1、 IEC/TR 61831 Edition 2.0 2011-08 TECHNICAL REPORT On-line analyser systems Guide to design and installation IEC/TR 61831:2011(E) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2011 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reprod
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10、ide to design and installation INTERNATIONAL ELECTROTECHNICAL COMMISSION XB ICS 13.040; 13.060; 17.020 PRICE CODE ISBN 978-2-88912-633-0 Registered trademark of the International Electrotechnical Commission 2 TR 61831 IEC:2011(E) CONTENTS FOREWORD . 5 INTRODUCTION . 7 1 Scope . 8 2 Normative referen
11、ces . 8 3 Terms and definitions . 8 4 Remarks and considerations. 9 4.1 General remarks 9 4.2 Further considerations . 9 4.3 Reliability 10 4.4 Design . 10 4.5 Centralisation 10 4.6 Local mounting 10 4.7 Pre-assembled systems 10 5 Health, safety and environmental considerations 11 5.1 Overview . 11
12、5.2 Prevention of explosions and fires . 11 5.3 Prevention of toxic and asphyxiant hazards . 11 5.4 Radiation hazards . 12 5.5 Safety facilities 12 5.6 Manual shut-down facilities . 12 5.7 Noise 12 6 Housings 12 6.1 Overview . 12 6.2 Selection of housing 13 6.2.1 Analyser case 13 6.2.2 Analyser cabi
13、net 13 6.2.3 Analyser shelter 13 6.2.4 Analyser house 14 6.3 Area classification and toxic danger 14 6.3.1 Electrical area classification 14 6.3.2 Toxic and asphyxiate danger . 14 6.4 Construction and mounting 14 6.4.1 General . 14 6.4.2 Analyser housings . 15 6.4.3 Analyser houses 15 6.4.4 Analyser
14、 shelters . 15 6.5 Analyser housings with natural ventilation . 16 6.5.1 General . 16 6.5.2 Ventilation requirements 16 6.5.3 Heating requirements 16 6.5.4 Analyser shelters . 17 6.5.5 Analyser cases 17 6.6 Analyser housings with forced ventilation 17 6.6.1 General . 17 6.6.2 Ventilation requirement
15、s 17 6.6.3 Air intake system . 17 TR 61831 IEC:2011(E) 3 6.6.4 Ventilation fan requirements 17 6.6.5 Airflow requirements 18 6.6.6 Heating requirements 18 6.6.7 Safety monitors and alarms . 18 7 Sampling systems 21 7.1 Overview . 21 7.2 Sample system terminology . 22 7.3 General requirements 22 7.4
16、Sample point location 23 7.5 Fast circulating systems (fast loops) 24 7.6 By-pass systems . 24 7.7 Sample recovery systems 24 7.8 Special considerations 25 7.9 Multi-stream systems 25 7.10 Construction 26 7.10.1 General . 26 7.10.2 Material selection 26 7.10.3 Flushing facilities . 27 7.10.4 Blockag
17、e removal 27 7.10.5 Heat tracing and insulation 27 7.10.6 Minimising risks from leakage 28 7.10.7 Location of equipment . 28 7.10.8 Instrumentation 28 7.10.9 Identification 28 7.11 Effluent disposal 29 7.11.1 General . 29 7.11.2 Vapour 29 7.11.3 Liquid 29 7.12 Calibration facilities . 30 7.13 Automa
18、tic calibration . 30 8 Analyser communications . 31 8.1 Overview . 31 8.2 Signal transmission . 31 8.3 Safety . 32 8.4 Cables . 33 8.5 Use of signal . 33 8.6 Alarms . 33 Annex A (informative) Typical analyser process line sampling probe for line sizes NPS 2“ and above 34 Annex B (informative) Determ
19、ination of sample probe lengths . 35 Annex C (informative) Sample system calculations 43 Annex D (informative) Natural ventilation calculations 56 Annex E (informative) Forced ventilation calculations 62 Annex F (informative) Example of verification/calibration sequence of data to computer 63 Annex
20、G (informative) Analyser house with forced ventilation Summary of recommended control shut-down actions for flammable hazard operation . 64 4 TR 61831 IEC:2011(E) Annex H (informative) Analyser houses with forced ventilation Ventilation failure and flammable gas detection trip logic . 65 Annex I (in
21、formative) Typical analyser system schematics . 67 Annex J (informative) Example schematic showing a typical wall penetration using a transit . 69 Bibliography 70 Figure A.1 Typical analyser sample probe design 34 Figure C.1 Sample system configuration 49 Figure D.1 Schematic showing wind induced fr
22、ee ventilation principles with worked example ventilation louvre layout and suggested warm air distribution 56 Figure F.1 Typical signal sequence during verification . 63 Figure H.1 Typical analyser shelter logic diagram 66 Figure I.1 Multi-stream sampling for processes of similar pressure and compo
23、nents (e.g. atmospheric sampling) 67 Figure I.2 Multi-stream sampling for processes of differing pressure and/or components showing typical double block and bleed arrangement 67 Figure I.3 Minimum pollution sampling configuration 68 Figure I.4 Typical double block and bleed arrangement 68 Figure J.1
24、 Typical wall penetration using a transit 69 Table B.1 Vibrational Mode Constants . 36 Table B.2 Example calculations for maximum fluid velocity 40 Table C.1 Nomenclature Used In Calculations . 43 Table C.2 Equivalent lengths of valves and fittings 46 Table C.3 Sample system component pressure drop
25、allowances 48 Table G.1 Shelter safety cause and effect matrix . 64 TR 61831 IEC:2011(E) 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ON-LINE ANALYSER SYSTEMS GUIDE TO DESIGN AND INSTALLATION FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardiza
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37、ly published as an International Standard, for example “state of the art“. IEC 61831, which is a technical report, has been prepared by subcommittee 65B: Devices and integration in enterprise systems, of IEC technical committee 65: Industrial-process measurement, control and automation. With the kin
38、d permission of the Engineering Equipment and Materials Users Association this report is based on and includes extracts from EEMUA Publication 138. This second edition cancels and replaces the first edition published in 1999. This edition constitutes a technical revision. The main changes with respe
39、ct to the previous edition are listed below. Updated references; 6 TR 61831 IEC:2011(E) Made consistent with current practices and regulations; Incorporating new technologies where applicable. The text of this technical report is based on the following documents: Enquiry draft Report on voting 65B/7
40、44/DTR 65B/793/RVC Full information on the voting for the approval of this technical report can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publ
41、ication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. TR 61831 IEC:2011(E) 7 INTRODUC
42、TION This Technical Report provides guidance on the design and installation of on-line analyser systems. There are many International standards and documents which are referenced below relating to specific parts of the design and safety of on-line analyser systems. However, there is limited practica
43、l guidance available on the overall design concepts, approaches, tools and methodology for the design and installation of on-line analyser systems to ensure they perform with the required reliability and precision which this publication addresses. The document is divided into eight clauses 1. Genera
44、l 2. Normative references 3. Terms and definitions 4. Remarks and considerations 5. Health, safety and environmental considerations 6. Housings 7. Sampling systems 8. Analyser communications Individual users of on-line analysers have varying practices but the fundamental approach is generally simila
45、r. It is therefore hoped that this document will encourage standardisation within industry and lead to reduction in design and construction costs and to improved safety. The word “analyser“ has been used throughout this document to refer to instruments variously known as on-line analysers, process s
46、tream analysers, quality analysers, quality measuring instruments and process quality monitors. Where reference is made to International standards it should be noted that National authorities may have statutory requirements that are mandatory. 8 TR 61831 IEC:2011(E) ON-LINE ANALYSER SYSTEMS GUIDE TO
47、 DESIGN AND INSTALLATION 1 Scope This technical report is a guide applicable to on-line analyser systems. It provides the necessary guidance for the system supplier and user to specify or design a complete analyser system from sample point in the process to the final output for display or control pu
48、rposes. 2 Normative references IEC 61285:2004, Industrial-process control Safety of analyzer houses ISO/IEC 8802-3:2000, Information technology Telecommunications and information exchange between systems Local and metropolitan area networks Specific requirements Part 3: Carrier sense multiple access
49、 with collision detection (CSMA/CD) access method and physical layer specifications BS 5925:1991, Code of practice for ventilation principles and designing for natural ventilation API (ANSI/ASTM D4177), Manual of Petroleum Measurement Standards Part 8: Chapter 8.2 Automatic Sampling of Petroleum Products () EEMUA 175, Code of Practice for Calibration and Checking Process Analysers (Formerly IP 340) 3 Terms and definitions For the pur
