专利名称：CLAMPING TESTING METHOD AND
CLAMPING TESTING DEVICE OF OIL WELL
PIPE JOINT
发明人：KAWASHIMA JIYUICHI,MORITA YOSHIYASU 申请号：JP9522084
申请日：19840511
公开号：JPS60238738A
公开日：
19851127
专利内容由知识产权出版社提供
摘要：PURPOSE:To execute a reliable test by inrting a center shaft having a tapered part and a screw part into a pipe end part, screwing a nut to the screw part by inrting a split ring into the tapered part, and preventing compression plastic deformation of the pipe end part by pressing the split ring. CONSTITUTION:In a clamping testing device 9 installed in the tip part of a pipe 1 corresponding to a coupling 2, a center shaft 12 having a tapered part 10 and a screw part 11 is inrted into the inside of the end of the pipe 1, and a holding ring 15 is fitted looly by fitting externally a split ring 13 to the tapered part 10. Also, the ring 13 is expanded and slid along the tapered part 10 by a nut 14 screwed to the screw part 11 through a plain washer 19, the ring 13 is adhered tightly to an inside peripheral surface 1a of the pipe 1, the pipe 1 and the coupling 2 are screwed and a clamping test is executed.
申请人：SUMITOMO KINZOKU KOGYO KK
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