TYPE SG/IR : As per a type SG but with the addition of an inner ring. The double restraint provided by the inner and centring (outer) rings, considerably increases the recovery characteristics of the gasket. It also provides a heat and corrosion barrier, protecting the gasket winding and preventing flange erosion.
TYPE C/IR : Suitable for male and female flanges. The inner ring has the annular space between flange bore and inside diameter, thus preventing the accumulation of solids and minimizing erosion of the flange faces.
It also protects the innermost windings of the sealing element from aggresive media.
TYPE 'C' : Where tongue & groove or male & female flanges are involved, the recess wall may be used to confine and support a spiral wound gasket. In these circumstances, supporting rings are not required and the basic Type 'C' is recommended. Inner and outer diameters are reinforced with several plies of metal without filler, giving greater stability and better compression
TYPE H & H/IW : Used for sealing manholes, handholes and tubecaps. Both styles are manufactured in rectangular, oval, diamond, square and circular shapes to suit most closures. Available with an inner stainless steel wire (Type H/IW) which overcomes the risk of extrusion of the gasket under compression.
AVAILABLE MATERIALS
METAL WINDING STRIP
Stainless Steel 316L
Stainless Steel 304
Stainless Steel 309
Stainless Steel 310
Stainless Steel 316Ti
Stainless Steel 321
Stainless Steel 347
Monel 400
Nickel 200
Inconel 600
Inconel 625
Inconel X750
Incoloy 800
Incoloy 825
Hastalloy B2
Hastalloy C276
Titanium
Zirconium 702
FILLER MATERIALS
Non-Asbestos Fibre
P.T.F.E
Graphite
Ceramic
GUIDE RING MATERIALS
Carbon Steel
Stainless Steel 304
Stainless Steel 316L
Stainless Steel 316Ti
Stainless Steel 321
Stainless Steel 347
Stainless Steel 4l0
Monel 400
Nickel 200
Inconel 600
Incoloy 800
Inroloy 825
Hastalloy B2
Hastalloy C276
Titanium
Alloy 20
The standard winding thickness is 4.5mm, however Spiral Wound Gaskets can also be manufactured in the following thickness to customer request. 2.5mm, 3.2mm, 6.4mm & 7.3mm.
Spiral Wound Gaskets with inner and external rings (Style SG & SG/IR), should be fully compressed to the guide ring. Since the rings are provided as a compression stop, this will not affect the sealing performance or damage the gasket.