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Selection of Longitudinal Submerged Arc Welded

 

(1) for the peak shaving requirements of the pipeline, because the user's gas consumption is very uneven, frequent pipe pressure fluctuations, steel to withstand the great alternating stress, the pipe has been the defects in the alternating stress expansion, if Selection of welds, defects, high probability of spiral welded steel pipe, pipe safety operations will not be guaranteed.

(2) the pipeline through the earthquake fault zone or through the local high-intensity seismic areas, because of the geological activity of these lots, the pipeline will produce longitudinal or axial alternating stress. Spiral weld, defect probability is higher than the straight seam submerged arc welded steel pipe, in the long-term stress, spiral welded steel pipe accident probability is much higher than the straight seam submerged arc welded steel pipe, therefore, in this area should be selected straight Submerged arc welded steel pipe.

(3) of the inner and outer coating requirements of the pipeline should be used Longitudinal submerged arc welded pipe. Spiral submerged arc welded pipe and more welds than the general high straight seam submerged arc welded steel pipe high, in the steel pipe for internal and external corrosion, the combination of anti-corrosion materials and bare pipe submerged arc welded pipe as close, Anti-corrosion effect is not good Longitudinal submerged arc welded pipe.

(4) for important cross-over works, should be used straight seam submerged arc welded steel pipe. As the future maintenance and management than the general line segment difficult, therefore, the use of excellent performance of LSAW steel pipe is particularly necessary.

(5) weak links for the pipeline, such as heat simmer elbow pipe, should be used straight seam submerged arc welded steel pipe. Heat simmer elbow due to the direction of change, its internal and external forces than the general line straight pipe to large, due to the process of simmering by various factors, the stress is not easy to eliminate, is the long-distance pipeline is relatively weak links , The use of good overall performance of LSAW steel pipe can make up for these deficiencies.

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