Gasket dimension of wafer valve

[coolniks37]

Hi

I am connecting a 12" wafer check valve with a 12" ANSI 150 RF flange.
I need to use a custom gasket between these. How do I determine the dimensions of the gasket?

 

[TugboatEng]

ANSI 150 has standard dimensions.

https://sealingdevices.com/150-lb-ring-gasket-ansi-flange-dimensions/

16-1/8 x 12-3/4 inches. Thickness is your choice.

 

[coolniks37]

Thanks a lot @TugboatEng. I am seeing that the ID of the valve is quite smaller than the ID of the standard ring gasket. Will that pose any issue?

 

[LittleInch]

Don't see why you need a custom gasket?

Why do you think this?

Gaskets don't extend inside the ID of the pipe.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[TugboatEng]

I'm assuming custom refers to the material choice.

If the check valve bore is substantially smaller than the flange inside diameter, I have to ask, are you using slip fit flanges?

 

[coolniks37]

Hi LittleInch,

The medium handled is corrosive. I want to avoid crevice corrosion from happening.

 

[LittleInch]

Using an RF flange you either need to use CRA or face the flanges with inconel or similar.

A gasket won't stop crevice corrosion.

IMHO.



Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[mk3223]

The medium handled is corrosive.

For the corrosive fluid, is any special material or fabrication specified for the piping and valves?