Catalog for WOODCO USA Pressure Control Equipment, Sup. 3

Page 14 

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2.4 Ring Gasket Profile Designs (Types) Illustrated and Explained
   

R TYPE R TYPE R TYPE RX TYPE SRX TYPE BX TYPE SBX TYPE
OVAL RING GASKET OCTAGONAL RING GASKET COMBINATION RING GASKET PRESSURE ENERGIZED RING GASKET PRESSURE ENERGIZED SUBSEA RING GASKET PRESSURE ENERGIZED RING GASKET PRESSURE ENERGIZED SUBSEA RING GASKET
  
The illustrations show the various types of API ring gaskets in cross-section. Except for the offering of styles of R type ring gaskets, each gasket shown has a special intended purpose and in some cases a clear advantage in application. API does not specify pressure balancing holes in all RX ring gaskets as illustrated above. All RX ring gaskets without these holes may have modification to include pressure balancing holes. All RX and BX ring gaskets may also have vent holes to the equipment bores to facilitate subsea make-up of connections (see the profiles of SRX and SBX ring gaskets).
R type oval ring gaskets have the greatest application of all ring gaskets used in industry today. These gaskets fit API 6B and ASME B16.5 flanges. Oval type R gaskets fit all current specification ring grooves, as well as "round bottom" ring grooves found in some older flanges.
R TYPE
OVAL RING GASKET
   
R type octagonal ring gaskets offer an alternative to the more common (for wellheads) R type oval ring gasket. These gaskets also fit API 6B and ASME B16.5 flanges. R type octagonal ring gaskets fit all current specification ring grooves, but operators must use care to avoid their use in "round bottom" ring grooves found in some older flanges.
R TYPE
OCTAGONAL RING GASKET
   
R type combination ring gaskets have different designations on each side. Combination ring gaskets allow the connection of flanges, with the same bolt circle measurement and number of bolt holes, that have different designated gaskets. (Such connected flanges may or may not require specially dimensioned bolts).
R TYPE
COMBINATION RING GASKET
  
RX type ring gaskets have a non-symmetrical octagonal cross-section. This non-symmetrical geometry provides an unbalanced contact with the flange ring groove resulting in coining and sealing on the O.D. of the gasket only. The RX type ring gasket geometry provides a pressure-energized self sealing effect. RX type ring gaskets increase the stand-off between flange faces and flange bolt length must accommodate this additional stand-off.
RX TYPE
PRESSURE ENERGIZED RING GASKET
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