PSI LineBacker® Sealing and Isolating Gasket
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.
Benefits, Features, Sizes, and Ratings
Benefits and Features
- 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 isolator.
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.
Available Options
| Metal Retainer Materials |
Insulating Retainer Materials |
Sealing Elements |
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|---|---|---|---|---|
| Aluminum | Ceramic | Buna-N(Nitrile) | ||
| Brass | Epoxy Glass | Buna-S | ||
| Carpenter 20 | Glass | Butyl | ||
| Carbon Steel | Lucite | EPDM | ||
| Cast Iron | Melamine | Hypolon | ||
| Clad Steel Materials | Phenolic | Kel-F | ||
| Copper | Polyester Glass | Natural Rubbers | ||
| Ductile Iron | Polyethylene | Neoprene | ||
| Hastelloy B | Polyphenol Ether | Nylon | ||
| Hastelloy C | Pyrox | Polimide | ||
| Hastelloy X | Silicone Glass | Polyurethane | ||
| Inconel X | Vinl | Silicone Rubber | ||
| Monel | Teflon® | |||
| Nickel 200 | Vinyl | |||
| Soft Iron | Viton® | |||
| Stainless Steel | ||||
| Tantalum | ||||
| Tin | ||||
| Titanium | ||||
| Vanadium |
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. |
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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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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. |
The gasket retainer extends out to the I.D. of the bolt circle. |
| ASTM | Test Method |
G-10 Epoxy Glass |
|---|---|---|
| D149 | Dielectric Strength Volts/Mil (Short Term) |
800 |
| D695 | Compressive Strength (psi) |
69,000 |
| D229 | Water Absorption (percent) |
0.04 |
| D257 | Insulating Resistance Meg Ohms |
300,000 |
| D790 | Flexural Strength (psi) |
65,000 |
| D256 | IZOD Impact Strength (Ft. Lbs./In.) |
26 |
| D638 | Tensile Strength (psi) |
51,000 |
| D732 | Shear Strength (psi) |
21,000 |
| Temperature Range | ||
| Cryogenic to +302°F | Cryogenic to +150°C | |
| Seal Element Temperature Range PTFE (Teflon) | ||
| Cryogenic to +450°F | Cryogenic to +232°C | |
| Seal Element Temperature Range Vitron | ||
| -20 to +350°F | -29 to +177°C | |
| TEST | LinkSeal™ Value |
|---|---|
| Compression Test EN 13555 @150® |
140 Mpa Gasket Stress |
| Creep Relaxation EN 13555 @150® |
|
| Leakage Test EN 13555 @ 40 bar Helium @5Mpa to 80 Mpa gasket stress |
0.99 Relaxation Factor |
| Hot Blowout Test HOBT@151®C @ 165 bar |
No Blowout |
| Shell Leakage Test T-2.232686 @ ambient @ 52Mpa |
4.2 X 10-7 pa-m3/s/mm |
| Shell Cycle Test T-2.232686 @ 150® @ 45.6Mpa |
<0.10 bar pressure loss |
| Medium | Retainer | Seal | Temp. Range °F | Temp. Range °C |
|---|---|---|---|---|
| Carbon Dioxide | G-10 | Teflon | -65 to +250 | -54 to +121 |
| Vitron | -20 to +280 | -29 to +138 | ||
| Diesel Fuel | G-10 | Teflon | -65 to +250 | -54 to +121 |
| Vitron | -20 to +280 | -29 to +138 | ||
| Ethanol | G-10 | Teflon | -65 to +250 | -54 to +121 |
| Vitron | -20 to +280 | -29 to +138 | ||
| Fuel Oil | G-10 | Teflon | -65 to +250 | -54 to +121 |
| Vitron | -20 to +280 | -29 to +138 | ||
| H2S | G-10 | Teflon | -65 to +250 | -54 to +121 |
| Gas, Natural | G-10 | Teflon | -65 to +250 | -54 to +121 |
| Vitron | -20 to +280 | -29 to +138 | ||
| Gas, Sweet | G-10 | |||
| Vitron | -20 to +220 | -29 to +138 | ||
| Gas, Sour CO2 Mix | G-10 | Teflon | -65 to +250 | -54 to +121 |
| Jet Fuel | G-10 | Teflon | -65 to +250 | -54 to +121 |
| Vitron | -20 to +280 | -29 to +138 | ||
| Nitrogen | G-10 | Teflon | -65 to +250 | -54 to +121 |
| Vitron | -20 to +280 | -29 to +138 | ||
| Oil, Crude | G-10 | Teflon | -65 to +250 | -54 to +121 |
| Vitron | -20 to +280 | -29 to +138 | ||
| Propane | G-10 | Teflon | -65 to +250 | -54 to +121 |
| Vitron | -20 to +280 | -29 to +138 | ||
| Propylene | G-10 | |||
| Vitron | -20 to +80 | -29 to +27 | ||
| Sewage | G-10 | Teflon | -65 to +250 | -54 to +121 |
| Vitron | -20 to +280 | -29 to +138 | ||
| Water (Hot) | G-10 | Teflon | -65 to +250 | -54 to +121 |
| Vitron | -20 to +280 | -29 to +138 | ||
| Water (Sea) | G-10 | Teflon | -65 to +250 | -54 to +121 |
| Vitron | -20 to +280 | -29 to +138 | ||
| 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 or PSI factory for specific applications. PSI’s responsibilities will be limited to those listed in the PSI standard warranties. |
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How to Order
To order LineSeal™ Sealing/Isolating Gaskets please indicate the following:
- Quantity
- Nominal Pipe Size
- Pressure Rating
- Gasket Type: E or F
- Gasket Style: LineSeal™
- Retainer Material
- Sealing Element
- Weld neck or slip-on application
- Note all special requirements.
Warranty
Manufacturer’s warranty statement will be supplied upon request to Allied Corrosion Industries, Inc.
Typical Specifications
All Critical Service Applications
Materials for sealing gaskets on pipes containing water, aqueous fluids, oil, sour or natural gas (up to 302®F, 150®C) shall consist of the following components:
Isolating and Sealing Gasket
One isolating and sealing gasket, LineSeal Type “F”, 0.27 inch thick, 316 stainless steel core retainer laminated on both sides with a G-10 fiber glass reinforced laminate containing a precision tapered groove to accommodate the controlled compression of a PTFE(Teflon) spring energized seal. Sealing element placement shall accommodate either flat, raised or RTJ face flanges. The spring energized seal shall be pressure energized. The G-10 retainer shall have a 800 volts/mil dielectric strength and a minimum 69,000 psi compressive strength. The I.D. of the flange isolating gasket shall match the bore of the flange in which it is installed.
Quality
Gaskets shall be manufactured at a facility that has a registered ISO 9001:2008 Quality Management System.
Submittals shall include copy of valid registration. Performance suitability and material compatibility shall be determined by the user.
Availability
Gaskets shall be manufactured by PSI-Pipeline Seal and Insulator, Inc., Houston, Texas, U.S.A.
Telephone: 713-747-6948
Facsimile: 713-747-6029
www.pipelineseal.com.
e-mail: info@psipsi.com
Alternate products should be submitted to an engineer 10 days prior to bid due date.
Sealing and Isolating Gaskets
Two of PSI’s premier sealing gaskets are available with isolating retainers. Both LineBacker? and GasketSeal? gaskets may be ordered with isolating retainers to match your application. In addition, you may choose from a wide variety of sealing elements so your completed gasket will consist of a combination of the best materials to seal the flange and maintain that seal for the life of the piping system.
