UDC SH
Trade Standards of the People's 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. 1999
1999-04-15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

PREFACE

The 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 Zipin













CONTENTS

1. GENERAL PRINCIPLES……………………………………………………………3

2. TERMINOLOGY AND SYMBOLS…………………………………………………3
2.1 Terminology …………………………………………………………………………3
2.2 Symbols………………………………………………………………………………3

3. COMMON STIPULATIONS………………………………………………………4

4. DETERMINATION OF DETECTION POINTS…………………………………5
4.1 Processing installations………………………………………………………………5
4.2 Storage-transportation Facilities……………………………………………………6
4.3 Locations where Combustible Gases and Toxic gases Diffuse and Accumulate ………7

5. DETECTION-ALARM SYSTEMS OF COMBUSTIBLE GASES
AND TOXIC GASES……………………………………………………………………8
5.1 System composition and performance………………………………………………8
5.2 Selection of the detectors……………………………………………………………9
5.3 Selection of Alarms or Indicator-alarms……………………………………………10

6. INSTALLATION OF ALARMS FOR COMBUSTIBLE GASES
AND TOXIC GASES………………………………………………………………… 12
6.1 Installation of the detector……………………………………………………………12
6.2 Installation of alarms or indicator-alarms……………………………………………12

APPENDIX A: PROPERTIES TABLE OF COMBUSTIBLE GASES, TOXIC GASES, AND THEIR VAPORS………………………………………………………………………13

ATTACHMENT:

ELUCIDATION OF SOME TERMS USED IN THE SPECIFICATIONS…………………19



1. GENERAL PRINCIPLES

1.0.1 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