Material listed in B31.3 Vs ASME SecII D.

[Surinderpal]

Applying for CRN category "C". They are not flange valves. I need help, material of the body is St St 305 ASTM A-240. it is listed material but Code listed allowable stress for 100F temp only and product is designed for 150F. I checked ASME SecII D, material is listed there SA-240, 305 AND Su is listed in U table and yield is in Y-1 table.
Values are different B31.3
Tensile = 70ksi
yield = 25ksi
Allowable Stress = 16.7 ksi @ 100F
While
Values in ASME Sec II D
Tensile = 75@ 100F and 71.1 at 150F (Table U)
Yield = 30@ 100f and 26.7 @ 200F

Is there provision in B31.3 that data from AMSE SEC II D can be extrapolated for elevated temp and used in the calculation.


Regards,

 

[SPDL310]

If I understand correctly you are attempting to get CRN approval for valves be placed in a B31.3 system. You should be producing your valve to a standard that is listed in B31.3. The valve standard you are using should give guidance as to where you get elevated temperature material properties from. If you produce vales to a standard that is not listed in B31.3 you need to look at the relevant sections for incorporating unlisted components.

Regards,

 

[Surinderpal]

Dear SPDL310,
Thank you for reply, I really appreciate.
My understanding is that design can be registered if requirements are not converted by provisions of a recognized North American standards but manufactured to comply with either AEME 16.34, ASME31.3 or ASME Sec VIII D1 as supported calculations or witness proof test, marking, materials etc.
I read ASME B31.3, material A-240, 305 is listed material but allowable stress is only up to 100F.
then my second approach is to register with ASME Sec VIII D1, (material data is available in Sec II D)
if we have to register complying with ASME Sec VIII D1. can you please HELP with calculations, mainly wall thickness, it is UG-27?

and how to calculate allowable stress at elevated temp. etc.
to be honest I am not very much familiar with codes
Design temp is 150, pressure is 325

Regards,

 

[KevinNZ]

Surinderpal
I believe you can not use a piping code, B31.3, to design a valve. You should start with B16.34, See section 5.1.
There are limits to material use for pipe systems in B31.3. As you point out, the use of the 305 is limited in B31.3 to 100F