Not Considered items in Hazop study??
Not Considered items in Hazop study??
(OP)
Friends,
I recently came across a HAZOP study which included the following in NOT CONSIDERED list:
1. Failures of Manual valves
2. Operator Error
3. Passing of NRVs and PSVs
Is it OK?
Pl give your views.
Thanks in advance.
I recently came across a HAZOP study which included the following in NOT CONSIDERED list:
1. Failures of Manual valves
2. Operator Error
3. Passing of NRVs and PSVs
Is it OK?
Pl give your views.
Thanks in advance.





RE: Not Considered items in Hazop study??
The idea of a HAZOP is to identify hazards and risks to a system. To specifically list the 3 hazards/risks mentioned indicates there was some sort of thought process that went into it, I don't understand what it was. Perhaps they were covered under a separate risk assessment, but if so it would have been prudent to note.
A HAZOP, risk assessment, constructability review and other similar processes will only provide optimum results if the proper personnel are gathered to do them. Garbage in = Garbage out.
Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com
RE: Not Considered items in Hazop study??
As far as I know, the failure of manual valves should always be included in HAZOP scope. Operator errors is quite a bit large area for risk analysis and is usually carried out separately - mostly included in extended plant operating manual, incidents & near misses worksheet or some other type of risk assesment. For NRVs and PSVs issues I cannot recall they were being part of HAZOP risk items.
Regards,
http://antwrp.gsfc.nasa.gov/apod/astropix.html
RE: Not Considered items in Hazop study??
RE: Not Considered items in Hazop study??
There are several sources that address HAZOP's - API 750, Management of Process Hazards; the AIChE-CCPS book,
Guidelines for Hazard Evaluation Procedures; and OSHA 29
CFR 1910.119. Also API 580, Risk Based Inspections.
There are also other methodologies besides HAZOP's that are used to achieve quantitative risk assessments - Failure Mode & Effects Analysis (FMEA), and Fault Tree Analysis. And there are just standard design risk assessments.
That is why I mentioned above that because those items were specifically mentioned as not being addressed by the HAZOP, chances are they were addressed by another means.
Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com
RE: Not Considered items in Hazop study??
there is sometimes quite a bit of debate in HAZOP's of what constitutes "Double Jeopardy" and perhaps this is what is referenced.
if it is a HAZOP that is worth its salt, it should have the names of those involved and you should ask them.
RE: Not Considered items in Hazop study??
RE: Not Considered items in Hazop study??
RE: Not Considered items in Hazop study??
RE: Not Considered items in Hazop study??
Sabatoge should be covered under a security risk assessment.
Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com
RE: Not Considered items in Hazop study??
http://virtualpipeline.spaces.msn.com
"We can't solve problems by using the same kind of thinking we used when we created them." -Albert Einstein