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US 4,402,346 AGranted
Crude oil pipe having layers of graduated permeability to hydrogen sulfide
AssigneeDunlop Limited
InventorsIvan C. Cheetham, Jack M. Lowe, Glyn H. Redmond
Life of this patent
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AssigneeDunlop Limited
InventorsIvan C. Cheetham, Jack M. Lowe, Glyn H. Redmond
Estimating the term…
A pipe for transporting crude oil comprises a layer of polymeric material for containing oil within the bore of the pipe, the polymeric material being surrounded and supported by a reinforcement structure comprising high tensile reinforcement elements which are protected from corrosion by gases passing from the polymeric layer through the reinforcement structure. The reinforcement element may be provided with a protective sheath, for example of low permeability material or a material which possesses electrolytic action, or the reinforcement element may be embedded in a matrix of high permeability material such that a preferential path is provided for the passage of gases through the reinforcement structure.
A pipe for transporting crude oil therethrough and having a preferential path through the wall of the pipe for passage of a gas emanating from the crude oil, said pipe comprising:
A pipe for transporting crude oil comprising a plurality of superposed annular layers, including an inner layer of polymeric material for containing oil within the bore of the pipe, said inner layer of polymeric material being bound at a radially outer surface by a wrapping layer which restrains radial flow of said polymeric material, and a reinforcement structure for supporting said layer of polymeric material, the reinforcement structure lying radially outwards of the layer of polymeric material and comprising successive axially spaced helical turns of at least one high tensile reinforcement element provided with a protective sheath, the material of said protective sheath having a permeability which is low compared with that of the respective path extending between each of the successive turns from a radially inner to a radially outer surface of the reinforcement structure so as to provide a preferential path for the passage of corrosive gases from the polymeric layer through the reinforcement structure.
A pipe for transporting crude oil comprising a plurality of superposed annular layers, including an inner layer of polymeric material for containing oil within the bore of the pipe, said inner layer of polymeric material being bound at a radially inner surface by a wrapping layer which restrains radial flow of said polymeric material, and a reinforcement structure for supporting said layer of polymeric material, the reinforcement structure lying radially outwards of the layer of polymeric material and comprising successive axially spaced helical turns of at least one high tensile reinforcement element provided with a protective sheath, the material of said protective sheath having a permeability which is low compared with that of the respective path extending between each of the successive turns from a radially inner to a radially outer surface of the reinforcement structure so as to provide a preferential path for the passage of corrosive gases from the polymeric layer through the reinforcement structure.
A pipe for transporting crude oil therethrough and having a preferential path through the wall of the pipe for passage of a gas emanating from the crude oil, said pipe comprising:
A pipe for transporting crude oil therethrough and having a preferential path through the wall of the pipe for passage of a gas emanating from the crude oil, said pipe comprising:
A pipe for transporting crude oil comprising a plurality of superposed annular layers, an inner layer being of polymeric material for containing oil within the bore of the pipe and a reinforcement structure for supporting said layer of polymeric material, the reinforcement structure lying radially outwards of the layer of polymeric material and comprising successive axially spaced helical turns of at least one high tensile reinforcement element provided with a protective sheath, the material of said protective sheath having a permeability which is low compared with that of the respective paths extending between each of the successive turns from a radially inner to a radially outer surface of the reinforcement structure so as to provide a preferential path for the passage of corrosive gases from the polymeric layer through the reinforcement structure, the permeability of said polymeric material sealing layer being lower than the maximum permeability of each of said paths through the reinforcement structure.
Dependencies are inferred from the claim text.