MIL-PRF-32187, PERFORMANCE SPECIFICATION: GASKET, HYBRID, FLAT AND RAISED FACE FLANGE, FIRE RESISTANT, SHIPBOARD USE (24-FEB-2005)

MIL-PRF-32187, PERFORMANCE SPECIFICATION: GASKET, HYBRID, FLAT AND RAISED FACE FLANGE, FIRE RESISTANT, SHIPBOARD USE (24-FEB-2005)., This performance specification covers hybrid gaskets designed for sealing ASME B16.5, Class 150, flat and raised face flanges in fuel and lube oil piping systems. Hybrid gaskets are fire resistant and are intended for shipboard use. Hybrid gaskets are defined as gaskets fabricated using two or more materials usually an elastomeric compound serving as the primary seal and an enveloping graphite material serving as the fire resistant seal. Hybrid gaskets are classified by the following types, as specified: Type I - Two circular, concentric seals recessed into the surface of a metal ring; an inner elastomeric seal (primary seal) and an outer flat graphite sheet material seal (fire resistant seal). Type II - Two circular, concentric seals recessed into the surface of a metal ring; an inner elastomeric seal (primary seal) and an outer spiral wound graphite seal (for fire resistant seal). Type III - Multiple circular, concentric seals of sheet graphite material, recessed into the surface of a self-locating metal ring.