Page 121 - GarlockFluidSealing2010

3
1
6
L
2”3-600
ASME B16.20
316L/PTFE
3
1
6
L
Ê
8 -
Á
Inner Ring Material
Stamped on Inner Ring
(when other than
Carbon Steel or PTFE)
Manufacturer’s Name
or Trademark
Winding Metal
and Filler Material
Manufactured to
ASME B16.20
Nominal Pipe Size
and Pressure Class
(standard gaskets only)
Outer Ring Material
(when other than
Carbon Steel)
Outer
(Centering)
Ring
Spiral
Winding
Inner
Ring
D-3
Spiral Wound Gaskets
Manufactured in Accordance
with ASME B16.20
Spiral wound gaskets—made with an alternating
combination of formed metal wire and soft fller ma-
terials—form a very effective seal when compressed
between two fanges. A v-shaped crown centered in
the metal strip acts as a spring, giving gaskets greater
resiliency under varying conditions. Filler and wire mate-
rial can be changed to accommodate different chemical
compatibility requirements. Fire safety can be assured
by choosing fexible graphite as the fller material. If the
load available to compress a gasket is limited, gasket
construction and dimensions can be altered to provide
an effective seal.
A spiral wound gasket may include a centering ring,
an inner ring or both. The outer centering ring centers
the gasket within the fange and acts as a compression
limiter, while the inner ring provides additional radial
strength. The inner ring also reduces fange erosion and
protects the sealing element.
Resiliency and strength make spiral wound gas-
kets an ideal choice under a variety of conditions and
applications. Widely used throughout refneries and
chemical processing plants, spiral wound gaskets are
also effective for power generation, pulp and paper,
aerospace, and a variety of valve and specialty applica-
tions.
The spiral wound gasket industry is currently
adapting to a change in the specifcation covering spiral
wound gaskets. Previously API 601, the new specifca-
tion is ASME B16.20. These specifcations are very
similar. Garlock metallic gaskets are manufactured in
accordance with the guidelines set forth in the ASME
B16.20 specifcations.
Gasket Identifcation Markings
Required by ASME B16.20