LineBacker Flange Sealing Gaskets, by GPT

Sealing Gaskets with a "quad" ring sealing element and a unique groove design for a wide choice of sealing materials.
  • 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.

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    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.