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Transform any non-leaking coupling into a Restraint Coupling without removing it from the pipe and without welding
or shutting down a live pipeline.
- Prevents coupling pull-out.
- Fast and simple installation by your own crews.
- Superior, economical alternative to welding or pipeline cut-outs.
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The coupling and pipe ends are now permanently bonded together to make a fully restrained joint that will never let go of
the pipe.
All sizes meet all CFR 192 requirements for pullout and are designed at a minimum of 3 times the pullout rating of a standard restraint coupling. The finished encapsulation is rated for natural gas at 400 psig. (Scroll down to view test results. Full report available on request.)
Tensile-Max is one of the strongest polyurethane resins in the world. It is a derivative of PLCS Series 6,
a polyurethane used on millions of successful gas main encapsulations for over 25 years. Series 6 has passed
National Grid/British Gas LC8 and US specifications and is the gold standard encapsulation method for leak
sealing, used by gas companies around the world.
Installation
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Grit Blast and Prime
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Fitting Mold
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Filling Mold with Resin
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Completed Restraint
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PLCS Coupling Restraint System Test Results
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Test
Dielectric Strength
Tensile Strength
Elongation at break
Abrasion Resistance (TABER H22)
Hardness
Bond to Steel Pipe
Pressure test to failure
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Test-Max results
559kV per inch
3000 psi
25%
0.007 ounces loss after 1000 cycles
70 Shore "D"
Excellent
1,200 psi
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Size of Coupling
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Minimum Failure
In pounds force
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Max Pullout Resistance of
Dresser restraint coupling
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3 inch
4 inch
6 inch
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42,000 lbs
45,145 lbs
66,071 lbs
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13,000 lbs
14,000 lbs
22,000 lbs
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Encapsulated couplings ready for test.
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Coupling in tensile pulling machine.
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1-1/4" steel bar broke at 108,071 lbf.
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Steel bar broke before pipe pulled out.
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