No yes have all parts been examined no yes stop iec

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Unformatted text preview: iation credible? No No Investigate causes, consequences and protection or indication, and document Have all interpretations of the guide word and element/characteristics combinations been applied? Yes No Has the selected guide word been applied to all elements? Yes Have all guide words been applied? No Yes Have all parts been examined? No Yes Stop IEC 452/01 Figure 2b – Flow chart of the HAZOP examination procedure – Guide word first sequence 22 22 © BSI 28 1002−80ISB © 1002−80 ISB August 2001 BS IEC 61882:2001 6 1882 Ó I EC:2001 6.6 Documentation 6.6.1 Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad 4397000, 01 October 2003, Uncontrolled Copy, (c) BSI – 24 – General The primary strength of HAZOP is that it presents a systematic, disciplined and documented approach. To achieve full benefits from a HAZOP study, it has to be properly documented and followed up. The study leader is responsible to ensure that suitable records are produced for each meeting. The recorder should have good technical knowledge of the subject being studied, linguistic skills and good ability to listen and pay attention to details. Various methods of reporting are discussed in annex A. 6.6.2 Styles of recording There are two basic styles of HAZOP recording: full, and by exception only. The method of recording should be decided before any sessions take place, and the recorder advised accordingly. · F ull recording involves recording of all results of applying each guide word – element/characteristic combination to every part or element on the design representation. This method, though cumbersome, provides the evidence that the study has been thorough and should satisfy the most stringent audit requirements. · B y exception recording involves recording only the identified hazards and operability problems together with the follow-up actions. Recording by exception results in more easily managed documentation. However, it does not document the thoroughness of the study and is therefore less useful for audit purposes. It can also lead to covering the same ground again at some future study. By exception recording is therefore a minimum requirement and should be used with care. In deciding the form of reporting to be employed, the following factors should be considered: · r egulatory requirements; · c ontractual obligations; · c ompany corporate policy; · n eeds for traceability and auditability; · t he magnitude of the risks posed by the system concerned; · t he time and resources available. 6.6.3 Output of the study The output from a HAZOP study should include the following: · d etails of identified hazards and operability problems together with details of any provisions for their detection, and/or mitigation; · r ecommendations for any further studies of specific aspects of the design using different techniques, if necessary; · a ctions required for addressing uncertainties discovered during the study; · r ecommendations for mitigation of the problems identified based on the team’s knowledge of the system (if within the scope of the study); · n otes which draw attention to particular points which need to be addressed in the operating and maintenance procedures; · a l ist of team members for each session; © BSI ISB © 1002−80 August 1002−8028ISB © 2001 23 32 32 BS IEC 61882:2001 6 1882 Ó I EC:2001 – 25 – · a l ist of all the parts considered in the analysis together with the rationale where any have been excluded; · l isting of all drawings, specifications, data sheets, reports, etc quoting revision numbers used by the team. Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad 4397000, 01 October 2003, Uncontrolled Copy, (c) BSI With “by exception” recording, these outputs will normally be contained fairly concisely within the HAZOP worksheets. With full recording, the required outputs may need to be “distilled out” from the overall study worksheets. 6.6.4 Reporting requirements The recorded information should conform to the following: · e very hazard and operating problem should be recorded as a separate item; · a ll hazards and operating problems together with their causes should be recorded regardless of any protection or alarm mechanism already existing in the system; · e very question raised by the team for study after the meeting, should be recorded, together with name of a person who is responsible to answer it; · a n umbering system should be adopted to ensure that every hazard, operational problem, question, recommendation, etc. is uniquely identifiable; · t he study documentation should be archived for retrieval, as and when required, and referenced in the hazard log for the system (if such exists). Precisely who should receive a copy of the final report will be largely dictated by internal company policy or by regulatory requirements but should normally include the project manager, the study leader and the person assigned responsibility for ensuring that follow-up...
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This note was uploaded on 09/15/2011 for the course ECON 102 taught by Professor Calvin during the Winter '11 term at Oxford Brookes.

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