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PSI
LineBacker™
Zero, 250 & 251
Sealing Gaskets
Sealing Gaskets designed to address the
regulations associated
with asbestos substitute gaskets and fugitive emissions.
| Significant chemical and material
composition improvements have provided an opportunity for the
development of three gaskets, designed to address the regulations
associated with asbestos substitute gaskets and fugitive emissions.
 LineBacker® Zero,
LineBacker®
250 and LineBacker®
251 gaskets are manufactured from new proprietary materials that
provide excellent resistance against environmental leakage without
the health hazards associated with asbestos type gaskets. In
addition to providing zero environmental leakage, this new line of
sealing gaskets:
-
 Eliminate
flange leaks.
- Guard against blowouts.
- Protect against hostile
environments and fire.
- Resolve asbestos substitution
concerns.
- Eliminate cold flow problems.
- Reduce inventory costs.
- Increase the overall life of
the system.
Sizes: All standard ANSI and API flange sizes from 1/2” and above.
Shapes: Suitable for custom or odd sizes and shapes.
Pressure Ratings: All ANSI and API rated flanges. Pressures from hard vacuum to 50,000 psi and higher.
Solving Five
Sealing Problems
-
The LineBacker Tackles
Asbestos Substitute Problems.
The LineBacker seals better than either asbestos or asbestos
substitute gaskets under most conditions. The LineBacker will
maintain it’s sealing integrity from hard vacuum to pressures in
excess of ANSI and API flange test ratings.
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The LineBacker Tackles
Flange Leaks and Blowouts.
The flange-to-retainer loading and retainer hoop strength,
combined with the powerful pressure-energized feature of the
LineBacker is powerful enough to prevent sudden catastrophic
gasket failure.
-
The LineBacker Tackles
Installation and Maintenance Costs.
A positive seal is effected first time, every time. Time spent
in re-tightening or re-sealing flanges to compensate for gasket
materials cold flow is also eliminated.
-
The LineBacker Tackles
Inventory Costs.
The patented design of the LineBacker permits it to be used with
ring joint, flat faced or raised face flanges; or with any
combination of these flanges in a given size and pressure
rating.
-
The LineBacker Tackles
Flange Damage.
Near zero “m” and “y” factors make it possible to effect a
positive seal without the tremendous bolt loads that are
required with flat gaskets. Choosing retainer materials
compatible with the flange materials will reduce potential
corrosion problems. Also, the unique design prevents flange
galling that can occur with chevron design gaskets.
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Physical
Properties
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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Test
Standard |
Test
Parameter |
LineBacker
Zero |
LineBacker
250 |
Linebacker
251 |
|
ASTM D149 |
Dielectric Strength
Volts/mil (Short Time) |
500 |
500 |
550 |
|
ASTM D695 |
Compressive Strength |
25,000 psi |
50,000 psi |
50,000 psi |
|
ASTM D229 |
Water Absorption |
1.8% |
0.15% |
0.15% |
|
ASTM D790 |
Flexural Strength |
20,500 psi |
50,000 psi |
50,000 psi |
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ASTM D785 |
Hardness |
85 |
110 |
110 |
|
ASTM D256 |
IZOD
Impact Strength |
1.2
ft-lbs/in |
11.5
ft-lbs/in |
2.5
ft-lbs/in |
|
ASTM D638 |
Tensile Strength |
23,000 psi |
40,000 psi |
45,000 psi |
|
ASTM D732 |
Shear Strength |
10,000 psi |
18,000 psi |
20,000 psi |
|
ASTM F-36 |
Compressibility |
1.8% |
2.0% |
2.1% |
|
ASTM F-36 |
Recovery |
100.0% |
88.9% |
88.9% |
|
ASTM F-38(B) |
Creep Relaxation |
65.7% |
17.2% |
5.1% |
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DIN-3535 |
Gas
Permeability |
0.00
cm3/min |
0.29
cm3/min |
0.43
cm3/min |
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DIN 52913 |
Stress Relaxation |
N/A |
49.4N/mm2 |
N/A |
| |
Operating Temperature |
-60
to +220ºF
-51 to +104°C |
-60
to +350°F
-51 to +177°C |
Cryogenic to
+250° F (121°C) |
Suggested
Sealing Gasket Material Compatibility
|
|
Material |
LineBacker
Zero |
Linebacker
250 |
LineBacker
252 |
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Ammonia |
R |
R |
R |
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Ammonium Hydroxide |
F |
F |
R |
|
Benzene |
R |
R |
R |
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Butane |
NT |
NT |
R |
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Calcium Hydroxide |
U |
U |
R |
|
Crude Oil |
R |
R |
R |
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Dilute Acids |
R |
R |
R |
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Ethanol |
|
|
|
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Gasoline |
R |
R |
R |
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Hydrochloric Acid 20% |
R |
R |
R |
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Hydrogen |
NT |
NT |
R |
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Hydrogen Sulfide |
NT |
NT |
R |
|
Jet Fuel |
R |
R |
R |
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Kerosene |
R |
R |
R |
|
Methanol |
R |
R |
R |
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Naphtha |
R |
R |
R |
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Natural Gas |
R |
R |
R |
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Nitric Acid 10% |
U |
U |
R |
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Nitric Acid 20% |
U |
U |
F |
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Potable Water |
NR |
NR |
R |
|
Propane |
R |
R |
R |
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Salt Brine |
R |
R |
R |
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Sea Water |
R |
R |
R |
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Sewage |
R |
R |
R |
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Steam to 350ºF |
U |
R |
U |
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Steam Condensate to 250ºF |
U |
R |
F |
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Sulfuric Acid 10% |
U |
U |
R |
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Toluene |
F |
F |
R |
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R = Resistant NR = Not Recommended F = Fair
U = Unsatisfactory NT = Not
Tested
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.
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