EN ISO 10462:2013

SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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.

Contents Page
Foreword .3
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.

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
ISO 10462:2013(E)
© 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.
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Published in Switzerland
ii © ISO 2013 – All rights reserved

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 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

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 .
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 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

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 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
...