Everything You Need To Know About Spiral Wound Gasket
The most common spiral wound gasket used in industrial settings with a wide variety of temperature and pressure conditions is a spiral wound gasket. They are frequently employed to prevent leaks at flange joints in the oil and gas, chemical, petrochemical, electrical, and food industries. Flexitallic designed the spiral-wrapped gasket in 1912 to accommodate high temperature and pressure changes in US refinery operations.
Spirally wound gaskets are commonly utilized in a wide range of applications.
High-temperature service applications
Applications using high pressure
Corrosion-causing fluids
Inflammable fluids
Hydrogen
Spiral Wound Gasket Major Components
A semi-metallic gasket is a spiral wound gasket. It is made of a spirally coiled v-shaped metallic and non-metallic filler material. A spirally coiled gasket is made up of three major components. These are their names:
Outer Ring: A spiral wound gasket's outer ring, also known as a guide ring or centering ring, is frequently made of carbon steel. The major function of this device is to center the gasket when it is fitted into a bolted flange joint.
Inner Ring: The inner ring of a spiral wound gasket is necessary because it prevents the windings from bending within the pipe. When a gasket bends, parts of it are drawn into the pipe and eventually travel through the piping system, becoming stuck or wrapped around something. Inner rings prevent this disease and assist to lessen the likelihood of it occurring.
Sealing Element: The sealing element is the component of the spirally coiled gasket that forms a tight seal to prevent leaking. Windings and filler material are both included in the sealing component. Spirally coiled gaskets are often manufactured using a flexible graphite filler material that can resist high temperatures. Using graphite as a filler material also helps the gasket resist flange deformation and joint displacement. Another frequent filler material is PTFE (Polytetrafluoroethylene). PTFE, on the other hand, is not suitable for use in high-temperature situations. The most frequent winding materials are stainless steel and Monel.
Spiral Wound Gasket Markings
Various markings on the gasket differentiate spiral wound gaskets. Each mark gives precise information about the spiral wound gasket standard, which aids in the gasket selection process.
The spiral-wrapped gasket's markings offer the following critical information:
Design Code or Standard: The code used to design and manufacture the spiral-wrapped gasket is shown. This gasket displays the ASME B16.20 standard.
Spiral Wound Gasket Information from the Manufacturer: By verifying the manufacturer's name on the gasket, the manufacturer may be easily determined.
Winding and Filling Material: The spiral wound gasket specifies the winding and filler materials.
Diameter and pressure class: Diameter and pressure class marks on the gasket define the size of the spiral wound gasket as well as the load that the spiral wound gasket can bear. Spiral wound gasket pressure classes are commonly 150, 300, 400, 600, 900, 1500, and 2500. As the pressure class grows, so does the spiral-wrapped gasket's capacity to withstand pressure.
Spiral Wound Gasket Thickness
Spirally coiled gaskets are typically between 3.2 mm and 4.5 mm thick. A thickness of 5.5 mm to 7 mm is suggested for particularly large diameters. The market provides a diverse range of spiral-wrapped gasket thicknesses ranging from 1.6 mm to 7.2 mm.
Spiral Wound Gasket Pressure Ratings
There are seven pressure rating classes for spiral-wrapped gaskets. They are divided into 150, 300, 400, 600, 900, 1500, and 2500 categories. The size of spiral wound gaskets is determined by the design criteria. ASME B16.20, for example, has spiral wound gasket sizing tables in a tabular format that includes all necessary parameters based on pressure class and pipe size.
