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PSI GasketSeal®
Sealing Gaskets


Grooves and half "O" rings in the retainer eliminate
the need for grooves in the mating surfaces.


PSI Flange Insulation Overview | PSI LineBacker™ | PSI LineBacker™ Zero, 250 & 251 | PSI GasketSeal®
PSI FlangeMate® | PSI LineSeal™ | PSI Custom Sealing Gaskets | PSI Flange Isolation Kits
PSI Isolating Sleeves & Washers

GasketSeal® Sealing Gaskets are considered to be one of the most effective methods for sealing mating surfaces of all types. The gasket consists of two molded half “O” rings (with precise crown-to-void ratio) mounted in grooves on opposite sides of a retainer. While maintaining all the advantages of a full “O” ring seal, the half “O” rings eliminate the need for sealing grooves in the mating surfaces, which also eliminates positioning and alignment concerns. GasketSeal gaskets are available in a wide variety of retainer and sealing element combinations for matching gaskets to service and environmental conditions.

Near zero "M" and "Y" factors make it possible to effect a positive seal without the tremendous bolt loads required with flat gaskets. Low compressive loads on the gasket allows the use of lighter weight and lower pressure rated flanges where permitted.

Unique features of the GasketSeal® Sealing Gasket:

  • Eliminates flange leaks.
  • Guards against blowouts.
  • Protects against fire and hostile environments.
  • Usable with any type of flange.
  • Matches gasket materials to service conditions.
  • Lowest possible clamp and compressive load.
  • Increases gasket life.
  • Insulating version is both a positive seal and a superior insulator.
  • Available in all standard ANSI and API flange sizes from 1/2” and above.
  • Available in custom odd sizes and shapes.
  • Available in pressure Ratings for all ANSI and API rated flanges.
  • For pressures from hard vacuum to 50,000 psi and higher.

How GasketSeal® Works
  

Before Tightening
The flange faces come into contact with the crown of the sealing elements. As the flange is tightened the crowns are compressed into the molded-in voids in the sealing elements, resulting in a seal that will maintain positive, dynamic contact against the flange faces under all conditions.

After Tightening
The flange faces have come into firm contact with the retainer, thus encapsulating the sealing elements within grooves and guarding them from exposure to external environments or internal media. At the same time, the elastic memory characteristics of the confined sealing elements results in zero “m” and “y” factors, making it possible to effect and maintain a positive seal at the lowest possible compressive load.

Wide Choice of Gasket Materials
  
Metal Retainer
Materials
Insulating Retainer
Materials
Sealing
Elements
  Aluminum
  Brass
  Carpenter 20
  Carbon Steel
  Cast Iron
  Clad Steel Materials
  Copper
  Ductile Iron
  Hastelloy B, C, X
  Inconel X
  Monel
  Nickel 200
  Soft Iron
  Stainless Steel
  Tantalum
  Tin
  Titanium
  Vanadium
  Ceramic
  Epoxy Glass
  Glass
  Lucite
  Melamine
  Phenolic
  Polyester Glass
  Polyethylene
  Silicone Glass
  Vinyl
  Buna-N (Nitrile)
  Buna-S
  Butyl
  EPDM
  Hypolon
  Kel-F
  Natural Rubbers
  Neoprene
  Nylon
  Polyurethane
  Silicone Rubber
  Viton®

  ® DuPont

Suggested Sealing Gasket Material Compatibility
  

Medium

Retainer Seal Temperature
Range °F
Temperature Range °C
Acetone Phenolic Nitrile +32 to +80 0 to +27
Air G-10 Nitrile -65 to +225 -54 to +107
Carbon Dioxide G-10 Nitrile +32 to +150 0 to +66
Ethanol G-10 Nitrile +32 to +100 0 to +38
Fuel Oil G-10 Viton -20 to +280 -29 to +138
Gas, Natural Phenolic Nitrile -65 to +220 -54 to +104
Gas, Sour Phenolic Viton -20 to +220 -29 to +104
Gasoline G-10 Teflon -65 to +225 54 to +107
Hydrogen G-10 Nitrile -65 to +250 -54 to +121
Jet Fuel G-10 Viton -20 to +225 -29 to +107
Nitrogen Phenolic Nitrile -65 to +220 -54 to +104
Oil, Crude G-10 Viton -20 to +280 -29 to +138
Propane G-10 Nitrile or Teflon +32 to +80 0 to +27
Propylene G-10 Viton +32 to +80 0 to +27
Sewage G-10 Viton -20 to +280 -29 to +138
Toluene G-10 Viton or Teflon +32 to +150 0 to +66
Water (Hot) G-10 Nitrile +175 to +250 +79 to +121
Water (Potable) G-10 Nitrile +32 to +250 0 to +121
Water (Sea) G-10 Nitrile +32 to +250 0 to +121

 
General Notes:
The foregoing performance data are intended as guidelines only. Performance suitability for any specific applications should be determined by the user. Variation in temperature, pressure, concentration or mixtures acting synergistically may preclude suggested service use. Material selection is at the sole risk of the user. Consult with a specialist for specific applications. PSI's responsibilities will be limited to those listed in the PSI standard warranties.

Metal Retainers:
GasketSeal gaskets are available with a wide range of metal retainers to offer compatibility with flange metals, for extremely hazardous fluids, or for extremes in temperatures and pressures. Please contact Corrosion Control Products Company.

Physical Properties

GasketSear® and LineBacker® gaskets are available in a wide variety of retainer and sealing element combinations for matching gaskets to service and environmental conditions. This greater variety of materials also provides excellent temperature and chemical range compatibility.

ASTM Test
Parameter
Plain
Phenolic
Neo-Faced
Phenolic
G3
Hi-Temp
Phenolic
G-7*
Silicone
Glass
G-10
Epoxy
Glass
G-11
Epoxy
Glass
D149 Dielectric Strength
Volts/mil (short time)
500 500 500 350-400 550 550
D695 Compressive Strength (psi) 25,000 25,000 50,000 40,000 50,000 50,000+
D229 Water Absorption (%) 1.6 1.6 0.7 0.07 0.10 0.10
D257 Insulation Resistance (MOhms) 40,000 40,000 46,000 2,500 200,000 200,000
D790 Flexural Strength (psi) 22,500 22,500 60,000 27,000 60,000 75,000+
D785 Hardness Rockwell "M" 85 85 115 105 115 115
D256 IZOD Impact Strength
(ft-lbs/inch)
1.2 1.2 12.0 8.0 14.0 12.0
D638 Tensile Strength (psi) 20,000 20,000 42,000 25,000 45,000 43,000
D732 Shear Strength (psi) 10,000 10,000 18,000 20,000 22,000 22,000
  Operating Temp (ºF) -65 to
+220
-65 to
+175
-65 to
+392
Cryogenic
to +450
Cryogenic
to +280
Cryogenic
to +349
  Operating Temp (ºC) -54 to
+121
-54 to
+79
-54 to
+200
Cryogenic
to +138
Cryogenic
to +280
Cryogenic
to +176
  
* G-7 material should not be used with hydrocarbons, not even trace amounts.

Seal Element Temperature Limits
  

  Nitrile Viton Teflon Neoprene EPDM
Degrees F -65 to +250 -20 to +350 Cryogenic
to +450
-40 to +175 -65 to +300
Degrees C -54 to +121 -29 to +177 Cryogenic
to +232
-40 to _79 -54 to +149

  

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