SIST EN ISO 25760:2015
(Main)Gas cylinders - Operational procedures for the safe removal of valves from gas cylinders (ISO 25760:2009)
Gas cylinders - Operational procedures for the safe removal of valves from gas cylinders (ISO 25760:2009)
This International Standard is intended for suppliers, operators in testing facilities, operators performing
cylinder maintenance and any person authorized to remove valves from gas cylinders. It details procedures
for the safe removal of valves from cylinders and includes techniques for the identification of inoperable valves.
Only the risks due to gas and gas mixtures under pressure are addressed; other technical issues relating to
the removal of a valve from a cylinder are not covered.
Some specialized equipment and procedures are in use in parts of the gas industry to safely remove cylinder
valves from low pressure gas cylinders while under pressure, e.g. liquefied petroleum gas (LPG); these
techniques are not included in this International Standard.
Gasflaschen - Verfahren für das sichere Entfernen von Ventilen aus Gasflaschen (ISO 25760:2009)
Bouteilles à gaz - Modes opératoires de dépose en toute sécurité des robinets de bouteilles à gaz (ISO 25760:2009)
L'ISO 25760:2009 est destinée aux fournisseurs, aux personnes effectuant des contre-essais et aux opérateurs assurant la maintenance des bouteilles, ainsi qu'à toute personne autorisée à procéder à la dépose des robinets des bouteilles à gaz. Elle détaille les méthodes permettant de retirer les robinets des bouteilles en toute sécurité et présente des techniques permettant d'identifier les robinets non manœuvrables.
Ne sont traités que les risques dus au gaz et aux mélanges gazeux sous pression; les autres questions techniques liées à la dépose d'un robinet d'une bouteille ne sont pas abordées.
Des équipements spéciaux et des modes opératoires particuliers sont utilisés dans certains secteurs de l'industrie du gaz pour permettre de déposer en toute sécurité les robinets des bouteilles à gaz à basse pression, par exemple à gaz de pétrole liquéfié (GPL), encore sous pression; l'ISO 25760:2009 ne porte pas sur ces techniques.
Plinske jeklenke - Delovni postopki za varno odstranjevanje ventilov s plinskih jeklenk (ISO 25760:2009)
Ta mednarodni standard je namenjen za dobavitelje, operaterje v preskusnih centrih, vzdrževalce jeklenk in vse osebe, pooblaščene za odstranjevanje ventilov s plinskih jeklenk. Navaja postopke za varno odstranitev ventilov z jeklenk in vključuje tehnike za identifikacijo neuporabnih ventilov. Obravnava samo tveganja zaradi plina in plinskih mešanic pod tlakom; ne zajema drugih tehničnih vprašanj v zvezi z odstranitvijo ventila z jeklenke.
V nekaterih sektorjih industrije plina uporabljajo posebno opremo in postopke, s katerimi varno odstranijo ventile z jeklenk z nizkotlačnimi plini, ki so pod pritiskom, na primer utekočinjeni naftni plin (UNP); te tehnike niso vključene v ta mednarodni standard.
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Plinske jeklenke - Delovni postopki za varno odstranjevanje ventilov s plinskih jeklenk (ISO 25760:2009)Gasflaschen - Verfahren für das sichere Entfernen von Ventilen aus Gasflaschen (ISO 25760:2009)Bouteilles à gaz - Modes opératoires de dépose en toute sécurité des robinets de bouteilles à gaz (ISO 25760:2009)Gas cylinders - Operational procedures for the safe removal of valves from gas cylinders (ISO 25760:2009)23.020.30MHNOHQNHPressure vessels, gas cylindersICS:Ta slovenski standard je istoveten z:EN ISO 25760:2015SIST EN ISO 25760:2015en,de01-maj-2015SIST EN ISO 25760:2015SLOVENSKI
STANDARD
SIST EN ISO 25760:2015
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN ISO 25760
February 2015 ICS 23.020.30 English Version
Gas cylinders - Operational procedures for the safe removal of valves from gas cylinders (ISO 25760:2009)
Bouteilles à gaz - Modes opératoires de dépose en toute sécurité des robinets de bouteilles à gaz (ISO 25760:2009) Gasflaschen - Verfahren für das sichere Entfernen von Ventilen aus Gasflaschen (ISO 25760:2009) This European Standard was approved by CEN on 19 January 2015.
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 © 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 25760:2015 ESIST EN ISO 25760:2015
EN ISO 25760:2015 (E) 2 Contents Page Foreword .3 SIST EN ISO 25760:2015
EN ISO 25760:2015 (E) 3 Foreword The text of ISO 25760:2009 has been prepared by Technical Committee ISO/TC 58 “Gas cylinders” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 25760:2015 by 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 August 2015, and conflicting national standards shall be withdrawn at the latest by August 2015. 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. 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 25760:2009 has been approved by CEN as EN ISO 25760:2015 without any modification. SIST EN ISO 25760:2015
SIST EN ISO 25760:2015
Reference numberISO 25760:2009(E)© ISO 2009
INTERNATIONAL STANDARD ISO25760First edition2009-06-15Gas cylinders — Operational procedures for the safe removal of valves from gas cylinders Bouteilles à gaz — Modes opératoires de dépose en toute sécurité des robinets de bouteilles à gaz
SIST EN ISO 25760:2015
ISO 25760:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
COPYRIGHT PROTECTED DOCUMENT
© ISO 2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 • CH-1211 Geneva 20 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 2009 – All rights reserved
SIST EN ISO 25760:2015
ISO 25760:2009(E) © ISO 2009 – All rights reserved iiiContents Page Foreword.iv Introduction.v 1 Scope.1 2 Normative references.1 3 Terms and definitions.1 4 General requirements.3 4.1 Application.3 4.2 Hazards.3 4.3 Operator safety and protection.3 4.4 Operator qualifications.3 4.5 Operator errors.4 4.6 Special valve designs.5 5 Methods for inoperable valves.5 5.1 Summary of methods.5 5.2 Choice of method.6 6 Procedures.6 6.1 Procedures to identify and segregate cylinders with inoperable valves.6 6.2 Standard devalving procedure for treating cylinders with operable valves.7 6.3 Procedures for treating cylinders with inoperable valves.8 7 Damaged valves and cylinders.8 Annex A (informative)
Reasons cylinder valves become inoperable.9 Annex B (informative)
Examples of methods for depressurization of gas cylinders with inoperable valves.11 Bibliography.18
SIST EN ISO 25760:2015
ISO 25760:2009(E) iv © ISO 2009 – All rights reserved 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 25760 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 4, Operational requirements for gas cylinders and is based on EIGA Document 129/05 Pressure receptacles with blocked or inoperable valves. EIGA has granted permission to reproduce excerpts from their document. SIST EN ISO 25760:2015
ISO 25760:2009(E) © ISO 2009 – All rights reserved vIntroduction Cylinders are devalved for many purposes, such as periodic inspection and testing, cylinder cleaning, change of service, replacement of a damaged valve, installation of a new valve, preparation for filling or scrapping. Occasionally, gas cylinder valves can become blocked by corrosion or foreign material or become inoperable due to external or internal damage. It is an essential safety requirement that such valved cylinders be identified and treated with special care as soon as practicable. The operation of removing a valve should only be carried out if the cylinder is made safe with respect to residual gas and pressure. It is recommended that gas suppliers be prepared with both the proper equipment and trained operators for dealing with such valved cylinders. Practical techniques that have been tried and tested over many years within the gas industry are described. Valve removal activities can pose hazards to the life and physical safety of the operator, especially if the cylinder is under pressure. Valves should only be removed after ensuring there is no residual pressure in the cylinder.
SIST EN ISO 25760:2015
SIST EN ISO 25760:2015
INTERNATIONAL STANDARD ISO 25760:2009(E) © ISO 2009 – All rights reserved 1Gas cylinders — Operational procedures for the safe removal of valves from gas cylinders 1 Scope This International Standard is intended for suppliers, operators in testing facilities, operators performing cylinder maintenance and any person authorized to remove valves from gas cylinders. It details procedures for the safe removal of valves from cylinders and includes techniques for the identification of inoperable valves. Only the risks due to gas and gas mixtures under pressure are addressed; other technical issues relating to the removal of a valve from a cylinder are not covered. Some specialized equipment and procedures are in use in parts of the gas industry to safely remove cylinder valves from low pressure gas cylinders while under pressure, e.g. liquefied petroleum gas (LPG); these techniques are not included in this International Standard. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 11114-1, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1: Metallic materials ISO 11114-2, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 2: Non-metallic materials 3 Terms and definitions For the purposes of this document, the following terms and definitions apply: 3.1 gas cylinder pressure receptacle including individual cylinder, tube, pressure drum or manifold combination of these 3.2 valve device that allows gas to enter or exit a gas cylinder and retains the pressure in the cylinder when in the closed position NOTE This also includes the fittings of cylinders in bundles and battery vehicles. 3.3 inoperable valve valve that is blocked, broken or malfunctioning or that in any way prevents gas from entering or exiting the gas cylinder NOTE See Annex A. SIST EN ISO 25760:2015
ISO 25760:2009(E) 2 © ISO 2009 – All rights reserved 3.4 operable valve device that allows gas to enter or exit a gas cylinder 3.5
residual pressure valve RPV type of valve that prevents the gas cylinder from being totally depressurized by holding back a specific amount of residual pressure NOTE 1 Requirements for this type of valve are specified in ISO 15996. NOTE 2 This valve type is very often associated with a non-return function. 3.6
valve with integrated pressure regulator VIPR device intended to be permanently fitted to a gas cylinder connection and comprising a shut-off valve system and pressure reduction system NOTE 1 Adapted from ISO 22435:2007, definition 3.3. NOTE 2 Requirements for this type of valve are specified in ISO 15996. 3.7 pressure relief device
PRD device that is fitted to the cylinder or cylinder valve and designed to relieve gas pressure in the event of abnormal conditions resulting in the development of excessive pressure inside the cylinder or when the cylinder is subjected to high temperatures NOTE 1 This might be a pressure relief valve, a non-reclosing PRD or a non-reclosing PRD in combination with a pressure relief valve. NOTE 2 The expression “pressure relief” is synonymous with “safety relief”, as used in various applicable regulations, codes, standards or specifications. 3.8 quick connect valve clip-on valve valve that does not contain an operating device, such as a handwheel 3.9 low pressure gas cylinder gas cylinder with test pressures no higher than 60 bar1)
3.10 compressed gas gas which, when packaged under pressure for transport, is entirely gaseous at all temperatures above − 50 °C NOTE This category includes all gases with a critical temperature less than or equal to − 50 °C.
1) 1 bar = 100 kPa (exactly) SIST EN ISO 25760:2015
ISO 25760:2009(E) © ISO 2009 – All rights reserved 34 General requirements 4.1 Application This clause gives general information to be considered. Clause 5 gives a choice of methods for inoperable valves. Procedures to be followed are given in Clause 6. 4.2 Hazards Especially if the cylinder is under pressure, valve removal methods pose certain hazards to the operator, such as: ⎯ stored energy from residual pressure (particularly important if the cylinder is not in a vertical position); ⎯ residual gas hazards, including ⎯ fire resulting from flammable gas ignitions NOTE Oxidizing gases in the presence of contamination can also cause severe ignition. ⎯ asphyxiation, ⎯ oxidation, ⎯ toxicity/corrosivity, ⎯ projection of pieces under pressure, ⎯ cold burns due to vaporization of liquefied gases; and ⎯ operating devalving machinery and equipment, such as pinch points, rotation and powered machines. 4.3 Operator safety and protection When an operator is removing a blocked or inoperable valve, other individuals should be on site and able to respond in case of an emergency. A risk assessment shall be performed in order to avoid the exposure of the operator and other persons who could be affected by hazards. The minimum hazards to take into account for this risk analysis are listed in 4.2. After the risk assessment is completed, risks shall be eliminated or minimized as far as reasonably practicable by engineering or process changes, such as shields or bunkers. The required or appropriate personnel protective equipment shall be chosen. 4.4 Operator qualifications 4.4.1 General All operators shall have ⎯ appropriate training, ⎯ understanding of the cylinder content, when known, and the precautions which might be necessary to prevent the release or exposure to the gas (see 4.2, 4.3 and 5.2), and ⎯ good practical understanding of the cylinder valve and the method of fitment to the cylinder. SIST EN ISO 25760:2015
ISO 25760:2009(E) 4 © ISO 2009 – All rights reserved 4.4.2 Specific process qualifications Due to additional hazards that are present, operators shall receive specific training for the processes outlined in this International Standard. Such processes can include ⎯ the pressure check, ⎯ the devalving process, ⎯ the inoperable valve process. Proper precautions shall be taken in the work area to protect operators from gas and particle discharges. Appropriate personal protection equipment shall be worn, and emergency equipment shall be readily available. Personal protection during devalving shall be adopted according to the hazards that may be present, s
...
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Plinske jeklenke – Delovni postopki za varno odstranjevanje ventilov s plinskih jeklenk (ISO 25760:2009)Gasflaschen - Verfahren für das sichere Entfernen von Ventilen aus Gasflaschen (ISO 25760:2009)Bouteilles à gaz - Modes opératoires de dépose en toute sécurité des robinets de bouteilles à gaz (ISO 25760:2009)Gas cylinders - Operational procedures for the safe removal of valves from gas cylinders (ISO 25760:2009)23.020.30MHNOHQNHPressure vessels, gas cylindersICS:Ta slovenski standard je istoveten z:FprEN ISO 25760kSIST FprEN ISO 25760:2014en,de01-november-2014kSIST FprEN ISO 25760:2014SLOVENSKI
STANDARD
kSIST FprEN ISO 25760:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
FINAL DRAFT
FprEN ISO 25760
July 2014 ICS 23.020.30 English Version
Gas cylinders - Operational procedures for the safe removal of valves from gas cylinders (ISO 25760:2009)
Bouteilles à gaz - Modes opératoires de dépose en toute sécurité des robinets de bouteilles à gaz (ISO 25760:2009) Gasflaschen - Verfahren für das sichere Entfernen von Ventilen aus Gasflaschen (ISO 25760:2009) This draft European Standard is submitted to CEN members for unique acceptance procedure. 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, 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.
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
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. FprEN ISO 25760:2014 EkSIST FprEN ISO 25760:2014
FprEN ISO 25760:2014 (E) 2 Contents Page Foreword .3
kSIST FprEN ISO 25760:2014
FprEN ISO 25760:2014 (E) 3 Foreword The text of ISO 25760:2009 has been prepared by Technical Committee ISO/TC 58 “Gas cylinders” of the International Organization for Standardization (ISO) and has been taken over as FprEN ISO 25760:2014 by Technical Committee CEN/TC 23 “Transportable gas cylinders” the secretariat of which is held by BSI. This document is currently submitted to the Unique Acceptance Procedure. Endorsement notice The text of ISO 25760:2009 has been approved by CEN as FprEN ISO 25760:2014 without any modification. kSIST FprEN ISO 25760:2014
kSIST FprEN ISO 25760:2014
Reference numberISO 25760:2009(E)© ISO 2009
INTERNATIONAL STANDARD ISO25760First edition2009-06-15Gas cylinders — Operational procedures for the safe removal of valves from gas cylinders Bouteilles à gaz — Modes opératoires de dépose en toute sécurité des robinets de bouteilles à gaz
kSIST FprEN ISO 25760:2014
ISO 25760:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
COPYRIGHT PROTECTED DOCUMENT
© ISO 2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 • CH-1211 Geneva 20 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 2009 – All rights reserved
kSIST FprEN ISO 25760:2014
ISO 25760:2009(E) © ISO 2009 – All rights reserved iiiContents Page Foreword.iv Introduction.v 1 Scope.1 2 Normative references.1 3 Terms and definitions.1 4 General requirements.3 4.1 Application.3 4.2 Hazards.3 4.3 Operator safety and protection.3 4.4 Operator qualifications.3 4.5 Operator errors.4 4.6 Special valve designs.5 5 Methods for inoperable valves.5 5.1 Summary of methods.5 5.2 Choice of method.6 6 Procedures.6 6.1 Procedures to identify and segregate cylinders with inoperable valves.6 6.2 Standard devalving procedure for treating cylinders with operable valves.7 6.3 Procedures for treating cylinders with inoperable valves.8 7 Damaged valves and cylinders.8 Annex A (informative)
Reasons cylinder valves become inoperable.9 Annex B (informative)
Examples of methods for depressurization of gas cylinders with inoperable valves.11 Bibliography.18
kSIST FprEN ISO 25760:2014
ISO 25760:2009(E) iv © ISO 2009 – All rights reserved 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 25760 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 4, Operational requirements for gas cylinders and is based on EIGA Document 129/05 Pressure receptacles with blocked or inoperable valves. EIGA has granted permission to reproduce excerpts from their document. kSIST FprEN ISO 25760:2014
ISO 25760:2009(E) © ISO 2009 – All rights reserved vIntroduction Cylinders are devalved for many purposes, such as periodic inspection and testing, cylinder cleaning, change of service, replacement of a damaged valve, installation of a new valve, preparation for filling or scrapping. Occasionally, gas cylinder valves can become blocked by corrosion or foreign material or become inoperable due to external or internal damage. It is an essential safety requirement that such valved cylinders be identified and treated with special care as soon as practicable. The operation of removing a valve should only be carried out if the cylinder is made safe with respect to residual gas and pressure. It is recommended that gas suppliers be prepared with both the proper equipment and trained operators for dealing with such valved cylinders. Practical techniques that have been tried and tested over many years within the gas industry are described. Valve removal activities can pose hazards to the life and physical safety of the operator, especially if the cylinder is under pressure. Valves should only be removed after ensuring there is no residual pressure in the cylinder.
kSIST FprEN ISO 25760:2014
kSIST FprEN ISO 25760:2014
INTERNATIONAL STANDARD ISO 25760:2009(E) © ISO 2009 – All rights reserved 1Gas cylinders — Operational procedures for the safe removal of valves from gas cylinders 1 Scope This International Standard is intended for suppliers, operators in testing facilities, operators performing cylinder maintenance and any person authorized to remove valves from gas cylinders. It details procedures for the safe removal of valves from cylinders and includes techniques for the identification of inoperable valves. Only the risks due to gas and gas mixtures under pressure are addressed; other technical issues relating to the removal of a valve from a cylinder are not covered. Some specialized equipment and procedures are in use in parts of the gas industry to safely remove cylinder valves from low pressure gas cylinders while under pressure, e.g. liquefied petroleum gas (LPG); these techniques are not included in this International Standard. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 11114-1, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1: Metallic materials ISO 11114-2, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 2: Non-metallic materials 3 Terms and definitions For the purposes of this document, the following terms and definitions apply: 3.1 gas cylinder pressure receptacle including individual cylinder, tube, pressure drum or manifold combination of these 3.2 valve device that allows gas to enter or exit a gas cylinder and retains the pressure in the cylinder when in the closed position NOTE This also includes the fittings of cylinders in bundles and battery vehicles. 3.3 inoperable valve valve that is blocked, broken or malfunctioning or that in any way prevents gas from entering or exiting the gas cylinder NOTE See Annex A. kSIST FprEN ISO 25760:2014
ISO 25760:2009(E) 2 © ISO 2009 – All rights reserved 3.4 operable valve device that allows gas to enter or exit a gas cylinder 3.5
residual pressure valve RPV type of valve that prevents the gas cylinder from being totally depressurized by holding back a specific amount of residual pressure NOTE 1 Requirements for this type of valve are specified in ISO 15996. NOTE 2 This valve type is very often associated with a non-return function. 3.6
valve with integrated pressure regulator VIPR device intended to be permanently fitted to a gas cylinder connection and comprising a shut-off valve system and pressure reduction system NOTE 1 Adapted from ISO 22435:2007, definition 3.3. NOTE 2 Requirements for this type of valve are specified in ISO 15996. 3.7 pressure relief device
PRD device that is fitted to the cylinder or cylinder valve and designed to relieve gas pressure in the event of abnormal conditions resulting in the development of excessive pressure inside the cylinder or when the cylinder is subjected to high temperatures NOTE 1 This might be a pressure relief valve, a non-reclosing PRD or a non-reclosing PRD in combination with a pressure relief valve. NOTE 2 The expression “pressure relief” is synonymous with “safety relief”, as used in various applicable regulations, codes, standards or specifications. 3.8 quick connect valve clip-on valve valve that does not contain an operating device, such as a handwheel 3.9 low pressure gas cylinder gas cylinder with test pressures no higher than 60 bar1)
3.10 compressed gas gas which, when packaged under pressure for transport, is entirely gaseous at all temperatures above − 50 °C NOTE This category includes all gases with a critical temperature less than or equal to − 50 °C.
1) 1 bar = 100 kPa (exactly) kSIST FprEN ISO 25760:2014
ISO 25760:2009(E) © ISO 2009 – All rights reserved 34 General requirements 4.1 Application This clause gives general information to be considered. Clause 5 gives a choice of methods for inoperable valves. Procedures to be followed are given in Clause 6. 4.2 Hazards Especially if the cylinder is under pressure, valve removal methods pose certain hazards to the operator, such as: ⎯ stored energy from residual pressure (particularly important if the cylinder is not in a vertical position); ⎯ residual gas hazards, including ⎯ fire resulting from flammable gas ignitions NOTE Oxidizing gases in the presence of contamination can also cause severe ignition. ⎯ asphyxiation, ⎯ oxidation, ⎯ toxicity/corrosivity, ⎯ projection of pieces under pressure, ⎯ cold burns due to vaporization of liquefied gases; and ⎯ operating devalving machinery and equipment, such as pinch points, rotation and powered machines. 4.3 Operator safety and protection When an operator is removing a blocked or inoperable valve, other individuals should be on site and able to respond in case of an emergency. A risk assessment shall be performed in order to avoid the exposure of the operator and other persons who could be affected by hazards. The minimum hazards to take into account for this risk analysis are listed in 4.2. After the risk assessment is completed, risks shall be eliminated or minimized as far as reasonably practicable by engineering or process changes, such as shields or bunkers. The required or appropriate personnel protective equipment shall be chosen. 4.4 Operator qualifications 4.4.1 General All operators shall have ⎯ appropriate training, ⎯ understanding of the cylinder content, when known, and the precautions which might be necessary to prevent the release or exposure to the gas (see 4.2, 4.3 and 5.2), and ⎯ good practical understanding of the cylinder valve and the method of fitment to the cylinder. kSIST FprEN ISO 25760:2014
ISO 25760:2009(E) 4 © ISO 2009 – All rights reserved 4.4.2 Specific process qualifications Due to additional hazards that are present, operators shall receive specific training for the processes outlined in this International Standard. Such processes can include ⎯ the pressure check, ⎯ the devalving process, ⎯ the inoperable valve process. Proper precautions shall be taken in the work area to protect operators from gas and particle discharges. Appropriate personal protection equipment shall be worn, and emergency equipment shall be readily available. Personal protection during devalving shall be adopted according to the hazards that may be present, such as those indicated in 4.2. 4.5 Operator errors As a minimum, the following possibilities shall be considered in the context of operator errors. ⎯ Incorrectly assuming that a cylinder has no pressure (e.g. placing valved cylinders that have been checked
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