Products / Spiral Wound Gaskets


CR Series CRIR Series R Series RTX Series


Spiral Wound Gaskets


Spiral wound gaskets has the ability to recover under the action of fluctuating loads caused by process fluid pressure and temperature changes, flange surface temperature variations, flange rotation, bolt stress relaxation and creep.

The gasket sealing element consists of pre-formed metallic winding strip with layers of softer, more compressible sealing material which, during compression, is defined and flows to fill imperfections in the flange surface s when the gasket is seated. The metal strip holds the filler giving the gaskets mechanical resistance and resilience.

Be certain that the gasket you order is as resistant a possible to the media and temperature involved. Check the chemical compatibility of the metal as well as the filler material for the media to be sealed. As a general rule, the metal used in either the spiral winding or double-jacketed gasket should be similar to the flange material.

The compressibility of flexible graphite makes it an excellent filler material for metallic gaskets. Flexible graphite may be used in services with temperatures up to 1020°F (550°C), though it should not be used with strong oxidizers such as nitric or sulfuric acid. PTFE filler material provides excellent chemical resistance at temperatures below 500°F (260°C). In accordance with ASME B16.20, an inner ring is required when using conventional PTFE filler materials, in order to protect the winding from radial buckling.

Spiral wound gasket can be manufactured from a range of filler materials according to different service conditions

 
 

 

  R Series   CR Series
  •    Spiral wound sealing element.
•    Wide choice of material for filter and metal strip.
•    Suitable for high pressure and temperature applications.
•    Recommended flanges tongue & groove, male to female & flat face to recess.
•    General & critical duties.
   •    Spiral wound sealing element.
•    Solid metal outer ring used as centering device & compression stop.
•    Used mainly on raised face & flat face flanges.
•    General duties.
   RIR Series    CRIR Series
  •    Spiral wound sealing element.
•    Solid metal inner ring.
•    High pressure temperature capability.
•    Male to female flanges.
•    General & critical duties.
   •    Spiral wound sealing element.
•    Solid metal inner & outer ring.
•    Suitable for high pressure & temperature applications.
•    Prevents turbulence & erosion damage to flanges.
•    Prevents damage to the gasket bore & inner windings.
•    Acts as a heat shield & a corrosion barrier.
•    General & critical duties.
  CRIR/ PTFE Inner Series   CRIR/ Graflex Inner Series
  •    Spiral wound sealing element.
•    Solid PTFE inner ring solid metal outer ring.
•    Raised face & flat face flanges.
•    Acts as a secondary seal.
•    Environmentally friendly.
•    Corrosion barrier.
  •    Spiral wound sealing element.
•    Solid metal graflex covered inner.
•    Suitable for high pressure & temperature applications.
•    Raised face & flat face flanges.
•    Corrosive media.
•    Acts as a secondary seal.
  RHD Series   R Graflex Faced Series
  •    Spiral wound sealing element. Wound high density.
•    Wide choice of materials for filler & metal strip.
•    High pressure pumps.
•    High pressure valves (Gas services).
•    Gas service.
•    Low emission tested.
  •    Spiral wound sealing element.
•    Covered with 0.5mm graflex.
•    Used to manhole covers.
•    Low bolt load applications.
•    Uneven sealing faces.
•    Double integrity seal.
  RTX Series    
  •    For heat exchange applications.
•    Spiral wound sealing element.
•    A combination of inner & outer rings.
•    The inner ring could have pass bars or could carry either a metal clad or soft gasket with pass bars.
•    Manufactured to customer design.

 

 

  Metal Strip Material    

 

 

Stainless Steel 316L, 316, 304, 321, 310, 347 duplex.
Monel 400.
Inconel 600, 625.
Nickel 200.
Titanium, hastelloy/ incoloy 800, 825.
 
Filler Material Temp. Units
Ceramic   
PTFE   
Graphite   
Asbestos free   
800 ºC
260 ºC
550 ºC
460 ºC
  Gasket Compression and Choice of Thickness    Recommended Flange Surface Finish
 

Gasket Nominal Thickness

Recommended Compressed Thickness

3.2mm

2.3-2.5mm

4.5mm

3.2-3.5mm

6.4mm

4.6-4.9mm

7.2mm

4.8-5.0mm

 

Spiral Wound Gaskets  are capable of giving an excellent seal over a wide range of surface finishes but as a general guide we offer the following:

 

Micro Inch

Micro Metre

General

125-200

3.2-5.1

Critical

125

3.2

Vacum

80

2.0

 

Centering  and Inner  Ring Standard Materials
Carbon steel zinc plated with chrome passivate††.
Stainless steel 316, †304, 410, 316L, Duplex.
Monel nickel incoloy.
Titanium Inconel 600, 625.

 

Flange Suitability
BS1560 and ANSI B 16.5 ½”- 24” 150-2500 lbs
BS10 tables D-T
B4504 10-250 bar
MSS Sp 44 26”-60” 150-900 lbs
API 605 26”-60” 150-900 lbs
DIN 1514-2

 

Maximum Pressure Verses Temperature

Flange Class

100ºF(37ºC)

300 ºF(148ºC)

500ºF(260ºC)

700ºF(398ºC)

1000ºF(538ºC)

150

290psi

230 psi

------

------

------

300

750 psi

730 psi

665 psi

505 psi

50 psi

600

1500 psi

1455 psi

1330 psi

1010 psi

105 psi

900

2250 psi

2185 psi

1995 psi

1510 psi

155 psi

1500

3750 psi

3640 psi

3325 psi

2520 psi

260 psi

2500

6250 psi

6070 psi

5540 psi

4200 psi

430 psi

 

 

 

 

 

Important Notes

These figures are not complete and refer to one type of carbon steel only. Consult ANSBI 16.5 for full details.

Other standard flanges e.g. DIN, BS10, BS4504 similarly have temperature/ pressure rating listed.

 

 

 

 

 

 

Heat Resistant Gasket   BS-HEAT

 

 

-    Combination of graphite filler and mica layers give superior fire safety
-    Ideal for oxidizing environment, layers of pure mica protect graphite filler and resist oxidation.
-    Good choice for plant steam drums, hydrocarbon crackers, hydrogen unit and exhaust manifolds.

Specifications:

-    Heat Resistant graphite filler.
-    Heat and oxidation resistant pure mica filler.
-    Spiral wound winding strips available in most commercial available metal.
-    Maximum temperature around 670 ºC.
-    Flange class from 150 to 600.
-    Flange size range from 2” up to 24”.
-    Gasket M Factor is 3.0
-    Gasket Y Factor is 7,500 Psi.

Temperature Limit for common material

Material

Minimum

Maximum

Abbn.

 

Color Code

 ºC

C

 

Common Metal

 

 

304 Stainless Steel

-195

760

304

 

Yellow

316L Stainless Steel

-100

760

316L

 

Green

317L Stainless Steel

-100

760

317L

 

Maroon

321 Stainless Steel

-195

760

321

 

Turquoise

347 Stainless Steel

-195

925

347

 

Blue

Carbon Steel

-40

540

CRS

 

Silver

20Cb-3 (Alloy 20)

-185

760

A-20

 

Black

HASTELLOY B 2

-185

1090

HAST-B

 

Brown

HASTELLOY C 276

-185

1090

HAST-C

 

Beige

INCOLOY 800

-100

870

IN 800

 

White

INCOLOY 825

-100

870

IN 825

 

White

INCONEL 600

-100

1090

INC 600

 

Gold

INCONEL 625

-100

1090

INC 625

 

Gold

INCONEL X750

-100

1090

INX

 

No Color

MONEL 400

-130

820

MON.

 

Orange

Nickel 200

-195

760

NI

 

Red

Titanium

-195

1090

TI

 

Purple

Filler Material

 

 

Ceramic

-212

1090

CER

 

Light Green

Flexible Graphite

-212

454

FG

 

Gray

PTFE

-240

260

PTFE

 

White