1550 Cobb Industrial Dr. | P.O. Box 9098 | Marietta, GA 30065-2098
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PSI LineBacker® 61™ Sealing and Isolating Gasket
Description
LineBacker® 61™ 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 for all types of applications. Used and proven, for over 40 years, in the water and energy industry’s – LineBacker® gaskets have been effectively sealing flanges within piping systems carrying potable water and other fluids in high/low temperature extremes – at high pressure ratings.
Of particular importance with respect to NSF/ANSI Standard 61, is the micro-exposure of the sealing element (EPDM) within the G-10 Epoxy Glass retainer material. In addition to providing positive sealing characteristics relative to the fluid flowing within the pipe, the seal element is also protected from deterioration by atmospheric conditions which dramatically lengthens the service life of the gasket. NSF/ANSI Standard 61 establishes minimum health effects requirements for the chemical contaminants and impurities that may be indirectly imparted to drinking water.
The LineBacker® 61™ Sealing/Isolating gasket meets all criteria associated with NSF health effects testing, certification and production facility inspections. PSI’s registration confirms that NSF has assessed and certified the LineBacker® 61™ as conforming with the relevant NSF standards.
Benefits and Features
- Eliminates Flange Leaks.
- Guards against blowouts.
- Usable with any type of flange.
- Lowest possible clamp and compressive load to effect a seal.
- Insulating version is both a positive seal and a superior insulator.
- High dielectric strength
- Water absorption less than 0.10%.
- All standard ANSI and API flange sizes from 1/2″ and above.
- Temperature Range: Cryogenic to +280°F. (+138°C.)
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.
After Tightening portion of the groove, developing a high unit pressure against the flange faces.
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.
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.
Potable Water Flange Isolation Kit
PSI suggested washer and sleeve material to complement your NSF 61 Flange Kit Application.
G-10 1 PC Sleeve and Washer Sets
One-piece sleeve and washer sets include the following items for each bolt:
- One 1/8 inch thick steel washer
- One 1/8 inch thick G-10 washer
- One G-10 isolating sleeve
Completely assembled, easier to install, 1 PC sleeves also allow the inspector a visual indication of sleeve usage.
| 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 |
| D785 | Harness Rockwell “M” |
115 |
| D256 | IZOD Impact Strength (Ft. Lbs./In.) |
26 |
| D638 | Tensile Strength (psi) |
51,000 |
| D732 | Shear Strength (psi) |
21,000 |
| Temperature Range G-10 Epoxy Glass | ||
| Cryogenic to +302°F | Cryogenic to +150°C | |
| Seal Element Temperature Range EPDM | ||
| -65 to +300°F | -54 to +149°C | |
| ASTM | Test Method |
G-10 Epoxy Glass |
|---|---|---|
| D149 | Dielectric Strength Volts/Mil (Short Term) |
800 |
| D695 | Compressive Strength (psi) |
N/A |
| D229 | Water Absorption (percent) |
0.04 |
| D790 | Flexural Strength (psi) |
65,000 |
| Cut Through Resistance ft. lbs. | 16,000 | |
| Operating Temperature | ||
| Cryogenic to +302°F | Cryogenic to +150°C | |
| 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 |
| Operating Temperature | ||
| Cryogenic to +302°F | Cryogenic to +150°C | |
How to Order
To order LineBacker® 61™ Sealing/Isolating Gaskets please indicate the following:
- Quantity
- Nominal Pipe Size
- Pressure Rating
- Gasket Type: E or F
- Gasket Style: LineBacker® 61™
- Retainer Material: G-10 Epoxy Glass
- Sealing Element: EPDM
- 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
NSF 61 Flange Gasket Specification
Materials for flange isolation kits on pipes containing drinking/potable water (up to 280°F, 138°C) shall consist of the following components:
Isolating and Sealing Gasket
The full faced, NSF 61 certified, isolating and sealing gasket shall be LineBacker® 61™ Sealing Gasket (LB61) – Type “E”, 1/8 inch thick, G-10 retainer containing a precision tapered groove to accommodate the controlled compression of a EPDM quad-ring sealing element. Sealing element placement shall accommodate either flat, raised face or RTJ flanges. The quad-ring seal shall be pressure energized. The G-10 retainer shall have a 550 volts/mil dielectric strength and a minimum 50,000 psi compressive strength. The full faced flange isolating gasket (weld-neck) shall be equal to or slightly smaller than the bore of the flange; (slip-on) shall be equal to or smaller than the I.D. of mating pipe.
Availability
Kits 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.
Performance suitability and material compatibility shall be determined by the user.
Full Length Bolt Isolating Sleeves
One full length G-10 sleeve (extending half way into both steel washers) for each flange bolt. The G-10 sleeve shall be a 1/32 inch thick tube with a 800 volts/mil dielectric strength and water absorption of 0.04% or less.
Washers
Two, 1/8 inch thick, G-10 isolating washers for each bolt. Their compressive strength shall be 69,000 psi, dielectric strength 550 volts/mil and water absorption 0.04% or less. Two, 1/8 inch thick zinc plated, hot rolled steel washers for each bolt. The I.D. of all washers shall fit over the isolating sleeve and both the steel and isolating washers shall have the same I.D. and O.D.
Quality (Made in U.S.A – A.R.R.A Complaint)
Flange isolating kits shall be manufactured at a facility that has a registered ISO 9001:2008 Quality Management System. Submittals shall include copy of valid ISO registration and NSF 61 certification.