1、Designation:E100803(Reapproved 2009)Standard 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 E1008;the number immediately following the designati
2、on indicates 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()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers installation,inspecti
3、on,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 practices
5、and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 API Standard:26DSpecifications for Pipe Line Valves,End Closures,Connectors and Swivels3.Terminology3.1 Definitions:3.1.1 relief devicea spring loaded valve or rupture diskthat will relieve excessive pr
6、essure from the body cavity at apredetermined pressure.4.Installation4.1 Any valve conforming to the description in Section 1 ofthis practice shall have a body cavity pressure relief deviceinstalled in a manner to relieve excessive pressure from thebody cavity.The relief pressure setting shall not e
7、xceed 700kPa(101.5 psi)above the rated working pressure of the valveassembly at 40C(104F)as defined in the latest edition ofAPI6D.4.2 The installation shall be such that direct access to thebody cavity is maintained and that the pressure relief devicemay be periodically removed,cleaned,inspected,and
8、 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 assembly is shown in Fig.1.The sh
9、utoff 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(forexample,for temperatures below freezing)valves of the ty
10、pedescribed in Section 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 freezing point(below 45C(49F).6.Inspe
11、ction6.1 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 recommendedinspection period shall not exceed one year.6.3 If
12、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 opening to the valve body cavity shall be inspectedfor blo
13、ckage,and any blockage of scale or any other foreignmaterial.1This practice is under the jurisdiction of ASTM Committe E44 on Solar,Geothermal and OtherAlternative Energy Sources and is the direct responsibility ofSubcommittee E44.15 on Geothermal Field Development,Utilization and Materials.Current
14、edition approved April 1,2009.Published June 2009.Originallyapproved in 1984.Last previous edition approved in 2003 as E100803.DOI:10.1520/E1008-03R09.2Available from American Petroleum Institute(API),1220 L.St.,NW,Washington,DC 20005-4070,http:/www.api.org.Copyright ASTM International,100 Barr Harb
15、or Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.5 The pressure relief device shall be reinstalled in accor-dance with this practice.7.Keywords7.1 geothermal valve;pressure-relief deviceASTM International takes no position respecting the validity of any patent rights asserted in
16、 connection with 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 technical 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 stand
