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PSI
LineBacker®
61™
NSF Certified
Sealing & Isolating Gasket
For potable Water. Meets all criteria
associated with NSF health
effects testing, certification and production facility inspections.
Benefits / Features
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Eliminates flange leaks.
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Guards
against blowouts.
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Usable
with any type of flange or combination of flanges.
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Lowest
possible clamp and compressive load to effect a seal.
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Insulating version is both a positive seal and a superior
isolator.
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High
dielectric strength.
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Water
absorption less than 0.10%.
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All
standard ANSI and API flange sizes from 1/2" and above.
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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. PSI’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.
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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. |
Physical
Properties
Retainer Physical
Properties
|
ASTM |
TEST METHOD |
G-10 EPOXY GLASS |
|
D149 |
Dielectric Strength,
Volts/Mil (Short Time) |
550 |
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D695 |
Compressive Strength (psi) |
50,000 |
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D229 |
Water Absorbtion (%) |
0.10 |
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D257 |
Insulation Resistance
(Meg Ohms) |
200,000 |
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D790 |
Flexural Strength (psi) |
60,000 |
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D785 |
Hardness Rockwell "M" |
115 |
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D256 |
IZOD Impact Strength
(Ft-Lbs/Inch) |
14.0 |
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D638 |
Tensile Strength (psi) |
45,000 |
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D732 |
Shear Strength (psi) |
22,000 |
| |
Temperature Range |
Cryogenic to +280°F
(+138°C) |
Seal Element Physical
Properties
|
Temperature Range |
EPDM |
|
Temperature Range |
-65 to +300°F (-54 to
+149°C) |
Sleeve Material Physical
Properties
|
ASTM |
TEST METHOD |
G-10 EPOXY GLASS |
| D149 |
Dielectric Strength,
Volts/Mil (Short Time) |
400 |
| D695 |
Compressive Strength (psi) |
N/A |
| D229 |
Water Absorbtion (%) |
0.10 |
| D790 |
Flexural Strength (psi) |
55,000 |
| |
Cut-through resistance
(ft-lbs) |
16,000 |
| |
Operating temperature |
Cryogenic to +280°F
(+138°C) |
1/8" Washer Material
Physical Properties
|
ASTM |
TEST METHOD |
G-10 EPOXY GLASS |
| D149 |
Dielectric Strength,
Volts/Mil (Short Time) |
550 |
| D695 |
Compressive Strength (psi) |
50,000 |
| D229 |
Water Absorbtion (%) |
0.10 |
| |
Operating temperature |
Cryogenic to +280°F
(+138°C) |
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Potable Water Flange Isolation Kit
PSI 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.
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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.
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