Spiral Steel Pipe Introduction

1.    Definition of Spiral steel pipe

Spiral steel pipe is also called spiral steel welded pipe or spiral welded steel pipe. Spiral steel pipe use low carbon structural steel or low alloy structural steel trips with a helix angle(called forming angle) rolling into a tube, then the tube seam welded together. The characteristics of spiral welded steel pipes is that it can use a narrow strip steel to produce large diameter steel pipes.

2.    Application of spiral steel pipe Application

Spiral steel pipes is mainly used in the filed of oil and gas pipeline or other large diameter structure pipes.

3.    Produce process

1) Raw material is strip coil, welding wire, flux. All these before producing need strict physical and chemical tests.

2) Strip head and tail docking, using single or double wire submerged arc welding, the steel tube rolled by automatic submerged arc welding machine.

3) Before molding, the strip passes through the leveling, trimming, planing, surface cleaning and conveying, and bending and handling

4) Using the electric contact pressure gauge to control the pressure of the cylinder on both sides of the conveyor, to ensure the smooth delivery of the strip.

5) Roll Forming is by the external control or internal control.

6) Using the welding gap control device to ensure that the weld gap to meet the requirements of welding, pipe diameter, the wrong side of the amount and the weld gap are strictly controlled

7) Welding with the Lincoln Electric welding machine for single or double wire submerged arc welding, so as to obtain the stable welding specification.

8) The welding seam is through the online continuous ultrasonic automatic inspection, to ensure that 100% of the spiral weld nondestructive testing coverage rate. If there are defects, automatic alarm and spraying marks, the production workers adjust the process parameters, timely elimination of defects.

9) Using the the air plasma cutting machine to cut a single pipe.

10) After cutting into a single tube, each batch of steel tube should pass the strict inspection system first, check the weld mechanical properties, chemical composition, blending, surface quality of the pipe and after nondestructive inspection, to ensure that the pipe qualified.

11)  The pipes have continuous acoustic inspection marks, after manual ultrasound and X ray review, if there are defects, after repair, once again after the non destructive testing, until the defects have been eliminated.

12) Each pipe is tested by hydrostatic pressure, and the pressure is sealed by radial seal. The test pressure and time are strictly controlled by the steel pipe water pressure computer testing device. Automatic print record of test parameters

13) ) The pipe end machine the slope angle and blunt edge.

Hebei Shengtian GroupReaguan Pipeline Co.,Ltd is mainly produce steel pipes. Carbon steel pipe, seamless pipe, spiral pipe, ERW pipe, SSAW,LSAW pipes. Free samples !  Your best choice !