Title:
THREADED CONNECTION FOR INTERNALLY CLAD PIPE
Document Type and Number:
WIPO Patent Application WO1999043974
Kind Code:
A9
Abstract:
A corrosion-resistant threaded connection including a first tubular member having an outer metal tube (12) of corrosion-prone material and an inner metal lining (38) of corrosion-resistant material, the first tubular member (12) forming a pin connection (12a) having a nose portion comprising a ring (40) of corrosion-resistant material secured, e.g., welded (42), to the tube (12) of corrosion-prone material, a radially outwardly facing, annularly extending thread-free first pin shoulder (44) being formed on the corrosion-resistant ring, the first member including an externally threaded portion (48) providing male threads, and a second tubular member (14) comprising a metal coupling having a first end (16) and a second end (20) and forming a first box connection and a second box connection, respectively, the coupling including an internally disposed annularly extending metal section of corrosion-resistant material (24) disposed intermediate the ends (16, 20) of the coupling, each of the box connections comprising a radially inwardly facing annularly extending box shoulder (28) formed on the section of corrosion-resistant material (24).
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Inventors:
DELANGE RICHARD W
HASHEM GHAZI J
HASHEM GHAZI J
Application Number:
PCT/US1999/003974
Publication Date:
November 11, 1999
Filing Date:
February 24, 1999
Export Citation:
Assignee:
GRANT PRIDECO INC (US)
International Classes:
E21B17/042; E21B17/08; F16L15/08; F16L58/18; (IPC1-7): F16L9/14; F16L15/00
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