In the production process of the screw thread of the Guangxi spiral pipe, according to the API specification rules, the thread working rules are used to check the tight pitch of the thread, and the single thread tester of the drill thread is used to detect the thread pitch and taper according to a certain inspection period. In the field, the worn thread can be used to check the wear status of the thread tooth. The remaining tooth crest width is not less than 1/2 of the original tooth crest width, and the remaining tooth crest height is not less than the original tooth crest height. 2/3, when the number of worn teeth does not exceed 3.5 teeth, the thread can still be used continuously, otherwise it should be repaired. The most effective way to identify the thread of the Guangxi spiral pipe on the spot is to use a joint ruler. This ruler is a vernier caliper specially marked with the root diameter of the external thread and the diameter of the tapered hole of the internal thread. It is simple, intuitive and accurate. In addition, it is also possible to directly use a long-foot vernier caliper to contact the steel ruler to measure the outer diameter, length, and internal taper diameter of the external thread against the thread specification. The thread is placed vertically, and the upward direction of the spiral can be distinguished from the front. The upward direction is the right direction, and the left direction is the left direction.

    According to different production processes, the steel pipes of Guangxi spiral pipes are divided into seamless steel pipes and welded steel pipes. Seamless steel pipe is a seamless steel pipe made by perforating a steel ingot, a billet or a steel rod; the welded pipe is made of hot-rolled or cold-rolled steel plate and steel coil welding, which can be welded in a longitudinal straight seam or spiral welded.