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    Spiral Wound Gaskets (SPW Gaskets)

Goodrich Gasket Private Limited established in 1987 is a part of Flosil Group, a conglomerate with expanding interests in Manufacturing, Defense Technology, Oil & Gas, Infrastructure, Education, FMCG, Renewable energy, Investments etc and has been manufacturing all types of Industrial Gaskets for petroleum refineries and other industrial projects with a manufacturing facility of 196,000 sq. ft. of fabrication shop & machine shop in Chennai, India and equipped with state of the art machinery, handling facilities and expert engineers.


At Goodrich Gasket, we manufacture Spiral wound gaskets by spirally winding a preformed metal strip and filler on the outer periphery of metal winding mandrels whose outside diameter form the inner diameter of the gasket and superposed metal and non-metallic windings are continually wound until the required outer diameter is attained. Compatible with the flange closure in which it is to be used, spiral wound gaskets can be used over the complete temperature range from cryogenic to approximately 2000℉ and in all pressures from vacuum to the standard 2500 psi flange ratings making it a high pressure and high temperature gasket. They are more resilient than any other type of metallic gasket with higher flexibility and recovery characteristics to maintain a seal under variable working conditions.


Spiral Wound Gaskets (SPW Gaskets)


Size & Class

Spiral wound Gaskets including centering ring and inner ring are identified by Flange size (NPS),Pressure Class and the appropriate flange standards (ASME B16.5, ASME B 16.47 ).


Spiral wound Gaskets materials are selected by the USER based on suitability for the service condition. Some of the popularly used SPW Gaskets materials at Goodrich Gasket are as below:

  • Metal windings and filler materials can be CS, 316, 304, 316L, 304L, 310, 309, 317L, 430, 347, 321, Incoloy 800, Incoloy 825, INC 600, INC 625, INC X750, Hastelloy B, Hastelloy C, Monel 400, Nickel 200, Titanium, Zirconium and non-metallic filler materials such as PTFE, pholgopite, vermiculite, ceramic, and flexible graphite etc.
  • The inner ring material should match the winding material unless the purchaser specifies otherwise. The centering ring can be carbon steel that is painted, metal plated or otherwise coated to inhibit atmospheric corrosion.


The centering ring of each SPW gasket shall be permanently marked. The lettering height shall be a minimum of 2.5mm (0.1in). The following information shall be included with the centering ring markings: manufacturer's name or trade mark, pressure class, flange size (NPS) and winding metal abbreviation except that it may be omitted when 304 stainless steel is used.

Also filler material abbreviation, centering and inner ring abbreviation except that it may be omitted when CS is used for outer ring and 304 SS for inner ring and the flange identification. Gaskets intended for ASME B16.47 flanges shall be marked ASME B16.47 or B16.47A as applicable and those of B16.5 not required to be so and ASME 16.20 designation Gaskets suitable for more than one pressure shall be marked with all applicable classes.

General, Pressure class & Color code marking

Spiral-wound gaskets shall be marked with a color code that identifies the windings and filler materials. A continuous color around the outer edge of the centering ring shall identify the winding metal. The color identifying the filler material for NPS 11/2 and larger shall have four intermittent stripes spaced approximately 90 deg apart on the outer edge of the centering ring. Smaller size gaskets shall have a minimum of two stripes 180 deg apart.

Dimensions & Tolerances

Spiral-wound gaskets shall be constructed as alternate plies (circular layers counted as revolutions) of preformed metal windings and pliant fillers that are spirally wound. For the finished gasket, the filler shall be essentially flush with, but not below, the metal winding on both contact faces of the gasket. The metal strip in the winding shall be 0.15-mm (0.006-in.) to 0.23-mm (0.009-in.) thick. The filler material thickness shall be determined by the manufacturer.

The inner windings shall have a minimum of three plies of preformed metal strip without filler. The initial two plies shall have spot welds spaced 2 around the inner circumference. The minimum number of welds shall be three. The maximum distance between welds shall be 76 mm (3.0 in.). The outer windings, which shall have a minimum of three plies of preformed metal without filler, shall be spot-welded circumferentially with a minimum of three welds, the last of which shall be the terminal weld. The distance of the first weld from the terminal weld shall be no greater than 38 mm (1.5 in.). Up to four additional loose preformed metal windings beyond the terminal weld may be used to retain the gasket into the centering ring.

All spiral-wound gaskets shall be furnished assembled into a centering ring. The centering ring thickness shall be from 2.97mm(0.117 in.) to 3.33mm(0.131 in.) and suitably grooved on the inside diameter so as to retain the gasket.Inward buckling of spiral-wound gaskets has been identified as a potential problem. Inner rings shall be furnished with all spiral-wound gaskets having PTFE filler material. Inner rings for flexible graphite-filled, spiral-wound gaskets shall be furnished unless the purchaser specifies otherwise.

For all filler materials, inner rings shall be furnished in spiral-wound gaskets for

(A) NPS 24 and larger in Class 900

(B) NPS 12 and larger in Class 1500

(C) NPS 4 and larger in Class 2500

Inner rings are required for these gaskets due to high available bolt loads, which may result in outer ring damage. The inner ring thickness shall be from 2.97 mm to 3.33 mm (0.117 in. to 0.131 in.).Gaskets with inner rings should be used only with socket welding, lapped, welding neck, and integral flanges.

Spiral-wound gaskets NPS 1/2, NPS 3/4, and NPS 1 in Classes 150, 300, and 600 shall be designed so that a uniform bolt stress of 172 MPa (25,000 psi), based on the nominal bolt root diameter, will compress the gasket to a thickness of 3.30 mm 0.13 mm (0.130 in. 0.005 in.). All other gasket sizes and classes shall be designed so that a uniform bolt stress of 207 MPa (30,000 psi) will compress the gasket to a thickness of 3.30mm 0.13mm (0.130 in. 0.005 in.).

Spiral Wound Gaskets (SPW Gaskets)

Goodrich Gasket, a leading spiral wound gasket manufacturer in India offers the following types of gaskets in Spiral wound category:

Type Construction Use & Suitability
Type R Inner and outer diameter reinforced with plies of metal without filler Greater stability and better compression characteristics. Tongue & groove /male & female/groove to flat face flange assemblies.
Type RIR Solid inner metal ring as compression stop to fill annular space between flange bore & inside diameter of gasket. Prevent accumulation of solids, reduce process fluids turbulent flow and minimize flange face erosion. Suitable for male and female pipe flanges.
Type CG External ring centering gasket on flange face for more radial strength. Prevent gasket blowout, compression stop. Suitable for Flat & raised face flanges
Type CGI Solid metal Inner ring acc. to ASME B16.20 for class 900, 1500, 2500, NPS greater than 24", 12", 4" resp. & metal winding of same material. Suction side of pumps /compressors, smooth surface finish (125 Ra max), prevent over compression of gasket. Suitable for Flat & raised face flanges, corrosive/ toxic media, high press. /high temp. Service.
Type HE Standard spiral wound on outer portion & single or double jacketed for pass bar, fastened to ID of spiral wound portion. As Heat exchanger gaskets with heat exchangers requiring pass bars.
Type HE-CG Similar to Type HE with outer guide ring & spiral wound primary seal. Resiliency and excellent sealing quality.
Type HE-CGI Varied CGI with an inner ring & spiral wound steel nose/ solid metal outer ring. Accurate gasket location. Used in Heat exchangers, TEMA type flange arrangements.
Type CG-RJ Special sized CG gasket with outer ring to cover ring joint grooves. Maintenance repair item prevents SPW portion from entering groove & suitable for Standard ring joint flanges.
Type M, MC, MCS MC has Pre-formed inner &/or outer rings of spiral winding with a centering guide. MCS has a solid metal inner &/or outer ring. Boiler manholes cover assembly, high pressure systems. Depending on manhole plate configuration these are oval, round, obround in shape & prevent shouldering and pinching due to radial misplacement.
Type T Round, oval, square, diamond, obround, pear shaped gaskets. Boiler hand hole & tube cap assemblies. Relies on internal pressure in boiler to seat the gasket.
Type 625 Similar to Type R & 0.0625" thick. High pressure sealing in space restricted applications.
Carrier Ring Integral construction of 2 spiral wound gaskets placed in a specially machined metallic ring. High recovery & Ease of handling.

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