Multiple gaskets and torque

[johcatrac]

If I use more than one gasket at a bolted joint, will it impact the torque to be applied? i.e. will the torque be greater with 2 gaskets as opposed to that with a single gasket? I would appreciate any input.

 

[david339933]

Two gaskets within a single bolted joint?....most Codes, if not all, prohibit this.

 

[johcatrac]

Thanks. Can you please indicate a couple of Codes that prohibits this?

 

Thanks. Can you please indicate a couple of Codes that prohibits this?

That would be your job.
The only code that matters is the one you are working to.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[johcatrac]

I am working to ASME VIII-1. There is nothing in there that prohibits more than 1 gasket.

 

[SnTMan]

Series or parallel?

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

 

[johcatrac]

The arrangement is
flange-gasket-spacer-gasket-flange
Spacer is 0.19" thick

 

[david339933]

Ok, that is different....two gaskets with spacer is ok. 335.2.4 B31.3, is what I was referring.
335.2.4 Gaskets.
No more than one gasket shall be
used between contact faces in assembling a flanged joint.

 

[TGS4]

Yes - it will impact the required bolt load. I would work with the gasket manufacturer to determine the best assembly bolt load.

Note that converting bolt load to torque requires knowledge of the lubricant, materials, etc.