US 11,731,210 B2
Long steel pipe for reel-lay installation and method for producing the same
Teruki Sadasue, Tokyo (JP); Tsunehisa Handa, Tokyo (JP); and Yoshiaki Murakami, Tokyo (JP)
Assigned to JFE STEEL CORFORATION, Tokyo (JP)
Appl. No. 17/279,218
Filed by JFE Steel Corporation, Tokyo (JP)
PCT Filed Sep. 24, 2019, PCT No. PCT/JP2019/037380
§ 371(c)(1), (2) Date Mar. 24, 2021,
PCT Pub. No. WO2020/067064, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 2018-184770 (JP), filed on Sep. 28, 2018; and application No. 2018-184771 (JP), filed on Sep. 28, 2018.
Prior Publication US 2022/0032391 A1, Feb. 3, 2022
Int. Cl. F16L 13/02 (2006.01); B23K 11/093 (2006.01); F16L 9/02 (2006.01); B23K 103/04 (2006.01); B23K 101/10 (2006.01); F16L 9/22 (2006.01)
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
OG exemplary drawing
 
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.