HGT205052000过程测量与控制仪表的功能标志及图形符号.doc

HGUDCTRADE STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA中华人民共和国行业标准P HG/T20505-2000 Functional Identification and Symbols for Process Measuring and Controlling Instrumentation过程测量与控制仪表的功能标志及图形符号Issued on: November 22, 2000 Implemented on: June 1, 2001Issued by: National Industry Office of Petroleum and ChemistryTRADE STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA中华人民共和国行业标准Functional Identification and Symbols for Process Measuring and Controlling Instrumentation过程测量与控制仪表的功能标志及图形符号HG/T20505-2000Compiled by: Chengda Chemical Engineering Company of ChinaApproved by: National Industry Office of Petroleum and ChemistryImplemented on: June 1, 2001National Standard Compilation Center for Engineering Establishment of Chemical Industry(Originally called National Standard Compilation Center for Engineering Establishment of Chemical Industry Department)2001 Bei jingNOTICEThis code is written in Chinese and English. The Chinese text shall be taken as the ruling one in the event of any inconsistency between the Chinese text and the English text.Contents1 General 12 Functional Identification of Instrumentation 22.1 Functional Identification Composition 22.2 Instrument Tag Number 23 Letter Code and Commonly Used Abbreviate of Functional Identification for Instrument 53.1 Letter Code of Functional identification 53.2 Symbols for Additional Functions to Letter Y 103.3 Commonly Used Abbreviate Letter for Instrumentation 124 Graphical Symbols for Instrumentation 154.1 Graphical Symbol Used for Instrumentation Monitoring 154.2 Graphical Symbol for Detecting Point and Connecting Line 174.3 Graphical Symbol for Flow Detecting Instrument 194.4 Graphical Symbol for Actuating Device 214.5 Graphical Symbol for Self-operated Control Valve 244.6 Graphical Symbol for Auxiliary Facility to Instrumentation 245 Illustrations on Graphical Symbol Application 265.1 Graphical Symbol Illustration on Detecting System 265.2 Graphical Symbol Illustration on Auto-control System and Program Control System 345.3 Graphical Symbol Illustration on Safety Interlock System 395.4 Graphical Symbol Illustration for Typical Control System 41Explanation on specific word of this code 43Clause Explanation 44451 General 1.0.1 This code is applicable for the design of instrument tag number determination, P & ID (Pipe and Instrument Flow Diagram) and monitor system schematic diagram, etc. that happened in initial design/ basic design, engineering design/constructional drawing design of auto control system in chemical industry. This code, together with “Graphical Symbol and Letter Code Used for Engineering Design of Auto Control Industry” (HG/T20637.2), forms regular technical standards for auto control design of chemical industry concerning graphical symbol. 1.0.2 Relevant standards indicated below: ISA-S5.1 “Symbol and Identification for Instrumentation”HG/T20637.2 “Graphical Symbol and Letter Code Used for Engineering Design of Auto Control Industry”Upon implementation of this code, requirements from relevant standards existed nationally are to be conformed. 2 Functional Identification of Instrumentation2.1 Functional Identification Composition2.1.1 Functional identification for instrumentation is composed of one capital letter and one or two to three sequent letters. Examples indicated below:Example 1: PI – Functional identification P – Capital letter (indicating measured variable) I – Sequent letter (indicating readout function)Example 2: TIC – Functional identification T – Capital letter (indicating measured variable) IC – Sequent letter (indicating readout function + output function)Example 3: HIC – Functional identification H – Capital letter (indicating initiating variable) IC – Sequent letter (indicating readout function +output function)Example 4: FFICA – Functional identification FF – Capital letter (indicating measured variable +modifier letter) ICA – Sequent letter (indicating readout function + output function +readout function)Example 5: PDAHL – Functional identificationPD – Capital letter (indicating measured variable of attached modifier letter)AHL – Sequent letter (indicating readout function + modifier letter)2.1.2 Application of capital letter and sequent letter used for functional identification for instrumentation is to conform to requirements from 3.1.1. 2.1.3 Functional identification shows instrument function only instead of its structure. Differential press。