An OCTG system composed of MAC’s Rotoflux® transverse and longitudinal flux leakage systems, a Demagnetizer, and an Echomac® ultrasonic test system was recently designed and delivered for inspection of heavy wall, hot rolled, straight or upset pipe. Specifications for this system are:

 

Pipe Diameter-                 60mm-220mm;                2.36”-8.6”
Wall Thickness-               up to 20mm;                      0.78”
Test Speed-                      20-90m/min;                      65-295 fpm for upset pipe
                                            90m/min;                            295 fpm for straight pipe

 

The nondestructive test commences when the tube first passes through the longitudinal magnetization  test where it will receive a high level of magnetic saturation and be tested for transverse defects. Then, the tube passes through the transverse magnetization test where longitudinal defects are detected. The Rotoflux detects longitudinal and transverse defects on the OD and ID, such as rolling skins, laps, cracks, laminations, cavities, and internal defects. After passing through the flux leakage inspections, a demagnetizer is used to remove any residual magnetization before the tube enters the ultrasonic test for OD/ID defects, wall thickness and  lamination.

 

The total system also includes inlet and outlet conveyors comprised of driven V-rolls that are articulated. This means that they can be moved up or down allowing for the upset ends to pass. The inlet conveyor feeds the tube through the system which is on a triple guide constant center bench. The bench is designed to open for upset ends and close automatically after the leading or trailing end has passed. The outlet conveyor then transports the tube from the test and into accept or reject sorting pockets. This system is completed with the Rotoflux and Echomac FD-4 electronics, a water system, automatic markers, and a Conductor control panel.