HAZOP_GUIDE_BRITISH_STANDARD_IEC_61882_2001

10 table

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Unformatted text preview: ....................................................10 Table 2 – Guide words relating to clock time and order or sequence .....................................11 Table 3 – Examples of deviations and their associated guide words ......................................19 Table B.1 – Example HAZOP worksheet for introductory example .........................................30 Table B.2 – Example HAZOP worksheet for procedures example ..........................................35 Table B.3 – Example HAZOP worksheet for automatic train protection system ......................39 Table B.4 – Example HAZOP worksheet for emergency planning ..........................................42 Table B.5 – Example HAZOP worksheet for piezo valve control system ................................49 Table B.6 – Example HAZOP worksheet for oil vaporizer ......................................................53 Figure 1 – The HAZOP study procedure ................................................................................. 9 Figure 2a – Flow chart of the HAZOP examination procedure – Element first sequence .......21 Figure 2b – Flow chart of the HAZOP examination procedure – Guide word first sequence ..............................................................................................................................22 Figure B.1 – Simple flow sheet ..............................................................................................29 Figure B.2 – Train-carried ATP equipment.............................................................................38 Figure B.3 – Piezo valve control system ................................................................................47 Figure B.4 – Oil vaporizer .....................................................................................................52 © BSI ISB © 1002−80 August 1002−8028ISB © 2001 3 BS IEC 61882:2001 6 1882 Ó I EC:2001 –5– INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________ Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad 4397000, 01 October 2003, Uncontrolled Copy, (c) BSI HAZARD AND OPERABILITY STUDIES (HAZOP STUDIES) – APPLICATION GUIDE FOREWORD 1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested National Committees. 3) The documents produced have the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guides and they are accepted by the National Committees in that sense. 4) In order to promote international unification, IEC National Committees undertake to apply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. 5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards. 6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61882 has been prepared by IEC technical committee 56: Dependability. The text of this standard is based on the following documents: FDIS Report on voting 56/731/FDIS 56/733/RVD Full information on the voting for the approval of this standard 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 3. Annexes A and B are for information only. The committee has decided that the contents of this publication will remain unchanged until 2005. At this date, the publication will be • • • • 4 4 reconfirmed; withdrawn; replaced by a revised edition, or amended. © BSI 28 1002−80ISB © 1002−80 ISB August 2001 BS IEC 61882:2001 6 1882 Ó I EC:2001 –6– INTRODUCTION The purpose of this standard is...
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