BOPI 10 BR/2023 REPERTOIRE NUMERIQUE 15 Consulter le mémoire ________________________________________ (11) 21188 (51) F16L 15/04 (2018.01) (21) 1202200172 - PCT/JP2020/047837 (22) 22/12/2020 (30) JP n° 2020-005809 du 17/01/2020 (54) Screw joint for pipe. (72) OKU, Yousuke (JP); MARUTA, Satoshi (JP); MARTIN, Pierre (FR) et DALY, Daly (FR) (73) 1-NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, TOKYO 1008071 (JP) et 2-VALLOUREC OIL AND GAS FRANCE, 54 rue Anatole France, AULNOYE-AYMERIES 59620 (FR) (74) SPOOR & FISHER Inc. NGWAFOR & PARTNERS Sarl, The House of Gideon, Golf/Bastos Quarters, Opposite The American Embassy, Entrance-Saint John Paul II Boulevard, P.O. Box 8211, YAOUNDE (CM) (57) The purpose of the present invention is to improve the compression resistance performance in a screw joint for a pipe in a situation in which a combined load is repeatedly applied, the screw joint having an intermediate shoulder surface that functions as a torque shoulder in the middle of a two-stage screw. As a distance LB between an intermediate shoulder surface 33 and an end shoulder surface 34 of a box 3 before fastening bccomes larger than a distance LP between an intermediate shoulder surfacc 23 and an end shoulder surface 24 of a pin 2 before fastening, the intermediate shoulder surfaces 23, 33 are strongly pressed against each other to function as the torque shoulder, but the end shoulder surfaces 24, 34 are uncontacted or lightly contacted, at the time of completion of the fastening. When a certain magnitude of compressive load is applied to the pin 2 and the box 3 in a fastened state, the diffcrcncc (LB-LP) between the axial distances is determined so that the pin 2 and the box 3 are slightly compressed in an axial direction by the compressive load, and the end shoulder surfaces 24 and 34 are in pressure contact w ith each other to bear a portion of the compressive load. Fig. 2A Consulter le mémoire
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