboden-
Tanksysteme für die Lagerung von tiefkalt verflüssigten Gasen bei Betriebstemperaturen
zwischen 0 °C und -196 °C – Teil 5: Prüfen, Trocknen, Inertisieren und Kaltfahren
Conception et fabrication de réservoirs cylindriques fond plat, verticaux, construits sur
site, destinés au stockage des gaz réfrigérés, liquéfiés, dont les températures de service
sont comprises entre 0 °C et -196 °C - Partie 5 : Essais, séchage, inertage et mise en
froid
Ta slovenski standard je istoveten z: EN 14620-5:2025
ICS:
23.020.10 Nepremične posode in Stationary containers and
rezervoarji tanks
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 14620-5
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2025
EUROPÄISCHE NORM
ICS 23.020.10 Supersedes EN 14620-5:2006
English Version
Design and manufacture of site built, vertical, cylindrical,
flat-bottomed tank systems for the storage of refrigerated,
liquefied gases with operating temperatures between 0 °C
and -196 °C - Part 5: Testing, drying, purging and cool-
down
Conception et fabrication de réservoirs cylindriques Auslegung und Herstellung standortgefertigter,
fond plat, verticaux, construits sur site, destinés au stehender, zylindrischer Flachboden-Tanksysteme für
stockage des gaz réfrigérés, liquéfiés, dont les die Lagerung von tiefkalt verflüssigten Gasen bei
températures de service sont comprises entre 0 °C et - Betriebstemperaturen zwischen 0 °C und -196 °C - Teil
196 °C - Partie 5 : Essais, séchage, inertage et mise en 5: Prüfen, Trocknen, Inertisieren und Kaltfahren
froid
This European Standard was approved by CEN on 27 July 2025.
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, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14620-5:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 6
4 Hydrostatic and pneumatic testing . 6
4.1 Hydrostatic test . 6
4.1.1 General. 6
4.1.2 Test requirements for each type of tank . 6
4.1.3 Additional requirements. 7
4.1.4 Quality of the water . 8
4.1.5 Conditions of implementation . 10
4.1.6 Examination related to hydrostatic testing . 10
4.1.7 Filling and emptying . 11
4.1.8 Post emptying cleaning . 11
4.2 Pneumatic test . 11
4.2.1 General. 11
4.2.2 Positive pressure test . 11
4.2.3 Negative pressure test. 12
4.2.4 Empty checks . 13
4.2.5 Double-wall double-roof tank systems . 13
4.3 Specific requirements for membrane tank testing . 14
4.3.1 Hydrostatic test . 14
4.3.2 Positive and negative pneumatic pressure tests . 15
4.3.3 Global Test . 16
5 Commissioning . 16
5.1 General. 16
5.2 Procedures . 17
5.3 Drying . 17
5.4 Purging . 18
5.4.1 Purging with inert gas . 18
5.4.2 Purging with product gas . 18
5.5 Cool-down . 18
5.6 Completion of commissioning activities . 19
6 Decommissioning . 19
Annex A (informative) Cool-down of the primary liquid container/membrane . 21
A.1 General. 21
A.2 Cool-down rates . 21
A.2.1 Inner Tank . 21
A.2.2 Membrane . 21
Annex B (informative) Global test for membrane tanks . 22
B.1 General. 22
B.2 Intermediate monitoring . 22
B.3 Test Phases . 22
B.3.1 Concrete outer tank . 22
B.3.2 Steel outer tank . 23
Annex C (informative) Guidance for duties and responsibilities between parties . 25
Annex D (normative) Requirements for non-destructive examinations (NDE) of steel
containers supplementary to Table 14 EN 14620-2:2006 . 26
D.1 For steel primary containers . 26
D.2 For steel secondary containers. 26
D.3 For steel membrane tank outer containers . 26
D.3.1 Hydrotested prior to Membrane installation . 26
D.3.2 Hydrotested after Membrane installation . 26
Bibliography . 28
European foreword
This document (EN 14620-5:2025) has been prepared by Technical Committee CEN/TC 265 “Metallic
tanks for the storage of liquids”, the secretariat of which is held by BSI.
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 April 2026, and conflicting national standards shall be
withdrawn at the latest by April 2026.
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 14620-5:2006.
— Table 1 ‘Hydrostatic test requirements’ updated and adjusted to relate to product temperature;
— product temperature range extended to −196°C to include LIN, LOX and LAR;
— permitted use of small temporary safety opening in primary steel liquid container after hydrostatic
test added;
— requirements for inspection of concrete surfaces during pressure test added;
— negative pressure test details clarified;
— negative pressure test requirements for double-wall double-roof tanks clarified;
— purging of bottom insulation space clarified;
— decommissioning guidance improved;
— new informative annex for global test for membrane tanks added;
— new informative annex for guidance for duties and responsibilities between parties added;
— new normative annex for NDE of steel containers supplementary to EN 14620-Part 2:2006.
A list of all parts in the EN 14620 series, “Design and manufacture of site built, vertical, cylindrical, flat-
bottomed tank systems for the storage of refrigerated, liquefied gases with operating temperatures between
0 °C and −196 °C”, can be found on the CEN website.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Türkiye and the United
Kingdom.
1 Scope
This document is applicable to the design and manufacture o
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