What Are The Different Types Of Spiral Wound Gaskets Used? - Trim Engineering Services

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Spiral wound gaskets are made by spirally winding
a metallic material and filler material over an
inner ring made of special steel. Generally, the
metallic material is wound outwards in a
circular spiral, and the filler material is wound
in the same manner starting from the opposite
side thus resulting in alternating layers of
filler and metal. The metal gives structural
support, while the filler material acts as a
sealing element. Trim Engineering Services are
one of the leading spiral wound gasket
manufacturers in India, who not only manufacture
spiral wound, but also metallic, and non-metallic
gaskets with the best quality materials and
processes.

• What are spiral wound gaskets made of?
• The materials used for the metal and filler are
  decided upon depending on the chemical
  compatibility requirements that need to be
  fulfilled in a particular application. The
  general materials that are used include
• Metals like stainless steel, mondel, nickel,
  inconel, incoloy, and hastalloy
• Filler materials like asbestos, graphite,
  ceramic, PTFE, and aluminum
• Inner ring materials like stainless steel, carbon
  steel, titanium, monel, nickel, inconel,
  incoloy, and hastalloy
• Where are spiral wound gaskets used?
• Spiral wound gaskets are used under high
  temperature and pressure conditions
  temperatures up to 2000F, and pressures from
  vacuum to the standard 2500 psi flange

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ratings. Moreover, these gaskets are highly
resilient and flexible, which help the seal to
recover and maintain itself under variable
working conditions. These properties have helped
in using such gaskets for a variety of
applications like valves, pressure vessels, heat
exchangers, condensers, pipelines, towers, power
generation industries, ships, and man- holes and
hand-holes. What are the different types of
spiral wound gaskets available? There are many
different kinds of spiral wound gaskets
available, some of the most commonly used ones
as below. Type R These gaskets have their
inner and outer diameters reinforced with only
metal without any filler material, thus
providing greater stability and better
compression. They are used in tongue and groove,
male and female, and grooved to flat face flange
assemblies. Type RIR These gaskets have a
solid inner metal ring as a compression stop to
fill the annular space between the flange bore
and inner diameter. This prevents accumulation of
solids, minimizes flange face erosion, and
reduces process fluids turbulent flow of process
fluids. These gaskets are suitable for male and
female pipe flanges. Type CG These gaskets
have an external ring that centers gaskets on
flange face for more radial strength, and acts
as a compression stop to prevent gasket blowout.
They are used for both flat face and raised face
flanges. Type CGI These gaskets are CG styled
gaskets fitted with an internal ring that
provides additional compression limiting stop,
while providing a heat and corrosion barrier,
thus preventing flange erosion. They are
suitable for use in both flat and raised face
flanges, where corrosive and toxic media are
present. Type CG-RJ These gaskets are CG types
with an outer ring that covers ring joint grooves
and prevents the spiral wound portion from
entering the groove. They are used only as a
maintenance repair item. Type HE These gaskets
are spiral wound on the outer portion, and are
single or double jacketed for pass bar, fastened
to the ID of the spiral wound portion. The HE
stands for Heat Exchanger. Type HE-CG These
gaskets are Heat Exchangers with an outer guide
ring and spiral wound primary seal. The outer
ring acts as a centering guide and provides
adiitonal radial strength to prevent gasket
blowout. It acts as a compression stop, and has
excellent resiliency and sealing quality. Type
625 These gaskets are similar to the basic
R-type gaskets with the thickness being 0.0625.
They are used for high pressure sealing in space
restricted applications.
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