Casing tube or casing pipe is used to prevent borehole collapsing, which are widely used in geotechnical applications. Guizhou Vilong provide full W series of casing tube including AW, BW, NW, HW, PW, HWT, PWT etc sizes according to DCDMA standards.

W series of casing tube are direct connecting casing, or called flush joint casing, male and female threads are set respectively at two ends. Casing tube lengths are added directly no need a joint coupling, which help to prevent the threads climbing under heavy torque loads, currently the most popular type of casing used in geotechnical drilling applications.