# Thread: Quantitatively risk assessment, qualitative risk assessment

1. ali
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## Quantitatively risk assessment, qualitative risk assessment

What is the different between quantitatively risk assessment and qualitative risk assessment?

2. Spons Circuit
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3. Junior Member

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## difference

Originally Posted by ali
What is the different between quantitatively risk assessment and qualitative risk assessment?
dear ALI,
Qualitative RA is a method to recognize risk quantitatively. The techniques used for this are HAZOP, PHA WAHT-if.etc. in all these u can recognizes what will be effect of any unsafe condition quantitatively. For example consider a hydrocarbon STORAGE TANK and use guide word MORE then unsafe condition will be MORE filling of Hydrocarbon and consequence will be SPILLAGE, FIRE, TOXIC release etc. Hear you recognize hazard quantitative way.
On the other hand in QUALITATIVE approach u can quantify the hazard in terms of probability , likelihood, severity etc. Again as above example, we can assign severity 4 out of 4 and probability 1 out of 4 So risk will be 4*1=4.technique used for this is like FMEA HIRA etc.

Well sir i am pursuing M-TECH in HSE and did b-tech in SAFETY AND FIRE eng and having a little experience of 1 year, hopefully i replied your answer as per my present knowledge.

4. -

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Does anyone has 18002 2008 version?

6. Member

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Jan 2009
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Hi sumit.alok
Plz help me to get these.
What is risk?
how to calculate risk?
wat is ISO curves? why reqired?
What is FN curves? Why required? (Significance)
How to decide frequency of failure?

Thanks

7. Member

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Dec 2008
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To: aniket00786

Please refer to "Chemical Process Quantitative Risk Analysis" book from CCPS of AIChE, and you wil find all you answers about QRA's

Milton.

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good

9. Member

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Hi All,
Any one have mond index calculation in Excel
plz help

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## Re: Quantitatively risk assessment, qualitative risk assessment

thank you so much