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© ISO 2010 – All rights reserved

ISO/TC 58/SC 4 N

Date: 2010-07-28

ISO/WD 10462

ISO/TC 58/SC 4/WG

Secretariat: BSI

Gas cylinders — Acetylene cylinders — Periodic inspection and

maintenance Élément introductif — Élément central — Élément complémentaire

Warning

This document is not an ISO International Standard. It is distributed for review and comment. It is subject to

change without notice and may not be referred to as an International Standard.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights ofwhich they are aware and to provide supporting documentation.

Dear Member,

Please let me have any comments you may wish to make regarding this poposal on or

before :4 October 2010

Unless advised otherwise by the due date I shall submit, on behalf of the UK, a vote of

approval with no comments regarding adding this project to the ISO/TC 58/SC 4

programme of work. Please let me know if you wish to take part in the work as a UK

Expert as unless 5, P, ISO/TC 58/SC 4 Member Bodies nominate Experts, the project

will not be approved.

Best regards,Charlie Duncombe,

Secretary to PVE/3/7,

18 August 2010

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Copyright notice

This ISO document is a working draft or committee draft and is copyright-protected by ISO. While thereproduction of working drafts or committee drafts in any form for use by participants in the ISO standardsdevelopment process is permitted without prior permission from ISO, neither this document nor any extractfrom it may be reproduced, stored or transmitted in any form for any other purpose without prior writtenpermission from ISO.

Requests for permission to reproduce this document for the purpose of selling it should be addressed asshown below or to ISO's member body in the country of the requester:

[Indicate the full address, telephone number, fax number, telex number, and electronic mail address, as

appropriate, of the Copyright Manager of the ISO member body responsible for the secretariat of the TC orSC within the framework of which the working document has been prepared.]

Reproduction for sales purposes may be subject to royalty payments or a licensing agreement.

Violators may be prosecuted.

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Contents Page

Foreword .........................................................................................................................................................iv

Intr oduct ion ......................................................................................................................................................v

1 Scope...................................................................................................................................................1

2 Normative references .........................................................................................................................1

3 Terms and definit ions .........................................................................................................................1

4 General ................................................................................................................................................1 4.1 Requirements for inspect ion..............................................................................................................1 4.2 Intervals between periodic inspect ions ............................................................................................1

5 Preparation of the acetylene cyl inder................................................................................................2 5.1 Removal of gas ...................................................................................................................................2 5.2 Preparat ion for external visual inspect ion ........................................................................................2 5.3 Removal of the valve ..........................................................................................................................2 5.4 Removal of neck/core hole fil ters ......................................................................................................3

6 Inspection and maintenance..............................................................................................................3 6.1 External visual inspect ion ..................................................................................................................3 6.2 Examination of the porous material ..................................................................................................3 6.2.1 Contamination.....................................................................................................................................4 6.2.2 Monolithic porous materials – Cracking, crumbling or cavitation ..................................................4 6.2.3 Non-monoli thic porous materials – Compaction..............................................................................4 6.3 Repair of non-monolithic porous materials ......................................................................................4 6.4 Replacement of the porous material .................................................................................................5

6.5 Inspection of fus ibl e plugs .................................................................................................................5 6.6 Inspection of valves ............................................................................................................................5

6.7 Inspection of cyl inder neck ................................................................................................................5

6.8 Reassembly .........................................................................................................................................5

7 Cylinder marking and ident if icat ion ..................................................................................................6

8 Records ...............................................................................................................................................6

9 Rejection and rendering cyl inders unserviceable ............................................................................6

10 Disposal of unservi ceable cyl inders .................................................................................................7

Annex A (informative) Periodic inspect ion intervals .....................................................................................8

A.1 Regular inspection intervals ..............................................................................................................8 A.2 Recommendations ..............................................................................................................................8

Annex B (normative) Description and evaluation of defects and conditions for rejection ofacetylene gas cylinders at time of visual inspect ion .......................................................................9

Annex C (informative) Illustration of the top of acetylene cylinders containing monolithic porous

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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 ISOtechnical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be represented on that committee. International organizations, governmental andnon-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 Standardsadopted by the technical committees are circulated to the member bodies for voting. Publication as anInternational 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 patentrights. 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 second/third/... edition cancels and replaces the first/second/... edition (), [clause(s) / subclause(s) /table(s) / figure(s) / annex(es)] of which [has / have] been technically revised.

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Introduction

Acetylene cylinders differ from all other cylinders transporting compressed or liquefied gases in that theycontain a porous material and normally a solvent in which the acetylene stored is dissolved. However, forspecial applications there exist some acetylene cylinders containing a porous material and no solvent. For theperiodic inspection cycle, due regard is to be given to the different types of construction of cylinders andporous materials. The remainder of this document should be read considering these differences.

The primary objective of the presence of the porous material is to limit an acetylene decomposition, should itbe initiated, and thus prevent a cylinder incident. If some porous material is missing, or if a defect (e.g. acavity, 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 which can cause a violent failure of the cylinder accompaniedby an explosion.

The requirements dealt with in this document are mainly those that are specific for acetylene cylinders; formore general requirements related to the periodic inspection of gas cylinders, reference is made to therelevant 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.

Due to the presence of a porous material in the cylinder, neither a hydraulic or pneumatic pressure test, nor avisual inspection of the internal surface of the shell shall be carried out.

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WORKING DRAFT ISO/WD 10462

Gas cyl inders — Acetylene cylinders — Periodic inspection andmaintenance

1 ScopeThis International Standard specifies the requirements for the periodic inspection of acetylene cylinders withand without solvent.

2 Normative references

The following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

ISO 3807-1, Cylinders for acetylene – Basic requirements, Part 1: Cylinders without fusible plugs

ISO 3807-2, Cylinders for acetylene – Basic requirements, Part 2: Cylinders with fusible plugs

ISO 13769, Gas cylinders — Stamp marking

ISO 25760, Gas cylinders — Operational procedures for the safe removal of valves from gas cylinders

ISO 22434, Transportable gas cylinders - Inspection and maintenance of cylinder valves

3 Terms and definitions

To be updated in line with definitions in other standards for acetylene cylinders

4 General

4.1 Requirements for inspection

The periodic inspection of acetylene cylinders shall be carried out only by competent and trained persons whoshall ensure that the cylinders are fit for continued safe use.

Due to the presence of a porous material in the cylinder neither a pressure test (hydraulic or pneumatic) nor a

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a) Non-monolithic porous materials:

2 years

b) Monolithic porous materials:

3 years

After the first periodic inspection according to either a) or b), the normal period as stated in Annex A shallapply.

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 agas cylinder before the content has been used, even though the inspection interval may have lapsed.

5 Preparation of the acetylene cylinder

5.1 Removal of gas

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 mannerhaving due regard to the characteristics of acetylene. Depressurization shall be carried out over a period longenough to ensure removal of all acetylene, except saturation gas. Precautions shall be taken becausevariations in temperature influence the quantity of acetylene in the form of saturation gas.

The absence of a positive pressure reading does not clearly indicate the absence of excess gas due to thepossibility of a blocked valve (see ISO 25760). In case of any doubts regarding the efficiency of thedepressurization cycle, the cylinder shall be weighed.

If a cylinder weighs more than the tare weight (see 3.x) stamped on the cylinder, this is not always a clear

indication for the presence of excess gas. Some relevant factors that have to be considered are a possibleexcess of solvent or contamination with water, etc.

If a cylinder weighs less than or equal to the stamped tare weight, this is not always a clear indication for theabsence of gas under pressure. Some relevant factors that have to be considered are a possible solventshortage or external corrosion causing a loss of shell weight.

5.2 Preparation for external visual inspection

Each cylinder shall be cleaned and have all loose coatings, corrosion products, tar, oil or other foreign matterremoved from its external surface by a suitable method, e. g. by brushing, shot blasting (under closelycontrolled 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 toavoid damaging the cylinder and pressure relief devices where fitted or removing excess amounts of cylinderwall.

The external visual inspection in accordance with 6 1 can be carried out at this stage

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5.4 Removal of neck/core hole filters

Acetylene cylinders usually contain neck filters/core hole packings consisting of filter or metallic gauze andfelts. Neck filters and packing materials placed between the top of the porous material and the base of thevalve stem shall be removed, as appropriate, to enable an adequate inspection of the porous material inaccordance with the inspection requirements of the porous material manufacturer. For various types ofneck/core hole filters see Annex C.

Some porous material manufacturers equip acetylene cylinders containing a monolithic porous material withwooden plugs, which form an integral part of the porous material. These plugs, which are situated below theneck filter or gauze arrangement, shall be left intact and not removed for the purpose of the visual examinationprovided 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 has been tampered with orremoved by mistake or is not in the correct position this plug shall be replaced with a new one in accordancewith the porous material manufacturer's specification.

Special care shall always be taken when removing filters or packing material in view of the possibility of somerestrictions at the neck with residual pressure underneath, which, if suddenly released, can blow the filter outwith some of the porous material and can cause injury.

NOTE The presence of soot on the filters or packing material indicates that a flashback might have occurred.

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 (see Table B.1) and excessive removal of material fromthe cylinder base;

b) heat damage, torch or electric-arc burns (see Table B.1);

c) corrosion (see Table B.2);

d) other defects such as illegible, incorrect or unauthorized stamp markings, or unauthorized additions ormodifications (see Table B.1);

e) integrity of all permanent attachments (see Table B.2).

Damaged valve guards, threaded neck rings and foot rings may be repaired or replaced as appropriate. Nowelding or any heat shall be directly applied to the pressure containing part of the cylinder. If welding isperformed on a non-pressure-containing part of the cylinder, due care shall be taken with regard to thepresence of acetylene and solvent.

For rejection criteria, see Annex B. Cylinders no longer suitable for future service shall be renderedunserviceable (see Clause 9).

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6.2.1 Contamination

The porous material shall be checked visually for contamination such as the presence of soot, water or oildeposits or if there has been a discoloration of the porous material. Depending on the level of suchcontamination, the competent person shall decide if the porous material is to be rejected.

In addition an unusual smell is a sign for contamination.

6.2.2 Monolithic porous materials – Cracking, crumbling or cavitation

The visual inspection shall verify that the porous material shows:

a) no excessive top clearance (gap between the top of the cylinder and the monolithic porous material);

- The maximum top clearance between the cylinder shell and the monolithic porous material shall notexceed that in the type approval, if specified. Those gaps up to the maximum given in the type approvalshall apply. If at a later stage, cylinders with other top clearance sizes pass the requirements of thebackfire test as described ISO 3807, and are approved, then these top clearance sizes apply. If a topclearance specification or guidance is not available for a given cylinder, the top clearance size shall notexceed 2 mm for an asbestos free porous material and 5 mm for all other monolithic porous materials.

b) no excessive cracking;

Only small cracks without visible flanks are acceptable for all porous materials, provided that they do notincorporate break outs and do not allow the material to dislodge This can be checked by applying a gentlelateral load with a gloved finger. Porous materials with cracks with visible flanks are not acceptable andshall be rejected (for examples see Annex D).

c) no excessive crumbling;

Crumbling of the porous material is acceptable if it is arising from the collar of the porous material only and

if it is so little that the maximum allowed top clearance is not exceeded at any point. Small break outs in thetop of the cylinder neck/shoulder area are acceptable and may be repaired by a method validated andendorsed by the porous material manufacturer, e.g. by backfire testing. Cylinders with porous materials that show crumbling in excess of the allowable shall be rejected.

d) no void or cavities.

The porous material shall be checked to ensure that there are no voids or cavities between the porousmaterial and the cylinder wall by verifying there is no lateral movement. A cylinder that demonstrates lateralmovement of porous material shall be rejected.

If the cylinder is equipped with a wooden plug (see 5.4) it shall be checked, by applying a gentle load, that theplug is firmly fixed in its position and there is no lateral movement of the wooden plug. In no case, the woodenplug shall be removed during the inspection.

6.2.3 Non-monoli thic porous materials – Compaction

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The quantity of porous material added shall be recorded, the tare weight of the cylinder adjusted asappropriate, and the stamp marking adjusted accordingly.

A cylinder which contains a rejected porous material which is not suitable for repair in accordance with thisclause shall be rendered unserviceable (see clause 9) or its porous material shall be replaced according to6.4.

6.4 Replacement of the porous material

If the porous material is no longer acceptable but the external condition of the cylinder shell is satisfactory,then either the existing porous material shall be replaced, or the complete cylinder shall be madeunserviceable.

The removal of the existing porous material and the solvent shall be carried out in a safe manner and thecylinder shall be thoroughly cleaned and inspected. Special care shall be taken if the porous material containsasbestos.

The internal surface of the cylinder shell shall be examined for corrosion or other visible defects and thecylinder shall be hydraulically tested at the stamped test pressure by a competent person. If the cylinder shellis found to be satisfactory, it is permissible to newly introduce porous material.

If a different porous material is employed the original porous material manufacturer's identification mark shallbe removed and the identity of the new porous material, its manufacturer and all other characteristicsnecessary to ensure safe operation shall be stamped onto the cylinder. In addition the new tare weight shallbe stamped onto the cylinder having obliterated the old tare weight marking. See ISO 13769.

6.5 Inspection of fusib le plugs

Where fusible plugs are used they shall be examined for damage. Where damage is found the fusible plug shall be replaced and checked for gas tightness. If it is decided to replace fusible plugs with solid plugs, thisshall be performed in accordance with a written procedure, approved by the inspection body.

6.6 Inspection of valves

It is recommended that valves are replaced at the time of the periodic inspection.

However, if a valve or any other accessory is to be reintroduced into service, it shall be inspected andmaintained to ensure that it will perform satisfactorily in service and meet the requirements of gas tightness.

In this case the inspection of the valve shall be done in accordance with ISO 22434.

6.7 Inspection of cylinder neck

To be decided

6.8 Reassembly

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Where relevant regulations require, a ring shall be fitted over the stem of the valve prior to the valve beingfitted to indicate the date (year) of the next periodic inspection. Annex E provides one example of an existing

system for indicating periodic inspection dates. Other systems are in use.

7 Cylinder marking and identification

Each cylinder that passes the periodic inspection shall be marked with the date of the inspection and thesymbol of the inspection body in accordance with the relevant standard or regulation, e.g. ISO 13769. Wherean alteration of any stamp marking is necessary (e.g. due to a change of the tare weight as a consequence ofreplacement of a footring, neck ring, guard, valve, or the porous material or as a consequence of addition ofnew porous material), the old markings shall be obliterated (or crossed out) and the new data shall be

stamped. A method shall be used that cannot damage the porous material.

For monolithic porous materials, stamping on the shoulder of welded cylinders is not permitted unless a dataplate is provided for that purpose or unless it is provided for by the specification to which the cylinder ismanufactured. In such cases, the stamping may be on a ring under the valve (see ISO 13769).

For labeling of the cylinder see ISO 7225.

Where relevant regulations require, the next periodic inspection date shall be shown by an appropriatemethod such as a ring fitted between the valve and the cylinder indicating the date (year) of the next periodic

inspection. Annex G provides one example of an existing system for indicating periodic inspection dates.Other systems are in use and the same systems are used with different colours for the same year.

8 Records

A cylinder periodic inspection record shall be retained for at least 15 years. It shall record sufficient informationto positively identify the cylinder and the results of the periodic inspection. The following information shall beavailable:

a) owner's name;

b) manufacturer's or owner's serial number;

c) type and weight of porous material added, if any;

d) attachment replacement, if any;

e) cylinder tare change if appropriate;

f) result of inspection (pass or fail – in case of failure, the reasons should be recorded);

g) present inspection date – year/month/day;

h) identification symbol of inspection body or test station;

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the shoulder, to be re-issued into service. In case of any disagreement, it shall be ensured that the legalimplication of the contemplated action is fully understood.

Prior to taking any of the following actions, ensure that the cylinder is empty (see Clause 5). Appropriatemeasures shall be taken in case the porous material is an asbestos-containing material.

The following methods may be employed:

a) crushing the cylinder using mechanical means;

b) irregular cutting of the neck; or

c) irregular cutting of the cylinder in two or more pieces including the shoulder

d) destroying of the cylinder neck thread.

10 Disposal of unserviceable cylinders

Methods used for disposing of non-acetylene cylinders are inappropriate for acetylene cylinders because ofthe nature of the contents of an acetylene cylinder.

When disposing of acetylene cylinders, very careful consideration shall be given to the fact that the cylinderscould contain residual acetylene, solvent (DMF, acetone) and porous material, which could contain asbestos.

Disposal shall be in accordance with local, provincial and national regulations.

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Annex A (informative)

Periodic inspection intervals

A.1 Regular inspection intervals

The following information is outlined in the United Nations Recommendations for the Transport of DangerousGoods, Model Regulations, thirteenth edition. The most recent edition should be consulted.

Packing instruction P200 of the United Nations Recommendations for the Transport of Dangerous Goods,Model Regulations, 15th revised edition, specifies the following:

For UN 1001 acetylene, dissolved, the test period is 10 years.

For UN 3374 acetylene, solvent free, the test period is 5 years.

A.2 Recommendations

It is recommended that an acetylene cylinder be charged with acetylene only if it has been subjected to a first periodic inspection after the following interval:

⎯ For cylinders containing a non-monolithic porous material: For all cylinders newly filled with porous

material, the first periodic inspection should be performed after 2 years ± 6 months in service. Thereafter,subsequent inspections should be performed every 5 years.

⎯ For cylinders containing a monolithic porous material: For all cylinders newly filled with porous material,

the first periodic inspection should be performed after 3 years ± 6 months in service. Thereafter,subsequent inspections should be performed every 10 years.

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Annex B (normative)

Descript ion and evaluation of defects and conditions for rejection ofacetylene gas cylinders at time of visual inspection

The content should be prepared by the respective experts and probably depends on the other standards forperiodic inspection

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Annex C (informative)

Illustration of the top of acetylene cylinders containing monolithicporous material and tools and clearance gauges

a) Monolithic porous mass wit hout core hole, valve hole filled with felt,

metal screen on top of felt filt er

b) Core hole filled with felt, wood or f ibrous padding material,

metal screen on t op of f elt filter in valve hole

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Figure C.1 — Diagram of the tops o f seamless (left) and welded (righ t) acetylene cylinders containingmonolithic po rous mass: types withou t pressure relief devices

a) Ellipsoidal/toroidal head with marking on shoulder b) Ellipsoidal/toroidal head with flange marking

c) Ellipsoidal/toroidal head with collar: marking on collar

Key

1 fusible plug (location and quantity can vary)

2 gap

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Figure C.3 shows examples of top clearance gauges.

Figure C.3 — Examples of top clearance gauges for monolithic porous mass

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Annex D(normative)

Cracks in the porous material

D.1 Figure D.1 a) shows an acetylene cylinder with porous material that shows cracking and crumbling butthat could be acceptable for further service. The cylinder may be further used provided there are no break-outs and the porous material cannot be dislodged.

D.2 Figure D.1 b) shows an acetylene cylinder with a porous material that shows cracking and crumbling andthat shall be rejected.

a) Hairline crack without visible sidewalls b) Crack with visible sidewalls

Figure D.1 — Cracks in the monolithic porous mass of an acetylene cylinder

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Annex E (informative)

Test date rings for gas cylinders

NOTE Systems other than the one specified in Table E.1 are in use, and the same system is used with differentcolours.

Table E.1 — System using colour and shape of rings to identify retest datesYear Colou r Shape

2000 Aluminium Circle

2001 Red Hexagon

2002 Blue Hexagon

2003 Yellow Hexagon

2004 Green Hexagon

2005 Black Hexagon2006 Aluminium Hexagon

2007 Red Square

2008 Blue Square

2009 Yellow Square

2010 Green Square

2011 Black Square

2012 Aluminium Square

2013 Red Circle

2014 Blue Circle

2015 Yellow Circle

2016 Green Circle

2017 Black Circle

2018

a

Aluminium Circle

2019 Red Hexagon

2020 Blue Hexagon

2021 Yellow Hexagon

2022 Green Hexagon

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Annex F

Acetylene cylinders manufactured according to National Regulat ions

(This annex has been taken from the EN standard; the references, see the yellow highlights, need to bebrought on ISO level and actualized)

F.1 Scope

This annex specifies those checks, inspections and tests which should be performed in order to qualifyexisting acetylene cylinders, manufactured according to National Regulations, to ensure their conformance tothe TPED for free movement and use between all Member States of the European Union.

The annex does not apply to acetylene cylinders manufactured according to EU Directives 84/525/EEC,84/526/EEC or 84/527/EEC, or to European Standards for gas cylinder construction.

F.2 Definit ions and symbols

π : Official stampmark required by the TPED to certify existing gas cylinders conforming to RID/ADR for use

throughout the European Union.

F.3 General recommendations

F.3.1 The owner of the gas cylinders should indicate to the inspection body the types and the number of gas

cylinders presented for qualification.

For each of the cylinders the following information should be made available for documentation andsubsequent calculation:

- manufacturer;

- serial number;

- date of manufacture (cylinder shell and porous mass;

- regulation or specification to which the cylinder was manufactured;

- working pressure;

- test pressure;

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- water capacity;

- type of porous mass;

- type of solvent;

- maximum acetylene charge;

- tare (A or S or F).

The inspection body should verify that this list contains all the necessary information to clearly define thecylinder shell and porous mass (see example of production testing certificate for the shell in the relevant

annex of e.g. EN 1964-1, prEN 13322-1 and EN 1975 and for the porous mass in EN 1800, for the abovelisted parameters only).

F.3.2 The inspection body should verify that these cylinders are not on any relevant national safety related

recall list. Additionally if any restrictions of use apply they should be maintained for further use.

F.3.3 The inspection body should verify that the wall thickness of the gas cylinders is equal to, or greater

than, the minimum wall thickness, as calculated in accordance with EN 1964-1, prEN 13322-1 or EN 1975, for

the corresponding yield stress of the cylinder.

F.3.4 The inspection body should verify that the manufacturing certificates or equivalent records of the

cylinder shells are available. When manufacturing certificates are not available, the inspection body should

verify that all relevant type testing and manufacturing batch testing have been performed. It should also verify

that the porous mass has been approved to a procedure equivalent to EN 1800, or to ISO 3807-1 or

ISO 3807-2.

F.3.5 The periodic inspection according to this standard should all be performed during the course of the

requalification.

F.4 Special markings

A gas cylinder passing the periodic inspection may only be stamped with the mark π provided that the

requirements under F.3 have been fully verified.

F.5 Inspetion report

The inspection body shall prepare a report for each type of cylinder.

All relevant certifications, new tests and inspections performed should be attached to this report.

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Bibliography

[1] ISO 32, Gas cylinders for medical use — Marking for identification of content

[2] ISO 6406, Gas cylinders — Seamless steel gas cylinders — Periodic inspection and testing

[3] ISO 7225, Gas cylinders — Precautionary labels

[4] ISO 10297, Gas cylinders — Refillable gas cylinder valves — Specification and type testing

[5] ISO 10460, Gas cylinders — Welded carbon-steel gas cylinders — Periodic inspection and testing

[6] ISO 10461, Gas cylinders — Seamless aluminium-alloy gas cylinders — Periodic inspection andtesting

[7] ISO 10920, Gas cylinders — 25E taper thread for connection of valves to gas cylinders —Specification

[8] ISO 11114-2, Transportable gas cylinders — Compatibility of cylinder and valve materials with gascontents — Part 2: Non-metallic materials

[9] ISO 11191, Gas cylinders — 25E taper thread for connection of valves to gas cylinders — Inspectiongauges

[10] ISO 12426, Transportable gas cylinders — Gas cylinder valves — Manufacturing tests and inspections

[11] Recommendations on the Transport of Dangerous Goods, Model Regulations , thirteenth edition,United Nations

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Comparison of standards for the periodic inspection of acetylene cylinders

BAM, Cordula Wilrich Page 6 of 27 pages 2010-05-12

EN 12863:2002/A1:2005 (E) ISO 10462:2005(E) Proposal for combined standard Comment or justi ficationNOTE The following abbreviations areused:

⎯ “A” for acetone;

⎯ “DMF” for dimethylformamide.

3.14tare weightreference mass of the acetylene cylinderwith the specified amount of solventNOTE 1 Tare weight is expressed inkilograms.NOTE 2 This is further specified inaccordance with 3.14.1, 3.14.2 or 3.14.3.NOTE 3 For cylinders with solvent, the tare

weight is expressed by indicating either one orboth of the masses corresponding to tare A andtare S. For solvent-free acetylene cylinders, thetare weight is expressed by indicating a tare F.For the tare weight used for cylinders inbundles, see ISO 3807-1 or ISO 3807-2, 7.5.3.

3.14.1tare Asum of empty mass of the cylinder shell,the mass of the porous substance (see

3.12), the specified mass of solvent, themass of any coating (e.g. paint) used inservice, the mass of the valve includingthermocouple where fitted, any fixed valveguard and the mass of all other parts thatare permanently attached (e.g. by clampingor bolt fixing) to the cylinder when it ispresented for filling3.14.2tare S

tare A plus the acetylene mass required tosaturate the solvent at normal atmosphericpressure (1,013 bar) and at a temperatureof 15 °C (saturation gas)NOTE Tare S is expressed in kilograms.

3.14.3tare Ftare A minus the specified mass of solvent3.15total weight

total mass equal to tare A (or tare F for

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EN 12863:2002/A1:2005 (E) ISO 10462:2005(E) Proposal for combined standard Comment or justi fication

solvent-free cylinders) plus the maximumacetylene contentNOTE Total weight is expressed inkilograms.

3.16water capacity (cylinder shell volume)actual capacity of the cylinder shell,measured by filling the shell with waterNOTE 1 Water capacity is expressed inlitres.NOTE 2 The cylinder shell is defined asbeing empty of any porous mass, see 3.7.

4 General

4.1 Requirements for inspection

4 General

4.1 Requirements for inspectionThe periodic inspection of acetylenecylinders shall be carried out only bycompetent and trained persons who shallensure that the cylinders are fit forcontinued safe use.

NOTE A competent person is a personwho has the necessary technicalknowledge, experience and authority toassess and approve materials for use withgases and to define any special conditionsof use that are necessary. Such a personwill also normally be formally qualified in anappropriate technical discipline.

Due to the presence of a porous mass inthe cylinder neither a pressure test(hydraulic or pneumatic) nor a visual

inspection of the internal surface of theshell, is required by this standard.Where cylinders are manufacturedaccording to National Regulations and areintended to be qualified under theTransportable Pressure EquipmentDirective (TPED) for free movement anduse between member states of theEuropean Union, additional requirementsare specified in annex A.

no equivalent in ISO 10462 The periodic inspection of acetylenecylinders shall be carried out only bycompetent and trained persons who shallensure that the cylinders are fit forcontinued safe use.

Due to the presence of a porous material inthe cylinder neither a pressure test(hydraulic or pneumatic) nor a visualinspection of the internal surface of theshell is required by this standard.

The information regardingthe competent person EN12863 as given in the Note tothe left should be given in thedefinitions (as it is done inISO 10462 anyway).

4.2 Intervals between periodi c 4 Intervals between period ic 4.2 Intervals between period ic

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valve threads shall be examined to identifythe type of thread (e.g. 25E as specified inISO 10920) and to ensure that they are

⎯ clean and of full form,

⎯ free of damage,

⎯ free of burrs,

⎯ free of cracks, and

⎯ free of other imperfections.Cracks manifest themselves as lines thatrun vertically down the thread and acrossthe thread faces. They should not beconfused with tap marks (thread machining

stop marks). Special attention should bepaid to the area at the bottom of the threads.

6.7.2 Other neck sur facesOther surfaces of the neck shall also beexamined to ensure they are free of cracksor other defects (see Annex C).

6.7.3 Damaged internal neckthreads

Where necessary and where themanufacturer or the competent designauthority confirms that the design of theneck permits, threads may be re-tapped orthe thread type changed to provide theappropriate number of effective threads. After re-tapping or changing the thread form,the threads shall be checked with theappropriate thread gauge (e.g. ISO 11191for 25E threads).

6.7.4 Neck ring and col larattachmentWhen a neck ring/collar is attached, anexamination shall be carried out to ensurethat it is secure and to inspect for threaddamage. A neck ring shall only be changedusing an approved procedure. If it is foundthat any significant damage to cylindermaterial has occurred by replacement of

the neck ring/collar, the cylinder shall be

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The following information is outlined in theUnited Nations Recommendations for the

Transport of Dangerous Goods, ModelRegulations, thirteenth edition. The mostcurrent edition should be consulted.

Packing instruction P200 of the UnitedNations Recommendations for theTransport of Dangerous Goods, ModelRegulations, 13th revised edition, specifiesthe following:

Special packing provision p: For UN 1001acetylene, dissolved and UN 3374acetylene, solvent free, cylinders shall befilled with a homogeneous monolithicporous mass.

For UN 1001 acetylene, dissolved, the testperiod is 10 years.

For UN 3374 acetylene, solvent free, thetest period is 5 years.

A.2 Recommendations

It is recommended that an acetylenecylinder be charged with gas only if it hasbeen subjected to a periodic inspectionaccording to the requirements of thisstandard with the following specifiedperiod:

⎯ For cylinders containing a non-monolithic porous mass: For all newlymassed cylinders, the first periodicinspection should be performed within

2 years ± 6 months in service.Thereafter, subsequent inspectionsshould be performed every 5 years.

⎯ For cylinders containing a monolithic

porous mass: For all newly massed

It is recommended that an acetylenecylinder be charged with acetylene only if it

has been subjected to a first periodicinspection after the following interval:

- For cylinders containing a non-monolithic porous material: For allcylinders newly filled with porousmaterial, the first periodic inspection

should be performed after 2 years ± 6months in service. Thereafter,subsequent inspections should beperformed every 5 years.

− For cylinders containing a monolithicporous material: For all cylinders newlyfilled with porous material, the firstperiodic inspection should be performed

after 3 years ± 6 months in service.Thereafter, subsequent inspectionsshould be performed every 10 years.


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cylinders, the first periodic inspectionshould be performed after 3 years

± 6 months in service. Thereafter,

subsequent inspections should beperformed every 10 years.

It is recommended that an acetylenecylinder be charged with gas only if it hasbeen subjected to a periodic inspectionaccording to the requirements of thisstandard with the following specifiedperiod:

- For cylinders containing a non-monolithicporous mass: For all newly massedcylinders, the first periodic inspection

should be performed within 2 years ± 6months in service. Thereafter,subsequent inspections should beperformed every 5 years.

- For cylinders containing a monolithicporous mass: For all newly massedcylinders, the first periodic inspection

should be performed after 3 years ± 6months in service. Thereafter,subsequent inspections should beperformed every 10 years.

Annex B Procedure to be adoptedwhen a cylinder valve issuspected to be obstructed

Annex B Procedure to be adoptedwhen de-valving and when it issuspected that a cylinder valveis obstructed

This Annex is no longernecessary becausereference is made to ISO25760, Gas cylinders —

Operational procedures forthe safe removal of valvesfrom gas cylinders

Annex C Descript ion, evaluation ofdefects and conditions forrejection of acetylene gascylinders at time of visualinspection

Annex C Descript ion and evaluationof defects and conditions forrejection of acetylene gascylinders at time of visualinspection

Annex B (normative)Descript ion and evaluation ofdefects and conditions forrejection of acetylene gascylinders at time of visualinspection

The content of a combinedformer Annex C should beprepared by the respectiveexperts and probablydepends on the otherstandards for periodicinspection

Annex D Tools and clearance Annex D Tops of acetylene Annex C (informative) The complete Annex D of

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seamless, steel gas cylinders84/526/EEC Council Directive of 17September 1984 on the approximation of

the laws of the Member States relating toseamless, unalloyed aluminium andaluminium alloy gas cylinders84/527/EEC Council Directive of 17September 1984 on the approximation ofthe laws of the Member States relating towelded unalloyed steel gas cylinders ADR European agreement on theInternational Carriage of Dangerous Goodsby Road

RID Regulations concerning theInternational Carriage of Dangerous Goodsby Rail

iso_tc_58___sc_4_n_n611

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