gasket design

[mielke]

is it still pretty popular/common to calculate bolt torque for a gasketed flange to use 'M' and 'Y' values?

 

[TGS4]

For designing the flange or for the as-installed value of bolt stress?

 

[mielke]

for designing the flanges.

 

[TGS4]

IF you design the flanges using ASME Section VIII, Division 1, Appendix 2, then it is the only way. The same is true for Division 2, Article 4.16.

As a note, in designing flanges, you don't actually calculate a bolt torque, you calculate a bolt load. Based on that load, you check your flange design to determine if it is acceptable. For Division 1 flanges, make sure to note Appendix S.

 

[mielke]

Thanks TGS4 i have been talking to a gasket vendor and asked about the M and Y values for his gasket and he told he didn't know those values and said that that was an outdated method noone uses anymore.

You're correct I get the bolt load from that and using that bolt load i can calculate the bolt torque to figure out how much I need to tighten down the bolts.

 

[TGS4]

Just a second. The values of bolt load (as an example) from Appendix 2 of ASME Section VIII, Division 1, as for the DESIGN of the flange. DO NOT use these values of bolt load to calculate what you ACTUALLY use on the bolt. Refer to Appendix S and PCC-1, and of course the gasket manufacturer's recommendations.

 

[SnTMan]

...of which, I think I'd try a different one.

Regards,

Mike