Bolt tightening torque for EPDM gaskets
Bolt tightening torque for EPDM gaskets
(OP)
We have to use raised face steel flanges mating flat face flanged cast iron valves.
I know that it is not recommended to use iron flat face flanges with raised face steel flanges, but we don“t have time to buy new flanges.
We are using:
-Rubber gaskets, EPDM, 1/8" thickness, brand: S.H. but I cannot find information from the vendor of the gasket.
-Class 150 ANSI B16.5 1/16" slip-on, raised face flanges, A105, carbon steel. Diameters: 4", 6", 8" and 10".
-Water, design pressure: 150psi
I want to know if somebody could comment on the case and if someone know what would be a recommended tightening torque for the bolts that could be safe for the cast iron valve flanges.
I know that it is not recommended to use iron flat face flanges with raised face steel flanges, but we don“t have time to buy new flanges.
We are using:
-Rubber gaskets, EPDM, 1/8" thickness, brand: S.H. but I cannot find information from the vendor of the gasket.
-Class 150 ANSI B16.5 1/16" slip-on, raised face flanges, A105, carbon steel. Diameters: 4", 6", 8" and 10".
-Water, design pressure: 150psi
I want to know if somebody could comment on the case and if someone know what would be a recommended tightening torque for the bolts that could be safe for the cast iron valve flanges.





RE: Bolt tightening torque for EPDM gaskets
RE: Bolt tightening torque for EPDM gaskets
Dig into web pages or garlock, flexitallic or may be kemptchen of Germany (they have ANSI gaskets). You`ll probably find there practical torque tables instead of doing calculations.
RE: Bolt tightening torque for EPDM gaskets
RE: Bolt tightening torque for EPDM gaskets
1) Crack you CI flanges or
2) Over-compress the EPDM gasket because of the small contact area of the RF flange.
You can use any hard, chemically/thermally compatible gasket material for these adaptors. Use a full face EPDM gasket instead of a ring gasket.