1、ASCE StAndArd AnSI/ASCE/SEI 2506American Society of Civil EngineersEarthquake-Actuated Automatic Gas Shutoff DevicesPublished by the American Society of Civil EngineersLibrary of Congress Cataloging-in-Publication Data Earthquake actuated automatic gas shutoff devices / American Society of Civil Eng
2、ineers.p. cm.“ANSI/ASCE/SEI 25-06.”Includes bibliographical references and index.ISBN 0-7844-0877-7 (alk. paper)1. Gas appliancesStandards. 2. EarthquakesSafety measures. I. American Society of Civil Engineers. TP758.E27 2006624.1762dc222006025039Published by American Society of Civil Engineers1801
3、Alexander Bell DriveReston, Virginia 20191www.pubs.asce.orgAny statements expressed in these materials are those of the indi-vidual authors and do not necessarily represent the views of ASCE, which takes no responsibility for any statement made herein. No reference made in this publication to any sp
4、ecific method, product, process, or service constitutes or implies an endorsement, recom-mendation, or warranty thereof by ASCE. The materials are for gen-eral information only and do not represent a standard of ASCE, nor are they intended as a reference in purchase specifications, contracts, regula
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8、more should be submitted to the Reprints Department, Publications Division, ASCE (address above); email: permissionsasce.org. A reprint order form can be found at http:/pubs.asce.org/support/reprints.Copyright 2008 by the American Society of Civil Engineers.All Rights Reserved.ISBN 13: 978-0-7844-08
9、77-3ISBN 10: 0-7844-0877-7Manufactured in the United States of America.iiiIn 2003, the Board of Direction approved the revision to the ASCE Rules for Standards Committees to govern the writing and maintenance of standards developed by the Society. All such standards are developed by a con-sensus sta
10、ndards process managed by the Societys Codes and Standards Committee (CSC). The consensus process includes balloting by a balanced standards committee made up of Society members and nonmembers, balloting by the membership of the Society as a whole, and balloting by the public. All standards are upda
11、ted or reaffirmed by the same process at intervals not exceeding five years.The following Standards have been issued:ANSI/ASCE 1-82 N-725 Guideline for Design and Analysis of Nuclear Safety Related Earth StructuresANSI/ASCE 2-06 Measurement of Oxygen Transfer in Clean WaterANSI/ASCE 3-91 Standard fo
12、r the Structural Design of Composite Slabs and ANSI/ASCE 9-91 Standard Practice for the Construction and Inspection of Composite SlabsASCE 4-98 Seismic Analysis of Safety-Related Nuclear StructuresBuilding Code Requirements for Masonry Structures (ACI 530-02/ASCE 5-02/TMS 402-02) and Specifications
13、for Masonry Structures (ACI 530.1-02/ASCE 6-02/TMS 602-02)ASCE/SEI 7-05 Minimum Design Loads for Buildings and Other StructuresSEI/ASCE 8-02 Standard Specification for the Design of Cold-Formed Stainless Steel Structural MembersANSI/ASCE 9-91 listed with ASCE 3-91ASCE 10-97 Design of Latticed Steel
14、Transmission StructuresSEI/ASCE 11-99 Guideline for Structural Condition Assessment of Existing BuildingsASCE/EWRI 12-05 Guideline for the Design of Urban Subsurface DrainageASCE/EWRI 13-05 Standard Guidelines for Installation of Urban Subsurface DrainageASCE/EWRI 14-05 Standard Guidelines for Opera
15、tion and Maintenance of Urban Subsurface DrainageASCE 15-98 Standard Practice for Direct Design of Buried Precast Concrete Pipe Using Standard Installations (SIDD)ASCE 16-95 Standard for Load Resistance Factor Design (LRFD) of Engineered Wood ConstructionASCE 17-96 Air-Supported StructuresASCE 18-96
16、 Standard Guidelines for In-Process Oxygen Transfer TestingASCE 19-96 Structural Applications of Steel Cables for BuildingsASCE 20-96 Standard Guidelines for the Design and Installation of Pile FoundationsANSI/ASCE/T if improperly installed, failure to function as intended or unwarranted interruptio
17、n of gas service could result.1.4.3 resetting WarningAll devices shall bear the following warning:Following actuation of this device, reset the device and restore service only after a qualified person has verified no gas leak exists.1.5 WarrantyManufacturers shall warrant the performance of devices
18、for a specified time to meet this standard.2.0 conStruction2.1 GeneralThe construction of parts not covered by this standard shall employ reasonable concepts of safety and durabil-ity. General assembly shall be of a neat and workman-like character with all parts and components well fitted.All specif
19、ications as to construction set forth herein may be satisfied by the construction actually prescribed or such other construction as will provide at least equivalent performance.2.1.1 indication of actuationThe device shall have an external means of indicat-ing whether or not actuation has occurred w
20、ithout the use of tools or equipment.2EArThquAkE-ACTuATED AuToMATIC GAS ShuToFF DEvICES2.1.2 resettingThe device shall require manual resetting after having been actuated.2.2 equipMent and data to be FurniShed by the ManuFacturerThe manufacturer shall furnish the following equip-ment and data for th
21、e use of the testing agency in list-ing devices under this standard.A. representative devices, as specified by the testing agencyB. Drawings, blueprints, or photographs that describe each model of the device as specified by the testing agencyC. Minimum and maximum operating pressureD. operating ambi
22、ent temperature rangeE. Drawings, blueprints, or photographs that describe the mounting configurations and leveling tolerancesF. operating instructions for the device that prescribe the steps necessary to reset the deviceG. A plot of pressure drop versus flow rateh. Capacity with 1,000 Btu/ft3 (37.2
23、5 MJ/m3), 0.64 specific gravity gas at 60 F and the following conditions:1. A pressure drop of 1.0 inch water column for a device with a maximum operating pressure of 0.5 psi (3.4 kPa)2. A pressure drop of 10% of the maximum operat-ing pressure for a device with a maximum oper-ating pressure of more
24、 than 0.5 psi (3.4 kPa)2.3 corroSion and cheMical reSiStance oF external partSvalve bodies, casings, and external parts shall be made of or protected by materials that are resistant to attack over the expected life of the device by the atmo-sphere, weather (sunlight, humidity, and temperature change
25、s), and common cleaning and other agents to which it may be exposed. The device case and exterior parts shall be capable of meeting or exceeding the requirements of ANSI B109 for gas meters.2.4 inStructionSComplete instructions covering installation and proper operation shall be furnished by the man
26、ufac-turer. These instructions shall be reviewed by the test-ing agency for accuracy and compatibility with results of tests.Included in these instructions shall be the following:A. A statement that the system must be installed by a qualified installer as defined by this standard or the authority ha
27、ving jurisdictionB. The necessity for compliance with local codes or, in the absence of local codes, with the National Fuel Gas Code, ANSI ASC Z223/NFPA 54, and, if appli-cable, the National Electrical Code, ANSI/NFPA 70C. Step-by-step installation and inspection proceduresD. Step-by-step procedures
28、 for resetting the device, including information that a qualified person, as defined by this standard, must follow to verify that no gas leak existsE. Instructions on how the device is to be located with respect to the related gas service and structuresF. Instructions on how the devices should be mo
29、unted to meet the requirements of Section 1.2.2G. Clearances not less than those needed for testing and resetting, and provisions for accessh. A description of how the system operatesI. Instructions for examining the system for continued safe operation indicating the necessity and mini-mum frequency
30、 for these examinationsJ. A plot of pressure drop versus flow ratek. The equivalent length of pipe, of the same nomi-nal size as the piping connection to the device, that would produce the same pressure drop indi-cated in the plot of pressure drop versus flow rate. Conditions used to determine the e
31、quivalent length of pipe must be specified2.5 continued operationThe continued operation requirements of ANSI Z21.21b/CSA 6.5b shall not apply to devices qualified under this standard.3.0 perForMance3.1 riGidity oF MountinGrigidity of mounting specified by a manufacturer shall be considered to meet
32、the minimum requirements of Section 1.2.2 if the mounting assembly, including the sensing means, has no resonant period greater than 0.06 seconds.3.2 deFlection liMitSone sample of the device shall be tested to confirm that after having closed, it will remain in the closed posi-tion with the device
33、in any position up to a maximum deflection of 45 degrees from vertical at any azimuth.3.3 teSt SpeciMenSTests other than those specified in Sections 3.4 and 3.5 shall be conducted on one sample of the device.3.4 ruGGedneSS oF deviceThree samples of the device shall be tested at room temperature to c
34、onfirm that after having closed, it will 3ANSI/ASCE/SEI 25-06not return to the open position after being subjected to horizontal sinusoidal oscillations.These tests shall be performed with the device in a closed position and oriented in a 20 degree deflected position from vertical as described in Se
35、ction 3.4.2 prior to the tests described in Section 3.4.1.Two samples shall be tested at no more than 0.5 psi (3.4 kPa) and one sample at the maximum specified operating pressure of the device.3.4.1 ruggedness test requirementsThe device, when in a closed position and a deflected position of 20 degr
36、ees from vertical, shall not be placed in an open position after being sub-jected to 20 seconds of horizontal sinusoidal oscilla-tion havingA. a peak acceleration of 0.85 g (8.33 m/s2) and a period of 0.13 second;B. a peak acceleration of 1.00 g (9.8 m/s2) and a period of 0.20 second;C. a peak accel
37、eration of 0.85 g (8.33 m/s2) and a period of 0.40 second; andD. a peak acceleration of 0.30 g (2.94 m/s2) and a period of 0.90 second.These conditions shall be met for horizontal axes of the sensing means.3.4.2 Method of testEach test shall be conducted on three samples of the device. With the agre
38、ement of the manufacturer, all three samples may be tested simultaneously.The device shall be rigidly attached to a table or plat-form capable of being adjusted to provide the horizontal or vertical, sinusoidal, unidirectional acceleration forces necessary to conduct the tests described herein.Test
39、motions shall be monitored by measuring the acceleration of the sensing means.Pipe-mounted devices shall be mounted on pipe and shall be mounted within 6 inches (15 cm) of either the surface of the table or a rigid object rigidly fastened to the table. rigidity of mounting may be demonstrated by res
40、onance search testing as described in ANSI/IEEE 344.The device shall be connected to a pneumatic system using inlet and outlet connectors that will not interfere with the motion of the platform. This pneu-matic system shall be capable of being monitored to determine whether the device under test has
41、 remained in a closed position. At the discretion of the testing agency, alternate means of determining the status of the device may be used, provided such means are objective and measurable.The device under test shall be positioned at 20 degrees from vertical relative to the specified position in t
42、he manufacturers installation instructions with the sensing means in the manufac-turers specified operating position. The device shall be rotated about its vertical axis to correspond to the least favorable orientation of the device, with respect to the direction of acceleration of the table. At the
43、 discretion of the testing agency, additional tests may be conducted at other orientations about the vertical axis.The table shall be adjusted to provide a horizontal oscillation at a period specified in Section 3.4.1. The acceleration levels shall be increased to the maximum acceleration level for
44、a selected oscillating period as specified in Section 3.4.1. The oscillations shall be maintained at this level for 20 seconds.If the shutoff means is open following this test, the device will be considered as not meeting the require-ments of this standard.3.5 reSponSe to SeiSMic diSturbanceSThe ran
45、ge of motions defining the response of devices is illustrated in Figure 3-1. Tests are required to confirm that devices meet the seismic response requirements of Figure 3-1.Three samples shall be tested for conformance to the seismic response performance requirements. All three samples must pass the
46、 seismic response require-ments of this section.Two samples shall be tested at no more than 0.5 psi (3.4 kPa). one sample shall be tested at the maximum specified operating pressure of the device.The three samples shall be tested at the minimum and maximum operating temperature defined in Section 1.
47、3.2.3.5.1 actuation requirementsThe sensing means of the device shall actuate the shutoff means within 5 seconds when subjected to horizontal sinusoidal oscillation havingA. a peak acceleration of 0.70 g (6.87 m/s2) and a period of 0.13 second;B. a peak acceleration of 0.40 g (3.92 m/s2) and a perio
48、d of 0.20 second;C. a peak acceleration of 0.30 g (2.94 m/s2) and a period of 0.40 second; andD. a peak acceleration of 0.25 g (2.45 m/s2) and a period of 1.00 second.These conditions shall be met for horizontal axes of the sensing means.3.5.2 non-actuation requirementsThe sensing means of a device
49、shall not actuate the shutoff means when subjected for 5 seconds to sinusoi-dal oscillations having4EArThquAkE-ACTuATED AuToMATIC GAS ShuToFF DEvICESA. a peak acceleration of 0.40 g (3.92 m/s2) with a period of 0.10 second;B. a peak acceleration of 0.20 g (1.96 m/s2) and a period of 0.20 second;C. a peak acceleration of 0.15 g (1.47 m/s2) with a period of 0.40 second; andD. a peak acceleration of 0.10 g (0.98 m/s2) with a period of 1.00 second.These conditions shall be met for both horizontal and vertical axes of the sensing means.3.5.3 Method of testEach test shall be conduct
