Style HKWOI with the addition of an inner ring. The inner ring also
serves several functions. Primarily, it provides radial support for the gasket on the I.D. to help prevent the occurrences of buckling or
Its I.D. is normally sized slightly larger than the I.D. of the flange bore, minimizing turbulence in process flow. The inner rings are normally
supplied in the same material as the spiral wound component. Spiral wound gaskets to ASME B16.20, designed to suit ASME B16.5 and ASME B16.47 flanges.