How Many Types Of Ring Joint Gaskets Are There

  •   Metal gasket, ring joint gasket

      Ring Joint Gaskets Manufacturer supplies various ring joint gaskets. RTJ standard size washers are manufactured according to API-6A and ASME B16.20 specifications. We have obtained permission from the American Petroleum Institute (API).

      Oval shape (type 377) and octagonal shape (type 388)

      There are two basic types of API ring joint gaskets, oval cross-section (type 377) and octagonal cross-section (type 388). These basic shapes can be used at pressures up to 10,000 psi. The dimensions are standardized and require specially grooved flanges. The sealing efficiency of the octagonal cross-section is higher than that of the ellipse and will be the preferred gasket. However, only elliptical cross-sections can be used in the old circular bottom grooves. Newer flat-bottomed groove designs will accept oval or octagonal cross-sections. The sealing surface on the groove of the ring joint must be smoothly trimmed to 63 microinches, and there should be no undesirable bumps, tools, or chatter marks. When pressure is applied, they are sealed by initial line contact or edge action.

      BX (Type 390)

      The BX ring gasket is different from the standard oval or octagonal shape because its cross-section is square and each corner is tapered. They can only be used in API 6BX flanges. BX is used at pressures up to 15,000 psi. Non-Asbestos Gaskets Factory

      The standard size is stored in mild steel 304 and 316.

      RX (Type 391)

      The shape of the RX ring gasket is similar to a standard octagonal ring joint gasket, but its cross-section is designed to use the fluid pressure contained to achieve sealing. They are all made in accordance with API 6A and can be interchanged with standard octagonal rings for API 6B flange oilfield drilling and production applications. RX is used at pressures up to 15,000 psi. Standard sizes are stored in mild steel 304 and 316.

      SRX and SBX

      API 17D-compliant SRX and SBX gaskets for underwater wellheads and tree equipment have been vented to prevent pressure lock when connecting underwater. They have the same dimensions as the RX and BX ring gaskets with the same number markings, and they will fit the same corresponding connectors. "S" means that these gaskets have cross-drilled holes because the retention of fluid in the annular groove will interfere with the correct construction of the underwater (seabed). Through the vent hole, any water remaining between the bottom of the ring groove and the sealing area of ​​the gasket may escape into the device ID hole. The material of each specification is defined as a corrosion-resistant alloy.

      Type 377R (Rubber coated ring)

      Type 377R is a rubber-coated oval ring gasket (usually made of steel), used for pressure testing to minimize damage to the flange. The rubber contacts provide an additional seal while protecting the flange surface.

      Type 377T (transition ring)

      The 377T combination ring combines two different sizes with the same pitch diameter, allowing flanges of different sizes to be bolted.

      Bridgman (Type 393)

      Bridgman gaskets are pressure-activated gaskets used on pressure vessel heads and valve covers with pressures of 1500 psi and above. The cross-section of the gasket should be such that the internal pressure acting on the ring forces it against the receiving surface, thereby forming a self-energizing seal. Bridgeman gaskets are usually silver or lead plated to provide a softer surface and minimize the force required to flow the gasket metal into the flange surface.

      Delta (Type 392)

      The triangular gasket is a pressure-actuated gasket, mainly used for pressure vessels and valve covers under extremely high pressures exceeding 5000 psi. As with the lens gasket, complete drawings and material specifications must be provided. When pressure tends to separate the flanges, the internal pressure forces the gasket material to expand. When using this type of gasket, an extremely smooth surface finish of 63 inches or more is required.

      Lens (Type 394)

      A lens gasket is a pipeline contact seal used in high-pressure piping systems and pressure vessel covers. The cross-section of the lens is a spherical gasket surface, which requires special processing on the flange. These washers will be seated with a small bolt load because the contact area is very small and the seat pressure of the washers is high. Generally, the gasket material should be softer than the flange. When ordering lens gaskets, complete drawings and material specifications must be provided.