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Unformatted text preview: to describe the principles and procedures of Hazard and
Operability (HAZOP) Studies. HAZOP is a structured and systematic technique for examining
a defined system, with the objective of: Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad 4397000, 01 October 2003, Uncontrolled Copy, (c) BSI · i dentifying potential hazards in the system. The hazards involved may include both those
essentially relevant only to the immediate area of the system and those with a much wider
sphere of influence, e.g. some environmental hazards; · i dentifying potential operability problems with the system and in particular identifying
causes of operational disturbances and production deviations likely to lead to nonconforming products. An important benefit of HAZOP studies is that the resulting knowledge, obtained by identifying
potential hazards and operability problems in a structured and systematic manner, is of great
assistance in determining appropriate remedial measures.
A characteristic feature of a HAZOP study is the ”examination session” during which a multidisciplinary team under the guidance of a study leader systematically examines all relevant
parts of a design or system. It identifies deviations from the system design intent utilizing a
core set of guide words. The technique aims to stimulate the imagination of participants in a
systematic way to identify hazards and operability problems. HAZOP should be seen as an
enhancement to sound design using experience-based approaches such as codes of practice
rather than a substitute for such approaches.
There are many different tools and techniques available for the identification of potential
hazards and operability problems, ranging from Checklists, Fault Modes and Effects Analysis
(FMEA), Fault Tree Analysis (FTA) to HAZOP. Some techniques, such as Checklists and
What-If/analysis, can be used early in the system life cycle when little information is available,
or in later phases if a less detailed analysis is needed. HAZOP studies require more details
regarding the systems under consideration, but produce more comprehensive information on
hazards and errors in the system design.
The term HAZOP has been often associated, in a generic sense, with some other hazard
identification techniques (e.g. checklist HAZOP, HAZOP 1 or 2, knowledge-based HAZOP).
The use of the term with such techniques is considered to be inappropriate and is specifically
excluded from this document.
Before commencing a HAZOP study, it should be confirmed that it is the most appropriate
technique (either individually or in combination with other techniques) for the task in hand. In
making this judgement, consideration should be given to the purpose of the study, the
possible severity of any consequences, the appropriate level of detail, the availability of
relevant data and resources.
This standard has been developed to provide guidance across many industries and types of
system. There are more specific standards and guides within some industries, notably the
process industries where the technique originated, which establish preferred methods of
application for these industries. For details see the bibliography at the end of this text. © BSI ISB ©
1002−8028ISB © 2001 5 BS IEC 61882:2001
6 1882 Ó I EC:2001 –7– HAZARD AND OPERABILITY STUDIES (HAZOP STUDIES) –
APPLICATION GUIDE Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad 4397000, 01 October 2003, Uncontrolled Copy, (c) BSI 1 Scope This International Standard provides a guide for HAZOP studies of systems utilizing the
specific set of guide words defined in this document. It also gives guidance on application of
the technique and on the HAZOP study procedure, including definition, preparation,
examination sessions and resulting documentation and follow-up.
Documentation, as well as a broad set of examples encompassing various industries,
illustrating HAZOP examination is also provided. 2 Normative references The following normative documents contain provisions which, through reference in this text,
constitute provisions of this International Standard. For dated references, subsequent
amendments to, or revisions of, any of these publications do not apply. However, parties to
agreements based on this International Standard are encouraged to investigate the possibility
of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of IEC
and ISO maintain registers of currently valid International Standards.
IEC 60300-3-9, D ependability management – Part 3: Application guide – Section 9: Risk
analysis of technological systems
IEC 60812, A nalysis techniques for system reliability – Procedure for failure mode and effects
IEC 61025, F ault tree analysis (FTA)
IEC 61160, F ormal design review 3 Definitions For the purposes of this International Standard, definitions contained in IEC 60050(191) as
well as the following terms and definitions apply:
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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.
- Winter '11