| 摘要 |
PCT No. PCT/FI88/00012 Sec. 371 Date May 23, 1989 Sec. 102(e) Date May 23, 1989 PCT Filed Jan. 28, 1988 PCT Pub. No. WO88/05881 PCT Pub. Date Aug. 11, 1988.The invention relates to a welded pipe joint comprising a sleeve (3) welded (5, 6) at each end thereof to the respective pipe (1, 2). The wall of the sleeve (3) at each pipe provided with a boring in which a nipple (11, 12) for oil is arranged. In connection with each nipple, a peripheral groove (15 16) is arranged to extend around the respective pipe (1, 2). Oil introduced through the nipples (11, 12) prevents pickling acid from entering clearances (9, 10) between the pipes (1, 2) and the sleeve (3), and impurities from gathering in gaps (7, 8) between the end faces of the pipes and a central shoulder (4) formed internally in the sleeve. |
