Why Rubber Gasket inside diameter is more than flange bore?
Why Rubber Gasket inside diameter is more than flange bore?
(OP)
Hi,
I have gone through the various gasket standards EN 1514-1, ASME-B-16.20, ASME-B-16.21. And observed that inside diameter of gasket is more than the bore of the flange. Please find the attachment for easy understanding.
I don't understand why the inside diameter of gasket is more than the flange bore in all these standards!!!
To my knowledge, When gasket ID was sized larger than the flange ID, the gap that would be left from flange to flange, where the gasket is void, would cause increased turbulent flow of the media. An increase of turbulent flow leads to elevated rates of corrosion and erosion, which would take place on the flange faces. To go along with this problem, there would be an increase of unwanted media build-up, or fluid trap in this void.
Anyone please clarify my about doubt.
I have gone through the various gasket standards EN 1514-1, ASME-B-16.20, ASME-B-16.21. And observed that inside diameter of gasket is more than the bore of the flange. Please find the attachment for easy understanding.
I don't understand why the inside diameter of gasket is more than the flange bore in all these standards!!!
To my knowledge, When gasket ID was sized larger than the flange ID, the gap that would be left from flange to flange, where the gasket is void, would cause increased turbulent flow of the media. An increase of turbulent flow leads to elevated rates of corrosion and erosion, which would take place on the flange faces. To go along with this problem, there would be an increase of unwanted media build-up, or fluid trap in this void.
Anyone please clarify my about doubt.
Talk To Other Members
RE: Why Rubber Gasket inside diameter is more than flange bore?
RE: Why Rubber Gasket inside diameter is more than flange bore?
In any event the ID of the pipe and flange can change depending on the material, pressure and temperature.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Why Rubber Gasket inside diameter is more than flange bore?
It is not possible to ensure the gasket is properly centered at assembly and not projecting into the waterway if you try to center at the ID.
How much turbulence, corrosion, and unwanted media build-up do you believe happens? Is it any worse than what will occur in the valves, fittings, and other components in the pipeline?