Everything You Need to Know About Flexitallic Spiral Wound Gaskets

The most popular type of metallic gasket used in industrial applications involving a variety of pressures and temperatures is a spiral wound gasket. They are widely used to stop leaks at flange joints in the gas and oil, chemical, petrochemical, food, and industries. Flexitallic Spiral wound gasket was invented by Flexitallic design in 1912 to support operations in US refineries with extreme temperature and pressure swings.

Flexitallic Spiral Wound Gaskets are used for:

Flammable fuels

– High-pressure applications

– High-temperature service applications

– Corrosive fluids

– and hydrogen.

Marking Provide on Spiral Wound Gaskets Are:

Different marks on the gasket are used to identify spiral wound gaskets. When choosing a gasket, each marking briefly describes the spiral wound gasket standard.

➤ Name of Manufactures:

Looking at the manufacturer’s name written on the gasket, one may quickly determine who made it.

➤ Code or Design Standards:

The coding used to develop and produce the spiral coiled gasket is prominently marked. It is simple to locate the ASME B16.20 standard.

➤ Filler And Winding Material:

The spiral wound gasket clearly states the ingredients for the winding and filler. Different gasket colors also reveal a great deal about the materials.

➤ Pressure And Diameter Class:

The Diameter and Pressure Class label on the gasket indicates the size of the gasket and the load the spiral wound gasket can support. For spiral wound gaskets, the typical pressure classes are 150, 300, 400, 600, 900, 1500, and 2500. The Flexitallic spiral wound gasket’s capacity to tolerate pressure rises with an increase in pressure class.

Types of SPiral Gaskets

1. Style CG:

This particular spiral wound gasket consists of an exterior metal ring and a sealing component. The outer ring guarantees optimum sealing performance by preventing excessive. The ring aids in positioning the gasket on the flange facing that mat. Flat-faced and raised flanged connections can employ Style CG gaskets. They are frequently employed in light to medium service situations.

2. Style CGI:

In addition to the outer metal ring, this spiral wound gasket type also has an inside metal ring. The CGI-style gasket’s inner metal ring limits the sealing element’s external and internal diameters. It functions as an additional compression stop and stops the sealing element’s inner buckling. The sealing element is simultaneously protected from media, and heat is kept from eroding by the physical barrier that is formed between it and the process stream. For use on flat and raised-faced flanged moderate connections to deliver service requirements, spiral wound gaskets of type CGI are advised.

3. Style R:

Metallic plies are used at the beginning and end of the winding process to create Style R gaskets, which have a sealing feature. This increases the type of spiral wound gasket’s stability and sealing capabilities. Flat to groove, female and male, and tongue and flanged groove connections all employ Style R gaskets.

4. Style RIR:

RIR style is made up of an inner metal ring and a sealing component. The inner ring acts as a compression stop and as a physical partition separating the sealing element from the media stream. Moreover, the inner ring is specifically made to lessen the turbulent flow. By doing this, you can decrease flange erosion and stop debris from accumulating in the area between the pipe bore and the gasket’s internal diameter. Both female and male flanged connections can use these.

Specification of Spiral Gasket

  • Flange standard
  • Nominal pipe size
  • Gasket style required
  • Design and operating temperature
  • Manufacturing standard and gasket design 
  • Fluid service
  • Pressure rating class for connecting flange
  • Inner ring, outer ring, and connecting flange

With the help of this post, you now have a better understanding of the Flexitallic spiral wound gasket.