Toggle Nav
Cart 0 Shopping Cart
Search
Advanced Search
Menu
Account
Loading...

LineBacker Flange Sealing Gaskets, by GPT

Farwest distributes GPT’s flange isolation kits, sealing gaskets, casing isolators, end seals, modular seals and monolithic fittings
Sealing Gaskets with a "quad" ring sealing element and a unique groove design for a wide choice of sealing materials.
Add to Wish List Add to Compare

Description

PSI LineBacker® Sealing Gaskets utilize a patented rectangular sealing element, referred to as a “quad” ring, in combination with a unique groove design to effectively seal and isolate flanges of all types. This unique design provides elastic memory. Materials such as polyimide, TFE (Teflon) and vinyl may be used as sealing elements, which dramatically increases the options available for matching gasket materials to service and environmental conditions. A much broader range of retainer material/seal element combinations may therefore be used for excellent temperature and chemical range compatibility.

Features of the LineBacker® 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 or 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 LineBacker Works

Before Tightening
The flange faces come into contact with the sealing elements, which extend slightly above the surface of the retainer. As the flange is tightened the sealing elements are compressed and move sideways into the inclined portion of the groove, developing a high unit pressure against the flange faces.

After Tightening
The flange faces have come into firm contact with the retainer, thus encapsulating the sealing elements within grooves. At the same time, the unique LineBacker seal configuration provides elastic memory for elastomers not normally associated with this characteristic - resulting in a simple flat gasket with extremely high loading and self energizing characteristics without adverse cold flow problems.

\

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

Ammonia Dry

 G-10 Teflon -65 to +220 -54 to +104

Ammonia (Wet)***

 G-10 Teflon +32 to +100 0 to +38

Bleach

 G-10 Teflon +32 to +80 0 to +27

Butylene (Butidiene)

 G-10 Teflon +32 to +100 0 to +38

Carbon Dioxide

 G-10 Nitrile +32 to +150 0 to +66

Caustic Soda (NaOH)

 G10 Teflon -65 to +225 -54 to +107

Cryogenic

 G-10 Teflon -300 to +280 -184 to +138

Ethanol

 G-10 Nitrile +32 to +100 0 to +38

Ethylene (Ethene)

 G-10 Teflon +32 to +80 0 to +27

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

LNG

 G-11 Teflon -300 to +100 -184 to +38

Mercaptan

 G-10 Teflon  -20 to +80 -29 to +27

Methanol

 G-10 Teflon +32 to +100 0 to +38

MTBE

 G-10 Special Nitrile +32 to +80 0 to +27

Nitrogen

 Phenolic Nitrile -65 to +220 -54 to +104

Oil, Crude

 G-10 Viton -20 to +280 -29 to +138

Oxygen**

 G-10 Teflon -65 to +250 -54 to +121

Pentane

 G-10 Teflon +32 to +80 0 to +27

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

Spent Liquor

 G-10 Teflon +32 to +100 0 to +38

Steam*

 G-7* Teflon to +450 To +232

Steam

 G-3 Teflon to +392 To +200

Steam*

 Yellow Jacket No Seal to +450* or +392 to +268* or +200

Styrene

 G-10 Teflon +32 to +80 0 to +27

Sulphur (Molten)

 G-10 Teflon +32 to +280 0 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

White Liquor

 G-10 Teflon +80 to +280 +27 to +138
 
* G-7 material should riot be used with hydrocarbons, riot even trace amounts.
** These are organic materials that will feed a fire if a leak occurs and an ignition source exists.
*** Ammonia (wet) - Data to +100'F (+38'C) only (same materials as dry).

 

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:
LineBacker 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.