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PSI LineBacker®
Flange
Sealing Gaskets
Sealing Gaskets with a "quad" ring sealing
element and a
unique groove design for a wide choice of sealing materials
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
| 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
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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.
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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.
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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
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Medium |
Retainer |
Seal |
Temperature
Range °F |
Temperature Range °C
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Acetone |
Phenolic |
Nitrile |
+32 to +80 |
0 to +27 |
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Air |
G-10 |
Nitrile |
-65 to +225 |
-54 to +107 |
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Ammonia Dry |
G-10 |
Teflon |
-65 to +220 |
-54 to +104 |
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Ammonia (Wet)*** |
G-10 |
Teflon |
+32 to +100 |
0 to +38 |
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Bleach |
G-10 |
Teflon |
+32 to +80 |
0 to +27 |
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Butylene (Butidiene) |
G-10 |
Teflon |
+32 to +100 |
0 to +38 |
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Carbon Dioxide |
G-10 |
Nitrile |
+32 to +150 |
0 to +66 |
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Caustic Soda (NaOH) |
G10 |
Teflon |
-65 to +225 |
-54 to +107 |
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Cryogenic |
G-10 |
Teflon |
-300 to +280 |
-184 to +138 |
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Ethanol |
G-10 |
Nitrile |
+32 to +100 |
0 to +38 |
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Ethylene (Ethene) |
G-10 |
Teflon |
+32 to +80 |
0 to +27 |
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Fuel Oil |
G-10 |
Viton |
-20 to +280 |
-29 to +138 |
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Gas, Natural |
Phenolic |
Nitrile |
-65 to +220 |
-54 to +104 |
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Gas, Sour |
Phenolic |
Viton |
-20 to +220 |
-29 to +104 |
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Gasoline |
G-10 |
Teflon |
-65 to +225 |
54 to +107 |
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Hydrogen |
G-10 |
Nitrile |
-65 to +250 |
-54 to +121 |
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Jet Fuel |
G-10 |
Viton |
-20 to +225 |
-29 to +107 |
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LNG |
G-11 |
Teflon |
-300 to +100 |
-184 to +38 |
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Mercaptan |
G-10 |
Teflon |
-20 to +80 |
-29 to +27 |
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Methanol |
G-10 |
Teflon |
+32 to +100 |
0 to +38 |
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MTBE |
G-10 |
Special Nitrile |
+32 to +80 |
0 to +27 |
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Nitrogen |
Phenolic |
Nitrile |
-65 to +220 |
-54 to +104 |
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Oil, Crude |
G-10 |
Viton |
-20 to +280 |
-29 to +138 |
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Oxygen** |
G-10 |
Teflon |
-65 to +250 |
-54 to +121 |
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Pentane |
G-10 |
Teflon |
+32 to +80 |
0 to +27 |
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Propane |
G-10 |
Nitrile or Teflon |
+32 to +80 |
0 to +27 |
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Propylene |
G-10 |
Viton |
+32 to +80 |
0 to +27 |
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Sewage |
G-10 |
Viton |
-20 to +280 |
-29 to +138 |
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Spent Liquor |
G-10 |
Teflon |
+32 to +100 |
0 to +38 |
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Steam* |
G-7* |
Teflon |
to +450 |
To +232 |
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Steam |
G-3 |
Teflon |
to +392 |
To +200 |
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Steam* |
Yellow Jacket |
No Seal |
to +450* or +392 |
to +268* or +200 |
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Styrene |
G-10 |
Teflon |
+32 to +80 |
0 to +27 |
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Sulphur (Molten) |
G-10 |
Teflon |
+32 to +280 |
0 to +138 |
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Toluene |
G-10 |
Viton or Teflon |
+32 to +150 |
0 to +66 |
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Water (Hot) |
G-10 |
Nitrile |
+175 to +250 |
+79 to +121 |
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Water (Potable) |
G-10 |
Nitrile |
+32 to +250 |
0 to +121 |
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Water (Sea) |
G-10 |
Nitrile |
+32 to +250 |
0 to +121 |
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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.
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