AGA B109.4-1998 Self-Operated Diaphragm-Type Natural Gas Service Regulators (XQ9802)《自动膜式天然气工作调节器》.pdf

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1、STDnAGA BLO914-ENGL 1998 900BB3b 0000b77 123 m ANSI 61 09.4-1998 Approved April 23, 1998 SELF-OPERATED DIAPHRAGM-TYPE NATURAL GAS SERVICE REGULATORS Catalog No. XQ9802 August 1998 STD-AGA B109.4-ENGL 1998 II 9008836 0000678 OLT ANSI B109.4 American National Standard Approved: April 23,1998 SELF-OPER

2、ATED DIAPHRAGM-TYPE NATURAL GAS SERVICE REGULATORS For Nominal Pipe Size 1 % inches (32 mm) and smaller with outlet pressures of 14 inches water column (3.48 kPa) and less. Secretariat American Gas Association Operating Section 15 15 Wilson Boulevard Arlington, VA 22209 U.S.A. Catalog No. XQ9802 Aug

3、ust 1998 STDoAGA BLOS-I-ENGL 1998 m 9008836 0000b79 TTb m DISCLAIMERS AND COPYRIGHT Nothing contained in this ANSI standard is to be construed as granting any right, by implication or otherwise, for the manufacture, sale or use in connection with any method, apparatus or product covered by letters p

4、atent, or as insuring anyone against liability for infringement of letters patent. This standard may be used by anyone desiring to do so. Efforts have been made to ensure the accuracy and reliability of the data contained in this publication; however, ANSI and A.G.A. make no representation, warranty

5、 or guarantee in connection with this standard and hereby expressly disclaim any liability or responsibility for loss or damage resulting from its use; for any violation of any federal, state or municipal regulation with which this standard may conflict; or for the infringement of any patent from th

6、e use of this standard. Nothing contained in this standard should be viewed as an endorsement by ANSI1A.G.A. of any particular manufacturers products. Permission is granted to republish material herein in laws or ordinances, and in regulations, administrative orders, or similar documents issued by p

7、ublic authorities. Those desiring permission for other publication should consult the American Gas Association, 151 5 Wilson Boulevard, Arlington, VA 22209, U.S.A. Copyright O 1998 American Gas Association, All Rights Reserved i STD-AGA BL07-4-ENGL 1798 = 700883b 0000b80 718 PREFACE This publication

8、 presents a basic standard for the safe and reliable operation, and the substantial and durable construction of self-operated diaphragm-type natural gas service regulators, for nominal pipe size of 1% inches (32 mm) and smaller with outlet pressure of 14 inches water column (3.48 kpa) and less. This

9、 work is the result of years of experience, supplemented by extensive research. The standard is intended to meet the minimum design, material, performance and testing requirements for efficient use of service regulators. It is recognized that during any transition period to the metric system, sizes

10、and dimensions need to be expressed in either the metric system or the inch-pound system or in both. In this document, both systems are used, with the inch-pound units given preference. In most cases, a soft conversion fiom existing inch-pound values is shown. Soft conversion implies a change in nom

11、enclature only; in this document, the alternative nomenclatures (metric and inch-pound) are shown by using parentheses and can be used interchangeably. Nothing in this standard is to be considered as in any way indicating a measure of quality beyond compliance with the provisions it contains. It is

12、designed to allow the construction and performance of service regulators that may exceed the various provisions specified in any respect. In this standards preparation, recognition was intended to be given to the possibiliy of improvement, through ingenuity of design or otherwise. As progress takes

13、place, revisions may become necessary. Whenever such revisions are believed desirable, recommendations should be forwarded to the Chairman of ANSI B109 Committee, American Gas Association, 15 15 Wilson Boulevard, Arlington, VA 22209, U.S.A. Users of this document should consult applicable federal, s

14、tate and local regulations. The American Gas Association (A.G.A.) does not, by the publication of this document, intend to present specifications that are not in compliance with applicable rules, and this document may not be construed as doing so. NOTICE: This American National Standard may be revis

15、ed or withdrawn at any time. The procedures of the American National Standards Institute, Inc., (ANSI) require that action be taken to reaffirm, revise or withdraw this standard no later than five years fiom the date of publication. Whenever any revisions are deemed advisable, recommendations should

16、 be forwarded to the American Gas Association. A form is included for that purpose at the end of this standard. Purchasers of American National Standards may receive current information on all standards by writing to the American National Standards Institute, Inc., 11 West 42nd Street, New York, NY

17、10036, U.S.A.; by calling (212) 642-4900; by faxing ANSI at (212) 398-0023; or by visiting ANSIs World Wide Web site at http:/www.ansi.org. To purchase additional copies, contact: A.G.A. Distribution Center, P.O. Box 79230, Baltimore, MD 2 1279-0230; Fax: (301) 206-9789; Phone: (301) 617-7819. II ST

18、D=AGA BL07.4-ENGL 1998 = 9008836 000068l b54 HISTORY OF DEVELOPMENT OF THE STANDARD FOR SELF-OPERATED DIAPHGRAM-TYPE GAS SERVICE REGULATORS In December 1989 at an ad hoc meeting, representatives of the ANSI 2223.1 and 221 committees, A.G.A., Gas Appliance Manufacturers Association (GAMA) and several

19、 other industry organizations recommended that an ANSI standard for service regulators be developed. It was recognized that a systems approach to pressure control and over-pressure protection was necessary to ensure consistency between the ANSI standards that cover the houseline and the utilization

20、equipment. In April 1990, a revision that added service regulators to the scope of ANSI B 109 ASC was approved. The A.G.A. Operating Section assembled a service regulator standard development task group with representatives from the A.G.A. Distribution Measurement Committee, Customer Service and Uti

21、lization Committee, and Distribution Engineering Committee, and the major service regulator manufacturers. A representative from the committee on Canadian Gas Service Regulator Standard was also included. Throughout the development, consideration was given to harmonizing the new standard with the Ca

22、nadian standard. A first draft was completed in 1993. The draft was revised a number of times and was approved by the A.G.A. Operating Section before it was presented to the ANSI B109 Committee in January 1996. The ANSI B109 Accredited Standard Committee requested comments on the proposed service re

23、gulator standard in May 1996. During a public meeting on January 30, 1997, the committee addressed the comments and approved the standard for submittal to ANSI for endorsement as an American National Standard. . 111 STD*AGA BL09-4-ENGL 1998 9008836 0000682 590 ACKNOWLEDGEMENTS The task group members

24、 of the Operating Section of A.G.A. who contributed to the development of this standard and deserve special thanks are: Task Group Chairman Winston C. Meyer, ENTEX, Houston, TX Administrative Secretary Lany T. Ingels, American Gas Association, Arlington, VA MEMBERS FROM AMERICAN GAS ASSOCIATION DIST

25、RIBUTION MEASUREMENT COMMITTEE John F. Hunt, New York State Electric and to resist permanent deformation when pressed against the valve orifice. The valve disk shall be securely fastened to its actuator so that it cannot become separated during shipping, handling or operation. It shall be removable

26、for inspection and replacement. For internal relief regulators, a travel stop shall be incorporated to ensure relief-valve operation. 4.6 Orifice 4.6.1 The valve orifice shall be constructed of materials that meet the tests described in this standard. 4.6.2 The valve onfice shall be removable. The v

27、alve orifice threads, if used, shall be gas-tight. If a thread sealant is used, it shall be of a permanent non-drying type. Sealants shall withstand 250 F (121“ C) without affecting the gas tightness of the thread. 4.6.3 The orifice seat gasket, if used, shall be made of a pressure-containing, non-

28、galling, corrosion-resistant material. 4.7 Exterior Surface The external components of the regulator shall either be made of or protected by materials resistant to attack by the atmosphere, weather or sunlight, and to agents used in regulator repair and cleaning. Exteriors shall be capable of meetin

29、g or exceeding the following tests. 4.7.1 Accelerated weathexing test: Samples of the regulator case or other specific external parts of the regulator that are to be tested shall be prepared and protected using exactly the same methods and materials employed in manufacturing the regulators. Samples

30、shall be exposed to the following weathering tests, with reference to ASTM D822, for 14 days. The exposure cycle shall consist of the periods of ultraviolet light radiation and fresh water 7 spray shown in Table III. There shall be no appreciable progressive corrosion, electrolytic action, appreciab

31、le discoloration or harmful reaction as a result of this 14-day test. Portion of Exposure Cycle Direct ultraviolet radiation TABLE JII Time Period Light Only: I 102 minutes Fresh water spray Light and spray: 18 minutes Total Length of Each Exposure Cycle 120 minutes 4.7.2 Salt spray test: Samples, a

32、s in Section 4.7.1, shall be mounted in the salt- spray chamber in their normal operatmg position. They shall be subjected to a 24-hour salt-spray test in accordance with ASTM Method B-117-73, “Salt Spray (Fog) Testing.“ As a result of this test, there shall be no appreciable signs of blistering, co

33、rrosion or deterioration of the surface. The samples shall then be placed, without cleaning or washing, in a dry indoor location for a period of six months. At the end of that time, there shall be no appreciable signs of progressive corrosion or electrolyhc action. 4.8 Vent 4.8.1 The atmospheric sid

34、e of the diaphragm case shall have a female threaded 34-inch (19 mm) or 1-inch (25.4 mm) vent connection and shall conform to the NPT standards of ANSUASME BI-20-1. The threads shall be countersunk or chamfered as set forth in ANSI B 16.3 to prevent damage to the threads when making a threaded conne

35、ction. 4.8.2 The vent connection shall have a removable non-corrosive vent screen or the equivalent. The vent opening shall be designed to resist blockage by ice, sleet, snow and insects, and be resistant to the formation of corrosion residue on the surfaces of screen ports. NOTE: Historically, if a

36、 screen is used, a 16- to 20-mesh screen has been shown to be effective. The vent opening shall be designed to meet the environmental test requirements as detailed in Section 5.3.12, “Environmental Tests.“ 8 4.9 Markings 4.9.1 The following information shall appear in a permanent and legible form on

37、 the regulator. a) orifice size b) pressure adjusting spring range c) month and year of manufacture d) manufacturers name or trademark e) regulator type or model 4.9.2 The above marhngs are the minimum requirements of this standard. Additional optional information may appear on the regulator accordi

38、ng to the purchasers specific requirements, such as: a) IRV designation, if appropriate b) maximum recommended inlet pressure for the orifice c) the regulator set point 4.9.3 Direction of the gas flow shall be clearly and permanently marked on the regulator body as prescribed in MSS Standard Practic

39、e SP-25. 4.9.4 The vent outlet shall be clearly and permanently marked “VENT.“ 5.0 Qualification Test for Service Regulator Performance 5.1 General The purpose of the testing is to evaluate the regulator design for compliance with this standard. Designs shall be subjected to testing for regulator ca

40、pacity, relief-valve capacity, set point, lock-up performance, material strength and other factors influencing the performance to the regulator. 5.1.1 A careful inspection of the regulator shall be made prior to testing to ensure that there is no foreign material present in the regulator. 5.1.2 The

41、regulator shall be tested in the following orientation (See Figure 1, page 18). a) The regulator shall be installed in a vertical run of pipe. b) The diaphragm shall be in a vertical position. c) The vent shall be pointed downwards with unrestricted air flow. 5.1.3 The regulator shall have an orific

42、e selected for the appropriate operating conditions. 5.1.4 All tests shall be conducted with air at room temperature, unless specified otherwise . 9 5.1.5 All tests shall be conducted under hown and controlled conditions, wherein the accuracy of the containers, tapes, scales and other “state-of-the-

43、art” measurement devices are traceable to the National Institute of Standards and Technology (NiST). 5.2 Test Equipment 5.2.1 Pressure Measurement Pressure gauges: Bourdon tube pressure gauges should have a dial face not less than 4 inches (10.2 cm) in diameter. The smallest graduation and accuracy

44、of the middle half of the scale should be in accordance with ANSI B40.1 Grade B, “Dial Type, Elastic Element Gauges. The gauge should be selected to provide readings in the middle half of its scale. Calibration of the gauge should be in accordance with ASME Power Test Code (PTC) 19.2. Manometers: A

45、manometer should have scale graduations not greater than O. 1 inch (2.5 mm). Digital pressure transducers: A pressure transducer should have accuracy of better than f0.25% of full scale, taking into account linearity, repeatability and hysteresis. A digital display used in conjunction with the trans

46、ducer should be updated a minimum of twice per second. It should have traceable calibration or be calibrated in accordance with ASME PTC 19.2. 5.2.2 Pressure Sensing All pressure-sensing positions and connections should be as shown in Fig. 1. Piezometer tubes: Body-sized piezometer tubes should be u

47、sed to sense the inlet and the outlet pressures immediately upstream and downstream of the unit. Tubes larger or smaller than the pipe size of the regulator body should not be used. Their dimensions should correspond to the following ratios. Tube inlet: 5 pipe I.D. upstream of ring holes Tube outlet

48、: 5 pipe I.D. downstream of ring holes Ring holes: Up through 1-inch NPT pipe: Six l/l-inch holes equally spaced around the pipe, Greater than 1-inch NPT: Eight 3/32-inch holes equally spaced around the pipe Gauge connection: 1/4-inch NPT registering through an 1/8-inch hole into the piezometer ring

49、 10 5.2.3 Flow Measurement Flow meters: Orifice meters, rotary meters or equivalents may be used to measure the flow of the regulator. The flow result given by the meter should be accurate to within I 1 .O% of flow rate. 5.3 Test Procedures The following design-qualification test procedures shall be performed for each regulator configuration and orifice size specified by the manufacturer. For consistent proof of regulator performance, each regulator of the manufacturers sample lot (a minimum of two regulators) shall be subjected to each test procedure exce