Pipe joints or couplings – With assembly means or feature – Molded joint facilitator
Patent
1996-04-19
1998-03-24
Arola, Dave W.
Pipe joints or couplings
With assembly means or feature
Molded joint facilitator
285 212, 285 213, 285 55, 285 93, 285369, 2853822, 285906, 285915, 29458, 2989014, F16L 1302
Patent
active
057304726
DESCRIPTION:
BRIEF SUMMARY
The subject invention pertains to a flangeless pipe joint. The subject invention further pertains to a process for manufacturing a flangeless pipe joint.
Currently available and well known plastic-lined piping products comprise a family of pipes, fittings, and valves especially designed for handling corrosive or high purity liquids. Such products generally comprise steel lined with a polymeric material. Such materials include, but are not limited to polyvinylidene chloride, polypropylene, polyvinylidene fluoride, perfluoroalkoxy copolymer, fluorinated ethylene-propylene copolymer, ethylene trifluoroethylene, ethylchlorotrifluoroethylene, and polytetrafluoroethylene. Such products enjoy both the structural integrity of steel and the high chemical resistance characteristic of the selected polymeric liner.
Typically, each pipe, fitting, valve, etc. will typically contain a flange at or substantially near each end thereof. Adjacent pipes, fittings, valves, etc., within a given pipeline may be joined one to another by the fastening together of such flanges, e.g., by bolting.
While flanged joints are acceptable in most applications, advantage could be had in flangeless joints. Such joints could be constructed to be fluid-proof and vapor-proof, to decrease (if not eliminate) fugitive emissions through the joints. Moreover, such joints would be less bulky than flanged joints, which would make their enclosure within secondary containment systems less unwieldy
U.S. Pat. No. 4,780,163 provides a method of sliplining pipe to form a pipeline having flangeless joints. In particular, a section of pipe is cut to form two pieces and a cutout portion, such that the point of the cut forms a closure point. Polymeric liner segments are then drawn through each of the two pieces and extend beyond the ends of the pipe to the closure point. Then, the liner segments are fused at the closure point, the liner segments are insulated at the point of fusion, and the cut out portion is welded to the pieces to form a continuous piece of pipe. The patent requires that a heat shield-insulation material be wrapped around the fused liner segments between the fused liner segments and the cutout portion of the pipe Such heat shield-insulation material may be used due to the relatively large gap that exists between the outer surface of the liner and the inner surface of the pipe segment, characteristic of sliplined pipe.
U.S. Pat. No. 5,127,116 discloses a joint for pipes, each of which contains a polyolefin liner, comprising two pipe end portions spaced apart with their liners protruding from the end portions and joined by joining means (such as electrofusion), a shell interconnecting the pipe end portions, and grout in the space between the liners and the shell. The disclosed joint is disadvantageous, in that the necessity of grout increases the bulk of the joint. The disclosed joint is further disadvantageous, it that is does not have leakage detection capabilities. The disclosed joint is further disadvantageous, in that it does not provide a system wherein the liner is retained between the first and second sections of pipe at the point of the joining means in a manner which restrains linear movement of the liners.
Industry would find advantage in flangeless joints for plastic-lined pipe systems. In particular, the industry would find advantage in flangeless joints for plastic-lined pipe systems, wherein adjacent liners are joined together by joining means other than compressive force, such as to form a fluid- and vapor-tight seal between adjacent liners. Industry would further find advantage in a flangeless joint, wherein the linear movement of a polymeric liners is restrained, such as during thermal cycling. Industry would further find advantage in a flangeless joint equipped with a secondarily contained leak detection zone for detecting leaks in the joining means.
Accordingly, the subject invention provides a flangeless pipe joint for polymer-lined pipe comprising: of pipe being lined with a first polymeric liner having a first liner end e
REFERENCES:
patent: 3047937 (1962-08-01), Vecchi
patent: 3498648 (1970-03-01), Hallesy
patent: 3563573 (1971-02-01), Crompton
patent: 3606659 (1971-09-01), Robbins
patent: 4277091 (1981-07-01), Hunter
patent: 4295669 (1981-10-01), LaPrade et al.
patent: 4614369 (1986-09-01), Overath
patent: 4662655 (1987-05-01), Fliervoet et al.
Huggard Dennis A.
Jeglic Michael F.
Krause Brian W.
Arola Dave W.
The Dow Chemical Company
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