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Usable with any type of flange or combination of flanges.
Lowest possible clamp and compressive load to effect a seal.
Insulating version is both a positive seal and a superior isolator.
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.)
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 for all types of applications. Used and proven, for over 40 years, in the water and energy industries, LineBacker® gaskets have been effectively sealing flanges within piping systems carrying potable water and other fluids at high/low temperature extremes and 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 LinkBacker® 61™ Sealing/Isolating gasket meets all criteria associated with NSF health effects testing, certification and production facility inspections. GPT’s registration confirms that NSF has assessed and certified the LineBacker® 61™ as conforming with the relevant NSF standards. For more information regarding NSF, visit www.nsf.org.
Before Tightening The sealing elements 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.
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.
GPT suggested washer and sleeve material to complement your NSF 61 Flange Kit Application. Completely assembled, easier to install, 1-piece sleeves also allow the inspector a visual indication of sleeve usage.
G-10 1-PC Sleeve and Washer Sets:
1 PC sleeve and washer sets include the following items for each bolt: one 1/8” thick steel washer, one 1/8” thick G-10 Washer, one G-10 Isolating Sleeve.
NSF 61 Flange Isolation Kit Specification
Materials for flange isolation kits on pipes containing drinking/potable water (up to 280ºF, 138ºC) 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” 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.
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 shall be a 1/32 inch thick tube with a 400 volts/mil dielectric strength and water absorption of 0.10% or less.
Washers Two, 1/8 inch thick, G-10 isolating washers for each bolt. Their compressive strength shall be 50,000 psi, dielectric strength 550 volts/mil and water absorption 0.10% 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 a same I.D. and O.D.
Quality (Made in USA - ARRA Complaint) Flange isolating kits shall be made in USA and shall be ARRA compliant. They 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.
Availability Kits shall be manufactured by PSI-Pipeline Seal and Insulator, Inc., Houston, Texas, U.S.A.
