LSAW pipe

1.Double-sided submerged arc welding — inside and outside passes guarantee full penetration and base-metal-equivalent strength. 2.Short weld seam — roughly half the seam length of spiral pipe at equal OD, with correspondingly lower defect risk and residual stress. 3.Tight tolerances — mechanical expanding delivers low ovality and uniform wall thickness for efficient field alignment and automatic welding. 4.Large OD & heavy wall — covers 400–1,600 mm OD up to 60 mm WT at high steel grades, far beyond the reach of ERW pipe.   5.Full traceability — 100% seam NDT, individual hydro-test and heat/lot traceability, with PSL2 supplementary requirements available.