Guangxi Spiral Pipe Manufacturing Specifications

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2018-06-07

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During production, the threaded connections of Guangxi spiral pipes are inspected in accordance with API specifications, using thread‑gauge gauges to verify thread pitch and tightness. Periodic single‑parameter thread gauges are employed to measure pitch and taper. At the job site, worn threads can be assessed with a thread‑form gauge; the remaining crest width must be at least half the original, and the remaining crest height at least two‑thirds of the original. If the number of worn threads does not exceed 3.5, the connection may continue to be used; otherwise, re‑threading is required. The most effective method for identifying thread types on Guangxi spiral pipes at the field is to use a coupling gauge—a vernier caliper marked with the external root diameter of the male thread and the internal enlarged‑taper hole diameter of the female thread—offering simplicity, clarity, and precision. Alternatively, a long‑shank vernier caliper combined with a steel ruler can be used to measure the external root diameter, length, and internal enlarged‑taper hole diameter, allowing direct comparison with the relevant thread standards. When the threads are held vertically, the direction of the helix—as viewed from the front—indicates the thread sense: a rightward rise denotes a right‑hand thread, while a leftward rise indicates a left‑hand thread.

During production, the threaded connections of Guangxi spiral pipes are inspected according to API specifications, using thread‑gauge gauges to verify thread pitch and tightness. Periodic single‑parameter thread gauges are employed to measure pitch and taper. At the job site, worn threads can be evaluated with a thread‑form gauge; the remaining crest width must be at least half the original, and the remaining crest height at least two‑thirds of the original. If the number of worn threads does not exceed 3.5, the thread may continue to be used; otherwise, re‑threading is required. The most effective method for identifying threads on Guangxi spiral pipes at the job site is to use a coupling gauge—a vernier caliper marked with the root diameter of external threads and the expanded‑taper hole diameter of internal threads—offering simplicity, clarity, and accuracy. Alternatively, a long‑shank vernier caliper combined with a steel ruler can be used to measure the external root diameter, length, and internal expanded‑taper hole diameter, allowing direct comparison with thread specifications. When the thread is held vertically and viewed from the front, the direction of the helix indicates the thread’s hand: a rightward rise denotes a right‑hand thread, while a leftward rise denotes a left‑hand thread.

Steel pipes in Guangxi are classified into two types—seamless steel pipes and welded steel pipes—based on their manufacturing processes. Seamless steel pipes are produced by piercing ingots, billets, or steel bars to form seamless tubes, whereas welded pipes are made by rolling hot‑rolled or cold‑rolled steel plates and strips into a coil and then welding them, either with longitudinal straight seams or with spiral welds.

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