This service evaluates used drill pipe in accordance with API-RP-7G specifications for used drill pipe and tool joints. The service includes the following elements:
Electromagnetic induction techniques are applied to scan the inside end areas of the drill pipe for fatigue cracks, corrosion pits and other service induced defects. Drill pipe is marked and classified as above.
The outside and the inside surface of the tube is visually examined.
A transversely oriented magnetic field is induced into the tube and iron powder applied to its outside surface. The powder is attracted to areas of variation in the magnetic field created by longitudinal or three dimensional defects, thus outlying the defects. Depth of the defect is then determined by grinding to the point of maximum penetration and measuring with an accurate depth gauge.
This inspection detects all defects extending to the surface and representing external damage or actual parting material:
A transverse magnetic field is induced. Pins and boxes are inspected for longitudinal defects using the liquid suspension method.
Threads are inspected with profile gauge for pin elongation and box expansion.
O.D inspection of drill pipe tool joints is performed using ring gauges.
AC-YOKE or shooting rod magnetization of the slip area and magnetic particle
A gauge is rotated along a helical path down the pipe to locate abrasive wear, stretching expansion and other deviations from nominal O.D.
Wall thickness spot test -ultrasonic compression wave technique
Ultrasonic spot checks are made to determine the wall thickness along a helical path or in specified area.
Utilizing a centered grinding tool nicks, gouges, pits and other imperfections are removed from the seals of connections of the above material. The amount of the material removed is carefully controlled by the use of Vernier gauges to meet with specifications.
All pipes lengths are conveyed through the hydraulic pipe straightening unit to remove bends, kinks, and cork screws. Charges are made only for those lengths, where straightening became necessary.
Dimensional Inspection and Magnetic Particle Inspection performed to API specifications of dimensions.