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

Status
Published
Public Enquiry End Date
30-Jun-2016
Publication Date
17-Apr-2017
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
10-Mar-2017
Due Date
15-May-2017
Completion Date
18-Apr-2017

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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
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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

worldwide for CEN national Members.
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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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SIST EN ISO 20421-2:2017
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

modification.
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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
CH-1214 Vernier, Geneva, Switzerland
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

© ISO 2017 – All rights reserved iii
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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.
iv © ISO 2017 – All rights reserved
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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
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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 testing
3 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 use

Note 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 check
3.3
withdrawal

operation by which the product is taken from a vessel connected to the supply system

© ISO 2017 – All rights reserved 1
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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 present
3.5
underground

area or room whose ground or floor is on all sides significantly lower than the adjacent ground surfaces

3.6
large 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 parts

Note 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”.

3.7
authorized 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

3.12
holding 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 labelling
4.2.1 Marking

Marking shall be in accordance with the applicable design standard and/or regulations, e.g. ISO 20421-1.

2 © ISO 2017 – All rights reserved
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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,
© ISO 2017 – All rights reserved 3
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SIST EN ISO 20421-2:2017
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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SIST EN ISO 20421-2:2017
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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