Ring Joint Gasket
Ring joint gaskets are metallic waling rings suitable for high pressure and high temperature applications and are fitted in ring groove type flanges. They are widely used in the Oil / Petrochemical industry and in valves and pipe work. Choice of material may be determined to suit higher temperatures and aggres- sive media. They comply with ASME B16.20 standards and API spec 6A. Ring type Joint Gaskets are designed to seal by “initial line contact” or wedging action be- tween the mating flange and the gasket. By applying pressure on the seal inter- face through bolt force, the softer metal of the gasket flows into the micro fine structure of the harder flange material, creating J very tight and efficient seal.
Dimensions
| Type | Nominal Pipe Size | Class Rating |
|---|---|---|
| R- Series Oval & Octagonal Ring no R11 to R105 | 1/2 ” -24″ | 150 TO 2500 ASM E B 16.20 |
| 26″ -36″ | 300 TO 900 ASM E B 16.20 Series A | |
| 1 1/2″ -20″ | API 6A | |
| R- Series Available Ring no RX 20 to RX 215 | 1/2 ” -24″ | 750 TO 5000 ASME B 16.20 |
| 26″ -36″ | 300 TO 900 ASM E B 16.20 Series A | |
| 1 1/2″ -20″ | API 6A | |
| BX- Series Available Ring no BX 1 50 to bX 172 | 1 11/16″- 2114” | 5000 to 20000 ASME B 16.20 |
Cross Section
Oval Type
The contact face is in oval shape. It provides a high reliability seal. These gaskets comply with ASME B-16.20.
Octagonal Type
More accurate in dimensions and surface finish than oval type be- cause it consists of straight surfaces only. A Higher torque load is re- quired to flow the gasket material into imperfections of the flange facings. These gaskets comply with ASME B-16.20.
Bx Type
Designed to API 6A. Interchangeable with the oval and octagonal series of identical reference numbers, and used in the same flange grooves.
Rx Type
Designed to API 6A for use with grooved flanges for special appli- cations involving high pressures from 5,000 to 15,000 psi
Advantage
The metal ring joint gaskets have been designed to withstand ex- ceptionally high assembly loads over a small area, thus producing high seating stress. The octagonal cross section has a higher sealing efficiency than the oval and would be the preferred gasket.
