Pipe joints or couplings – For branched path – T-type
Patent
1991-02-04
1992-08-25
Taylor, Dennis L.
Pipe joints or couplings
For branched path
T-type
285189, 405 52, 405128, F16L 2100
Patent
active
051412608
ABSTRACT:
A double-containment thermoplastic pipe assembly provides for transfer of differential thermal expansion forces to rigid external supports. The assembly includes a flanged restraint coupling having an inner carrier pipe portion, an outer containment pipe portion, a wall connecting the inner and outer pipe portions, and a radially extending flange around the outside of the containment pipe portion. The flange is secured to an external support such as a manhole for underground system by being cast into the wall of a cast-in-place manhole or by being engaged by rings on each side of the flange for precast manhole systems. The outer pipe terminates at the manhole wall so that the containment function within the manhole is performed by the manhole inself. For above-ground applications, the coupling is secured by engagement of the flange with a cast concrete wall or metal saddle connected to an underground footing. Both containment and carrier pipes are connected to each end of the coupling for the latter applications. Rigid spacers are placed between the two pipes along its length to provide for controlled flexing of the carrier pipe upon undergoing thermal expansion. The invention is particularly useful for polyethylene pipes and for later diameter pipes.
REFERENCES:
patent: 3246917 (1966-04-01), Martin
patent: 3351361 (1967-11-01), Martin
patent: 3759280 (1973-09-01), Swanson
patent: 3759285 (1973-09-01), Yoakum
patent: 4103901 (1978-08-01), Ditcher
patent: 4786088 (1988-11-01), Ziv
patent: 4976457 (1990-12-01), Carter
Fluid Controls Inc.
Taylor Dennis L.
LandOfFree
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