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ASME B31.3 Impact test requirement

ASME B31.3 Impact test requirement

ASME B31.3 Impact test requirement

(OP)
Reviewing some PI & D for a new project came across a piping spool. Piping spec calls for :
Mat: A-106 Gr B.
Design Condi:-20°F - 750°F
No mention of impact test requirements, even though, it mentions "according to ASME B31.3".

This particular piping spec allows following :
 
Pipe Size    Schedule       
4"    Sch. 160 or greater       
6"    Sch. 120 or greater       
8"    Sch. 100 or greater       
10"    Sch. 80 or greater       
12" thru 16"    Sch. 60 or greater       
18" and up    Sch. 40 or greater    
As you can see, everything above 6" (sch 120) is thicker than 0.5", so according to ASME B31.3 (2008) they need to be impact tested.

Can anyone confirm my appreciation?

How can I take temp reduction(s) due to stress?

Thanks,

Corgas

RE: ASME B31.3 Impact test requirement

Why do you need the -20 MDMT?

RE: ASME B31.3 Impact test requirement

(OP)
stanweld :

MDMT has been speced out in piping spec as -20 °F.Whoever wrote piping spec selected those ranges.

Design was done by local consulting eng firm and they adopted this spec.

Point is, thickest pipe we have found it is only good to +9 °F (according to ASME B31.3)

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