Description

　　Size range:

　　O.D: Ф323.8-Ф1822.4mm

　　Length: Max.12.2m(40ft)

　　Wall Thickness: When the steel grade is X70

　　the wall thickness ranges from 6.4 to 26.4mm(0.252-1.04in);

　　When the steel grade is lower, the wall thickness will be increased accordingly

　　1. The pipe internal stress is very small and uniformly distributed after the full- length expansion. The corrosion and cracking of the pipe owing to stress can be effectively prevented.

　　The application of welding on site is very easy because of the high dimension precision;

　　2.The inside and outside welding are performed after the tack welding, so the welding process is very stable with good weld quality;

　　3. The NDT is easy to perform on the weld during production and field operation as well;

　　4. The length of the weld is shorter than that of the non-longitudinal seam pipe, so the probability of defects occurrence is very low;

　　5.The coverage of the pipe specification is very wide. The pipe can be either in very large diameter with thick wall or in very small diameter with thick wall.