Page 138 - GarlockFluidSealing2010

D-20
Flange Types
Flat Face
Unconfned Gasket
¦ Mating faces of both fanges are fat
¦ Gasket may be ring type, or full face, which covers
the entire face both inside and outside the bolts
Raised Face
Unconfned Gasket
¦ Flange sealing surface is reduced to achieve higher
seating stress
¦ Gasket is usually ring type, contained entirely
within bolts
Ring Joint
Also Called "API Joint" or "RTJ"
¦Both fange faces have matching fat-bottomed
grooves with sides tapered from the vertical at 23°
¦Gasket seats on fat section of fange between bore
and ring joint groove
¦Garlock spiral wound gaskets can replace solid
metal ring gaskets
Male-Female
Semi-Confned Gasket
¦ Depth of female (recessed) face normally equal to
or less than height of male (raised) face, to prevent
metal-to-metal contact during gasket compression
¦ Recessed O.D. normally is not more than 1/16"
larger than the O.D. of the male face
¦ Joint must be pried apart for disassembly
Tongue and Groove
Fully Confned Gasket
¦ Groove depth is equal to or less than tongue height
¦Groove usually not over 1/16" wider than tongue
¦Gasket dimensions will match tongue dimensions
¦ Joint must be pried apart for disassembly
Groove to Flat
Fully Confned Gasket
¦ One fange face is fat, the other is recessed
¦ For applications requiring accurate control of gas-
ket compression
¦ Only resilient gaskets are recommended—spiral
wound, hollow metal O-ring, pressure-actuated,
and metal-jacketed gaskets