Swivel packing seal assembly is the key of the swivel, whose function directly influences its service life, further more, and affects the drilling speed.

The wash pipe packing of drilling swivel showed wear-and-tear continually in drilling process due to its structural design.

The mean value of work loads on a shaft bearing of swivel and rotary table is determined by basic principles of fuzzy theory, considering the loads' fuzziness and the requirement for reliability.

Effects of Cast Iron and Chromeplate Tap on Over Night Tap Water Quality;

Human-computer interaction problem of tap was discussed from the two aspects: switch device design and flowing angle design.