ISO-15995-2006.pdf

Reference number ISO 15995:2006(E) INTERNATIONAL STANDARD ISO 15995 First edition 2006-02-15 Gas cylinders Specifications and testing of LPG cylinder valves Manually operated Bouteilles à gaz Spécifications et essais pour valves de bouteilles de GPL Fermeture manuelle © ISO 2006 ISO 15995:2006(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. © ISO 2006 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 copyrightiso.org Web www.iso.org Published in Switzerland ii © ISO 2006 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Design and specification . 4 4.1 General. 4 4.2 Materials 4 4.3 Essential components 5 4.4 Optional components . 6 4.5 Leak tightness. 7 4.6 Operating torque. 7 4.7 Opening torque . 8 4.8 Closing torque. 8 5 Valve type test. 8 5.1 General. 8 5.2 Test procedure and test requirements . 8 5.3 External and internal tightness tests (Test nos. 2, 5, 8, 11, 12, 13, 15, 16 and 17). 8 5.4 Hydraulic pressure test (Test no. 1) 10 5.5 External and internal tightness test (Test no. 2) . 10 5.6 Valve closure test (Test no. 3) . 11 5.7 Valve stem test (Test no. 4) . 11 5.8 External and internal tightness test (Test no. 5) . 11 5.9 Hand wheel fire exposure test (Test no. 6) 12 5.10 Impact test (Test no. 7). 12 5.11 External and internal tightness test (Test no. 8) . 13 5.12 Resistance to excessive closing torque test (Test no. 9). 13 5.13 Resistance to excessive opening torque test (Test no. 10) . 13 5.14 External tightness test (Test no. 11) . 14 5.15 External and internal tightness test (Test no. 12) . 14 5.16 External and internal tightness test after ageing (Test no. 13) 14 5.17 Endurance test (Test no. 14) 14 5.18 External and internal tightness test (Test no. 15) . 15 5.19 External and internal tightness test High temperature (Test no. 16) 15 5.20 External and internal tightness test Low temperature (Test no. 17). 15 5.21 Examination of dismantled valves number 9 to 13 (Test number 18) . 15 5.22 Acceptance criteria. 15 6 Documentation/Test report 15 6.1 Documentation 15 6.2 Test report . 16 7 Markings 16 Annex A (normative) Valve dimensions. 17 Annex B (normative) Valves for cylinders up to and including 7,5 litre water capacity. 18 Annex C (informative) Production testing and inspection. 20 Annex D (normative) Special low temperature requirements for valves 21 Bibliography . 22 © ISO 2006 All rights reserved ISO 15995:2006(E) iv 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 15995 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 2, Cylinder fittings. © ISO 2006 All rights reserved ISO 15995:2006(E) v Introduction This International Standard calls for the use of substances and procedures that can be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. It has been assumed in the drafting of this International Standard that execution of its provisions is entrusted to appropriately qualified and experienced people. © ISO 2006 All rights reserved ISO 15995:2006(E) v 1 Gas cylinders Specifications and testing of LPG cylinder valves Manually operated 1 Scope This International Standard specifies the requirements for design, specification and type testing of dedicated LPG manually operated cylinder valves specifically for use with transportable refillable LPG cylinders from 0,5 l up to 150 l water capacity. It includes references to associated equipment for vapour or liquid service. NOTE Annex C gives the recommendations for production testing and inspection. This International Standard does not apply to fixed automotive installations. 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 10920, Gas cylinders 25E taper thread for connection of valves to gas cylinders Specification 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 ISO 11116-1, Gas cylinders 17E taper thread for connection of valves to gas cylinders Part 1: Specifications 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 liquefied petroleum gas LPG mixture of predominantly butane or propane with traces of other hydrocarbon gases classified in accordance with UN number 1965, hydrocarbon gas mixture, liquefied, or NOS or UN number 1075, petroleum gases, liquefied NOTE In some countries, UN number 1011 and UN number 1978 may also be used to designate LPG. 3.2 cylinder valve valve designed for use in one or more of the following applications: liquid filling, liquid service, vapour service or liquid level indication © ISO 2006 All rights reserved INTERNATIONAL STANDARD ISO 15995:2006(E) 2 3.3 external tightness resistance to leakage through the valve body to or from the atmosphere, when the valve is open 3.4 internal tightness resistance to leakage across the valve seat, or other internal sealing components when the valve is closed 3.5 eduction tube tube fitted to the valve to allow withdrawal of liquid LPG with the cylinder in its normal operating position 3.6 fixed liquid level gauge control device, such as a dip tube in combination with a vent valve to verify that the predetermined maximum liquid level in a cylinder has been reached or surpassed 3.7 liquid level indicator control device, such as a float gauge, permitting the gauging of the liquid level in the cylinder 3.8 valve body major valve component including valve stem and/or valve outlet and, where applicable, the provision for other optional components 3.9 excess flow device (flow limiter) device designed to close or partially close when the flow of liquid or vapour passing through it exceeds a predetermined value and to re-open when the pressure differential across the valve has been restored below a certain value 3.10 non-return valve valve designed to close automatically to restrict reverse flow 3.11 vapour/liquid dual valve valve designed to allow vapour and liquid withdrawal from a cylinder in its normal operating position 3.12 sealing element element used to obtain internal leak tightness 3.13 valve stem section of the valve body, which connects to the cylinder 3.14 valve outlet section of the valve body to which a regulator or connector can be fitted for vapour or liquid withdrawal NOTE The valve outlet is also normally used for filling the cylinder. 3.15 type test test or series of tests conducted to prove that the design meets the requirements of this International Standard © ISO 2006 All rights reserved ISO 15995:2006(E) 3 3.16 cylinder opening part of the cylinder to which the valve stem connects 3.17 test pressure pressure at which the valve or component is tested in bar gauge 3.18 sediment tube device designed to reduce the risk of foreign matter, which can be in the cylinder, entering the valve 3.19 sealing cap device fitted to, or integral with, the outlet of the cylinder valve to provide secondary closure 3.20 valve operating mechanism mechanism which closes and opens the valve orifice, e.g. threaded valve spindle which, when rotated, raises and lowers a seal 3.21 sealing mechanism mechanism to obtain internal leak tightness 3.22 operating torque torque during opening or closing the valve, after the first half rotation of the hand wheel in opening the valve and before the last half rotation of the hand wheel in closing the valve 3.23 opening torque initial torque required to open the valve from the closed position 3.24 closing torque torque required to close the valve and obtain internal tightness 3.25 protection cap device that may be screwed to a fitting permanently attached to the cylinder to protect a cylinder valve 3.26 shroud/guard device that may be welded to the cylinder to protect a cylinder valve 3.27 gross mass mass of the heaviest cylinder on which the valve is intended to be fitted, including any permanently attached accessories and the maximum mass of the LPG content 3.28 pressure relief valve valve which automatically, without the assistance of any energy other than that of the fluid concerned, discharges a quantity of fluid so as to prevent a predetermined safe pressure being exceeded, and which is designed to re-close and prevent the further flow of fluid after normal pressure conditions of service have been restored NOTE The loading due to the fluid pressure underneath the valve-sealing element is opposed by a spring. © ISO 2006 All rights reserved ISO 15995:2006(E) 4 4 Design and specification 4.1 General 4.1.1 The valve shall be capable of withstanding: ? operating pressures and test pressures; ? mechanical stresses, including dynamic loads such as pressure shocks or cyclic changes; ? operating temperatures. NOTE Pressures are gauged unless otherwise specified. 4.1.2 There shall be valve external and internal leak tightness for the full range of pressure and temperature conditions. 4.1.3 The specific requirements relating to the functions, mechanical strength, pressure, operating temperatures, external and internal leak tightness of the valve and its components, are detailed in the following subclauses of this clause and/or in the relevant test of Clause 5. 4.2 Materials 4.2.1 General Materials in contact with LPG shall be physically and chemically compatible with LPG under all operating conditions for which the valve is designed (see ISO 11114-1 and ISO 11114-2). In selecting an appropriate material for valve components, it is important to select not only for adequate strength in service, but also to give consideration to other modes of failure due to atmospheric corrosion, brass dezincification, stress corrosion, shock loads, and material failure. 4.2.2 Operating temperatures Materials used shall be suitable for the temperatures for which the valve is designed. The minimum operating temperature to which the valve is expected to be exposed during normal use is minus 20 °C. In service, temperatures below this may be encountered during short periods, for example, during filling. Where necessary, e.g. in some countries and for certain applications, lower minimum operating temperatures shall be used. When equipment is designed for a temperature of minus 40 °C, it shall also meet the requirements of Annex D. The maximum operating temperature to which the valve is expected to be exposed during normal operation is 65 °C. In service, this temperature may be exceeded for short periods. 4.2.3 Copper alloys Valve bodies made from copper alloys shall be manufactured from materials in accordance with recognized standards, e.g. EN 12164 and EN 12165, or from alloys of equivalent properties and standards. 4.2.4 Non-metallic materials Non-metallic materials in contact with LPG shall be compatible with LPG, e.g. ISO 11114-2. They shall not distort, harden or adhere to the body or seat face to such an extent as to impair the function of the valve. © ISO 2006 All rights reserved ISO 15995:2006(E) 5 In accordance with national or international standards, for example EN 549, non-metallic materials in contact with LPG shall meet the requirements for resistance to: ? gas (pentane test); ? lubricants; ? ageing; ? low temperature; ? high temperature; ? compression; ? ozone (where the material is exposed to the atmosphere). 4.3 Essential components 4.3.1 Valve operating mechanism The valve operating mechanism normally includes a hand wheel. The valve operating mechanism shall be designed in such a way that it remains captive and achieves direct contact with the valve body in the absence of the sealing element, in order to limit the leakage rate of gas. Under normal use, the valve shall operate without difficulty even after prolonged use and shall satisfy the requirements of 5.17. The operating mechanism shall withstand an opening and closing torque in accordance with 5.12 and 5.13. When a torque is applied in excess of that given in 5.12 and 5.13 the operating mechanism shall not disassemble from the valve body and create a leak. However, the operating mechanism may break or become inoperable. The materi