Factor of safety considered for pressure vessel structural supports

[Jaivishnu]

Hi
I am a newbie in ASME BPVC Sec VIII standard. I want to know if there are guidelines provided in the code as to the safety factor to be considered in the design of structural support for vessels. Alternatively, how are the allowable stresses for structural support materials taken? Are they considered based on some table mentioned in code?

 

[Christine74]

There are no allowable stresses or other design requirements for supports or other non-pressure components in ASME Section VIII, other than the requirement that supports that are to be welded to the vessel must be made from weldable quality materials.


-Christine

 

[SnTMan]

Jaivishnu, what Christine74 says is correct as far as it goes.

Practically speaking, if Code materials (Sec II, Part D) are used, allowable stresses may be obtained from the same. Factor of Safety (perhaps more properly design margin, but lets not get into that) on tensile stresses are generally 3 1/2 to 1. This may be overly conservative for some designs. Yield stresses are available as well and might be suitable for some design situations.

Code has no rules for design of supports and so forth, but design methods are found in numerous handbooks, allowable stresses are often prescribed.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[KevinNZ]

Our local regulations require design of vessel supporting structures and foundations to be carried to local structural loading and design codes. "Safety factor" is not term used by structural design codes. There would be loading factors.