Use of spiral pipe in pipeline

Industrial development of the second pipe climax will surely come. Spiral steel pipe will be put into research, enhance pipeline capacity. In fact, spiral steel pipeline transportation has many advantages, insufficient transmission capacity is poor response. For just freezing point, high waxy crude oil, higher than the designed capacity, subject to existing pipeline capacity and pressure pumping capacity constraints; below the designed capacity, thermal conditions will be subject to the constraints of the existing pipeline. With the development of society, now with the offshore oil and gas field development, subsea pipeline has also been rapid development, which of course the pipeline steel are rising ever higher. Spiral pipe diameter, high strength, and practical features make it a first choice for many long pipeline pipeline. To overcome this fixed point, only with DRA and depressant.

How to avoid pipeline ruptures have a method, the base metal and weld flattening test, guided bend test, ground test, Charpy impact test and many toughness inspection targets. This is because the long-distance pipeline hundreds of kilometers long and some even more than a thousand kilometers long welds, weld too much, plus the construction and damage caused during transport and so on, so that the probability increases between buildings. Not only for the gas pipeline has a higher toughness requirements, oil pipeline in recent years also made a high impact toughness requirements. With the improvement of spiral steel strength grade and diameter increases, the impact toughness of the material because people understand the importance, in many parts of the world have occurred fragility and fracture toughness of pipeline accidents. Pipe toughness of steel pipe has actually become an important indicator. Spiral steel pipe and ductile crack extension instability instability expansion. For long-distance pipeline, it should completely avoid the crack is very difficult, in fact, at home and abroad are difficult to fully achieve.