CPC B23K 11/0935 (2013.01) [F16L 9/02 (2013.01); F16L 13/02 (2013.01); B23K 2101/10 (2018.08); B23K 2103/04 (2018.08); F16L 9/22 (2013.01)] | 12 Claims |
1. 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.
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