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API 650 , Section 5 , shell design

API 650 , Section 5 , shell design

RE: API 650 , Section 5 , shell design

The definition of stress is force per unit area. Area is measured in length x length. One of the "lengths" is in this case thickness. You use the corroded ( smaller ) thickness to calculate the stress ( which will come out higher than if you used the nominal thickness ) and compare that to the allowable stress.

Allowable stress is not ( usually ) calculated based on a material thickness, rather it is determined from the material properties modified by the design conditions ( temperature, risk, etc ).

I fear that by your questions, you may not be accustomed to using API 650 and given the risk to public safety if it fails due to a flawed design, you should consult an expert who is familiar with the code. Or at least have your design checked by one skilled in the art of such tank design.

RE: API 650 , Section 5 , shell design

am reading API 650 for the first time, actually i started working few days ago , of course my design well be checked

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