DIN EN ISO 25760-2015 Gas cylinders - Operational procedures for the safe removal of valves from gas cylinders (ISO 25760 2009) German version EN ISO 25760 2015《气瓶 将阀门从气瓶下安全移除的操作程序.pdf

1、April 2015 Translation by DIN-Sprachendienst.English price group 13No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS

2、23.020.30!%B2*“2311507www.din.deDDIN EN ISO 25760Gas cylinders Operational procedures for the safe removal of valves from gascylinders (ISO 25760:2009);English version EN ISO 25760:2015,English translation of DIN EN ISO 25760:2015-04Gasflaschen Verfahren fr das sichere Entfernen von Ventilen aus Gas

3、flaschen (ISO 25760:2009);Englische Fassung EN ISO 25760:2015,Englische bersetzung von DIN EN ISO 25760:2015-04Bouteilles gaz Modes opratoires de dpose en toute scurit des robinets de bouteilles gaz(ISO 25760:2009);Version anglaise EN ISO 25760:2015,Traduction anglaise de DIN EN ISO 25760:2015-04www

4、.beuth.deDocument comprises 24 pagesIn case of doubt, the German-language original shall be considered authoritative.03.15DIN EN ISO 25760:2015-04 2 A comma is used as the decimal marker. National foreword The text of ISO 25760:2009 has been prepared by Technical Committee ISO/TC 58 “Gas cylinders”

5、and has been taken over as EN ISO 25760:2015 by Technical Committee CEN/TC 23 “Transportable gas cylinders” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was the DIN-Normenausschuss Druckgasanlagen (DIN Standards Committee Pressurized Gas Installations),

6、 Working Committee NA 016-00-03 AA Druckgasflaschen und Ausrstung. Before applying this standard, users of this standard are to verify whether the provisions of laws and regulations have been met, particularly those regarding occupational safety and health. The DIN Standards corresponding to the Int

7、ernational Standards referred to in this document are as follows: ISO 10156-2 DIN EN ISO 10156-2 ISO 10462 DIN EN ISO 10462 ISO 11114-1 DIN EN ISO 11114-1 ISO 11114-2 DIN EN ISO 11114-2 ISO 15996 DIN EN ISO 15996 ISO 22435 DIN EN ISO 22435 National Annex NA (informative) Bibliography DIN EN ISO 1015

8、6-2, Gas cylinders Gases and gas mixtures Part 2: Determination of oxidizing ability of toxic and corrosive gases and gas mixtures DIN EN ISO 10462, Gas cylinders Acetylene cylinders Periodic inspection and maintenance DIN EN ISO 11114-1, Gas cylinders Compatibility of cylinder and valve materials w

9、ith gas contents Part 1: Metallic materials DIN EN ISO 11114-2, Gas cylinders Compatibility of cylinder and valve materials with gas contents Part 2: Non-metallic materials DIN EN ISO 15996, Gas cylinders Residual pressure valves General requirements and type testing DIN EN ISO 22435, Gas cylinders

10、Cylinder valves with integrated pressure regulators Specification and type testing EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE 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) Bout

11、eilles gaz - Modes opratoires de dpose en toute scurit des robinets de bouteilles gaz (ISO 25760:2009)Gasflaschen - Verfahren fr 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

12、 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

13、 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 a

14、s 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, Ne

15、therlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All

16、rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 25760:2015 EContents Page Foreword. 3 Introduction 4 1 Scope . 5 2 Normative references . 5 3 Terms and definitions. 5 4 General requirements. 7 4.1 Application 7 4.2 Hazards 7 4.3 Operat

17、or safety and protection . 7 4.4 Operator qualifications. 7 4.5 Operator errors . 8 4.6 Special valve designs. 9 5 Methods for inoperable valves 9 5.1 Summary of methods . 9 5.2 Choice of method 10 6 Procedures 10 6.1 Procedures to identify and segregate cylinders with inoperable valves 10 6.2 Stand

18、ard devalving procedure for treating cylinders with operable valves. 11 6.3 Procedures for treating cylinders with inoperable valves 12 7 Damaged valves and cylinders . 12 Annex A (informative) Reasons cylinder valves become inoperable . 13 Annex B (informative) Examples of methods for depressurizat

19、ion of gas cylinders with inoperable valves . 15 Bibliography . 22 2EN ISO 25760:2015 (E) DIN EN ISO 25760:2015-04 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 ove

20、r 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 conf

21、licting 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

22、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, Gree

23、ce, 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 witho

24、ut any modification. 3EN ISO 25760:2015 (E) DIN EN ISO 25760:2015-04 Introduction 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

25、. 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 remov

26、ing 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 t

27、ested 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. 4EN ISO 25

28、760:2015 (E) DIN EN ISO 25760:2015-04 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 cyl

29、inders 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 part

30、s 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 appli

31、cation 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: Me

32、tallic 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 includin

33、g 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 ino

34、perable 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. 5EN ISO 25760:2015 (E) DIN EN ISO 25760:2015-04 3.4 operable valve device that allows gas to enter or exit a gas cylinder 3.5 residual pressure va

35、lve 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 wi

36、th 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.

37、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 mi

38、ght 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 c

39、lip-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 T

40、his category includes all gases with a critical temperature less than or equal to 50 C. 1) 1 bar = 100 kPa (exactly) 6EN ISO 25760:2015 (E) DIN EN ISO 25760:2015-04 4 General requirements 4.1 Application This clause gives general information to be considered. Clause 5 gives a choice of methods for i

41、noperable 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

42、); 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;

43、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 shal

44、l 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 pra

45、cticable 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 prec

46、autions 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. 7EN ISO 25760:2015 (E) DIN EN ISO 25760:2015-04 4.4.2 Specific process qualifications Due to additi

47、onal 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 operat

48、ors 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 A

49、s 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 with valved cylinders that have not been checked). Incorrectly assuming that a cylinder has been checked for pressure (e.g. devalving more than one cylinder at the same time could lead to this error). Incorrectly assuming that a cylinder is empty of a liquefied gas, based upon the