1、Designation: E 1008 03Standard Practice forInstallation, Inspection, and Maintenance of Valve-bodyPressure-relief Methods for Geothermal and Other High-Temperature Liquid Applications1This standard is issued under the fixed designation E 1008; the number immediately following the designation indicat
2、es the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers installation, inspectio
3、n, and main-tenance of valve body cavity pressure relief methods for valvesused in geothermal and other high-temperature liquid service.The valve type covered by this practice is a design with anisolated body cavity such that when the valve is in either theopen or closed position pressure is trapped
4、 in the isolatedcavity, and there is no provision to relieve the excess pressureinternally.1.2 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practi
5、ces and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 API Standard:6DSpecifications for Pipe Line Valves, End Closures,Connectors and Swivels22.2Proposed specification ISO/DIS 143133. Definitions3.1 relief devicea spring loaded valve or rupture disk t
6、hatwill relieve excessive pressure from the body cavity at apredetermined pressure.4. Installation4.1 Any valve conforming to the description in 1 of thispractice shall have a body cavity pressure relief deviceinstalled in a manner to relieve excessive pressure from thebody cavity. The relief pressu
7、re setting shall not exceed 700kPa (101.5 psi) above the rated working pressure of the valveassembly at 40 C (104 F) as defined in the latest edition ofAPI 6D.4.2 The installation shall be such that direct access to thebody cavity is maintained and that the pressure relief devicemay be periodically
8、removed, cleaned, inspected, and rein-stalled without endangering the operating personnel or remov-ing the valve from its functional application.4.2.1 The relief device may be mounted with an automaticshutoff, such as a check valve held in the open position by therelief device. An example of such an
9、 assembly is shown in Fig.1. The shutoff device will not be rendered inoperative.5. Cold-Weather Considerations5.1 Temperatures below freezing are considered due to iceformation within the body cavity and the associated expansion.5.2 The recommended procedures for winterizing (for ex-ample, for temp
10、eratures below freezing) valves of the typedescribed in 1 of this recommended practice shall be asfollows:5.2.1 The valve must be fully closed or fully opened.5.2.2 The body cavity should be purged with a nonreactivegas (for example, nitrogen) or filled with a fluid to produce asolution with a low f
11、reezing point (below 45 C (-49 F).6. Inspection6.1 The pressure relief device shall be kept clean to ensureproper operation.6.2 The relief device shall be removed, inspected, thencleaned, repaired, or replaced, and reinstalled on a scheduledetermined by the respective application. The recommendedins
12、pection period shall not exceed one year.6.3 If removal of the relief device shall seal the valve bodycavity, (for example, a spring loaded check valve as shown inFig. 1) and the working temperature of the valve may change,then a substitute relief device shall be installed immediately.6.4 The openin
13、g to the valve body cavity shall be inspectedfor blockage, and any blockage of scale or any other foreignmaterial.6.5 The pressure relief device shall be reinstalled in accor-dance with this practice.7. Keywords7.1 geothermal valve; pressure-relief device1This practice is under the jurisdiction of A
14、STM Committe E44 on Solar,Geothermal, and Other Alternative Energy Sources and is the direct responsibility ofSubcommittee E44.15 on Field Development.Current edition approved Oct. 1, 2003. Published October 2003. Originallyapproved in 1984. Last previous edition approved in 1997 as E 1008972Availab
15、le from American Petroleum Institute, 2101 L St., N.W., Washington,DC 20037.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ASTM International takes no position respecting the validity of any patent rights asserted in connection with
16、 any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible techni
17、cal committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideratio
18、n at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harb
19、or Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).FIG. 1 Assembled Valve-body Pressure-relief DeviceE1008032
