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Spiral Wound Gaskets are semi metallic products designed for high pressure
and temperature applications. A variety of forms of the gasket are available
and these can be manufactured in various materials or sizes to suit your
With over thousands of satisfied customers who have procured SHASON spiral
wound gaskets, we are confident that we can meet all your service
HOW TO ORDER:
Please specify the following when ordering Spiral
- Type of Spiral Wound Gasket required
- Standard of the gasket (flange standard)
- Nominal size and pressure class
- Gasket Thickness
- - Inner Ring
- Metal winding
- Outer Ring
The sealing element of the spiral wound gasket consists
of a V-shaped metal strip spirally wound in combination with a soft sealing
material filler. The metal strip provides outstanding resilience, while the
flexible sealing filler guarantees excellent sealing.
Due to this combination of materials, the spiral wound gasket is suitable
for sealing under severely fluctuating temperature and pressure conditions.
Depending on the application the spiral wound gasket can be specified with
outer and/or inner rings
- Spiral Wound Gaskets are suitable for use across a wide range
gasket stress range
- Spiral Wound Gaskets can be used to seal fluid pressures up to
400 bar and from cryogenic temperatures up to 1000oC
- Spiral Wound Gaskets are robust and simple to install
- The outer guide ring simplifies assembly and prevents blow-out of
- By combining different winding materials and metals, the gasket
can be tailored to suit a wide variety of operating conditions
Guide Rings and Material Selection
Benefits of Center Ring:
The spiral wound gasket outer centering ring provides
the following benefits:
- Optimum location between the bolts
- Protection of the spiral wound element
- Additional security against gasket blow-out
- Acts as compression limiter preventing overloading and over
compression of the spiral wound element
- Prevents radial-flow of soft fillers, 1such as PTFE.
For these reasons it is preferable to use spiral wound gaskets with outer
centering rings. The outer ring is marked with nominal size, pressure class,
standard and materials.
Benefits of the Inner Ring:
The spiral gasket inner ring provides the following
- Prevents radial-flow of soft fillers, such as PTFE + Graphite
- Reduces turbulence-minimising flow resistance
- Acts as a heat shield when the spiral wound gasket is subjected to
Inner and outer rings are particularly recommended for use on spiral wound
gaskets exceeding class 600lbs, but specifically recommended for high
temperatures and pressures to optimise the operational reliability of the
spiral wound sealing element. Inner rings are mandatory for PTFE filled
The material selected for the inner ring and winding
metal is usually the same as the flange metal. This prevents corrosion and
differential expansion problems. The outer centering ring is generally
manufactured from carbon steel with an anti- corrosion treatment. However,
the ring may also be manufactured in the same metal as the flange to prevent
- Type 304 Stainless
- Type 316 Stainless
- Steel, Plain
- Steel, Zinc Coated
Material Filler Selection
The table below may be used to select the correct filler.
It should be pointed out that graphite will be the optimum filler in most
cases. Only where graphite could cause media contamination, or is not
chemically resistant, should the use of another type of filler material be
recommended. In such cases, an alternative solution might be to select a
Graphite is universally chosen because of its good
chemical resistance, resistance to ageing, good gas tightness and ability to
operate at high temperatures.
PTFE is a high quality synthetic material with the
following characteristics: excellent chemical resistance, resistance to 260O
C, resistant to ageing, excellent gas tightness.
- Compressed Asbestos Jointing Strips
- Asbestos Paper
Hints Of Installation & Maintenance:
When installing a Spiral Wound Gasket, check the
dimensions of the Gaskets for use between pipe and pressure vessel flanges.
The procedure is as follows:-
Measure ID of flange contact face.
Measure Gasket ID. If Gasket ID is not 1/8" larger than flange ID, do
not use it unless it can be installed perfectly centered.
A Spiral Wound Gasket does not have the same feel as other Metallic or
Non-Metallic Gaskets during the bolting-up. It's different-because it gives
a little bit under each bolt as it is tightened. It is therefore important
to tighten the bolts in small steps in proper sequence as shown hereunder.
Final tightening must be uniform with each bolt pulling same load. This will
guarantee a trouble free joint. If not uniform, the joint may
leak-particularly after it has been in hot service. Tighten the bolts after
24 hours and again a week later.
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