METALLIC GASKETS & RING TYPE JOINTS
Metallic ring type joints (RTJ’s) are heavy duty, high pressure gaskets largely
used in offshore and refining petrochemical applications. The precision engineered solid
metal gasket provides an excellent mechanical joint, when used in conjunction with
precision machined flanges of the appropriate material and hardness; the gasket material
is typically about 30 Brinell less than the flange material. Ring joints can be
manufactured to API 6A, ASME B16.20 and BS7076pt 2 standards and to customers’ own
specifications.:
| Type | Nominal Pipe Size | Class Ratings |
| Type R Oval & Octaganal | 1 /2” to 24” 26” to 36” 1.1/2” to 20” |
150 to 2500 ASME B16.20 300 to 900 ASME B16.20 Series A API 6A |
| Type RX | 1 /2” to 24” 26” to 36” | 720 to 5000 ASME b16.20 300 to 900 ASME B16.20 Series A API 6A |
| Type BX | 1 1 /2” to 20” 1 11 /16” to 21 1 /4” | 5000 to 20000 ASME B16.20 |
The type R oval configuration is the original ring joint
design and was followed by the type R octagonal which
offers more specific contact sealing areas. Both types can be used with flanges having
the standard ring joint flat bottom groove and hold off flanges by a specified amount,
relying entirely on correctly applied initial bolt load for their proper operation in
service.
Metallic gaskets of varying designs and materials are available from SEP on short
lead times. These gaskets or seals can be as diverse as, simple press cut sof tiron
washers, tight tolerance compressor head rings in aluminium to exoticcopper valve
seals.
