Corrosion-resistant pipe coupling structures
First Claim
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1. A corrosion-resistant pipe coupling structure comprising:
- a tubular coupling member including an inner surface and axially opposite ends having internal screw threads for engaging male screw threads provided on axially opposing end parts of two pipes to be coupled, the internal surfaces of each of the pipes being lined with material resistant to corrosive fluids;
an unthreaded intermediate annular projection formed integrally with said inner surface of said coupling member and directed radially inward thereof to be abuttingly engaged by the opposing radial end surfaces of the pipes;
an annular member made of a corrosion-resistant material which is initially separate from said annular projection and welded thereto to be engaged by the opposing radial end surfaces of the pipes lined with said material;
the radially innermost surface of said annular projection forming a tapered bore; and
said annular member having a conical outer surface shaped complementarily to said tapered bore, whereby said annular member can be friction-welded to said annular projection by inserting said annular member into said tapered bore and thrusting it axially of said bore while rotating said annular member into frictional sliding contact with said surface of said bore.
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Abstract
A corrosion-resistant pipe coupling made of carbon steel has on its inner surface an intermediate annular projection directed radially inward. At least an innermost part of the annular projection is formed or corrosion-resistant material such as stainless steel. The annular projection is covered by a corrosion-resistant annular member or which is secured by friction welding, electron beam welding, an adhesive or mechanical engagement. The annular member prevents corrosion of the coupling by corrosive fluids flowing in pipes.
53 Citations
1 Claim
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1. A corrosion-resistant pipe coupling structure comprising:
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a tubular coupling member including an inner surface and axially opposite ends having internal screw threads for engaging male screw threads provided on axially opposing end parts of two pipes to be coupled, the internal surfaces of each of the pipes being lined with material resistant to corrosive fluids; an unthreaded intermediate annular projection formed integrally with said inner surface of said coupling member and directed radially inward thereof to be abuttingly engaged by the opposing radial end surfaces of the pipes; an annular member made of a corrosion-resistant material which is initially separate from said annular projection and welded thereto to be engaged by the opposing radial end surfaces of the pipes lined with said material; the radially innermost surface of said annular projection forming a tapered bore; and said annular member having a conical outer surface shaped complementarily to said tapered bore, whereby said annular member can be friction-welded to said annular projection by inserting said annular member into said tapered bore and thrusting it axially of said bore while rotating said annular member into frictional sliding contact with said surface of said bore.
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Specification
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Current AssigneeKawasaki Jukogyo Kabushiki Kaisha
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Original AssigneeKawasaki Jukogyo Kabushiki Kaisha
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InventorsYoshida, Toshio, Atsuta, Toshio, Matsui, Shigetomo, Itoga, Kouyu
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Primary Examiner(s)Callaghan, Thomas F.
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Application NumberUS06/358,801Time in Patent Office1,120 DaysField of Search285/55, 285/383, 285/329, 285/286US Class Current285/55CPC Class CodesF16L 58/182 for screw-threaded joints i...
