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IEC TR 63176
Edition 1.0 2019-01
TECHNICAL
REPORT
Process analysis technology systems as part of safety instrumented systems
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IEC TR 63176
Edition 1.0 2019-01
TECHNICAL
REPORT
Process analysis technology systems as part of safety instrumented systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.110; 25.040.40 ISBN 978-2-8322-6407-2
– 2 – IEC TR 63176:2019 © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms . 9
4 Qualification process . 10
4.1 Overview. 10
4.2 Recommendation for constructor requirements . 12
4.3 Recommendation for plant operator requirements . 13
4.4 Basic testing (analyser only) . 14
4.5 Engineering . 14
4.5.1 General . 14
4.5.2 Design data . 15
4.5.3 Analyser including application . 15
4.5.4 Sample conditioning . 15
4.5.5 HFT . 15
4.5.6 Failure Mode Effects and Diagnosis Analysis of the PAT system
(FMEDA) . 16
4.5.7 Estimation of the PFD value . 16
PAT
4.5.8 Proven performance – from case to case following prior in-service
testing of the PAT system . 17
4.5.9 Safety logic in the PAT system . 17
4.5.10 Sample switching . 18
4.5.11 Compilation of a plan for periodic inspections during the runtime . 18
4.6 Commissioning of the safety system . 18
4.7 Documentation of the qualification process . 18
5 Regular operation . 19
5.1 General . 19
5.2 Periodic testing during runtime . 19
5.3 Documents and records in operation . 19
5.3.1 General . 19
5.3.2 Maintenance schedule . 19
5.3.3 Working instructions . 19
5.3.4 Record of work realised . 19
5.3.5 Fault data recording . 20
5.4 Evaluation of fault data and handling of deviations . 20
5.5 Modifications. 20
5.5.1 Modifications to the PAT system . 20
5.5.2 Modifications of the process engineering process . 20
5.6 Decommissioning and recommissioning . 21
5.6.1 Decommissioning . 21
5.6.2 Recommissioning . 21
5.7 Grandfathering . 21
Annex A (informative) Basic testing of analysers . 22
Annex B (informative) FMEDA – documentation of safety assessment (example) . 25
Annex C (informative) PFD – numerical time-discrete determination . 26
Bibliography . 29
Figure 1 – Qualification process levels for a PAT measuring system . 12
Figure A.1 – Basic testing process for analysers in SIS . 24
Figure B.1 – FMEDA – documentation of safety assessment (example) . 25
Table 1 – Minimum HFT requirements according to SIL . 16
– 4 – IEC TR 63176:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PROCESS ANALYSIS TECHNOLOGY SYSTEMS AS PART OF SAFETY
INSTRUMENTED SYSTEMS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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The main task of IEC technical committees is to prepare International Standards. However, a
technical committee may propose the publication of a technical report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC TR 63176, which is a Technical Report, has been prepared by subcommittee 65B:
Measurement and control devices, of IEC technical committee 65: Industrial-process
measurement, control and automation.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
65B/1111/DTR 65B/1131/RVDTR
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 document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
– 6 – IEC TR 63176:2019 © IEC 2019
INTRODUCTION
This Technical Report is designed as a recommendation to aid users of process analyzer
technology that measures installations as part of safety instrumented systems and should be
treated exclusively as a recommendation. Formulations of a binding character encountered in
the recommendation are due to the safety-related content. However, the advisory character of
this document is maintained as a whole. Process analyzer technology measuring equipment is
u
...