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Spiral Wound Gasket

Metallic Gaskets | Spiral Wound Gasket

A requirement of any gasket is the ability to recover under variable loads. The effects of pressure and temperature fluctuations, the temperature difference across the flange face, together with flange rotation, bolt stress relaxation and creep, demand a gasket with adequate flexibility and recovery to maintain a seal under variable and uneven loading. The spiral wound gasket meets these requirements.

A requirement of any gasket is the ability to recover under variable loads. The effects of pressure and temperature fluctuations, the temperature difference across the flange face, together with flange rotation, bolt stress relaxation and creep, demand a gasket with adequate flexibility and recovery to maintain a seal under variable and uneven loading. The spiral wound gasket meets these requirements. Description: Spiral-wound gaskets are made of a preformed metallic v-shaped strip and a soft Non-Metallic material wound together under pressure, with an inner and outer guide ring. CONSTRUCTION: The winding is manufactured in the form of a spiral with filler material between the windings. The filler materials fill the irregularities of the flanges. The external guide ring has the function of centering the gasket in the flanges and gives the sealing elements additional resistance against line pressure and excessive bolt torque.

Spiral Wound Gasket Basic Type (Type R)

Basic construction type , Inner and outer diameters are reinforced with several plies of metal, without filler, to give greater stability and sealing.

Typical Application

Suitable for applications including valves, valve bonnet, vessels and pumps in tongue and groove, male and female or grooved to flat face flange assemblies.

 Spiral Wound Gasket with inner ring (Type IR)

Style R with a solid metal inner ring, designed for flanges without a compression stop. To prevent accumulation of solids, reduce turbulent flow of process fluids and minimize erosion, damages of gasket between flange bore and the inside diameter, the annular space is filled up by solid inner metal ring.

Typical Application Suitable for male and female pipe flanges.

Spiral Wound Gasket with Outer ring (Type CR)

Solid outer ring accurately Centers the gasket on the flange face to gives the additional radial strength to prevent heat and corrosion barrier protecting gasket windings and preventing flange erosion. In case of installing the outer ring, it is very easy to install the gasket to flange face because the end of outer ring will touch at bolts.

Typical Application This gasket is suitable for use with flat face and raised face flanges up to and inclusive of class 2500. Above class 600 an internal ring is recommended.

Spiral Wound Gasket With inner and Outer Ring (Type CRIR)

This gasket is a Style CR gasket with an internal ring for an additional compression limiting stop. It will prevent the corrosions on flange face at annular space. For use with flat face and raised face flanges, this gasket features increased compressive force for blow-out prevention.

Typical Application Suitable for use with flat face and raised face flanges and specified for high pressure / temperature service - Class 900 and above or where corrosive or toxic media are present.

Standards

•    Products are manufactured in accordance with all relevant gasket standards to suit flange designations: ASME B 16.20, ASME B 16.5, BS1560, ASME B 16.47 (A or B). •    Color code as ASME B 16.20 on request.

Filler Material

Maximum Temperature

ASME B16.20 Color Coding

Graphite

500°C

Grey Stripe

PTFE

260°C

White Stripe

Mica

1000°C

Light Green Stripe

Mica and Graphite

900°C

-

Winding Material

Maximum Temperature

ASME B16.20 Color Coding

Carbon Steel

500°C

Silver

304 Stainless Steel

650°C

Yellow

316L Stainless Steel

800°C

Green

Duplex UN S31803

800°C

N/A

347 Stainless Steel

800°C

Blue

321 Stainless Steel

800°C

Turquoise

Monel 400

450°C

Orange

Nickel 200

315°C

Red

Titanium Gr 2

350°C

Purple

Hastelloy B-2/B-3

450°C

Brown

Hastelloy C-276

450°C

Beige

Inconel 600

1000°C

Gold

Inconel 625

450°C

Gold

Inconel X-750

1000°C

N/A

Incoloy 825

450°C

N/A

Zirconium

500°C

N/A

Super Duplex

600°C

N/A

254 SMO

600°C

N/A

Titanium

350°C

N/A

Hastelloy

450°C

N/A

Hastelloy

450°C

N/A

Alloy 20

600°C

N/A

  • Products are manufactured in accordance with all relevant gasket standards to suit flange designations: ASME B 16.20, ASME B 16.5, BS1560, ASME B 16.47 (A or B).
  • Color code as ASME B 16.20 on request.

 

Filler Material Maximum Temperature ASME B16.20 Color Coding
Graphite 500°C Grey Stripe
PTFE 260°C White Stripe
Mica 1000°C Light Green Stripe
Mica and Graphite 900°C -
Winding Material Maximum Temperature ASME B16.20 Color Coding
Carbon Steel 500°C Silver
304 Stainless Steel 650°C Yellow
316L Stainless Steel 800°C Green
Duplex UN S31803 800°C N/A
347 Stainless Steel 800°C Blue
321 Stainless Steel 800°C Turquoise
Monel 400 450°C Orange
Nickel 200 315°C Red
Titanium Gr 2 350°C Purple
Hastelloy B-2/B-3 450°C Brown
Hastelloy C-276 450°C Beige
Inconel 600 1000°C Gold
Inconel 625 450°C Gold
Inconel X-750 1000°C N/A
Incoloy 825 450°C N/A
Zirconium 500°C N/A
Super Duplex 600°C N/A
254 SMO 600°C N/A
Titanium 350°C N/A
Hastelloy 450°C N/A
Hastelloy 450°C N/A
Alloy 20 600°C N/A
Read 3415 times Last modified on Sunday, 28 August 2016 18:29

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