SIST EN ISO 20421-2:2017
(Main)Cryogenic vessels - Large transportable vacuum-insulated vessels - Part 2: Operational requirements (ISO 20421-2:2017)
Cryogenic vessels - Large transportable vacuum-insulated vessels - Part 2: Operational requirements (ISO 20421-2:2017)
This European Standard applies to operational requirements for large transportable vacuum insulated cryogenic vessels of more than 1000 litres volume. The scope includes putting into service, filling, withdrawal, transport within the location, maintenance, periodic inspection and emergency procedures. Operational requirements for usage these vessels on public roads, rail, sea and air are not covered. For the transportation of these vessels by public road, rail, sea and air, other requirements apply; these are defined in specific regulations. The standard applies to vessels for cryogenic fluids as specified in WI 004.
Kryo-Behälter - Große ortsbewegliche vakuumisolierte Behälter - Teil 2: Betriebsanforderungen (ISO 20421-2:2017)
Récipients cryogéniques - Grands récipients transportables, isolés, sous vide - Partie 2: Exigences de fonctionnement (ISO 20421-2:2017)
ISO 20421-2:2017 spécifie les exigences de fonctionnement relatives aux grands récipients cryogéniques transportables isolés sous vide.
Ces exigences de fonctionnement concernent la mise en service, le remplissage, le soutirage, le transport à l'intérieur du site, le stockage, la maintenance, les contrôles périodiques et les procédures d'urgence.
Pour le transport de ces récipients par route, rail, voie navigable, mer ou air, des exigences supplémentaires peuvent s'appliquer; celles-ci sont définies dans des réglementations spécifiques.
Kriogene posode - Velike premične, vakuumsko izolirane posode - 2. del: Zahteve za obratovanje (ISO 20421-2:2017)
Ta evropski standard se uporablja za delovne zahteve za velike premične vakuumsko izolirane kriogene posode s prostornino, večjo od 1000 litrov. Na področje uporabe standarda spada zagon, polnjenje, odstranitev iz uporabe, transport znotraj lokacije, vzdrževanje, redni pregledi in postopki ravnanja v sili. Zahteve za obratovanje za uporabo teh posod na javnih cestah, železnici, na morju in v zraku niso zajete v tem standardu. Za transport teh posod po javni cesti, železnici, morju in zraku se uporabljajo druge zahteve, ki so določene v posebnih predpisih. Standard se uporablja za posode za kriogene tekočine, kot je določeno v dokumentu WI 004.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 20421-2:2017
01-maj-2017
1DGRPHãþD
SIST EN 13530-3:2002
SIST EN 13530-3:2002/A1:2005
.ULRJHQHSRVRGH9HOLNHSUHPLþQHYDNXXPVNRL]ROLUDQHSRVRGHGHO=DKWHYH
]DREUDWRYDQMH,62
Cryogenic vessels - Large transportable vacuum-insulated vessels - Part 2: Operational
requirements (ISO 20421-2:2017)Kryo-Behälter - Große ortsbewegliche vakuumisolierte Behälter - Teil 2:
Betriebsanforderungen (ISO 20421-2:2017)
Récipients cryogéniques - Grands récipients transportables, isolés, sous vide - Partie 2:
Exigences de fonctionnement (ISO 20421-2:2017)Ta slovenski standard je istoveten z: EN ISO 20421-2:2017
ICS:
23.020.40 Proti mrazu odporne posode Cryogenic vessels
(kriogenske posode)
SIST EN ISO 20421-2:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 20421-2:2017
EN ISO 20421-2
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2017
EUROPÄISCHE NORM
ICS 23.020.40 Supersedes EN 13530-3:2002
English Version
Cryogenic vessels - Large transportable vacuum-insulated
vessels - Part 2: Operational requirements (ISO 20421-
2:2017)
Récipients cryogéniques - Grands récipients Kryo-Behälter - Große ortsbewegliche vakuumisolierte
transportables, isolés, sous vide - Partie 2: Exigences Behälter - Teil 2: Betriebsanforderungen (ISO 20421-
de fonctionnement (ISO 20421-2:2017) 2:2017)This European Standard was approved by CEN on 15 February 2017.
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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20421-2:2017 E
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SIST EN ISO 20421-2:2017
EN ISO 20421-2:2017 (E)
Contents Page
European foreword ....................................................................................................................................................... 3
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EN ISO 20421-2:2017 (E)
European foreword
This document (EN ISO 20421-2:2017) has been prepared by Technical Committee ISO/TC 220
“Cryogenic vessels” in collaboration with Technical Committee CEN/TC 268 “Cryogenic vessels and
specific hydrogen 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 August 2017, and conflicting national standards shall
be withdrawn at the latest by August 2017.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 supersedes EN 13530-3:2002.
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 20421-2:2017 has been approved by CEN as EN ISO 20421-2:2017 without any
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SIST EN ISO 20421-2:2017
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SIST EN ISO 20421-2:2017
INTERNATIONAL ISO
STANDARD 20421-2
Second edition
2017-02
Cryogenic vessels — Large
transportable vacuum-insulated
vessels —
Part 2:
Operational requirements
Récipients cryogéniques — Grands récipients transportables, isolés,
sous vide —
Partie 2: Exigences de fonctionnement
Reference number
ISO 20421-2:2017(E)
ISO 2017
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SIST EN ISO 20421-2:2017
ISO 20421-2:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
Ch. de Blandonnet 8 • CP 401
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Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
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SIST EN ISO 20421-2:2017
ISO 20421-2:2017(E)
Contents Page
Foreword ........................................................................................................................................................................................................................................iv
Introduction ..................................................................................................................................................................................................................................v
1 Scope ................................................................................................................................................................................................................................. 1
2 Normative references ...................................................................................................................................................................................... 1
3 Terms and definitions ..................................................................................................................................................................................... 1
4 Preliminaries before putting into service .................................................................................................................................. 2
4.1 General ........................................................................................................................................................................................................... 2
4.2 Marking and labelling ....................................................................................................................................................................... 2
4.2.1 Marking .................................................................................................................................................................................... 2
4.2.2 Labelling (or placarding) .......................................................................................................................................... 3
4.3 Handover documents ........................................................................................................................................................................ 3
5 Personnel training .............................................................................................................................................................................................. 3
6 General safety requirements ................................................................................................................................................................... 4
6.1 General ........................................................................................................................................................................................................... 4
6.2 Safety considerations ........................................................................................................................................................................ 4
7 Putting into service ............................................................................................................................................................................................ 5
8 Location ......................................................................................................................................................................................................................... 5
9 Transport ..................................................................................................................................................................................................................... 6
10 Filling ................................................................................................................................................................................................................................ 6
10.1 General ........................................................................................................................................................................................................... 6
10.2 Prefill checks ............................................................................................................................................................................................. 7
10.3 Preparations .............................................................................................................................................................................................. 7
10.4 After-fill check ......................................................................................................................................................................................... 8
11 Product withdrawal ........................................................................................................................................................................................... 8
12 Change of service.................................................................................................................................................................................................. 8
13 Taking out service ............................................................................................................................................................................................... 9
14 Maintenance and repair ................................................................................................................................................................................ 9
15 Periodic inspection .........................................................................................................................................................................................10
16 Additional requirements for flammable gases ..................................................................................................................11
16.1 General safety requirements ....................................................................................................................................................11
16.1.1 General...................................................................................................................................................................................11
16.1.2 Electrical equipment .................................................................................................................................................11
16.1.3 Grounding (earthing) system .............................................................................................................................11
16.2 Putting into service (see also Clause 7) ..........................................................................................................................12
16.3 Location (see also Clause 8) .....................................................................................................................................................12
16.4 Transport (see also Clause 9) ..................................................................................................................................................12
16.5 Filling (see also Clause 10) ........................................................................................................................................................12
16.6 Change of service (see also Clause 12) ............................................................................................................................12
16.7 Taking out of service (see also Clause 13) ...................................................................................................................12
16.8 Maintenance and repair (see also Clause 14)............................................................................................................12
16.9 Emergency equipment and procedures .........................................................................................................................13
Bibliography .............................................................................................................................................................................................................................14
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SIST EN ISO 20421-2:2017
ISO 20421-2:2017(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
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
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 meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www . i so .org/ iso/ foreword .html.
The committee responsible for this document is ISO/TC 220, Cryogenic vessels.This second edition cancels and replaces the first edition (ISO 20421-2:2005), which has been
technically revised.A list of all parts in the ISO 20421 series can be found on the ISO website.
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SIST EN ISO 20421-2:2017
ISO 20421-2:2017(E)
Introduction
Elements of this document support the requirements of the UN-Recommendations on the Transport of
Dangerous Goods and other international, national or local requirements.Large transportable cryogenic vessels are often partly equipped by the manufacturer, but may be
completed or re-equipped by another party, such as the operator or owner. For this reason, some of
the scope of this document, which includes putting into service, inspection, filling, maintenance and
emergency procedures, overlaps with ISO 20421-1.This document applies to vessels for cryogenic fluids, primarily as specified in ISO 20421-1. It may also
be used for vessels for cryogenic fluids manufactured and designed to other standards, e.g. EN 13530-2.
In case of conflict between the requirements of this document with applicable regulations, regulations
take precedence.© ISO 2017 – All rights reserved v
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SIST EN ISO 20421-2:2017
INTERNATIONAL STANDARD ISO 20421-2:2017(E)
Cryogenic vessels — Large transportable vacuum-insulated
vessels —
Part 2:
Operational requirements
1 Scope
This document specifies operational requirements for large transportable vacuum-insulated cryogenic
vessels.These operational requirements include putting into service, filling, withdrawal, transport within the
location, storage, maintenance, periodic inspection and emergency procedures.For the transport of these vessels by public road, rail, waterway, sea and air, additional requirements
can apply; these are defined in specific regulations.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 20421-1, Cryogenic vessels — Large transportable vacuum-insulated vessels — Part 1: Design,
fabrication, inspection and testing3 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
putting into service
operation by which a new vessel being used for the first time or an existing vessel being returned to
service is prepared for useNote 1 to entry: Initial inspections and tests are covered in ISO 20421-1 or similar design standards, e.g.
EN 13530-2.3.2
filling
operation by which a transportable vessel undergoes a prefill check, filling with a cryogenic fluid and
an after-fill check3.3
withdrawal
operation by which the product is taken from a vessel connected to the supply system
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SIST EN ISO 20421-2:2017
ISO 20421-2:2017(E)
3.4
outdoor
location outside of any building or structure and not enclosed by more than two walls or one wall if a
roof is also present3.5
underground
area or room whose ground or floor is on all sides significantly lower than the adjacent ground surfaces
3.6large transportable cryogenic vessel
thermally insulated vessel of more than 450 l intended for the transport of one or more cryogenic fluids,
consisting of an inner vessel, an outer jacket, all of the valves and service equipment together with the
structural partsNote 1 to entry: The large transportable cryogenic vessel comprises a complete assembly that is ready for service.
Note 2 to entry: A “large transportable cryogenic vessel” is hereinafter referred to as “vessel”.
3.7authorized person
person authorized by the applicable regulations
3.8
enterprise
any person or company that has a legal duty of care
3.9
filler
any enterprise which loads cryogenic fluids into a cryogenic vessel
3.10
owner
enterprise that legally owns the cryogenic vessel
3.11
operator
any enterprise for filling, storage, transport and withdrawal of cryogenic product
3.12holding time
time that will elapse from the establishment of the initial filling condition until the pressure has risen
due to heat influx to the lowest set pressure of the pressure limiting device(s)4 Preliminaries before putting into service
4.1 General
Before putting into service, verification shall take place to ensure that the vessel is suitable for the
intended service and that the marking, labelling and handover documents are complete.
4.2 Marking and labelling4.2.1 Marking
Marking shall be in accordance with the applicable design standard and/or regulations, e.g. ISO 20421-1.
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SIST EN ISO 20421-2:2017
ISO 20421-2:2017(E)
4.2.2 Labelling (or placarding)
For labelling, the following shall be affixed:
a) a flow sheet denoting operation;
b) danger labels and marks in accordance with transport regulations;
c) risk and safety phrases associated with the gas content;
d) name of the owner;
e) name of the operator;
f) actual holding time for gases being transported;
g) maximum permissible gross mass;
h) unladen (tare) mass;
i) an unshortened identification of the fluid which is transported in accordance with the transport and
substance regulations and its net mass in accordance with the documentation. As an alternative,
this information can be included in a transport document.NOTE 1 Items a) to i) can appear on the vessel, name plate or transport document depending on the
requirements of the particular transport mode or operator requirements.NOTE 2 Items e) to i) can be required by the design standards and do not need to be repeated.
Specific transport regulations shall always be consulted prior to the carriage. The holding time shall be
calculated for each journey in accordance with applicable transport regulations.4.3 Handover documents
In addition to the manufacturer’s documentation, where necessary, the cryogenic vessel shall be
accompanied by vessel-specific documents and instructions for all items supplied covering the
— operation,— auxiliary equipment, and
— inspection records.
These documents shall be retained by the owner of the vessel.
The operator shall have appropriate instructions available. Such instructions may be attached to the
vessel in a permanent manner, or carried by or available to the operator.5 Personnel training
Only persons trained for the specific task shall be allowed to put into service, fill, handle, operate or
maintain the vessel and its equipment.The training programme shall include
— normal procedures,
— product and hazard identification,
— safe operating limits,
— emergency procedures,
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ISO 20421-2:2017(E)
— physical and chemical properties of the vessel’s content and their effects on the human body,
— personal protection, and— confined spaces entry, if applicable.
Training shall be repeated as necessary to ensure that personnel remain competent. A record should be
maintained which details the training personnel have received.6 General safety requirements
6.1 General
Before any operation, the operator shall ensure that all equipment is free from any obvious damage or
defect which could affect its safe operation.Marking and labelling shall not be removed or defaced.
Consideration shall be given to the product properties and the use of appropriate personal protective
equipment.Parts under pressure shall be disconnected only if they have been previously depressurized.
Leaking valves or connections shall be depressurized before rectification. When this is not possible,
leaking valves under pressure shall be tightened using suitable tools and procedures.
Direct flame or direct intense heat shall never be used to raise the pressure or de-ice frozen components.
All surfaces which may come in contact with the product shall be clean for the intended service. For
cleanliness requirements, see ISO 23208.Outlets, seals and transfer hoses shall be checked to be clean, dry and free from contaminants and
visible defects before connection.Vessels and transfer hoses shall not be modified without proper authorization. It is recommended that
the couplings be attached to the vessels and/or hoses in a manner that prevents unauthorized removal
of the product couplings.Operating valves should be opened and closed slowly.
6.2 Safety considerations
In all operations and training, the following safety considerations shall be taken into account.
— Small amounts of cryogenic fluids will produce large volumes of vaporized gas. Spillage of oxygen can
result in an oxygen-enriched atmosphere; spillage of other cryogenic fluids can result in an oxygen-
deficient atmosphere. Appropriate measures shall be taken for all these cases, e.g. ventilation.
— Because of the possibility of cold embrittlement, cryogenic fluids shall only be used in product
systems with components which are suitable for low temperatures.— Vaporizing cryogenic fluids produce gases that are heavier than air and can accumulate in lower
areas (e.g. pits, trenches).— Because of their extremely low temperatures, cryogenic fluids will produce cold burns when
coming into contact with the skin. Cold burns can also be produced from contact with uninsulated
equipment and piping.— Oxygen enrichment due to liquefaction of ambient air can occur on the cold surfaces of uninsulated
equipment which contains a fluid with a boiling point lower than that of oxygen.4 © ISO 2017 – All rights reserved
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ISO 20421-2:2017(E)
— Consideration should be given to establishing proper safety distances during parking or product
transfer.7 Putting into service
This operation shall follow a written procedure and the results of the steps involved should be recorded
(e.g. in a check list). Such lists should be retained by the operating company.Vessels and accessories shall be visually checked for damage.
The following shall be verified.
— The vessel and accessories are appropriate for the intended service, comply with the flow sheet and
are appropriately marked and labelled; all labels shall be clearly displayed and appropriate for the
product.— A relief device with a set pressure not higher than the maximum allowable working pressure of
the vessel is fitted. Pressure, size and installation shall comply with the documentation. Devices
requiring approval shall be correctly stamped and matching certificates shall be available.
— All valves are operable.— All required checks and tests have been carried out.
Ensure that the vessel and accessories are clean and compatible for the intended service; see ISO 23208
and ISO 21010.The vessel should be purged with an appropriate gas until the gas emerging from the vessel is
sufficiently dry and pure for the intended service.The vessel shall be cooled down according to the manufacturer’s recommendations. Steps shall be
taken to avoid uncontrolled pressure rise due to rapid liquid vaporization. The cool-down gas chosen
shall take into account the risk of solidification.Measuring and controlling devices (level gauge, pressure gauge, etc.) shall be checked for correct
operation and setting.8 Location
The requirements listed in this clause are valid for storage and parking, as well as for other activities
such as filling and withdrawal.— Vessels shall be located in a suitable area such as in the open air or in a sufficiently ventilated
enclosed area, away from sources of heat (welding source, open fire, etc.). Hot work shall be subject
to appropriate safety measures. The area shall be kept appropriately clean and suitable access shall
be provided.— Adequate ventilation shall be provided. In locations at or above ground level, natural ventilation is
generally sufficient, provided that the room is large enough or that the outdoor area is not closely
surrounded by walls. In other circumstances, forced ventilation or other precautions shall be
provided.— Vessels should not be located underground. However, where this is unavoidable, relief device
outlet(s) should be piped to a safe external venting point. As an alternative, appropriate marking
(e.g. indicating the risk of asphyxiation) and sufficient conti...
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