Safety Factor in 'ASME DIV.1&2'

I don't know, but I bet Google does.

^-^

I don't know where, or even if, it is explicitly given, but you can get an idea of what it is by comparing the 'Allowable Stress' for your selected material, given in Part II, Section D, with the basic material characteristics given in Part II, Section A or B. The question remains though, as to why you would want to know it given the data in Part II, Section D.

Drew

"Safety Factor" really has no meaning regarding pressure vessels and piping.

Do you mean the ratio of design pressure to the pressure that causes rupture ?

How do you want to evaluate the affects of temperature ?

Are you interested in the minimum pressure that causes permanent deformation ? (This is considerably less than burst pressure) How do you define failure ?

Or are you defining failure as the point where the bolted flanged joints begin to leak ? (This pressure is less than the pressure that causes permanent deformation)

Looking at the allowable stress levels versus the material yield ( at temperature) is a place to start.....

This is your first involvement with pressure vessels, isn't it ?

I just designing a safety valves
and determining of body wall thickness.

Maximum allowable stress of body material with
calculation of UG27 is determined minimum wall thickness.

I must be applying safety factor at this value.
If asme code have a this safety factor, I can apply value

Yes, you can.

Be sure to sign off on your work.

Take responsibility for your decisions.