 |
Spiral wound gaskets for flanged connections |
The many advantages of spiral wound (SPW) gaskets are found in conventional and nuclear power plants, chemical and petrochemical plants, refineries, equipment construction, boiler construction, high-pressure pipes with flange connections and in aerospace. Different variants of this gasket for a wide range of applications are available.
Spiral wound gaskets are characterised by a high degree of precision. This makes it possible to integrate a filler material while winding a profiled metal strip.
The high quality of spiral wound gaskets is also achieved by the high quality of the expanded Graphite or PTFE. In this case, the V-profile metal strip is manufactured from different metal materials, with the V-shaped cross-section that brings about the improvement in the resilience of the gasket.
Spiral wound gaskets come with and without inner and outer ring. The texture is designed to allow universal application, and substances such as water, , steam, acids and gases can be easily sealed. Resistant variants of spiral wound gaskets can also be produced for particularly chemical products.
The secret
The key of the spiral wound gasket is a wound steel strip in a V-shape. Under pressure, it presses against the flanges and simultaneously compresses the filler material.
Profiles
spiral wound gasket without inner and outer ring for force, groove and spring applications.
spiral wound gasket with inner ring, for male and female flanges.
spiral wound gasket with centring ring, for flanges with and without sealing strip.
spiral wound gasket with centring ring and inner ring, for flange joints with and without sealing strip.
Type 4 Profile
The inner ring acts as an additional compression stop and prevents internal deformation of the sealing element. It also forms a physical barrier between the sealing element and the process flow, protecting it from heat and media and preventing erosion. The rings are suitable for use on raised and flat faced flanged connections. The material must be the same or better as the pipework, as it comes into contact with the medium.
The outer ring assists in positioning the gasket on the flange surfaces and prevents excessive compression of the sealing element, thereby guaranteeing optimal sealing performance. The gaskets are suitable for use on raised and flat faced flanged connections and for use in mild to moderate service conditions. The material does not have to be the same as the piping and is typically made of carbon steel. However, many companies choose to make the outer ring from the same material as the pipes as well.
Remark(s) of the Author...
It is true that spiral wound gaskets are suitable for use on flange connections with raised and flat surfaces.
However, with flange connections with a flat surface, problems can arise if the flanges are thin, which is normal for FF (flat face) flanges, as these are usually used in low pressure applications.
There is then a risk that the flanges will deform during tightening and that a leak free connection cannot be made.
I am sure that an experienced pipe fitter will definitely solve this minor issue.
Marking of Spiral Wound Gaskets
the
inventor of the spiral wound gasket
Flexitallic was born from the revolutionary invention of the spiral gasket in Trenton,
New Jersey. It was developed for use in marine steam engines that were notorious for their low efficiency
and poor power transmission to speed. Suddenly, the use of the Spiral Wound Gasket unlocked the energy
of these engines and increased the efficiency and speed of marine vessels.
Since its foundation in 1912, Flexitallic continues to be the sealing company that industry innovators
look to when choosing products and materials to develop and implement new technologies.
Related Post(s)
Dimensions Spiral Wound Gaskets ASME B16.20 used with RF flanges ASME B16.5...