1、 Reference number ISO 23551-2:2006(E) ISO 2006INTERNATIONAL STANDARD ISO 23551-2 First edition 2006-07-01 Safety and control devices for gas burners and gas-burning appliances Particular requirements Part 2: Pressure regulators Dispositifs de commande et de scurit pour brleurs gaz et appareils gaz E
2、xigences particulires Partie 2: Rgulateurs de pression ISO 23551-2:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and i
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5、d, 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
6、writing from either ISO at the address below or ISOs 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 reservedISO 23
7、551-2:2006(E) ISO 2006 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms, definitions and symbols 1 3.1 Regulators . 1 3.2 Pressures. 2 3.3 Flow rates 3 3.4 Component parts 3 3.5 Performance 3 4 Classification. 4 4.1 Classes of control. 4
8、 4.2 Groups of controls 4 5 Test conditions . 4 6 Construction 5 6.1 General. 5 6.2 Construction requirements 5 6.3 Materials 6 6.4 Gas connections. 6 7 Performance 6 7.1 General. 6 7.2 Leak-tightness. 6 7.3 Torsion and bending 7 7.4 Rated flow rate 8 7.5 Durability . 8 7.6 Functional requirements 8
9、 7.7 Putting the regulator out of action 8 7.8 Long-term performance . 8 7.9 Lock-up pressure 9 8 EMC/Electrical requirements. 9 9 Marking, installation and operating instructions 9 9.1 Marking 9 9.2 Installation and operating instructions 10 9.3 Warning notice 10 Annex A (informative) Classificatio
10、n of fuel gases into gas families . 11 Annex B (normative) Functional requirements and regulator performance testing Method A. 13 Annex C (normative) Functional requirements and regulator performance testing Method B. 22 Annex D (normative) Specific performance testing in Japan 36 Annex E (informati
11、ve) Typical regulators and regulator parts 37 Bibliography . 38 ISO 23551-2:2006(E) iv ISO 2006 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standar
12、ds 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
13、 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
14、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
15、 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 23551-2 was prepared by Technical Committee ISO/TC 161, Control and protective devices for gas and oil burners and gas and oil burning
16、 appliances. ISO 23551 consists of the following parts, under the general title Safety and control devices for gas burners and gas-burning appliances Particular requirements: Part 1: Automatic valves Part 2: Pressure regulators Part 3: Gas/air ratio controls, pneumatic type Part 4: Valve-proving sys
17、tems for automatic shut-off valves ISO 23551-2:2006(E) ISO 2006 All rights reserved v Introduction This part of ISO 23551 is designed to be used in conjunction with ISO 23550:2004. This part of ISO 23551 either references existing requirements of ISO 23550:2004 or indicates that there has been an “a
18、ddition”, “modification” or “replacement” in the cited requirement of ISO 23550:2004. INTERNATIONAL STANDARD ISO 23551-2:2006(E) ISO 2006 All rights reserved 1 Safety and control devices for gas burners and gas-burning appliances Particular requirements Part 2: Pressure regulators 1 Scope This part
19、of ISO 23551 specifies safety, constructional and performance requirements for pressure regulators intended for use with gas burners and gas-burning appliances. It also describes the test procedures for checking compliance with these requirements and provides information necessary for the purchaser
20、and user. This part of ISO 23551 applies to pressure regulators for gas burners and gas-burning appliances of nominal connection size up to and including DN 250 that can be used and tested independently of these appliances. These regulators are suitable for fuel gases, such as natural gas, manufactu
21、red gas or liquefied petroleum gas (LPG) at inlet pressures up to and including 50 kPa. This part of ISO 23551 covers type testing only. This part of ISO 23551 does not cover a) regulators connected directly to the mains pipe work or to a container that maintains a standard distribution pressure; b)
22、 regulators installed outdoors and exposed to the environment; c) regulators which use electrical auxiliary energy. 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 refe
23、rences, the latest edition of the referenced document (including any amendments) applies. ISO 23550:2004, Safety and control devices for gas burners and gas-burning appliances General requirements 3 Terms, definitions and symbols For the purpose of this document, the terms and definitions given in I
24、SO 23550:2004 and the following apply. 3.1 Regulators 3.1.1 pressure regulator device that maintains the outlet pressure constant within given limits, independently of the variations in inlet pressure and/or flow rate ISO 23551-2:2006(E) 2 ISO 2006 All rights reserved3.1.2 adjustable pressure regula
25、tor regulator provided with means for changing the outlet pressure setting 3.2 Pressures 3.2.1 test pressure pressure to be applied during a test 3.2.2 pressure drop differential pressure with valve open to its fullest extent 3.2.3 maximum inlet pressure p 1maxhighest inlet pressure at which tests h
26、ave been conducted to determine that the regulator is able to control the outlet pressure within acceptable limits as declared by the manufacturer 3.2.4 minimum inlet pressure p 1minlowest inlet pressure at which tests have been conducted to determine that the regulator is able to control the outlet
27、 pressure within acceptable limits declared by the manufacturer 3.2.5 inlet pressure range range of inlet pressure between the maximum and minimum values 3.2.6 maximum outlet pressure p 2maxhighest outlet pressure at which tests have been conducted to determine that the regulator is able to control
28、the outlet pressure within acceptable limits declared by the manufacturer 3.2.7 minimum outlet pressure p 2minlowest outlet pressure at which tests have been conducted to determine that the regulator is able to control the outlet pressure within acceptable limits declared by the manufacturer 3.2.8 o
29、utlet pressure range range of outlet pressure between the maximum and minimum values 3.2.9 setting point inlet and outlet pressures declared by the manufacturer, at which the regulator is initially adjusted for test purposes at a declared flow rate NOTE The respective pressures and flow rate are ter
30、med “inlet setting pressure”, “outlet setting pressure” and “setting flow rate”. ISO 23551-2:2006(E) ISO 2006 All rights reserved 3 3.3 Flow rates 3.3.1 maximum flow rate q maxmaximum rate, as a function of inlet and outlet pressures, declared by the manufacturer and expressed in m 3 h 1of air at st
31、andard conditions NOTE For a non-adjustable regulator, there is only one maximum flow rate. 3.3.2 minimum flow rate q minminimum rate, as a function of inlet and outlet pressures, declared by the manufacturer and expressed in m 3 h 1of air at standard conditions NOTE For a non-adjustable regulator,
32、there is only one minimum flow rate. 3.3.3 flow rate range range of flow rate between the maximum and minimum values 3.4 Component parts 3.4.1 breather hole orifice that allows atmospheric pressure to be maintained in a compartment of variable volume 3.4.2 diaphragm flexible member which, under the
33、influence of the forces arising from loading and pressure, operates the valve 3.4.3 diaphragm plate stiffening plate fitted to the diaphragm 3.4.4 valve device which varies the gas flow directly 3.5 Performance 3.5.1 lock-up pressure outlet pressure at which a regulator closes when the outlet of the
34、 regulator is sealed NOTE The increase in outlet pressure is expressed either in kilopascals or as a percentage. 3.5.2 put out of action verb inactivate a regulator, thereby ensuring that this setting does not undergo any changes ISO 23551-2:2006(E) 4 ISO 2006 All rights reserved4 Classification 4.1
35、 Classes of control Pressure regulators are classified as class A, class B or class C, according to the appropriate inlet pressure and flow rate limits, as given in Table 1. NOTE 1 In the USA, regulators are classified either for main burner load application or for main burner and pilot load applica
36、tion. NOTE 2 In Japan, pressure regulators are not classified. Table 1 Deviation of outlet pressure from outlet setting pressure Maximum outlet pressure deviation a% Class of regulators Manufactured gas Natural gas Liquefied petroleum gas Class A: q maxto q minand p 1maxto p 1min 15 15 15 by variati
37、on of the inlet pressure for each of the flow rates 15 20 + 10 15 + 10 Class B: by variation of flow rates from q maxto q min(constant inlet pressure) for each of the inlet pressures 40 0 +40 0 +40 0 +Class C: at constant q (within the flow rate range) 15 20 + 10 15 + 10 NOTE 1 Classification of fue
38、l gases see Annex A.aSee Annex A. 4.2 Groups of controls A regulator is classified as group 1 or group 2, according to the bending stresses that it is required to withstand in accordance with ISO 23550:2004, Table 3. Group 1 regulators: Regulator intended for use in an appliance and/or installation
39、where it is not subjected to bending stresses imposed by the pipe work (e.g. by the use of rigid adjacent supports); Group 2 regulators: Regulator for use in any situation, either internal or external to the appliance, typically without support. NOTE A regulator that complies with the requirements f
40、or group 2 can be deemed to comply also with the requirements for group 1 regulators. 5 Test conditions ISO 23550:2004, Clause 5, shall apply. NOTE Specific requirements for testing are given in Annexes B and C. ISO 23551-2:2006(E) ISO 2006 All rights reserved 5 6 Construction 6.1 General ISO 23550:
41、2004, 6.1, shall apply. 6.2 Construction requirements ISO 23550:2004, 6.2, shall apply, except as in 6.2.1 to 6.2.3: 6.2.1 Breather holes ISO 23550:2004; 6.2.3, shall apply with the addition of 6.2.1.1 and 6.2.1.2: 6.2.1.1 Vent limiters Vent limiters used with regulators shall limit the flow through
42、 the vent of the regulator as shown in Table 2 when tested at room temperature. Table 2 Maximum allowable vent limiter venting rate Maximum allowable flow rate Type of vent limiter Specific gravity cm 3 /s (ft 3 /h) Vent limiter for use only with natural, manufactured, mixed gases and LP gas-air mix
43、tures 0,64 19,7 (2,5) Vent limiter for use with liquefied petroleum gas 1,53 7,87 (1,0) 6.2.1.2 Separate vent limiters test Separate vent limiters shall be installed in an upright position in a gas-tight piping system so that the test medium passes through the vent limiter. It shall then be determin
44、ed that there is no leakage at the points other than through the vent limiter. The rate of flow through the test meter shall be determined at pressures from 498 Pa (2 in water column) up to and including the maximum working pressure of the regulator and corrected for a specific gravity of 1,53 for v
45、ent limiters for use with liquefied petroleum gases, and a specific gravity of 0,64 for vent limiters for use only with natural, manufactured, mixed gases and LP gas-air mixtures. The corrected flow rate shall not exceed the maximum allowable specified values. If the vent limiter is not a limiting o
46、rifice type and is designed for use in positions other than upright, additional test to determine the rate of flow shall be conducted when the vent limiter is installed in other positions. When the vent limiter is an integral part of the regulator, the regulator diaphragm shall be substantially remo
47、ved to permit the test medium to flow feely through the vent limiter. With the regulator installed in a gas- tight piping system in the manufacturers specified upright position, the flow rate through the integral vent limiter shall be determined as described for separate vent limiters. The corrected
48、 flow rate shall not exceed the maximum allowable specified values. Additional tests to determine the rate of flow shall be conducted with the regulator in any other position for which compliance with this standard is desired. 6.2.2 Sealing caps ISO 23550:2004, 6.2.7, shall be replaced with the foll
49、owing: Sealing caps on field adjustable regulators shall be capable of being removed and replaced using standard tools and shall be capable of being sealed (e.g. by lacquer). A sealing cap shall not hinder adjustment with the outlet pressure range declared by the manufacturer. ISO 23550:2004, 6.2, shall apply with the addition of 6.2.3. ISO 23551-2:2006(E) 6 ISO 2006 All rights reserved6.2.3 Adjustment means Adjustable type regulators and the adjustable stages of multi-stage regul
