编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第1页 共1页The Chinese version of standards has precedence to their English translations which are only for internal reference.本英文版为内部资料，仅供参考，以中文版为准。UDC SHTrade Standards of the Peoples Republic of China中华人民共和国行业标准P SH 3063-1999 Specifications for Design of Combustible Gas and Toxic Gas Detection and Alarm Systems in Petrochemical Industry石油化工企业可燃气体和有毒气体检测报警设计规范Issued on 15 Apr. 1999 Executed since 1 Sept. 19991999-04-15发布 1999-09-01实施 ISSUED BY THE STATE PETROLEUM AND CHEMICAL INDUSTRY BUREAU国家石油和化学工业局 发布PREFACEThe Specifications are revised by this corporation based on the original specifications “Specifications for Design of Combustible Gas Detection and Alarm Systems in Petrochemical Industry” SH3063-94 according to the notification of the file (1996) JBZ No.250 issued by SINOPEC.The specifications consist of six chapters and two appendices. The major purpose of this revision is to add the contents on the design of toxic gas detection and alarm.In the revision course, the problem that the original specifications contains no content on the design of toxic gas detection and alarm has been given broadly invested and studied; practical experiences in toxic gas detection and alarm in petrochemical enterprises in the last years have been summarized; suggestions and opinions from relevant design, production, research and development, and detecting instrument aspects have been collected; and some key issues are discussed many times; finally, this final version of the Specifications is confirmed. If any part in the Specifications is found to revise or supplement in its implement, please offer your suggestion or data to this corporation for reference in future further revision, The contact address of this corporation: No. 27 Zhongzhou W. Rd., Luoyang, Henan, 471003.The Specifications is compiled mainly by Luoyang Petrochemical Engineering Corporation, SINOPEC.Units participated the complement of the Specifications include Lanzhou Design Institute, SINOPEC, The Instrument Plane of Yanshan Petrochemical Corporation, SINOPEC,Shenzhen Anhui Industrial Co.Main drafters of the Specifications are Wang Huaiyi, Wang Yubin，Wang ZipinCONTENTS1. GENERAL PRINCIPLES32. TERMINOLOGY AND SYMBOLS32.1 Terminology 32.2 Symbols33. COMMON STIPULATIONS44. DETERMINATION OF DETECTION POINTS54.1 Processing installations54.2 Storage-transportation Facilities64.3 Locations where Combustible Gases and Toxic gases Diffuse and Accumulate 75. DETECTION-ALARM SYSTEMS OF COMBUSTIBLE GASES AND TOXIC GASES85.1 System composition and performance85.2 Selection of the detectors95.3 Selection of Alarms or Indicator-alarms106. INSTALLATION OF ALARMS FOR COMBUSTIBLE GASES AND TOXIC GASES 126.1 Installation of the detector126.2 Installation of alarms or indicator-alarms12APPENDIX A: PROPERTIES TABLE OF COMBUSTIBLE GASES, TOXIC GASES, AND THEIR VAPORS13ATTACHMENT:ELUCIDATION OF SOME TERMS USED IN THE SPECIFICATIONS191. GENERAL PRINCIPLES1.0.1 The Specifications are formulated in order to ensure the safety production and /or personal safety in petrochemical enterprises by detecting the concentration of possibly leaked combustible gases and toxic gases and timely making alarm to prevent fire and/or explosion hazard.1.0.2 The Specifications are applicable for the design of the detection and the alarm ofcombustible gases and toxic gases for petrochemical enterprises.1.0.3 The current relevant mandatory standards and specifications should be met in addition to the Specifications.2. TERMINOLOGY AND SYMBOLS2.1 Terminology2.1.1 Combustible gasThe combustible gas for the purpose of the Specifications means the gases in Class A which lower explosive limits are below 10(v/v) % or the difference between both the upper and lower limits are more than 20(v/v) %, or the combustible gases or those containing small amount of toxic gases which are formed from liquefied hydrocarbons, combustible liquids in Classes Ab, and Ba by vaporization.2.1.2 Toxic gasThe toxic gas for the purpose of the Specifications means hydrogen sulfide, hydrogen cyanide, chlorine, carbon monoxide, acrylonitrile, epoxyethane, and chlorethylene. 2.1.3 Allowable maximum concentrationIt means the allowable maximum concentration of a or some hazardou