Hazid vs Hazop

5/24/2018 Hazid vs Hazop

1/5

J RAMESH

J RAMESH BABU

Managing Director at Jadawi Risk Bureau (JRB), Global Technical Safety & Risk Consultants

Predominantly HAZOP deals with process related hazards, HAZID deals with non or other than

process related hazards like facility hazards etc. HAZOP focuses on the equipment or pipeline or piece

of equipment as node, whereas HAZID takes the facility as a node. HAZOP deals with the internal

hazards of the equipment and HAZID deals with the external hazards. While HAZID provides inputs

for the COMAH or QRA, HAZOP provides input for the design, operation and maintenance etc. Both

techniques use the guidewords to initiate the thoughts making the group hazard identification

systematic. Both are complimentary to each other.

Elangovan

Elangovan MSenior Safety Engineer at Technip

HAZID study never look in to OPERATION related scenarios. HAZID is an early

stage(CONCEPTUAL, FEED) hazard analysis tool in plant life cycle, which identifies scenarios with

consequence affecting beyond plant boundary.

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J RAMESH

J RAMESH BABU

Managing Director at Jadawi Risk Bureau (JRB), Global Technical Safety & Risk Consultants

To supplement what has been discussed earlier HAZID is used in all stages. Though HAZID is very

handy as PHA tool during early stages for plant life cycle in making crucial decisions like site

selection, layout, identification of Major Accident Scenarios etc it is done at various stages of plant life

cycle including operational and decommissioning phase. Many corporate standards including ADNOC,UAE insist on this requirement. Utility of HAZID varies depending on the stage we use it. For example

during Construction stage, construction stage related issues are discussed and in operational stage

issues like Management of Change are also dealt with. Boundaries of HAZID can be defined

depending on the corporate philosophy and other supplementary tools used by the corporate to avoid

overlapping of boundaries/ duplication of issues.

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David

David Graham

Process Safety Professional
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2/5

HAZID

This is what I wrote for Bureau Veritas a few years ago:

http://www.bureauveritas.com/wps/wcm/connect/bv_com/group/services+sheet/service_sheet_1068

HAZOP

http://www.us.bureauveritas.com/wps/wcm/connect/BV_USNew/local/Home/Our-

Services/Industrial_Asset_Management/Hazard_and_Operability_Study_(HAZOP)/IND_Hazard%20and%20Operability%20Study_HAZOP/

The above is just indicative.

You can get the definitions and detailed procedures from UK IChemE

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Thank you everyone

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David

David Graham

Process Safety Professional

More detail:

HAZID is done at a very early stage in the project, at the scope and flowsheet stage.

HAZOP is done after the PIDs have been issued for approval, for example when the Client and

Contractor have agreed that the process has been sufficiently developed.

The HAZID and HAZOP systems I work with are not free of charge. They belong to the particular

Client or Contractor I'm working for.

I have my own systems for HAZID and HAZOP for other companies who don't have systems e.g

Middle East companies who prefer to issue guidelines rather than procedures. These are not free

either.

Use Google to get free information or attend an IChemE or AIChemE course on hazard study.

thanks everyone for ur knowledge sharing exercise

Safety & Fire Prevention Team Coordinator at Total Upstream Company Nigeria

Ramesh, thanks for your explanation. It si quite educative.

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Kadayam. R.
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3/5

Kadayam. R. Ramasubramanian

Independent Consultant - Process Engineering & Safety

HAZID ( Hazard Idnetification): (Shell)

HAZID (Hazard Identification) is a technique for early identification of potential hazards and threats.

The technique has two styles, Conceptual and Detailed and should be applied at the very outset of a

new venture or during the early stages of a development. I t is therefore likely to be the first formal

HSE-related study for any new project. The major benefit of HAZID is that early identification and

assessment of the critical HSE hazards provides essential input to project development decisions. This

will lead to safer and more cost-effective design options being adopted with a minimum cost of change

penalty.

The HAZID technique is:

a means of identifying and describing occupational HSE hazards and threats at the earliest practicable

stage of a development or venture

a meeting employing a highly experienced multi-discipline team using a structured brainstorming

technique, based on a checklist of potential HSE issues, to assess the applicability of potential hazards a rapid identification and description process only, not a forum for trying to solve potential problems.

HAZOP ( Hazard & Operability Study): (ICI)

Hazard and Operability study is a formal, systematic, critical examination of the process and

engineering intentions of the facilities to assess the hazard potential due to mal-operation or mal-

function of individual items of equipment and the consequential effects on operation ofthe facility as a

whole.

The method identifies the possible hazards and postulates possible accident scenarios. The safety

features provided in the design are then reviewed to determine whether the safeguards are adequate or

not. Actions are recommended if deficiency is found in the safeguards provided. The processdemonstrates to the owner / management that prudent steps have been taken to make the installation as

safe as practicable.

Hazop is done after the design reviews are completed and the P&IDs are issued. After the Hazop,

when all the recommendations are implemented, the P&Ids are approved for construction.


SenthilKumar T.,Udai C.and14 otherslike this

John

John Boyd

Senior Technical Safety and Risk Engineer - LNG at Origin Energy

Yeah .. I agree with most of the comments here.

FYI ... I have been a faciliatator for too many years in the Oil & Gas and Mining industries and my

feeling is that we tend to confuse and muddy where and when we use each type of study.

Hazid (with or without formalised RA / Matrix etc.) can be used at any time in the life cycle of a plant

from early project life to decommissioning. It is a very flexible tool and can be used to identify activity
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4/5

/HSE / project risks via brainstorming in a workshop environment. Production of a report post

workshop draws a line in the sand at how the project or work schedule risks are being addressed at that

period in time. If there are any incidents during the project ... any regulator or incident investigator can

review the reports to ensure due diligence by the design / project team.

From a Hazid, a risk register can be developed which can be re-visited as the work progresses.

Hazop on the other hand is a structured , formal method of assessing robustivity of a process design or

crtical procedure and should follow the international standard IEC 61882.

For a process design it should assess P&IDs at the 'frozen design' position (as per 61882) and should

not be used as a 'design forming' tool - Hazid and other tools are good for that .

Hazop is, by its generic nature a design testing tool where designers and operators in a workshop

environment, led by a suitably qualified facilitator, challenge the 'ready' design by theoretically

stretching it outside of its normal parameters and proving that the system has adequate protection and is

suitable to go to the next phase in the design process ( if its a large installation) or to be constructed . A

good Hazop study should result in very few actions ... proving that the design is indeed ready for

Hazop. I have been asked in the past to review Hazops by others which resulted in over 200 actions ??

The IChemE have inimated that Hazop is being abused and that some engineers / project managers use

it to design systems .. they use PFDs instead of P&IDs etc, etc and have no real respect for howimportant (with legal conotations) Hazop is...

In my extended journey through industry I have seen various Hazop titles such as Conceptual Hazop,

Detailed Design Hazop, Course Hazop, 'Easter' Hazop ... no good .... there's just Hazop and if the

design goes wrong and you have to bear witness in court ... just remember a 'Course' Hazop by

definition is not at the 'frozen' design position, therefore not ready for Hazop .. so try to defend that fact

and that you, as the Facilitator, allowed it to happen.

Apologies for waxing on ... but Hazid and Hazop are very important safety tools and should be kept

completely separate.

Hazop under IEC 61882 is one of the few standards that have been accepted verbatim world wide. In a

world of major process incidents that shows how important the tool is for the Process Industry.


Peter U.,Salah Uddin A.and10 otherslike this

o April 1, 2013

GS

GS Baveja

Adviser - Business Development at Next Gen Oil & Gas Private Limited

As per experts & consultants in the field, the HAZID study is a tool for Hazard Identification, used

early in any project as soon as the PFD (Process Flow Diagrams), basic heat and mass balances, and

Plot Plans or Layouts are developed. Existing site infrastructure, weather, and geo-technical data are

also considered to model the Hazard, these being a source of external hazards.

Generally method is a design-enabling tool, acting to help organize the Health Safety Environment

related deliverable in any Project. The structured brainstorming technique typically involves designer

team and client personnel from engineering disciplines, project management, commissioning andoperations groups.
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5/5

The major findings and hazard ratings help to deliver HSE compliance and form part of the project

Risk Register required by many licensing authorities or bodies.

Mubashir Chouhdry

Mubashir Chouhdry M.Eng., P.Eng., PMP

Project Engineer

a very beneficial thread...........thanks to all who shared their knowledge........truly appreciated

o Likeo Flag as inappropriateo 5 months ago

Don

Don ADODE CSP, CFPS, TUV FSE

Senior Loss Prevention Engineer with the Technical Safety Group at Saudi Aramco

Sanjeev,

HAZOPs deals with inside the process. That is, hazards/risks that are internal to the process. These

hazards will directly affect the process from safety or operation-ability point of view. Note that with

HAZOPs, the focus is the process. Evaluation involves node by node using guide words. The focus is

process related hazards.

However, HAZID deals with the outside of the process. That is, risks or hazards that are external to the

process. With HAZID, the focus is not the process. Checklists are usually used for HAZID. The focus

is physical, ergonomics, chemical or biological hazards.

Both methodologies can be used at any stage of the life circle of a plant. However, note that HAZID is

a critical step in QRA or BRA studies.

Don
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Hazid vs Hazop