Types of Gasket
Types Of Gasket - Gasco Inc
Products - Metal Jacketed
Metal Jacketed and Metal Corrugated Gaskets. Metal jacketed gasket designs have serviced the industries' sealing demands for many years, delivering a cost-effective, quality seal with the advent of better gasket production techniques and materials; this trend is expected to continue for many years. Metal jacketed gaskets comprise a soft/non-asbestos material either partially or enveloped in a metallic sheath. This gasket arrangement allows for high strength, quality gasket seal suitable for use on standard flange assemblies, valves, pumps, heat exchangers, and other similar services.
Single-jacketed gaskets. The filter material in a metal jacket covers the inside and outside diameters of the gaskets and the contact surface on one side. Ideal for narrow circular or non-circular flanges with large diameters, as in boilers, compressors, pumps, and diesel and gasoline engines. It is not especially recommended for standard pipe flanges.
Overlapped Single Jacket. The filler is completely enclosed in a one-piece metal jacket. Ideal for applications like pump heads where a completely enclosed gasket is required because of temperatures encountered and narrow flange widths.
Double Jacketed Gaskets, the two-piece metal jacket completely encloses the filler material that covers the inside and outside diameters of the jacket and the contact surfaces on both sides. Ideal for applications in which temperatures as high as 1650 degrees F are encountered, like boilers, heat exchangers, and similar applications. Available in all standard pipe sizes. There is virtually no limit to gasket diameters or rib configuration that can be inserted.
Double Shell Gaskets. Two reversed wrap-around shells completely enclose a filler material. Overlapping metal shells provide superior flange support at inside and outside diameters and better resistance to high pressures and temperatures. Ideal for applications where a more rugged gasket than style 123 is required. There is virtually no limit to the gasket diameters or rib configuration that can be inserted.
Corrugated Double-Jacketed Gaskets. Similar to Style 123, except the two-piece metal jacket is made of corrugated rather than flat metal. More resilient than Style 123. Corrugated jacket forms multi-seals across the flange. Ideal for temperature cycling applications.
French-Type Gasket. A filler material is enclosed in a metal jacket covering the gasket's inside diameter and the contact surfaces on both sides. Ideal for small-diameter narrow flange circular and non-circular applications, such as vacuum seals and valve bonnets, where an unbroken metal surface across the full face is required.
Two-Piece French-Type Gasket. Similar to Style 130, except that the inside diameter of the gasket is protected by the overlapped construction of the two-piece metal jacket. Ideal for wide or irregular-shaped flanges in virtually any diameter. The minimum flange width is 1/4". It is less expensive than styles 130 or 123.
Two-Piece French-Type Gasket. Identical to Style 130, except that a three-piece construction is used for the metal jacket. Ideal for wide or irregular flanges in virtually any diameter.
Corrugated Metal Gaskets. The corrugations provide multiple seals across the face of the gasket. Designed for applications up to 500 psi. The pitch of the corrugations can be 1/8", 3/16", or 1/4". Three concentric corrugations on each side of the gasket are suggested. A flat area should be left on each side of the corrugations.
Single-Jacketed Gasket. A corrugated metal Gasket is enclosed in a flat metal jacket covering the inside and outside diameters of the gasket and the contact on one side.
Double Jacketed Corrugated Gasket. Corrugated Metal Gasket completely enclosed in a two-piece jacket that covers both inside and outside diameters of the gasket and the contact surface on both sides.
Products - Spiral Wounded
A spiral wound gasket is manufactured by spirally winding a pre-formed metal strip and filler on the outer periphery of metal winding mandrels. The winding mandrel's outside diameter forms the inner diameter of the gasket, and the lamination is continually wound until the outer diameter is attained.
The inner and outer diameters are reinforced with several plies of metal with no fillers. This gives greater stability and provides better compression and sealing characteristics. Then, the compressibility can be controlled by varying the ratio of the filler to the metal plies for a given gasket width density.
- Spiral wound gasket without inner and outer ring suitable for tongue and groove flange and narrow width flange.
- A spiral wound gasket with an outer ring accurately centres the gasket on a flange and acts as a compression stop.
- The spiral wound gasket has an inner and outer ring. The inner ring gives an additional compression limiting stop and provides a heat and corrosion barrier protecting the gasket winding and flange erosion.
- Spiral wound gasket with metal-jacketed partition bar welded to spiral wound gasket for use on the heat exchanger.
Available Material
- Metal Winding Strip - Stainless Steel Type 304, 304L, 316, 316L, 321, 347, 410, Inconel 600, Monel, Titanium, Incoloy 800.
- Filler Material - Compressed Asbestos, Flexible Graphite, PTFE, Ceramic.
- Guide Ring Material - Carbon Steel, S.S. Type 304, 304L, 316, 316L, 321, 347, 410, Inconel 600, Monel, Titanium, Incoloy 800.
| NOM PIPE SIZE | CLASS 150,300 400,600 | CLASS 900,1500 2500 | CLASS 150 | CLASS 300 | CLASS 400 | CLASS 600 | CLASS 900 | CLASS 1500 | CLASS 2500 | CLASS 150 | CLASS 300 | CLASS 400 | CLASS 600 | CLASS 900 | CLASS 1500 | CLASS 2500 |
| 1/4 | 22.2 | - | 12.7 | 12.7 | 12.7 | 12.7 | - | - | - | 44.5 | 44.5 | 44.5 | 44.5 | - | - | - |
| 1/2 | 31.8 | 31.8 | 19.1 | 19.1 | 19.1 | 19.1 | 19.1 | 19.1 | 19.1 | 47.8 | 54.1 | 54.1 | 54.1 | 63.5 | 63.5 | 69.9 |
| 3/4 | 39.6 | 39.6 | 25.4 | 25.4 | 25.4 | 25.4 | 25.4 | 25.4 | 25.4 | 57.2 | 66.8 | 66.8 | 66.8 | 69.9 | 69.9 | 76.2 |
| 1 | 47.8 | 47.8 | 31.8 | 31.8 | 31.8 | 31.8 | 31.8 | 31.8 | 31.8 | 66.8 | 73.2 | 73.2 | 73.2 | 79.5 | 79.5 | 85.9 |
| 1 1/4 | 60.5 | 60.5 | 47.8 | 47.8 | 47.8 | 47.8 | 39.6 | 39.6 | 39.6 | 76.2 | 82.6 | 82.6 | 82.6 | 88.9 | 88.9 | 104.9 |
| 1 1/2 | 69.9 | 69.9 | 54.1 | 54.1 | 54.1 | 54.1 | 47.8 | 47.8 | 47.8 | 85.9 | 95.3 | 95..3 | 95..3 | 98.6 | 98.6 | 117.6 |
| 2 | 85.9 | 85.9 | 69.9 | 69.9 | 69.9 | 69.9 | 58.7 | 58.7 | 58.7 | 104.9 | 111.3 | 111.3 | 111.3 | 143.0 | 143.0 | 146.1 |
| 2 1/2 | 98.6 | 98.6 | 82.6 | 82.6 | 82.6 | 82.6 | 69.9 | 69.9 | 69.9 | 124.0 | 130.3 | 130.3 | 130.3 | 165.1 | 165.1 | 168.4 |
| 3 | 120.7 | 120.7 | 101.6 | 101.6 | 101.6 | 101.6 | 95.3 | 92.2 | 92.2 | 136.7 | 149.4 | 149.9 | 149.4 | 168.4 | 174.8 | 196.9 |
| 3 1/2 | 133.4 | 133.4 | 114.3 | 114.3 | 104.8 | 104.8 | 104.8 | 104.8 | - | 161.9 | 165.1 | 161.9 | 161.9 | 190.5 | 187.3 | - |
| 4 | 149.4 | 149.4 | 127.0 | 127.0 | 127.7 | 127.7 | 127.7 | 117.6 | 117.6 | 174.8 | 181.1 | 177.8 | 193.8 | 206.5 | 209.6 | 235.0 |
| 4 1/2 | 165.1 | 165.1 | 139.7 | 139.7 | 134.9 | 134.9 | 134.9 | 134.9 | - | 177.8 | 196.9 | 193.7 | 209.6 | 238.1 | 231.8 | - |
| 5 | 177.8 | 177.8 | 155.7 | 155.7 | 147.6 | 147.6 | 147.6 | 143.0 | 143.0 | 196.9 | 215.9 | 212.9 | 241.3 | 247.7 | 254.0 | 279.4 |
| 6 | 209.6 | 209.6 | 182.6 | 182.6 | 174.8 | 174.8 | 174.8 | 171.5 | 171.5 | 222.3 | 251.0 | 247.7 | 266.7 | 289.1 | 282.7 | 317.5 |
| 8 | 263.7 | 257.3 | 233.4 | 233.4 | 225.6 | 225.6 | 222.3 | 215.9 | 215.9 | 279.4 | 308.1 | 304.8 | 320.8 | 358.9 | 352.6 | 387.4 |
| 10 | 317.5 | 311.2 | 287.3 | 287.3 | 274.6 | 274.6 | 276.4 | 266.7 | 270.0 | 339.9 | 362.0 | 358.9 | 400.1 | 435.1 | 435.1 | 476.3 |
| 12 | 374.7 | 368.3 | 339.9 | 339.9 | 327.2 | 327.2 | 323.9 | 323.9 | 317.5 | 409.7 | 422.4 | 419.1 | 457.2 | 498.6 | 520.7 | 549.4 |
| 14 | 406.4 | 400.1 | 371.6 | 371.6 | 362.0 | 362.0 | 355.6 | 362.0 | - | 450.9 | 485.9 | 482.6 | 492.3 | 520.7 | 577.9 | - |
| 16 | 463.6 | 457.2 | 422.4 | 422.4 | 412.8 | 412.8 | 412.8 | 406.4 | - | 514.4 | 539.8 | 536.7 | 565.2 | 574.8 | 641.4 | - |
| 18 | 527.1 | 520.7 | 474.7 | 474.7 | 469.9 | 469.9 | 463.6 | 463.6 | - | 549.4 | 596.9 | 593.9 | 612.9 | 638.3 | 704.9 | - |
| 20 | 577.9 | 571.5 | 525.5 | 525.5 | 520.7 | 520.7 | 520.7 | 514.4 | - | 606.6 | 654.0 | 647.7 | 682.8 | 698.5 | 755.7 | - |
| 24 | 685.8 | 679.5 | 628.7 | 628.7 | 628.7 | 628.7 | 628.7 | 616.0 | - | 717.6 | 774.7 | 768.4 | 790.7 | 838.2 | 901.7 | - |
Products - Ring Type Joint Gasket
The oil, gas, petrochemical, and offshore sectors are the primary users of ring-type joints. They are also commonly used on valves, pipework assemblies, and with some integrity vessel joints. Ring-type are used to sealing flanged connections subject to high pressures and temperatures. These precision-made solid metal gaskets form a metal-to-metal seal with the flanges. The gasket cross-sections are designed to concentrate the bolt load over a small area, producing high seating stress. The metal used for the gasket should always be softer than the metal used for the mating flanges. The high seating stress causes "plastic flow" of the gasket into the flange faces, creating a seal. The 'RX' and 'BX' gaskets are intended to be pressure triggered by the sealed media, enhancing the seal's performance as the system's internal pressure rises.
- 'R' series Ring Type Joints can contain pressure up to 10,000 PSI.
- RX and BX series Ring Type Joints can contain up to 20,000 PSI pressure.
- The gasket and flanges must be manufactured to precision dimensions, surface and hardness.