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Unformatted text preview: m can be hazardous and proper operating sequences and instructions
are critical, or when there has been a substantial change of intent in a late stage. Additional
data such as commissioning and operating instructions should be available at this time. In
addition, the study should also review all actions raised during earlier studies to ensure that
these have been resolved.
5.4.4 Operation and maintenance phase The application of HAZOP should be considered before implementing any changes that could
effect the safety or operability of a system or have environmental effects. A procedure should
also be put in place for periodic reviews of a system to counteract the effects of “creeping
change”. It is important that the design documentation and operating instructions used in a
study are up to date. 14
41 © BSI 28 1002−80ISB ©
August 2001 BS IEC 61882:2001
6 1882 Ó I EC:2001
5.4.5 – 16 – Decommissioning or disposal phase Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad 4397000, 01 October 2003, Uncontrolled Copy, (c) BSI A study of this phase may be required, due to hazards that may not be present during normal
operation. If records from previous studies exist, this study can be carried out expeditiously.
Records should be kept throughout the life of the system in order to ensure that the
decommissioning issues can be dealt with expeditiously. 6 The HAZOP study procedure 6.1 Initiation of the study The study is generally initiated by a person with responsibility for the project, who in this
guide is called “project manager”. The project manager should determine when a study is
required, appoint a study leader and provide the necessary resources to carry it out. The need
for such a study will often have been identified during normal project planning, due to legal
requirements or company policy. With the assistance of the study leader, the project manager
should define the scope and objectives of the study. Prior to the start of a study, someone
with an appropriate level of authority should be assigned responsibility for ensuring that
actions/recommendations from the study are implemented.
6.2 Definition of scope and objectives of the study The objectives and scope of a study are inter-dependent, and should be developed together.
Both should be clearly stated, to ensure that:
· t he system boundaries, and its interfaces with other systems and the environment are
clearly defined; · t he study team is focused, and does not stray into areas irrelevant to the objective. 6.2.1 Scope of the study This will depend upon a number of factors, including:
· t he physical boundaries of the system; · t he number and level of detail of the design representations available; · t he scope of any previous studies, whether HAZOP or other relevant analyses, carried out
on the system; · a ny regulatory requirements which are applicable to the system. 6.2.2 Objectives of the study In general, HAZOP studies seek to identify all hazards and operating problems regardless of
type or consequences. Focusing a HAZOP study strictly on identifying hazards will enable the
study to be completed in shorter time and with less effort.
The following factors should be considered when defining objectives of the study:
· t he purpose for which the results of the study will be used; · t he phase of the life cycle at which the study is to be carried out (for details see 5.4); · p ersons or property that may be at risk, e.g. staff, the general public, the environment, the
system; © BSI ISB ©
1002−8028ISB © 2001 15
51 BS IEC 61882:2001
6 1882 Ó I EC:2001 – 17 – · o perability problems, including effects on product quality; · t he standards required of the system, both in terms of safety and operational
performance. Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad 4397000, 01 October 2003, Uncontrolled Copy, (c) BSI 6.3 Roles and responsibilities The role and responsibilities of a HAZOP team should be clearly defined by the project
manager and agreed with the HAZOP study leader at the outset of the study. The study leader
should review the design to determine what information is available and what skills are
required from the study team members. A programme of activities should be developed, which
reflects the milestones of the project, to enable any recommendations to be carried out in a
It is the study leader's responsibility to ensure that an appropriate communication system is
set up and is used for transferring the result of the HAZOP study. It is the responsibility of the
project manager to ensure that the results of the study are followed up and decisions
regarding implementation made by the design team are properly documented.
The project manager and the study leader should agree whether the HAZOP team activity is
to be confined to identification of hazards and problem areas (which are then referred back to
the project manager and design team for resolution) or wheth...
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