Can anybody give me the main differences between the Risk analysis and Hazop study performed for the process?

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

Probably an over a simplication of a complex area, but a starter for ten.

Paddy Kitching,
Sir .
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?

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.

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.

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).?

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.

Paddy Kitching,
Thank you sir .

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 ?