# US 2022/0032391 A1 · Long steel pipe for reel-lay installation and method for producing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0032391 A1 - Document ID: US20220032391A1 - Status: Published application - Kind: A1 - Application number: 17/279,218 - Filed: 2019-09-24 - Published: 2022-02-03 - Earliest claimed: 2018-09-28 - Assignees: Jfe Steel Corporation - Applicants: JFE Steel Corporation - Inventors: Teruki Sadasue; Tsunehisa Handa; Yoshiaki Murakami - Web page: https://patentgrep.com/patent/US20220032391A1 ## CPC - B23K 11/0935: {of tube sections} - B21C 37/08: Making tubes with welded or soldered seams {(with helically arranged seams B21C37/122)} - F16L 9/02: of metal (F16L9/16 - F16L9/22 take precedence) - F16L 13/02: Welded joints - B23K 2101/10: Pipe-lines - B23K 2103/04: Steel {or steel} alloys - F16L 1/16: on the bottom - F16L 1/203: {the pipes being wound spirally prior to laying} - F16L 9/22: Pipes composed of a plurality of segments - B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM - B21C: MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL ## Abstract 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. ## Claims ### Claim 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 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. ### Claim 2 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 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. ### Claim 3 (depends on 1) The long steel pipe for reel-lay installation according to claim 1, wherein one of the adjacent electric resistance welded steel pipes has a tensile strength in a range of 413 MPa to 787 MPa, and other of the adjacent electric resistance welded steel pipes has a tensile strength in a range of 413 MPa to 850 MPa. ### Claim 4 (depends on 3) The long steel pipe for reel-lay installation according to claim 3, wherein a tensile strength of the other of the adjacent electric resistance welded steel pipes at the 3 o'clock cross-sectional position is higher than a tensile strength of the one of the adjacent electric resistance welded steel pipes at the 3 o'clock cross-sectional position by 30 MPa or more. ### Claim 5 (depends on 1) A method for producing the long steel pipe for reel-lay installation according to claim 1 as a steel pipe having a long length, the method comprising: successively joining longitudinal ends of a plurality of electric resistance welded steel pipes by butt girth welding, wherein a seam position of each electric resistance welded steel pipe is defined as a 0 o'clock cross-sectional position, wherein positions that evenly divide a pipe cross section of each electric resistance welded steel pipe into 12 sections around a pipe axis are defined as the 0 o'clock cross-sectional position to an 11 o'clock cross-sectional position in a clockwise order, and wherein the butt girth welding is performed while the longitudinal ends of adjacent electric resistance welded steel pipes are butted against each other such that the 0 o'clock cross-sectional position of 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 other of the adjacent electric resistance welded steel pipes. ### Claim 6 (depends on 2) A method for producing the long steel pipe for reel-lay installation according to claim 2 as a steel pipe having a long length, the method comprising: successively joining longitudinal ends of a plurality of electric resistance welded steel pipes by butt girth welding, wherein a seam position of each electric resistance welded steel pipe is defined as a 0 o'clock cross-sectional position, wherein positions that evenly divide a pipe cross section of each electric resistance welded steel pipe into 12 sections around a pipe axis are defined as the 0 o'clock cross-sectional position to an 11 o'clock cross-sectional position in a clockwise order, and wherein the butt girth welding is performed while the longitudinal ends of adjacent electric resistance welded steel pipes are butted against each other such that the 6 o'clock cross-sectional position of 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 other of the adjacent electric resistance welded steel pipes. ### Claim 7 (depends on 5) The method for producing the long steel pipe for reel-lay installation according to claim 5, wherein one of the adjacent electric resistance welded steel pipes has a tensile strength in a range of 413 MPa to 787 MPa, and other of the adjacent electric resistance welded steel pipes has a tensile strength in a range of 413 MPa to 850 MPa. ### Claim 8 (depends on 7) The method for producing the long steel pipe for reel-lay installation according to claim 7, wherein a tensile strength of the other of the adjacent electric resistance welded steel pipes at the 3 o'clock cross-sectional position is higher than a tensile strength of the one of the adjacent electric resistance welded steel pipes at the 3 o'clock cross-sectional position by 30 MPa or more. ### Claim 9 (depends on 2) The long steel pipe for reel-lay installation according to claim 2, wherein one of the adjacent electric resistance welded steel pipes has a tensile strength in a range of 413 MPa to 787 MPa, and other of the adjacent electric resistance welded steel pipes has a tensile strength in a range of 413 MPa to 850 MPa. ### Claim 10 (depends on 9) The long steel pipe for reel-lay installation according to claim 9, wherein a tensile strength of the other of the adjacent electric resistance welded steel pipes at the 3 o'clock cross-sectional position is higher than a tensile strength of the one of the adjacent electric resistance welded steel pipes at the 3 o'clock cross-sectional position by 30 MPa or more. ### Claim 11 (depends on 6) The method for producing the long steel pipe for reel-lay installation according to claim 6, wherein one of the adjacent electric resistance welded steel pipes has a tensile strength in a range of 413 MPa to 787 MPa, and other of the adjacent electric resistance welded steel pipes has a tensile strength in a range of 413 MPa to 850 MPa. ### Claim 12 (depends on 11) The method for producing the long steel pipe for reel-lay installation according to claim 11, wherein a tensile strength of the other of the adjacent electric resistance welded steel pipes at the 3 o'clock cross-sectional position is higher than a tensile strength of the one of the adjacent electric resistance welded steel pipes at the 3 o'clock cross-sectional position by 30 MPa or more.