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API 581 Severity Index?

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Corroneer

Corroneer

Mechanical
Joined
Jan 13, 2006
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I have a similar question to this thread (thread338-366133).

What is the basis of assigning these numbers to the different damage mechanisms? e.g. Why 5000 for High in Cl-SCC; 1000 in Carbonate SCC and 100 in Ammonia SCC?

Is it based on experience only? It would be a bit strange since API 581 is for quantitative assessment!

Regards,
 
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