SS316 ASME B16.20 Octagonal Ring Joint Gasket,SS304,SS321, 347 Ring Type Joint Gasket
We are the professional manufacturer and supplier of SS316 ASME B16.20 Octagonal Ring Joint Gasket,SS304,SS321, 347 Ring Type Joint Gasket
We Manufacture and supply high quality Ring joint Gaskets for high pressure and temperature service conditions. These gaskets are widely used in Refineries, Petrochemical Industries, Oil drilling well head equipments, Pressure Vessels, valves, Christmas Tree valves and Pipe lines. Ring joints Gasket are strictly manufactured as per API-6A and ASME B16.20 specification.
‘R’ Type
octagonal/oval
–NB1/2″ to 24″ Class Rating 150 to 2500 ASME B16.20
–NB26″ to 36″ Class 300 to 900 ASME B16.20 Series A
–NB1/2″ to 20″ Class API 6A
Ring joint gasket is machined from solid metal in a variety of shapes according to API 6A & ASME B16.20 standards,it’s designed for high pressure ,high temperature or highly corrosive applications by selecting the most suitable material and shape. It is designed to with stand exceptionally high assembly loads over a small area, thus producing high seating stresses
Ring joint gaskets are metallic sealing ring suitable for high pressure and high temperature applications. They are manufactured in two kinds of cross section: octagonal and oval accordance.
Ring joint gasket are used in connection with RTJ flange, generates a strong seal between two mating flanges. When the flanges are fixed by bolts, ring joint gasket is squeezed into the groove of the flange, forming a tight seal between the mating flanges. In order to avoid destruction of the flanges, the material of the ring joint gaskets must be softer than the material of the flanges.
Type&Material
| Type | Material | Hardness(HB) | Temperature(ºC) |
| R-oval | Soft Iron | 90 | 530 |
| Low Carbon Steel | 120 | 530 | |
| SS304(18Cr-8Ni ) | 160 | 750 | |
| R-octagonal | SS316(16Cr-12Ni-2Mo) | 160 | 800 |
| SS347(18Cr-10Ni-Nb) | 160 | 800 | |
| SS410(13Cr Steel) | 170 | 700 | |
| RX | SS321(18Cr-10Ni-Ti) | 160 | 800 |
| Inconel | 140 | 1100 | |
| Titanium | 140 | 800 | |
| BX | Hastelloy | 130 | 800 |
| Nickel | 120 | 760 | |
| Copper | 50 | 400 | |
| Plain | Aluminum | 30 | 300 |
| Monel | 130 | 800 | |
| Other material |
Basic Types of Ring Joint Gaskets
Ring joint gaskets are manufactured in three types: Style R(including R octagonal gasket and R oval ring gasket), Style RX and Style BX. Style SRX and Style SBX are respectively as the adaptation version of Style RX and Style BX.
Style R Gasket
Style R gaskets are divided into R octagonal gasket and R oval ring gasket according to the different cross section. Style R gasket is used for pressures up to 5,000 PSI. The ring gasket is regarded as semi-pressure energized ring gasket. They are manufactured in API 6A and ASME B16.20 to suit API 6B and ASME/ANSI B16.5 flanges. Style R Ring Joint gaskets are manufactured in accordance with all relevant standards to suit the following flange designations:
API 6A > ASME / ANSI B16.5 > MSS SP44 ( ASME 16.47 SERIES A ) > BS 1560
R octagonal gasket is designed with octagonal-shaped section. The average diameter of the R octagonal gasket is slightly larger than the average diameter of the gasket groove. The angle between ring gasket and bevel face of gasket groove is around 23°. The octagonal shape fits only the modern flat bottom groove flange.
R oval ring gasket is manufactured in oval-shaped section. The oval ring fits the round and flat bottom ring groove flange. R octagonal gasket and R oval ring gasket in a similar function : they seal by an initial line contact or a edging action as the compressive forces are applied. However, the R oval ring gasket has a lower sealing efficiency than the octagonal ’s.
Style RX Gasket
Style RX gaskets comply with the standard of API 6A and ASME B16.20 to suit API 6B and ASME/ANSI B16.5 flanges. Style RX Gasket, as one special kind of octagonal gaskets is developed and improved in the basis of style R gasket. It has good sealing as the contact between gasket and the ring joint faces, especially the outside face, and is pressed tightly to keep good sealing performance. Style RX gasket is used for pressures up to 5,000 PSI. RX Ring Joint Gasket is one kind of pressure energized ring gaskets.
Style BX Gasket
Style BX, as one special kind of octagonal gaskets, is manufactured in accordance with API 6A and are suitable for use in high pressure API 6BX flanges. Style BX is designed for use on pressures up to 20,000 psi. All BX sizes have a pressure relief hole to equalise pressure across sealing faces. BX ring type joint gasket is one kind of pressure energized ring gaskets.
Type SRX and SBX Gasket
Type SRX and SBX gaskets are the same design as the Type RX and BX gaskets. They are manufactured to API 17D and apply for Subsea Wellhead and Tree Equipment. The “S” indicates these gaskets have cross-drilled holes to assure that any liquid trapped behind the ring gasket on either side will flow to the I.D. bore. SRX Ring Gaskets usually be designed in 6BX and/or 17D RTJ flanges under water.
Standards
Ring Joint Gaskets are manufactured according to any standard and non-standard sizes, including the standards of API 6A, API 17D, ASME B16.20, DIN 2693-67, JPI-7S-23-72 and other standards to suit ASME B16.5, ASME B16.47 Series A & Series B, API 6A Type 6B and 6BX flanges.
| Common Materials | |||
|---|---|---|---|
| Material | Brinell Hardness | Temperature Limitations | Identification |
| Soft Iron | 90 | -60 to +400 °C | D |
| Low carbon steel | 120 | -40 to +500°C | S |
| 4%-6% Cr ½% Mo:F5 | 130 | -125 to +500°C | F5 |
| Stainless steel 304/304L | 160 | -250 to +650°C | S304 or 304L |
| Stainless steel 316/316L | 160 | -196 to +800°C | S316 or 316L |
| Stainless steel 321 | 160 | -250 to +870°C | S321 |
| Stainless steel 347 | 160 | -250 to +870°C | S347 |
| Stainless steel 410 | 170 | -20 to +500°C | S410 |
| Inconel 625 | – | 1000°C | 625 |
| Incoloy 825 | – | 1000°C | 825 |
| Hastelloy C-276 | – | 1000°C | C-276 |
| Duplex | – | 800°C | S31803 |
| Titanium | – | 540°C | TI |
The sealing surfaces on the ring joint grooves must be smoothly finished to 63 Microinches and be free of objectionable ridges, tool or chatter marks.
The following Ring Type Joint styles are available:
Ring joint gasketsTolerances (Inches)
1.”A” Width of ring: +/-0.008
2.”B” “H” Height of ring: +/-0.020
3.”P” Average pitch diameter of ring: +/-0.007
Special Alloy Gasket
| Material |
| Hastelloy B, C, C-22, C276, D, |
| Incolloy 800, 825 |
| Inconel 600, 601, 625 |
| Monel 400,Monel K500 |
