ISO 10297:2014 ガスボンベ — ボンベバルブ — 仕様とタイプのテスト | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives

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The committee responsible for this document is ISO/TC 58, Gas cylinders, Subcommittee SC 2, Cylinder fittings.

This third edition cancels and replaces the second edition (ISO 10297:2006), which has been technically revised.

The main technical modifications are:

• a) Scope: inclusion of main valves and valves with integrated pressure regulator (VIPR), exclusion of quick-release valves, non-return valves and ball valves;
• b) Terms, definitions and symbols: introduction of new definitions and adaptation of existing definitions;
• c) Valve description: new clause with figures and general description;
• d) Valve design requirements:
  • 1) General: inclusion of additional requirement of internal leak tightness at −40 °C during transport and storage;
  • 2) Materials: deletion of requirements already given in ISO 11114-1 and ISO 11114-2; deletion of ageing sensitivity test for non-metallic materials; addition of requirement on ductility of valve body material; addition of requirement on suitability of lubricants for valve test pressure;
  • 3) Dimensions: deletion of requirement on bore of the valve with regard to flow requirement and adaption of requirements for valves fitted with a valve protection cap according to ISO 11117;
  • 4) Valve connections: addition of requirements for separate valve filling connection;
  • 5) Resistance to mechanical impact: addition of requirement for impact testing valves protected by a valve guard but fixed only to the valve, modification of acceptance criteria;
  • 6) Valve operating mechanism: inclusion of allowance to increase the endurance torque for some valve designs and to adjust compressed packed valves during endurance testing; replacement of acetylene flashback test by alternative tests without using acetylene and addition of acetylene decomposition test for main valves; modification of acceptance criteria;
  • 7) Valve operating device: addition of requirement on the handwheel diameter required to achieve the minimum closing torque; modification of acceptance criteria for flame impingement test;
  • 8) Resistance to ignition: addition of requirement of oxygen pressure surge testing for certain cylinder valves for gas mixtures containing oxygen and other oxidizing gases and of detailed information on acceptance criteria; addition of mandatory reference to oxygen pressure surge test for VIPR specified in ISO 22435 or ISO 10524-3 and for cylinder valves with residual pressure devices specified in ISO 15996;

• e) Production requirements: deletion of all respective requirements but reference to ISO 14246 in scope;

• f) Type testing:

  • 1) General: addition of requirements for repeating tests depending on applied changes for a valve design;
  • 2) Documentation: addition of detailed information on documentation required;
  • 3) Test samples: addition of requirement to have pressure gauges/indicators fitted;
  • 4) Test report: addition of detailed information required;
  • 5) Test pressures: adaption of information on burst test pressure (former hydraulic test pressure);
  • 6) Test gas: addition of requirement for using helium or hydrogen or an inert mixture of these gases for the leak tightness tests for cylinder valves for helium and hydrogen and their mixtures; extension of requirements on gas quality;
  • 7) Test schedule: deletion of ageing as preconditioning and leak tightness test before ageing; addition of internal leak tightness test at −40 °C after endurance test; adaption of oxygen pressure surge test for cylinder valves with lubricants not rated for valve test pressure; listing of impact test;
  • 8) Hydraulic burst pressure test: addition of testing the valve in closed position;
  • 9) Excessive torque tests: addition of requirement to carry out the test with the valve operating device in place; differentiation between handwheel and key/toggle operated valves; extension of tests with requirement of two additional test samples;
  • 10) Leak tightness tests: reference to informative Annex E for an example of a vacuum test; unification of the lower test pressure of 0,5 bar for all gases; implementation of internal leak tightness test at −40 °C; addition of information on required position of the valve operating mechanism for external leak tightness test; adaption of requirement for test order for all required test pressures; adaption of requirement for changing and maintaining the different test temperatures; adaption of requirement for minimum closing torque;
  • 11) Endurance test: addition of requirement to carry out the test with the handwheel in place and of description of procedure for increasing the endurance torque for some valve designs;
  • 12) Visual examination: addition of separate sub-clause for visual examination with detailed information on acceptance criteria;
  • 13) Oxygen pressure surge test: information on test installation and test procedure transferred to normative Annex C; addition of detailed information on determination of pressure rise time; addition of divergent installation requirements for testing main valves; addition of detailed information on acceptance criteria;
  • 14) Acetylene test: information transferred to normative Annex B;
  • 15) Impact test: addition of information on the valving torque according to ISO 13341 to be used; addition of subsequent hydraulic burst pressure test and internal leak tightness test; modification of test procedure;
  • 16) Marking: addition of requirement for marking cylinder valves oxygen pressure surge tested via different connections and of detailed information on marking of valve inlet, valve outlet and separate valve filling connections;
  • 17) Example of test sequence: information transferred from informative Annex B to informative Annex D and adaptation according to new requirements for valve designs and changes and material specifications within a valve design;
  • 18) Addition of informative Annex E, giving an example of a vacuum test;
  • 19) Endurance test equipment and procedure: information transferred from normative Annex C to normative Annex F.

• g) full editorial rework.