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AssigneeJfe Steel Corforation
InventorsTeruki Sadasue, Tsunehisa Handa, Yoshiaki Murakami
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A long steel pipe for reel-lay installation formed of electric resistance welded (ERW) steel pipes and having high buckling resistance and a method for producing the long steel pipe for reel-lay installation are provided. The long steel pipe is formed by successively butt-joining longitudinal ends of the ERW steel pipes by girth welding so that girth welds are formed. The ERW steel pipes are successively butt-joined in the pipe longitudinal direction such that the 0 o'clock cross-sectional position or the 6 o'clock cross-sectional position of one of adjacent ERW steel pipes faces an area from the 2 o'clock cross-sectional position to the 4 o'clock cross-sectional position or an area from the 8 o'clock cross-sectional position to the 10 o'clock cross-sectional position of the other of the adjacent ERW steel pipes.
A long steel pipe for reel-lay installation comprising a plurality of electric resistance welded steel pipes joined in a pipe longitudinal direction with a girth weld provided therebetween, wherein the plurality of electric resistance welded steel pipes include adjacent electric resistance welded steel pipes that are adjacent to each other, a seam position of one of the adjacent electric resistance welded steel pipes being defined as a 0 o'clock cross-sectional position and positions that evenly divide a pipe cross section of other of the adjacent electric resistance welded steel pipes into 12 sections around a pipe axis being defined as the 0 o'clock cross-sectional position to an 11 o'clock cross-sectional position in a clockwise order, and wherein the plurality of electric resistance welded steel pipes are joined such that the 0 o'clock cross-sectional position of the one of the adjacent electric resistance welded steel pipes faces an area from the 2 o'clock cross-sectional position to the 4 o'clock cross-sectional position or an area from the 8 o'clock cross-sectional position to the 10 o'clock cross-sectional position of the other of the adjacent electric resistance welded steel pipes.
A long steel pipe for reel-lay installation comprising a plurality of electric resistance welded steel pipes joined in a pipe longitudinal direction with a girth weld provided therebetween, wherein the plurality of electric resistance welded steel pipes include adjacent electric resistance welded steel pipes that are adjacent to each other, a seam position of one of the adjacent electric resistance welded steel pipes being defined as a 0 o'clock cross-sectional position and positions that evenly divide a pipe cross section of other of the adjacent electric resistance welded steel pipes into 12 sections around a pipe axis being defined as the 0 o'clock cross-sectional position to an 11 o'clock cross-sectional position in a clockwise order, and wherein the plurality of electric resistance welded steel pipes are joined such that the 6 o'clock cross-sectional position of the one of the adjacent electric resistance welded steel pipes faces an area from the 2 o'clock cross-sectional position to the 4 o'clock cross-sectional position or an area from the 8 o'clock cross-sectional position to the 10 o'clock cross-sectional position of the other of the adjacent electric resistance welded steel pipes.
Dependencies are inferred from the claim text.