ASTM A320 B8M ASME VIII-1Max Temp Limit
ASTM A320 B8M ASME VIII-1Max Temp Limit
(OP)
All,
Does anyone know why ASME VIII-1 puts a max temperature limit of 100F (38oC) on ASTM A320 B8M Class 1? Does this mean these bolts cannot be used in countries where temperatures can reach 40oC or where the black bulb temperature can reach much higher values?
Any thoughts on the correct approach where these bolts are specified for nozzles attached to ASME B31.3 piping which does not have the same restriction on the bolting?
Any assistance is appreciated?
Kind regards,
pipes&vessels1
Does anyone know why ASME VIII-1 puts a max temperature limit of 100F (38oC) on ASTM A320 B8M Class 1? Does this mean these bolts cannot be used in countries where temperatures can reach 40oC or where the black bulb temperature can reach much higher values?
Any thoughts on the correct approach where these bolts are specified for nozzles attached to ASME B31.3 piping which does not have the same restriction on the bolting?
Any assistance is appreciated?
Kind regards,
pipes&vessels1





RE: ASTM A320 B8M ASME VIII-1Max Temp Limit
RE: ASTM A320 B8M ASME VIII-1Max Temp Limit
I understand it means metal temp but these metals can heat up significantly under a hot sun over the course of a day therefore rendering this material unuseable for a lot of countries. I don't understand as A320 B8M is often specified in Oil & Gas industry.
Anyone got any thoughts on the B31.3 question?
Rgds,
pipes&vessels1
RE: ASTM A320 B8M ASME VIII-1Max Temp Limit
Aaron Tanzer
www.lehightesting.com
RE: ASTM A320 B8M ASME VIII-1Max Temp Limit
If you look at bolting materials under Appendix A in B31.3 there is dual certification between SA 193 and SA 320 in sharing stress lines. For B31.3 application, the maximum service temperature is well above 100 deg F for either of these bolting materials. However, read the Notes that describe cautions associated with use at higher temperatures. So, use of SA 320 above the permitted use on Section VIII, Div 1 is allowed in B31.3 provided proper evaluation is performed, like reducing stress to avoid leakage in service.