Pipe joints or couplings – With casing – lining or protector – Insulated
Patent
1995-04-12
1997-06-03
Arola, Dave W.
Pipe joints or couplings
With casing, lining or protector
Insulated
285 55, 285 211, 285286, 285294, 285297, 2853824, 285383, 156158, 156165, 156294, 264269, 264152, F16L 1112
Patent
active
056346727
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. The subject invention further pertains to an apparatus for bulging the end of a polymer-lined pipe. The subject invention further pertains to a process for bulging the end of a polymer-lined pipe.
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.
Plastic-lined pipe typically falls into one of two categories: transfer pipe and process pipe. Transfer pipe refers to pipe typically located beneath the ground for the transfer of a material long distances, from one location to another. Transfer pipe is typically prepared by slip lining, wherein a polymeric liner is pulled through an installed pipe and retained within such pipe only at the points of joinder between adjacent pipe segments, each pipe segment being hundreds of feet long. Typically, the outside diameter of the liner is up to about 10 percent less than the inside diameter of the pipe segments, causing a significant gap between the liner and the inner wall of the pipe. As transfer pipe is not typically subjected to thermal cycling, the relatively large gap between the liner and the inner wall of the pipe is not problematic.
Process pipe typically falls into one of three subcategories: loose-lined pipe, interference fit pipe, and swaged pipe. In contrast to transfer pipe, process pipe typically comprises shorter pipe segments, on the order of about twenty feet and less. Further, process pipe is typically characterized by an outside liner diameter which is at least about 97 percent of the inside diameter of the pipe segments.
Loose-lined pipe is characterized by a polymeric liner retained within a pipe only at the points of joinder between adjacent pipe segments, wherein the outside liner diameter is at least about 97 percent of the inside diameter of the pipe segment. Loose-lined pipes are typically manufactured by slipping a pre-formed polymeric liner into a flanged pipe segment, flaring the liner over the structurally rigid flange face, and bolting the flange to an adjacent flange. In loose-lined pipe, the liner is thus retained within the pipe segment by the compressive force exerted on the flared portion of the liner at the flange face. Loose-lined pipe is generally sold as its components, e.g., as pipe segments, polymeric liners, and flanges. In the field, the liner may be inserted into the flanged pipe segment, and may be flared as described above. Suppliers for loose-lined pipe components include Crane-Resistoflex Co. (Marion, N.C.), and Performance Plastic Products (Houston, Tex.).
Interference fit pipe, which is also known as reverse swaged pipe, is characterized by a zero tolerance fit between the polymeric liner and the pipe segments. Interference fit plastic-lined pipe is typically formed by compressing a preformed polymeric liner having an outer diameter greater than the inner diameter of the pipe segment by passing it through a sizing die, and inserting the compressed liner into the pipe segment before the liner expands. Upon the release of the force by which the liner is pulled through the pipe, the memory of the plastic causes the liner to exert force upon the inner wall of the pipe segment, serving to assist in retaining the liner within the pipe segment. Due to the special apparatus required to achieve the interference fit relationship, interference fit pipe is generally available as p
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Jeglic Michael F.
Stack Eugene V.
Arola Dave W.
The Dow Chemical Company
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