PSI LineBacker® Zero, 150 and 151 Specialty Sealing Gaskets

Description

PSI LineBacker® Zero, 150 and 151 Specialty Sealing Gaskets

Linebacker Gasket Seal and Isolator

Description

LineBacker® sealing gaskets utilize a 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. With the unique “quad” ring design, elastic memory is provided for elastomers not normally associated with this characteristic. Materials such as AFLAS, TFE (Teflon) and KALREZ may therefore be used as sealing elements which dramatically increases the options available for matching gasket materials to service and environmental conditions. This greater variety of materials also provides excellent temperature and chemical range compatibility. LineBacker® sealing gaskets are self energizing with theoretical near zero “m” and “y” factors resulting in effecting a positive seal without excessive bolt loads required with flat gaskets.

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® 250 gaskets are manufactured from proprietary materials that provide excellent resistance against environmental leakage without the health hazards associated with asbestos type gaskets.

Benefits, Features, Sizes, and Ratings

Benefits and Features

  • Eliminates Flange Leaks.
  • Guards against blowouts.
  • Protects against fire and hostile environments.
  • Resolves asbestos substitution concerns.
  • Eliminates cold flow problems.
  • Reduces inventory costs.
  • Increases overall life of the system.

Sizes

  • All standard ANSI and API flange sizes from 1/2″ and above.
  • Custom odd sizes and shapes.

Pressure Ratings

  • All ANSI and API rated flanges.
  • Pressures from hard vacuum to 50,000 psi and higher.

How The Seal Functions

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.
Linebacker Gasket Seal and Isolator
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.
Linebacker Gasket Seal and Isolator
Linebacker Gasket Type E Linebacker Gasket Type F
Type E Gasket

The gasket retainer extends out to the O.D. of the flange. Holes are cut in a type “E” gasket at the bolt circle to accommodate threaded studs or bolts.
Type F Gasket

The gasket retainer extends out to the I.D. of the bolt circle.

LineBacker® Tackles Problems

Asbestos Substitue Problems
The LineBacker® seals better than either asbestos or asbestos substitute gasket 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.

Cost Problems
A positive seal is effected the first time, every time. Time spent in re-tightening or re-seating flanges to compensate for gasket materials cold flow is also eliminated.

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.

Leak and Blowout Problems
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.

Flange Damage Problem
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.

Linebacker Gasket Seal and Isolator Linebacker Gasket Seal and Isolator Linebacker Gasket Seal and Isolator
Physical Properties of
LineBacker®Zero™, LineBacker®250™ & LineBacker®251™
ASTM Test
Method
LineBacker®
Zero™
LineBacker®
250™
LineBacker®
251#8482;
D149 Dielectric Strength
Volts/Mil (Short Term)
500 500 550
D695 Compressive Strength
(psi)
25,000 50,000 50,000
D229 Water Absorption
(percent)
1.8 0.15 0.15
D790 Flexural Strength
(psi)
20,500 50,000 50,000
D785 Harness
Rockwell “M”
85 110 110
D256 IZOD Impact Strength
(Ft. Lbs./In.)
1.2 11.5 12.5
D638 Tensile Strength
(psi)
23,000 40,000 45,000
D32 Shear Strength
(psi)
10,000 18,000 20,000
F-36 Compressibility
F-36 Recovery (percent) 1.8 2.0 2.1
F-38(B) Creep Relaxation (percent) 100.0 88.9 88.9
DIN-3535 Gas Permeability (cm3/min.) 0.00 0.29 0.43
DIN 52913 Stress Relaxation N/A 49.4N/mm2 N/A
Temperature Range
Degrees Farenheit
-60 to +220 -60 to +350 Cryogenic to +250
Temperature Range
Degrees Celsius
-51 to +104 -51 to +177 Cryogenic to +121
Suggested Flange Isolation Material Compatibility
Medium LineBacker®
Zero⁜
LineBacker®
150⁜
LineBacker®
151⁜
Ammonia R R R
Ammonium Hydroxide F F R
Benzine R R R
Butane NT NT R
Calcium Hydroxide U U R
Crude Oil R R R
Dilute Acids R R R
Dilute Caustics U R R
Ethanol NR NR R
Gasoline R R R
Hydrocholric Acid 20% R R R
Hydrogen NT NT R
Hydrogen Sulfide NT NT R
Jet Fuel R R R
Kerosene R R R
Methanol R R R
Naptha R R R
Natural Gas R R R
Nitric Acid 10% U U R
Nitric Acid 20% U U F
Potable Water NR NR R
Propane R R R
Salt Brine R R R
Sea Water R R R
Sewage R R R
Steam to 350°F U R U
Steam Condensate to 250°F U R F
Sulfuric Acid 10% U U R
Tolulene F F R
LEGEND: R = Resistant – • – NR = Not Recommended – • – F = Fair
U = Unsatisfactory – • – NT = Not Tested
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 or Allied Corrosion Industries for specific applications.
PSI’s responsibilities will be limited to those listed in the PSI
standard warranties.

Linebacker Gasket Seal and Isolator Linebacker Gasket Seal and Isolator Linebacker Gasket Seal and Isolator

How to Order

To order LineBacker® Sealing/Isolating Gaskets please indicate the following:

  1. Quantity
  2. Nominal Pipe Size
  3. Pressure Rating
  4. Gasket Type: E or F
  5. Gasket Style: LineBacker®
  6. Retainer Material
  7. Sealing Element
  8. Weld neck or slip-on application
  9. Note all special requirements.

Warranty

Manufacturer’s warranty statement will be supplied upon request to Allied Corrosion Industries, Inc.

Reduced Emission Specialty Isolating Gaskets

Significant chemical and material composition improvements are now being incorporated into sealing gaskets designed to address the regulations associated with asbestos type gaskets. Three versions are manufactured from new proprietary materials that provide excellent resistance against environmental leakage (zero environmental leakage) without the health hazards associated with asbestos type gaskets. All are available as either “E” or “F” type gaskets in isolating retainer materials.

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