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Who actually uses these on a regular basis? Reason I ask is that im in the middle of the NEBOSH diploma unit A and struggling to get to grips with the above, id appreciate if anyone with some in depth knowledge could spare some time and put me on the right track
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Rank: Super forum user
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safety case creation/design - high risk design e.g. fire collapse modeling for rigs and similar
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Rank: Super forum user
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HAZOPS would be used in the nuclear or other high risk industries on a large scale where there is a complex plant or operation where many small knock on effects from interuptions or changes in process flow could have a major implication further down stream.
You would look at one specific scenario, like a failure of a pipe, vessel, valve, loss of power, incident, fire and then systematically look at the impacts that this would have on the process / plant.
So for example - "pressure releif valve fails to open during heating of a water system to release excess steam generated", you would go through the standard (or industry specific) prompts for the HAZOP and list the effects, it may be up to the team then and there or process engineers/designers etc to later put in place preventative measures to mitigate these effects, e.g.
Scenario: Heater burners dont autmatically shut off
Effect: Increase in pressure down stream in pipe work 1a
Controls: Pipe work designed to operate at 500bar, secondary pressure relief valves sitauted at junction 2b lifts at 400bar, electronic feedback to flow valve to reduce flow and to heater to reduce temperature
Effect: Increase in pressure in Tank 3c
Controls: etc...
Effect: Heaters taken offline for repair
Controls: Secondary heaters used etc.
The idea is to highlight potential failings in a possible scenario or condition and ensure there are suitable controls in place to eliminate that risk.
This is a pretty basic overview but there are many useful websites out there which specialise in this, I beileve the IChemE also run courses on HAZOP in particular so you may be able to find helpful information on their website.
Des
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Rank: Super forum user
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Only those in high hazard industries.
Me, never!!
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Rank: Super forum user 
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Same here, tried to use FTA once in an accident investigation and soon gave up and went back to root cause analysis (just use the 5 WHYs). Unless you are in a high risk industry where use of HAZOP or FMEA is routine just learn enough to pass the exam then forget it. In my experience there is a lot of the unit A syllabus that you need to know to pass the exam then won't use again, including much of the case law.
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Rank: Super forum user 
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I was involved in a HAZOP many years ago when the bus company I worked for were about to introduce a fleet of buses powered by gas. So long ago I can't even remember the gas.
It was a series of "what if" scenarios and was really interesting, scientists, managers, engineers, mechanics etc.
What I especially liked was everyone embraced the "what ifs" and brainstormed the possible outcomes.
In normal risk assessments when I come up with a "what if" I usually get the "it won't happen" argument.
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Rank: Super forum user 
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Hazops( a hazard identification technique, not a risk assessment) are used all the time for new plant and managing change in many chemical and allied industries not just high risk. FTA and ETA are not used so often but the principles are worth learning to further your understanding.
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I use these techniques, HAZOP quite alot (have completetd the I Chem E HAZOP Leadership Course - that someone metioned).
ETA/FTA used sometimes.
FMEA used quite often.
These techniques, as already stated are used in the high hazard industeries - O&G/nuclear etc, probably not as often as you think in an operational context - but used in the design stages of a project/writing safety cases etc.
I work in a design organisation.
I would suggest that most 'normal' occupational health and safety people only need to know the basic idea.
You are more likely to be called a 'Safety Engineer', ' Technical Safety Engineer', 'Process Engineer', 'Principal Safety Engineer' etc rather than Health and Safety Manager/Adviser. Just Google and the jobs come up!
For those of you considering a career move - you still need to know the principles of traditional h&s, but you will more than likely need a degree in engineering, chemistry etc NEBOSH/IOSH qualifications are not likely to be enough.
Advantages - much better pay!!
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Rank: Super forum user
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Leebo,
I carry out these types of study on a weekly basis. PM me and I will try to help out
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Rank: Forum user
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HAZOP studies are used very widely in the process industries particularly in the design phase, or in support of safety cases.
FTA, ETA, FMEA, etc tend to be only used regularly in high hazard industries although are occassionaly used in (perceived) lower risk industries.
What specifically are you looking for in terms of understanding?
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Rank: Guest
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im currently studying unit A NEBOSH diploma and there seems to be a question in all the previous exams with regards to ETA FTA HAZOP FMEA after reading my course notes and other sources of info im struggling to grasp both the ETA and FTA,
I understand that the average health and safety person rarely if ever uses these concepts but id still like to get my head around them
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