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1. SPIRAL WOUND GASKETS
PROPERTIES AND APPLICATION
MS 10
Spiral wound gaskets are special semi-metallic gaskets of great resilience, there
fore they are very suitable for applications featuring heavy operating conditions.
Spiral wound gaskets are manufactured by spirally winding a V-shaped metal strip
and a strip of non-metallic filler material. The metal strip holds the filler, providing
the gasket with mechanical resistance and resilience. Spiral wound gaskets
can be reinforced by an outer centering ring and/or inner retaining ring. The
outer centering ring controls the compression and holds the gasket centrally
within the bolt circle. The inner retaining ring increases the axial rigidity and resilience
of the gasket. Spiral wound gaskets should always be in contact with the flange and
should not protrude into the pipe or project from the flange. Spiral wound gaskets
can be used for sealing flange joints, manhole and handhold covers, tube
covers, boilers, heat exchangers, pressure vessels, pumps, compressors and valves;
in industries such as petrochemical, pharmaceutical, shipbuilding, and food
processing, in power industries and nuclear power stations. They are ideal for
steam, oil, liquids, gases, acids, alkalines, various organic mediums and solvents.
MS 12
MS 14
MS 16
MS 10 T
ADVANTAGES
- Sealing under heavy operating conditions.
- Strong stress compensation, stable and reliable sealing performance even under
frequent pressure fluctuation condition.
- Solid construction provides stability and seallability even when the sealing surfaces
are slightly corroded or bent.
- Easy installation.
SHAPE AND CONSTRUCTION
Spiral wound gaskets are produced in several styles and combination of
materials to fit the most stringent application. Spiral wound gaskets are usually
of circular shape, however we can produce them in other shapes such as: oval,
rectangular, with round corners, etc. Our standard production program comprises
a range of spiral wound gaskets with inner diameters of 10 mm to 3000 mm
and a nominal thickness of 3.2 mm, 4.5 mm and 6.5 mm. Spiral wound gaskets
of non-standard dimensions and shapes, and larger diameters are available on
request.
Gasket standard styles:
- Gaskets without guide and inner ring (Type MS 10)
- Gaskets without guide and inner ring (Type MS 10T)*
- Gaskets with inner ring (Type MS 12)
- Gaskets with guide (outer) ring (Type MS 14)
- Gaskets with guide and with inner ring (Type MS 16)
* With PTFE sealing zone
1. SPIRAL WOUND GASKETS
Metallic strip
Standard thickness of the metallic strip is 0.2 mm (0.18).
MATERIALS FOR METALLIC STRIP
ASTM
DIN Material No.
AISI 304
1.4301
AISI 316, 316 L
1.4401, 1.4404
AISI 321
1.4541
AISI 316 Ti
1.4571
Monel (NiCu30Fe)
2.4360
Other alloys available on request.
Filler
Filler is normally used for thicknesses from 0.5 mm to 0.6 mm.
- Flexible graphite 98%
- Flexible graphite 99.85%
- PTFE, EPTFE
- Ceramic, Micalit
Centering ring
The centering ring does not come into direct contact with contained fluid. It is normally
made of carbon steel and electro plated or painted to avoid corrosion. Other
materials are available on request.
Inner ring
Inner ring is used to avoid excessive compression due to high seating stress in
high-pressure service and it is also used to reduce turbulence in the flange area. It is
normally made of the same material as the gasket metallic strip.
DIMENSIONS
s
Manufacturing sizes
This limitations are general and can vary according to the special customer
requirements.
LIMITATIONS FOR MANUFACTURING DIMENSIONS
Thicknesss
Max diameter
Maximum width - bG [mm]
[mm]
d3 [mm]
Graphite
PTFE
2.5
300
16
13
3.2
700
22
19
4.5
1500
30