Topics: What are differences between Risk Analysis and HAZOP study of a process?
on General Discussion
What are differences between Risk Analysis and HAZOP study of a process?
Can anybody give me the main differences between the Risk analysis and Hazop study performed for the process?
03-26-2014 07:31 PM
Risk assessment looks at the potential things that might cause problems and rates them. Hazops are a process that include the elements of risk assessment but follows through in great detail to ensure all possible operating (among many elements) deviations are recognised the associated risks assessed and action are put in place (and completed , part of the process) to ensure all risks identified are suitably mitigated
03-26-2014 09:37 PM
Probably an over a simplication of a complex area, but a starter for ten.
03-27-2014 12:15 AM
Are the Contents in Risk analysis and Hazop the same, Except that the Hazop is a detailed version of Risk Analysis.?
Can you briefly mention the major point to be included in Hazop?
03-27-2014 02:27 AM
I would suggest risk assessment is a subset of the HAZOP process, it covers Hazop stages 1 to 3 if i remember correctly..
In my mind the HAZOP process is not just about risk identification and assessment, its about the processes to ensure the design, build, commissioning and the operation phases recognise the risks and take suitable action to eliminate or mitigate the risk identified before you walk into "crisis".
Perhaps others would like to comment.
03-27-2014 04:48 AM
Hazop is a detailed assessment of the consequences of every conceivable set of circumstance each part of the process could experience. It does this by asking the same questions of each line, valve etc. I.e. what happens at low temperature, high temperature, high pressure, low pressure, vacuum, high flow, low flow, no flow reverse flow etc. a risk assessment looks at the whole process and asks what could happen overall, what would the consequence be and how likely is it. Hazop looks at consequences but assumes that the event in question has happened.
03-27-2014 07:27 AM
Thanking you both, Paddy Kitching & Matt Hardin for the valuable information.
I would further like to know , about the essential components or the essential points , that should be included in HAZOP study . And could it be said that , HAZOP is a combined product of Risk analysis and FMEA (Failure mode effect analysis).?
03-27-2014 10:19 AM
The acronym for the key words used in HAZOP is "No MLA PRO" (ie., No, More than, Less than, As well as, Part of, Reverse, Other than) Applying these to the parameters of T, P etc will define the deviation. The Consequence of such a deviation will be analyzed next in terms of severity and probability. The result is mapped in the "Risk Assessment Matrix" Based on the result, suitable "recommended action" is suggested.
03-27-2014 01:11 PM
Kishore, FMEA is a separate technique normally used for specific items of equipment to improve reliability, for detail of HAZOP this link might be useful as an overview, expanding on the above comments, http://www.pqri.org/pdfs/mtc/hazop_training_guide.pdf
Suggest you need to read around the subjects, HAZOP is one tool the the kit for risk reduction , lumping them together is not particularly useful.
03-27-2014 04:02 PM
Thank you sir .
03-27-2014 06:44 PM
Paddy sir, Can we apply Hazop technique to the stagnant risks like some hydrocarbon storage tank or vessel containing chemical or gas bullets ? or the Risk assessment will be applicable only in such case ?