Material: | Stainless Steel Inner and Outer Ring |
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Application: | Flanges |
Type: | Pipeline Seal |
Customization: |
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Currency: | US$ |
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PTFE Coated ASME B16.20 Spiral Wound Gasket Made of SS304/SS316/SS321/SS347/SS904/UNS S32750
PTFE coated ASME B16.20 spiral wound gaskets are a type of gasket that combines the strength and resilience of a metal spiral wound gasket with the non-stick and chemical-resistant properties of PTFE (polytetrafluoroethylene). These gaskets are commonly used in applications where a high level of chemical resistance is required, such as in the chemical and petrochemical industries.
The ASME B16.20 standard specifies the dimensions, tolerances, and materials for spiral wound gaskets used in flanged connections in piping systems. This standard applies to gaskets with nominal diameters from 15 mm to 3,000 mm, and pressures up to Class 2500.
The PTFE coating on these gaskets provides a smooth, non-stick surface that resists chemical attack and prevents gasket sticking, even under extreme conditions. PTFE is highly resistant to a wide range of chemicals, including acids, alkalis, and organic solvents, making it an ideal choice for use in harsh chemical environments.
In addition to its chemical resistance, PTFE also has excellent non-stick properties, which prevent the gasket from sticking to the flange surface. This is especially important in applications where the gasket may be exposed to high temperatures or high pressures, which can cause the gasket to deform or stick to the flange surface, compromising the seal.
The metal winding in these gaskets provides the necessary structural support to withstand high pressures and maintain the integrity of the gasket. The metal strip is typically made of stainless steel, which provides excellent corrosion resistance and can withstand high temperatures.
PTFE coated ASME B16.20 spiral wound gaskets are designed to conform to ASME B16.5 and B16.47 flanges, ensuring a secure and reliable seal. They are available in a range of sizes and materials, including PTFE, stainless steel, and other metals, to suit a variety of applications.
In conclusion, PTFE coated ASME B16.20 spiral wound gaskets are a highly effective sealing solution for applications where chemical resistance and non-stick properties are required. They combine the strength and resilience of a metal spiral wound gasket with the chemical resistance and non-stick properties of PTFE, providing a reliable and long-lasting seal in even the most demanding applications.
Basic Type
Basic construction type, inner and outer diameters are reinforced with several piles of metal without filler to give greater stability and better compression characteristics. - Suitable for tongue and groove, male and female or grooved to flat face flange assemblies.
Inner Ring Type
Solid inner metal ring acts as a compression stopper. To prevent accumulation of solids, reduce turbulent flow of process fluids and minimize erosion, damages of gasket between flange bore and the inside diameter, the annular space is filled up by solid inner metal ring. - Suitable for male and female pipe flanges.
Outer Ring Type
Solid outer ring accurately locates the gasket on the flange face to give the additional radial strength to prevent the gasket blowout and acts as a compression limiter. In case of installing the outer ring, it is very easy to install the gasket to flange face because the end of outer ring will touch at bolts - Suitable for use with flat face and raised face flanges. For class 900 and above an internal ring is recommended.
Inner & Outer Rings Type
A inner ring and outer ring type gasket will give an additional compression limiting stopper for gasket inner and outer side. It will prevent the corrosions on flange face at annular space. - Suitable for use with flat face and raised face flanges and specified for high pressure / temperature service - Class 900 and above or where corrosive or toxic media are present.
Typical Applications
Pipe, valve, pump, thermal exchange, condensing tower, plain hole and man hole of flange, etc. Petrochemical, chemical, mechanical manufacturer, power station, metallurgy, shipbuilding, medical and pharmaceutical unclear power station and navigation, etc.
Spiral Wound gaskets, ASME B16.20 Metal Gasket,Marking
Ring & Strip Materials
Minimum | Maximum | GuideRing Color Code | ||||
Material | F | C | F | C | Abberviation | |
SS 304 | -320 | -195 | 1400 | 760 | 304 | Yellow |
SS 316L | -150 | -100 | 1400 | 760 | 316L | Green |
SS 347L | -150 | -100 | 1400 | 760 | 317L | Maroon |
SS 321 | -320 | -195 | 1400 | 760 | 321 | Turquoise |
SS347 | -320 | -195 | 1700 | 925 | 347 | Blue |
Carbon Steel | -40 | -40 | 1000 | 540 | CRS | Silver |
Alloy 20 | -300 | -185 | 1400 | 760 | A-20 | Black |
Hastelloy B3 | -300 | -185 | 2000 | 1090 | HASTB | Brown |
Hastelloy C276 | -300 | -185 | 2000 | 1090 | HASTC | Belge |
Incoloy 800 | -150 | -100 | 1600 | 870 | IN 800 | White |
Incoloy 825 | -150 | -100 | 1600 | 870 | IN 825 | White |
Inconel 600 | -150 | -100 | 2000 | 1090 | INC 600 | Gold |
Inconel 625 | -150 | -100 | 2000 | 1090 | INCO 625 | Gold |
Inconel X750 | -150 | -100 | 2000 | 1090 | INX | No Color |
Monel 400 | -200 | -130 | 1500 | 820 | MON | Orange |
Nickel 200 | -320 | -195 | 1400 | 760 | NI | Red |
Titanium | -320 | -195 | 2000 | 1090 | TI | Puple |
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