Longitudinal PipeHigh Grade and High Quality Longitudinal Seam SAW Pipes
Longitudinal seam SAW pipes are produced by worldwide guidelines and details such as API 5L, API 2B, ASME B31.3, ASME B31.4, ASME B31.8, ASTM A134, ASTM A139, ASTM A252, ASTM A570, ASTM A672 AWWA C200, ISO 3183, BS 3601, DIN 16726, DIN 17102 and other standards. All pipes produced are manufactured with high dimensional accuracy that is required for line pipes and structural purpose pipes.
Pipes are formed starting from the plate set in the edge milling machine and rolled cylinder is processed further into the edge crimping machine prior to Tack Welding. Tandems inside and outside SAW are then performed to ensure a joint efficiency factor of 1. Afterwards, mechanical expanding is conducted for 0.8% – 1.5% expansion ratio to relieve the pipe of its accumulated stresses during forming and welding processes.Production Size Range of Longitudinal Seam Pipe Mill
Mechanical expanding enhances the dimensional parameters. Hydrostatic testing, ultrasonic inspection, Xray inspection, and final, visual and dimensional inspections are also conducted. The mill proven capability for producing high strength heavy wall like pipe is up to X70.
NPC manufactures longitudinal seam SAW pipes with API 5L Grade B to X70 mostly on engineered to order basis and therefore can produce any size of pipe diameters ranging from 24”-60” (610-1524 mm) and 0.250” -1.200” (6.4 – 30.5 mm) wall thickness.
Please contact National Pipe Company for more details.