Pipes and tubular conduits – Flexible – Spirally wound material
Patent
1976-04-28
1979-09-18
Smith, Robert I.
Pipes and tubular conduits
Flexible
Spirally wound material
138174, F16L 904, F16L 1111
Patent
active
041679539
ABSTRACT:
A reinforced tube or a tubular pipe comprises an inner tubular first layer of glass fiber reinforced plastic, an outer tubular second layer disposed around and spaced radially outwardly from the first layer and also comprising a glass fiber reinforced plastic, and an intermediate filler layer located between the first and second layers and containing plastic and granular filler material which is bonded together and to said first and second layer. In addition a reinforcing insert is embedded in the intermediate filler layer and it comprises a continuous coil wound around the first layer and embedded in the intermediate layer. The coil may comprise a fiber reinforced plastic coil or a steel wire coil and a single one or two concentrically arranged coils may be embedded in the filler layer. The filler layer comprises plastic bonded granular material such as plastic and sand or an insulating material which may be made of an epoxy or a diphenyl polyester resin. The tube is advantageously made up in sections in which the inner layer is of greater axial elongation than the intermediate or outer layers and it may be abutted against another section and held to the other section by a surrounding sleeve having a central portion comprising inner and outer layers with an intermediate layer which fit in between the intermediate layers and outer layers of the adjacent sections and engage against the inner layer of the adjacent sections in sealing engagement with sealing rings disposed therebetween.
REFERENCES:
patent: 3338271 (1967-08-01), Plummer et al.
patent: 3532132 (1970-10-01), Rubienstein
Hobas Engineering AG, S.A. Ltd.
Smith Robert I.
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