(1) required for the high peak pipeline, because the user's gas consumption is very uneven, frequent fluctuations in the pipeline pressure, alternating steel to withstand the stress is large, defects will already in pipes alternating stress expansion if optional multi- weld defect high probability spiral welded steel pipe, pipeline safety operations will not be guaranteed.
(2) Pipeline crossing earthquake fault or through local high intensity earthquake zone, because these lots geologically active, which will have a vertical or axial pipe alternating stress. Spiral weld is much higher chance than LSAW steel pipe, in the long term stress, spiral welded steel pipe is much higher than the chance of an accident LSAW steel pipe, therefore, in this zone should be used straight submerged arc welded pipe.
(3) internal and external coating demanding pipes, LSAW steel pipes should be used. Multi- spiral submerged arc welded pipe weld, the weld reinforcement generally higher than LSAW high on steel pipe inside and outside corrosion, the corrosion-resistant materials combined with the bare pipe LSAW degree as closely antiseptic effect is not good LSAW steel pipes.
(4) For critical wear crossing project, you should use LSAW steel pipe. Since future maintenance and management difficulties than the general line segment, therefore, with excellent performance LSAW particularly necessary.
(5) For piping weak links, such as hot simmer elbow pipe, LSAW steel pipe should be used. Hot simmer elbow as change of direction, which is subject to external forces than the general lines of straight pipe should be large, because the simmer process affected by various factors, the stress is not easy to eliminate long-distance pipeline is weak link using an integrated LSAW good performance can make up for these deficiencies.
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