Ring Type Joints And Other Solid Metal Gaskets
 Solid
metal type gaskets are designed for use in high temperature and
high pressure environments. These gaskets must perform in very demanding
applications often in the presence of strong corrosive agents. Made
from solid metal and machine formed to the desired dimensions and
shape they are commonly found in refineries, oil and gas fields
and in chemical process plants. They are available in a variety
of materials. It is strongly recommended that the gasket metal be
softer than the flange material.
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RTJ
Type R Oval
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RTJ
Type R Octagonal
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Ring
Type Joint (RTJ) API Type R:
API
type R ring type joints come in two designs, oval and octagonal.
For use for presures up to 10 000 psi the dimensions are standardised
and the flanges are specially grooved to accept the RTJ. The oval
type R is designed to fit the round bottom groove but they may be
also fitted in the newer flat bottom groove design, The octagonal
type R RTJ design offers better sealing for the flat bottom grooved
flange. Type R API ring joint dimensions are covered by ANSI B.16.20
and API 6A. Sizes from R11 onwards of both oval and octagonal design
are available in soft iron, stainless steel and other metals.
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 API
Type RX RTJ:
The RX ring
joint differs from the type R in that its cross section shape is designed
to take advantage of the fluid pressure to achieve a seal. They are
used in API 6B flanges at pressures of up to 15 000 psi. |
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 API
Type BX RTJ:
The BX ring
joint is a square octagonal shape and designed to be used in API 6BX
flanges at pressures of up to 15 000 psi. |
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RTJ API Type R, RX, BX Dimension Tables
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 Lens
Type Gasket:
The lens
type gasket has a spherical cross section and resembles a lens.
It is a line contact seal for high presuure applications where contact
area is very small but gasket seating pressure is very high. Complete
drawings and material specifications are required for ordering.
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