Bolt torque calculation in flanges with spiral wound gaskets
Bolt torque calculation in flanges with spiral wound gaskets
(OP)
Hi, I am calculating the correct bolt torque for some flanges with stainless steel spiral wound gaskets, graphite filled, but I cannot find the modulus of elasticity of the gasket itself. I found values of m and Y, but Y is the seating stress, which is the initial value before to apply the correct torque value to have the correct sealing. I'm looking for the "spring costant" for these gaskets.
Suppliers don't give so much infos.
Any help is really appreciated.
Ciao
Antonio
Suppliers don't give so much infos.
Any help is really appreciated.
Ciao
Antonio





RE: Bolt torque calculation in flanges with spiral wound gaskets
Also, the elastic modulus is not a constant value like you would find for typical metals. It is different in loading compared to unloading - often very different. That's why the gasket manufacturers won't give you a "number", it's because there is no one number.
What about following the "guidance" found in ASME PCC-1 and use their torque charts?
RE: Bolt torque calculation in flanges with spiral wound gaskets
Johnny Pellin
RE: Bolt torque calculation in flanges with spiral wound gaskets
See you on next thread.
Antonio
RE: Bolt torque calculation in flanges with spiral wound gaskets
It is my understanding that for piping systems, spiral wound gaskets are simply torqued to nominal values based on the bolt size and material.
Flexitallic and other manufacturers offer bolt torque tables in thier sales literature.
Why are you calculating bolt torques ?
-MJC