SIST EN ISO 10462:2014
(Main)Gas cylinders - Acetylene cylinders - Periodic inspection and maintenance (ISO 10462:2013)
Gas cylinders - Acetylene cylinders - Periodic inspection and maintenance (ISO 10462:2013)
ISO 10462 specifies requirements for the periodic inspection of acetylene cylinders as required for the transport of dangerous goods and for maintenance in connection with periodic inspection. It applies to acetylene cylinders with and without solvent and with a maximum nominal water capacity of 150 l.
Gasflaschen - Acetylenflaschen - Wiederkehrende Inspektion und Wartung (ISO 10462:2013)
Diese Internationale Norm legt die Anforderungen für die wiederkehrende Inspektion von Acetylenflaschen mit und ohne Lösemittel fest.
Bouteilles à gaz - Bouteilles d'acétylène - Contrôle et entretien périodiques (ISO 10462:2013)
L'ISO 10462:2013 spécifie les exigences relatives au contrôle périodique des bouteilles d'acétylène, comme cela est exigé pour le transport des marchandises dangereuses et pour l'entretien en rapport avec le contrôle périodique. Elle s'applique aux bouteilles d'acétylène avec et sans solvant, d'une contenance en eau nominale maximale de 150 l.
Plinske jeklenke - Jeklenke za acetilen - Periodična kontrola in vzdrževanje (ISO 10462:2013)
ISO 10462 določa zahteve za periodične preglede jeklenk za acetilen, kot se zahteva za prevoz nevarnega blaga, in vzdrževanje v povezavi s periodičnimi pregledi. Velja za jeklenke za acetilen z in brez topil ter z nominalno prostornino vode 150 litrov.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 10462:2014
01-julij-2014
1DGRPHãþD
SIST EN 12863:2002
SIST EN 12863:2002/A1:2006
3OLQVNHMHNOHQNH-HNOHQNH]DDFHWLOHQ3HULRGLþQDNRQWURODLQY]GUåHYDQMH ,62
Gas cylinders - Acetylene cylinders - Periodic inspection and maintenance (ISO
10462:2013)
Gasflaschen - Acetylenflaschen - Wiederkehrende Inspektion und Wartung (ISO
10462:2013)
Bouteilles à gaz - Bouteilles d'acétylène - Contrôle et entretien périodiques (ISO
10462:2013)
Ta slovenski standard je istoveten z: EN ISO 10462:2013
ICS:
23.020.30 7ODþQHSRVRGHSOLQVNH Pressure vessels, gas
MHNOHQNH cylinders
SIST EN ISO 10462:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 10462:2014
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SIST EN ISO 10462:2014
EUROPEAN STANDARD
EN ISO 10462
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2013
ICS 23.020.30 Supersedes EN 12863:2002
English Version
Gas cylinders - Acetylene cylinders - Periodic inspection and
maintenance (ISO 10462:2013)
Bouteilles à gaz - Bouteilles d'acétylène - Contrôle et Gasflaschen - Acetylenflaschen - Wiederkehrende
entretien périodiques (ISO 10462:2013) Inspektion und Wartung (ISO 10462:2013)
This European Standard was approved by CEN on 23 November 2013.
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, 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
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10462:2013 E
worldwide for CEN national Members.
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SIST EN ISO 10462:2014
EN ISO 10462:2013 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 10462:2014
EN ISO 10462:2013 (E)
Foreword
This document (EN ISO 10462:2013) has been prepared by Technical Committee ISO/TC 58 “Gas cylinders”
in collaboration with the Technical Committee CEN/TC 23 “Transportable gas cylinders” 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 June 2014, and conflicting national standards shall be withdrawn at
the latest by June 2014.
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 12863:2002.
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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 10462:2013 has been approved by CEN as EN ISO 10462:2013 without any modification.
3
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SIST EN ISO 10462:2014
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SIST EN ISO 10462:2014
INTERNATIONAL ISO
STANDARD 10462
Third edition
2013-12-15
Gas cylinders — Acetylene cylinders —
Periodic inspection and maintenance
Bouteilles à gaz — Bouteilles d’acétylène — Contrôle et entretien
périodiques
Reference number
ISO 10462:2013(E)
©
ISO 2013
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SIST EN ISO 10462:2014
ISO 10462:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013
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
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Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved
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SIST EN ISO 10462:2014
ISO 10462:2013(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General . 3
4.1 Intervals between periodic inspections . 3
4.2 Requirements for inspection . 3
5 Preparation of the acetylene cylinder . 3
5.1 Depressurization of the acetylene cylinder. 3
5.2 Preparation for external visual inspection . 4
5.3 Removal of the valve . . 4
5.4 Removal of neck/core hole filters . 4
6 Inspection and maintenance . 5
6.1 External visual inspection . 5
6.2 Inspection of the porous material . 5
6.3 Addition of non-monolithic porous material . 6
6.4 Replacement of porous material . 7
6.5 Inspection of fusible plugs . 7
6.6 Inspection of valves . 7
6.7 Inspection of cylinder neck . 7
6.8 Reassembly. 8
7 Cylinder marking and identification . 8
8 Records . 9
9 Rejection and rendering cylinders unserviceable . 9
10 Disposal of unserviceable cylinders . 9
Annex A (informative) Tops of acetylene cylinders containing monolithic porous material .11
Annex B (normative) External visual inspection .14
Annex C (normative) Determination of the top clearance .17
Annex D (normative) Cracks in the porous material .19
Annex E (informative) Rings for indicating the date of the next periodic inspection for
gas cylinders .20
Bibliography .22
© ISO 2013 – All rights reserved iii
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SIST EN ISO 10462:2014
ISO 10462:2013(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. 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. 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 WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 58, Gas cylinders, Subcommittee SC 4, Operational
requirements for gas cylinders.
This third edition cancels and replaces the second edition (ISO 10462:2005), which has been technically
revised.
The following are the main technical modifications.
a) The second edition (ISO 10462:2005) has been revised taking EN 12863 into account; EN 12863 has
been superseded by this third edition.
b) Periodic inspection periods are based on the relevant regulations and do not have to be repeated in
this International Standard, thus also avoiding possible inconsistencies in case periodic inspection
periods are changed in the regulations. Consequently, the former Annex A has been deleted and
relevant information is covered in 4.1.
c) For the removal of the valve, reference to ISO 25760 is included and, consequently, the former
Annex B has been deleted.
d) The external visual inspection has been revised; 6.1 and Annex B (which was Annex C in the second
edition) have been updated accordingly.
e) The inspection of monolithic porous materials with regard to cracking, crumbling or cavitation is
given in greater detail for better clarity. A new Annex C for the determination of the top clearance
has been added.
f) For the inspection of the valve, reference to ISO 22434 is included and, consequently, the former
Annex F has been deleted.
iv © ISO 2013 – All rights reserved
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SIST EN ISO 10462:2014
ISO 10462:2013(E)
Introduction
Acetylene cylinders differ from all other cylinders transporting compressed or liquefied gases in that
they contain a porous material and, normally, a solvent in which the acetylene is dissolved. Acetylene
cylinders that contain a porous material but no solvent are only used for special applications. For periodic
inspections, it is intended that due regard be given to the different types of construction of cylinders and
porous materials. This International Standard should be read considering these differences.
The primary objective of the porous material is to limit an acetylene decomposition, if it is initiated, and
thus prevent a cylinder incident. If some porous material is missing, or if a defect (e.g. a cavity, crack
or void of significant size) exists as a result of breakdown or subsidence of the porous material, the
decomposition could progress at a rate that can cause violent failure of the cylinder accompanied by an
explosion.
The requirements in this International Standard are mainly those specific to acetylene cylinders. The
periodic inspection of acetylene cylinders is to be performed only by competent persons and, in those
jurisdictions requiring it, persons authorized by the regulatory authority.
This International Standard is intended to be used under a variety of national regulatory regimes, but has
been written so that it is suitable for the application of Reference [1]. Attention is drawn to requirements
in the specified relevant national regulations of the country (countries) where the cylinders are intended
to be used that might override the requirements given in this International Standard. Where there is
any conflict between this International Standard and any applicable regulation, the regulation always
takes precedence.
In International Standards, “weight” is equivalent to a force, expressed in Newton. However, in common
parlance (as used in terms defined in this International Standard), “weight” is used as an equivalent of
“mass”, but this practice is deprecated (see ISO 80000-4).
1)
Similarly, the unit “bar” , which is not an SI unit and is deprecated by ISO, is used as an equivalent of
Pascal, the SI unit for pressure. This is because of its universal use in the field of technical gases. Pressure
values in this International Standard are given as gauge pressure (pressure exceeding atmospheric
pressure), unless noted otherwise.
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
© ISO 2013 – All rights reserved v
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SIST EN ISO 10462:2014
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SIST EN ISO 10462:2014
INTERNATIONAL STANDARD ISO 10462:2013(E)
Gas cylinders — Acetylene cylinders — Periodic inspection
and maintenance
1 Scope
This International Standard specifies requirements for the periodic inspection of acetylene cylinders
as required for the transport of dangerous goods and for maintenance in connection with periodic
inspection. It applies to acetylene cylinders with and without solvent and with a maximum nominal
water capacity of 150 l.
NOTE The limitation of 150 l is derived from the definition of cylinder in Reference [1].
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 13341, Gas cylinders — Fitting of valves to gas cylinders
ISO 22434, Transportable gas cylinders — Inspection and maintenance of cylinder valves
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
acetylene cylinder
cylinder manufactured and suitable for the transport of acetylene, containing a porous material (3.6) and
solvent (3.9) (where applicable) for acetylene with a valve and other accessories affixed to the cylinder
Note 1 to entry: When there is no risk of ambiguity, the word “cylinder” is used.
3.2
cylinder shell
empty cylinder manufactured and suitable for receiving and containing a porous
material (3.6) for use as part of an acetylene cylinder (3.1)
3.3
maximum acetylene content
specified maximum weight of acetylene including saturation acetylene (3.8) in an
acetylene cylinder (3.1)
3.4
maximum acetylene charge
maximum acetylene content (3.3) minus the saturation acetylene (3.8)
3.5
periodic inspection body
body responsible for the periodic inspection of acetylene cylinders (3.1)
© ISO 2013 – All rights reserved 1
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SIST EN ISO 10462:2014
ISO 10462:2013(E)
3.6
porous material
single or multiple component material introduced to or formed in the cylinder
shell (3.2) that, due to its porosity, allows the absorption of a solvent/acetylene solution
Note 1 to entry: The porous material can be either
— monolithic, consisting of a solid product obtained by reacting materials or by materials connected together
with a binder, or
— non-monolithic, consisting of granular, fibrous or similar materials without the addition of a binder.
3.7
residual gas
weight of acetylene including the saturation acetylene (3.8) contained in an
acetylene cylinder (3.1) returned for filling
3.8
saturation acetylene
acetylene dissolved in the solvent (3.9) in the acetylene cylinder (3.1) at atmospheric
pressure (1,013 bar) and at a temperature of 15 °C
3.9
solvent
liquid that is absorbed by the porous material (3.6) and is capable of dissolving
and releasing acetylene
Note 1 to entry: The following abbreviated terms are used:
— “A” for acetone;
— “DMF” for dimethylformamide.
3.10
tare
reference weight of the acetylene cylinder (3.1) including the specified solvent
content
Note 1 to entry: The tare is further specified in accordance with the following subclauses.
Note 2 to entry: For acetylene cylinders with solvent, the tare is expressed by indicating either tare S or both,
tare A and tare S. For solvent-free acetylene cylinders, the tare is expressed by indicating tare F. For the tare used
for acetylene cylinders in bundles, see ISO 13088.
3.10.1
tare A
sum of the weights of the empty cylinder shell (3.2), the porous material (3.6), the
specified solvent content, the valve, the coating and the valve guard, where applicable, and all other
parts that are permanently attached to the cylinder when it is presented to be filled
Note 1 to entry: Generally, valve guards are included in the tare and are considered to be permanently attached
(and are not removed when the cylinder is filled). This, however, might not always be the case.
3.10.2
tare S
tare A (3.10.1) plus the weight of the saturation acetylene (3.8)
3.10.3
tare F
tare A (3.10.1) minus the specified solvent content
2 © ISO 2013 – All rights reserved
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SIST EN ISO 10462:2014
ISO 10462:2013(E)
3.11
top clearance
gap between the inside of the cylinder shoulder and the monolithic porous
material
3.12
working pressure
settled pressure at a uniform reference temperature of 15 °C in an acetylene
cylinder (3.1) containing the specified solvent content and the maximum acetylene content (3.3)
4 General
4.1 Intervals between periodic inspections
A cylinder is due for periodic inspection when the periodic inspection interval has elapsed. After that
time the cylinder shall not be filled with acetylene. The regular periodic inspection intervals are given
in the Reference [1], Section 4.1.4, Packing instruction P200, or are specified by national or international
authorities.
However, for acetylene cylinders that are newly filled with porous material, it is recommended to carry
out the first periodic inspection earlier. This first periodic inspection interval is recommended as
follows:
a) non-monolithic porous material: two years;
b) monolithic porous material: three years.
After the first periodic inspection according to either a) or b), the regular periodic inspection interval as
stated in the first paragraph of this subclause applies.
Provided the cylinder has been subjected to normal conditions of use and has not been subjected to
abusive or abnormal conditions rendering the cylinder unsafe, there is no general requirement for the
user to return an acetylene cylinder before the content has been used, even when the periodic inspection
interval has elapsed.
4.2 Requirements for inspection
Before any work is carried out, the relevant information on the acetylene cylinder and its ownership
shall be identified (e.g. from its marking and labelling). Cylinders with illegible or incorrect markings
shall be set aside for further investigation.
Due to the presence of a porous material in the cylinder, neither a pressure test (hydraulic or pneumatic)
nor a visual inspection of the internal surface of the cylinder shell is required by this International
Standard.
5 Preparation of the acetylene cylinder
5.1 Depressurization of the acetylene cylinder
SAFETY PRECAUTIONS — Emptying of the cylinder should be carried out slowly; a typical rate
would be 1/8 of the maximum acetylene content per hour.
Before the periodic inspection, cylinders shall be emptied of gas and depressurized. Cylinders shall be
checked for pressure, both before and after depressurization. Depressurization shall be carried out in
a safe manner with due regard to the characteristics of acetylene. Depressurization shall be carried out
over a period long enough to ensure removal of all acetylene, except saturation acetylene. Precautions
shall be taken because variations in temperature influence the quantity of acetylene that remains
dissolved in the solvent.
© ISO 2013 – All rights reserved 3
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SIST EN ISO 10462:2014
ISO 10462:2013(E)
The absence of a positive pressure reading does not clearly indicate the absence of gas under pressure
due to the possibility of a blocked valve (for information, see ISO 25760). In case of any doubt regarding
the efficiency of the depressurization, the cylinder shall be weighed.
If a cylinder weighs more than the tare stamped on the cylinder, it is not always a clear indication of the
presence of gas under pressure. Some relevant factors that should be considered are a possible excess of
solvent or contamination with water, etc.
If a cylinder weighs less than or equal to the stamped tare, it is not always a clear indication of the
absence of gas under pressure. Some relevant factors that should be considered are a possible solvent
shortage or external corrosion causing a loss of cylinder shell.
5.2 Preparation for external visual inspection
Each cylinder shall be cleaned and have all loose coatings, corrosion products, tar, oil or other foreign
matter removed from its external surface by a suitable method, e.g. by brushing, shot blasting (under
closely controlled conditions to ensure that there is no leakage of acetylene into the brushing or shot-
blasting cabinet), water jet abrasive cleaning, chemical cleaning. Care shall be taken at all times to
avoid damaging the cylinder and pressure relief devices (where fitted) or removing excess amounts of
cylinder wall.
Shot blasting is a process utilizing iron shot of various sizes. It is not to be confused with or referred to
as sand blasting, grit blasting or other more aggressive processes that remove a significant amount of
the base metal or metallic coatings. These more aggressive processes should not be used.
The external visual inspection in accordance with 6.1 may be carried out at this stage.
5.3 Removal of the valve
The valve shall be removed safely. For information, see ISO 25760.
The cylinders should not be left open or without valves longer than necessary for the inspection.
5.4 Removal of neck/core hole filters
Acetylene cylinders usually contain neck filters/core hole packings consisting of filter or metallic gauze
and felts. Neck filters and packing materials placed between the top of the porous material and the
base of the valve stem shall be removed, as appropriate, to enable an adequate inspection of the porous
material in accordance with the inspection requirements of the porous material manufacturer. For
various types of neck filters/core hole packings, see Annex A.
Some porous material manufacturers equip acetylene cylinders containing a monolithic porous material
with wooden plugs, which form an integral part of the porous material. These plugs, which are situated
below the neck filter or gauze arrangement, shall be left intact and not removed for the purpose of the
visual inspection provided the wooden plug is in the correct position permitting the measurement of
the top clearance in accordance with the manufacturer’s instructions. If during a previous inspection
the wooden plug was tampered with, removed by mistake or is not in the correct position, it shall be
replaced with a new one in accordance with the porous material manufacturer’s specification.
Special care shall be taken when removing filters or packing material. Some restrictions at the neck
can hold residual pressure that, if suddenly released, can blow the filter out with some of the porous
material and cause injury.
NOTE The presence of soot on the filters or packing material indicates that a flashback might have occurred.
4 © ISO 2013 – All rights reserved
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SIST EN ISO 10462:2014
ISO 10462:2013(E)
6 Inspection and maintenance
6.1 External visual inspection
The external surface of each cylinder shall be inspected for
a) illegible, incorrect, unauthorized or incorrectly located stamp markings, or unauthorized additions
or modifications,
b) plug or neck inserts, vertical stability, bulges, dents, cracks, cuts, gouges, laminations and excessive
removal of material from the cylinder base,
c) fire
...
SLOVENSKI STANDARD
oSIST prEN ISO 10462:2012
01-oktober-2012
3OLQVNHMHNOHQNH-HNOHQNH]DDFHWLOHQ3HULRGLþQLSUHJOHGLLQY]GUåHYDQMH
Gas cylinders - Acetylene cylinders - Periodic inspection and maintenance (ISO/DIS
10462:2012)
Gasflaschen - Acetylenflaschen - Wiederkehrende Inspektion und Wartung (ISO/DIS
10462:2012)
Bouteilles à gaz - Bouteilles d'acétylène - Contrôles et entretien périodiques (ISO/DIS
10462:2012)
Ta slovenski standard je istoveten z: prEN ISO 10462
ICS:
23.020.30 7ODþQHSRVRGHSOLQVNH Pressure vessels, gas
MHNOHQNH cylinders
oSIST prEN ISO 10462:2012 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 10462:2012
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oSIST prEN ISO 10462:2012
EUROPEAN STANDARD
DRAFT
prEN ISO 10462
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2012
ICS 23.020.30
English Version
Gas cylinders - Acetylene cylinders - Periodic inspection and
maintenance (ISO/DIS 10462:2012)
Bouteilles à gaz - Bouteilles d'acétylène - Contrôles et Gasflaschen - Acetylenflaschen - Wiederkehrende
entretien périodiques (ISO/DIS 10462:2012) Inspektion und Wartung (ISO/DIS 10462:2012)
This draft European Standard is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee
CEN/TC 23.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 10462:2012: E
worldwide for CEN national Members.
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oSIST prEN ISO 10462:2012
prEN ISO 10462:2012 (E)
Contents Page
Foreword .3
2
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oSIST prEN ISO 10462:2012
prEN ISO 10462:2012 (E)
Foreword
This document (prEN ISO 10462:2012) has been prepared by Technical Committee ISO/TC 58 "Gas
cylinders" in collaboration with the Technical Committee CEN/TC 23 “Transportable gas cylinders” the
secretariat of which is held by BSI.
This document is currently submitted to the parallel Enquiry.
Endorsement notice
The text of ISO/DIS 10462:2012 has been approved by CEN as a prEN ISO 10462:2012 without any
modification.
3
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oSIST prEN ISO 10462:2012
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oSIST prEN ISO 10462:2012
DRAFT INTERNATIONAL STANDARD ISO/DIS 10462
ISO/TC 58/SC 4 Secretariat: ANSI
Voting begins on Voting terminates on
2012-05-10 2012-10-10
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Gas cylinders — Acetylene cylinders — Periodic inspection and
maintenance
Bouteilles à gaz — Bouteilles d'acétylène — Contrôles et entretien périodiques
[Revision of second edition (ISO 10462:2005)]
ICS 23.020.30
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for Standardization (ISO), and
processed under the ISO-lead mode of collaboration as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member bodies for a parallel
five-month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments received, will be
submitted to a parallel two-month approval vote in ISO and formal vote in CEN.
To expedite distribution, this document is circulated as received from the committee
secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at
publication stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
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Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
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Contents Page
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General . 3
4.1 Intervals between periodic inspections . 3
4.2 Requirements for inspection . 3
5 Preparation of the acetylene cylinder . 3
5.1 Removal of gas . 3
5.2 Preparation for external visual inspection . 4
5.3 Removal of the valve . 4
5.4 Removal of neck/core hole filters . 4
6 Inspection and maintenance . 5
6.1 External visual inspection . 5
6.2 Examination of the porous material . 5
6.3 Addition of non-monolithic porous materials . 6
6.4 Replacement of the porous material . 7
6.5 Inspection of fusible plugs . 7
6.6 Inspection of valves . 7
6.7 Inspection of cylinder neck . 7
6.8 Reassembly . 8
7 Cylinder marking and identification . 8
8 Records . 9
9 Rejection and rendering cylinders unserviceable . 9
10 Disposal of unserviceable cylinders . 9
Annex A (informative) Periodic inspection intervals . 10
Annex B (informative) Illustration of the top of acetylene cylinders containing monolithic porous
material and tools and clearance gauges . 11
Annex C (normative) Cracks in the porous material . 14
Annex D (informative) Periodic inspection date rings for gas cylinders . 15
Bibliography . 16
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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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 10462 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 4,
Operational requirements for gas cylinders.
This third edition cancels and replaces the second edition (ISO 10462:2005), with the following main technical
revisions:
a) ISO 10462:2005 was revised taking into account EN 12863.
b) For the removal of the valve, reference to ISO 25760 is included and consequently the former Annex B
was deleted.
c) For the external visual inspection, reference to the respective Annex of ISO 6406 (for seamless steel
cylinders), ISO 10460 (for welded steel cylinders) or ISO 10461 (for seamless aluminium-alloy cylinders)
is included and consequently the former Annex C was deleted.
d) The inspection of monolithic porous materials with regard to cracking, crumbling or cavitation is further
detailed in order to be clearer.
e) For the inspection of the valve, reference to ISO 22434 is included and consequently the former Annex F
was deleted.
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Introduction
Acetylene cylinders differ from all other cylinders transporting compressed or liquefied gases in that they
contain a porous material and normally a solvent in which the acetylene is dissolved. Only for some special
applications are acetylene cylinders used that contain only a porous material without solvent used. For the
periodic inspection cycle, due regard is to be given to the different types of construction of cylinders and
porous materials. This International Standard should be read considering these differences.
The primary objective of the presence of the porous material is to limit an acetylene decomposition, should it
be initiated, and thus prevent a cylinder incident. If some porous material is missing, or if a defect (e.g. a
cavity, crack or void of significant size) exists as a result of breakdown or subsidence of the porous material,
then the decomposition could progress at a rate that can cause a violent failure of the cylinder accompanied
by an explosion.
The requirements in this International Standard are mainly those that are specific for acetylene cylinders; for
more general requirements related to the periodic inspection of gas cylinders, reference is made to the
relevant ISO documents.
The periodic inspection of acetylene cylinders is to be performed only by competent persons and, in those
jurisdictions requiring it, persons authorized by the regulatory authority.
Where there is any conflict between this International Standard and any applicable regulation, the regulation
always takes precedence.
In International Standards, weight is equivalent to a force, expressed in Newton. However, in common
parlance (as used in terms defined in this International Standard), the word “weight” continues to be used to
mean “mass”, but this practice is deprecated (ISO 80000-4).
In this International Standard the unit bar is used, due to its universal use in the field of technical gases. It
should, however, be noted that bar is not an SI unit, and that the according SI unit for pressure is Pa.
Pressure values given in this International Standard are given as gauge pressure (pressure exceeding
atmospheric pressure) unless noted otherwise.
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oSIST prEN ISO 10462:2012
DRAFT INTERNATIONAL STANDARD ISO/DIS 10462
Gas cylinders — Acetylene cylinders — Periodic inspection and
maintenance
1 Scope
This International Standard specifies the requirements for the periodic inspection of acetylene cylinders with
and without solvent.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 6406, Gas cylinders — Seamless steel gas cylinders — Periodic inspection and testing
ISO 10460, Gas cylinders — Welded carbon-steel gas cylinders — Periodic inspection and testing
ISO 10461, Gas cylinders — Seamless aluminium-alloy gas cylinders — Periodic inspection and testing
ISO 13341, Gas cylinders — Fitting of valves to gas cylinders
ISO 22434, Transportable gas cylinders — Inspection and maintenance of cylinder valves
ISO 25760, Gas cylinders — Operational procedures for the safe removal of valves from gas cylinders
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
acetylene cylinder
cylinder manufactured and suitable for the transport of acetylene, containing a porous material (3.6) and
solvent (3.9) (where applicable) for acetylene with valve and other accessories affixed to the cylinder
Note 1 to entry: When there is no risk of ambiguity, the word “cylinder” is used.
3.2
cylinder shell
empty cylinder manufactured and suitable for receiving and containing a porous
material (3.6) for use as part of an acetylene cylinder (3.1)
3.3
maximum acetylene content
specified maximum weight of acetylene including saturation gas (3.8) in the cylinder
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3.4
maximum acetylene charge
maximum acetylene content (3.3) minus the saturation gas (3.8)
3.5
periodic inspection body
body responsible for the periodic inspection of acetylene cylinders (3.1)
3.6
porous material
single or multiple component material introduced to or formed in the cylinder shell (3.2)
that, due to its porosity, allows the absorption of a solvent/acetylene solution
Note 1 to entry: The porous material can be either:
— monolithic, consisting of a solid product obtained by reacting materials or by materials connected together with a
binder; or
— non-monolithic, consisting of granular, fibrous or similar materials without the addition of a binder.
3.7
residual gas
weight of acetylene including the saturation gas (3.8) contained in a cylinder returned
for filling
3.8
saturation gas
acetylene that remains dissolved in the solvent (3.9) in the cylinder at atmospheric
pressure (1,013 bar) and at a temperature of 15 °C
3.9
solvent
liquid that is absorbed by the porous material (3.6) and is capable of dissolving and
releasing acetylene
Note 1 to entry: The following abbreviations are used:
— “A” for acetone
— "DMF” for dimethylformamide.
3.10
tare
reference weight of the acetylene cylinder (3.1) including the specified solvent content
Note 1 to entry: Tare is further specified in accordance with the following subclauses.
Note 2 to entry: For cylinders with solvent (3.9), the tare is expressed by indicating either tare S or both tare A and tare
S. For solvent-free acetylene cylinders, the tare is expressed by indicating tare F. For the tare used for cylinders in
bundles, see ISO 13088.
3.10.1
tare A
sum of the weights of the empty cylinder shell (3.2), the porous material (3.6), the
specified solvent content, the valve, the coating and the valve guard, where applicable, and all other parts that
are permanently attached to the cylinder when it is presented to be filled
Note 1 to entry: Generally, valve guards are included in the tare and are considered to be permanently attached (and
are not removed when the cylinder is filled). This, however, might not always be the case.
3.10.2
tare S
tare A (3.10.1) plus the weight of the saturation gas (3.8)
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3.10.3
tare F
tare A (3.10.1) minus the specified solvent content
3.11
total weight
tare A (3.10.1) plus the maximum acetylene content (3.3) or tare S (3.10.2) plus the
maximum acetylene charge (3.4), respectively
Note 1 to entry: For solvent-free cylinders, the total weight is tare F (3.10.3) plus the maximum acetylene content (3.3)
Note 2 to entry: The stamped value can be less than the approved value.
3.12
working pressure
settled pressure at a uniform reference temperature of 15 °C in an acetylene
cylinder (3.1) containing the specified solvent content and the maximum acetylene content (3.3)
4 General
4.1 Intervals between periodic inspections
A cylinder is due for periodic inspection on its first receipt by a filler after the expiry of the interval in
accordance with the requirements of the UN Model Regulations 1 or as specified by national or international
authorities (see Annex A).
However, an additional first periodic inspection for cylinders that are newly filled with porous material is
recommended as follows:
a) Non-monolithic porous material: 2 years;
b) Monolithic porous material: 3 years.
After the first periodic inspection according to either a) or b), the normal period as stated in Annex A should
apply.
Provided the cylinder has been subjected to normal conditions of use and has not been subjected to abusive
or abnormal conditions rendering the cylinder unsafe, there is no general requirement for the user to return a
gas cylinder before the content has been used, even though the inspection interval could have lapsed.
4.2 Requirements for inspection
Due to the presence of a porous material in the cylinder, neither a pressure test (hydraulic or pneumatic) nor a
visual inspection of the internal surface of the cylinder shell is required by this International Standard.
5 Preparation of the acetylene cylinder
5.1 Removal of gas
SAFETY PRECAUTIONS — Emptying of the cylinder should be carried out slowly; a typical period
would be 1/8 of the maximum acetylene content per hour.
Before proceeding with the inspection, cylinders shall be depressurized of gas. Cylinders shall be checked for
pressure, both before and after depressurization. Depressurization shall be carried out in a safe manner
having due regard to the characteristics of acetylene. Depressurization shall be carried out over a period long
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enough to ensure removal of all acetylene, except saturation gas. Precautions shall be taken because
variations in temperature influence the quantity of acetylene contained in the form of saturation gas.
The absence of a positive pressure reading does not clearly indicate the absence of excess gas due to the
possibility of a blocked valve (see e.g. ISO 25760). In case of any doubts regarding the efficiency of the
depressurization cycle, the cylinder shall be weighed.
If a cylinder weighs more than the tare stamped on the cylinder, it is not always a clear indication of the
presence of excess gas. Some relevant factors that should be considered are a possible excess of solvent or
contamination with water, etc.
If a cylinder weighs less than or equal to the stamped tare, it is not always a clear indication of the absence of
gas under pressure. Some relevant factors that should be considered are a possible solvent shortage or
external corrosion causing a loss of cylinder shell.
5.2 Preparation for external visual inspection
Each cylinder shall be cleaned and have all loose coatings, corrosion products, tar, oil or other foreign matter
removed from its external surface by a suitable method, e.g. by brushing, shot blasting (under closely
controlled conditions to ensure that there is no leakage of acetylene into the brushing or shot-blasting cabinet),
water jet abrasive cleaning, chemical cleaning or other suitable methods. Care shall be taken at all times to
avoid damaging the cylinder and pressure relief devices (where fitted) or removing excess amounts of cylinder
wall.
The external visual inspection in accordance with 6.1 may be carried out at this stage.
Shot blasting is a process utilizing iron shot of various sizes. It is not to be confused with or referred to as
sand blasting, grit blasting or other more aggressive processes that remove a significant amount of the base
metal or metallic coatings, which should not be used.
5.3 Removal of the valve
The valve shall be removed in accordance with ISO 25760.
The cylinders should not be left open or without valves longer than necessary for the inspection.
5.4 Removal of neck/core hole filters
Acetylene cylinders usually contain neck filters/core hole packings consisting of filter or metallic gauze and
felts. Neck filters and packing materials placed between the top of the porous material and the base of the
valve stem shall be removed, as appropriate, to enable an adequate inspection of the porous material in
accordance with the inspection requirements of the porous material manufacturer. For various types of
neck/core hole filters, see Annex B.
Some porous material manufacturers equip acetylene cylinders containing a monolithic porous material with
wooden plugs, which form an integral part of the porous material. These plugs, which are situated below the
neck filter or gauze arrangement, shall be left intact and not removed for the purpose of the visual examination
provided the wooden plug is in the correct position permitting the measurement of the gap in accordance with
the manufacturer's instructions. If during a previous inspection the wooden plug was tampered with, removed
by mistake or is not in the correct position, it shall be replaced with a new one in accordance with the porous
material manufacturer's specification.
Special care shall be taken when removing filters or packing material. Some restrictions at the neck can hold
residual pressure that, if suddenly released, can blow the filter out with some of the porous material and cause
injury.
NOTE The presence of soot on the filters or packing material indicates that a flashback might have occurred.
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6 Inspection and maintenance
6.1 External visual inspection
The external surface of each cylinder shall be inspected for
a) dents, cuts, gouges, bulges, cracks, laminations and excessive removal of material from the cylinder
base;
b) heat damage, torch or electric-arc burns;
c) corrosion. Special attention shall be given to areas where water can be trapped. These include the entire
base area, the junction between the body and the foot-ring and the junction between the body and the
shroud;
d) other defects such as illegible, incorrect or unauthorized stamp markings, or unauthorized additions or
modifications; and
e) integrity of all permanent attachments.
SAFETY PRECAUTIONS — Acetylene cylinders cannot be completely emptied. They will always
contain some residual acetylene and solvent (except for solvent-free acetylene cylinders). Therefore,
special care should be taken when repairing acetylene cylinders using methods that can be a source
of ignition (e.g. through heat or sparks).
Damaged valve guards, threaded neck-rings and foot-rings may be repaired or replaced as appropriate. No
welding or any heat shall be directly applied to the pressure-containing part of the cylinder. If welding is
performed on a non-pressure-containing part of the cylinder, due care shall be taken with regard to the
presence of acetylene and solvent.
The external visual inspection shall be carried out in accordance with the respective Annex of ISO 6406 (for
seamless steel cylinders), ISO 10460 (for welded steel cylinders) or ISO 10461 (for seamless aluminium-alloy
cylinders). Cylinders no longer suitable for future service shall be rendered unserviceable (see Clause 9).
Before being reintroduced into service, acetylene cylinders that have been damaged by fire shall be subjected
to a hardness test and its porous material shall be inspected thoroughly in accordance with 6.2.
6.2 Examination of the porous material
6.2.1 General
After the removal of neck/core hole filters in accordance with 5.4, the porous mate
...
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