Nippon Steel Sumitomo Metal Corporation

Vallourec & Mannesmann Oil & Gas France

Vallourec Oil and Gas France

Jun Masubuchi

Keiichi Nakamura

Masayoshi Sasaki

Masaki Yamano

Makoto Sakamoto

Kenta Sakai

Ikuji Hoshino

Katsutoshi Sumitani

Takumi Nakamura

A coating apparatus for forming a thin UV curable resin coating on threaded end portions of a steel pipe comprises a spraying unit having at least two nozzles adapted to spray the resin coating composition by pneumatic atomization toward the threaded end portion of the steel pipe, a resin supply system for supplying the resin coating composition to each nozzle, and a first nozzle support means which supports each nozzle for movement in the axial direction of the steel pipe and in the vertical direction. The two nozzles are disposed at different positions at least in the axial direction of the steel pipe at angles which are sloped such that the sprayed streams from the nozzles approach each other. The resin supply system has a regulator for maintaining the spraying air pressure of the resin coating composition in each nozzle of the spraying unit at a predetermined respective value.

Coating apparatus for applying a UV curable resin to a threaded end of a steel pipe

The present invention provides a method which allows simply, easily and accurately evaluating the fastening state of shoulder parts of a threaded joint for use as a joint of pipes or tubes, such as OCTG, during fastening or after fastening. The fastening state evaluation method for a threaded jointof pipes or tubes according to the present invention is characterized in that it transmits ultrasonic surface waves from the internal surface of either one of the pinand the boxtoward the internal surface of the other one of the pinand the boxthrough the shoulder partsof the pinand the box, and on the basis of the transmitted wave intensity or the reflected wave intensity thereof, determines whether or not the fastening state of the threaded jointis satisfactory.

Method of evaluating fastening state of threaded joint of pipes or tubes, method for fastening threaded joint of pipes or tubes, and apparatus for evaluating fastening state of threaded joint of pipes or tubes

Growing community of inventors

Wakayama, Japan

Jun Masubuchi