Pocket Guide to Flan..

wrench size required to fit the nut. Table 4-19 is the rec-
ommended bolt torque for clamp type connectors.
API Ring Gaskets
API ring gaskets type R, RX, and BX are used for
flanges and clamp type connectors. The R and RX gas-
kets are interchangeable and will fit ANSI flanges where
applicable (Standard B-16.20, and API 6A). Uses for the
different ring gaskets are shown in Figure 4-9.
Types RX and BX provide a pressure energized seal
but are not interchangeable.
It is not recommended to reuse BX150 through BX160
ring gaskets.
Types:
OVAL and OCTAGONAL. Designed for
API Ring Joint Gaskets, these match
standard and special grooves. K & W
produces a wide selection of custom-
designed and standard gaskets in
these styles.
BX and RX. Designed for extreme
pressure service to 15,000 psi required in
today's oilfield drilling and production,
these gaskets are pressure-actuated (the
higher the contained pressure, the tighter
the seal). The BX can be used only in API
6 BX flanges. The RX is interchangeable
with standard octagonal rings in
API 6B flanges.
COMBINATION. Designed for ring joints
in which the mating flanges have
different ring groove diameters.
Figure 4-9. Types of API ring gaskets as manufactured by K&W, Inc. (Courtesy of
K&W, Inc., a Standco Company.)
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