Method of inspection

• Electro magnetic (EMI)              detail
• Visual Tube                             detail
• OD Gage Tube                         detail
• UT Wall Thickness                    detail
• MPI Slip / Upset                      detail
• UT Slip / Upset                       detail
• Visual Connection                    detail
• Dimensional                            detail
• Black light Connection              detail

Details of inspection

Visual Tube                                     ↑Back

Full length visual inspection of the inside and outside surfaces of tubes.

Evaluated by straightness, mechanical or corrosion damage, scale and drilling mud.

OD Gage Tube                                ↑Back

Full length mechanical gauging of the outside diameter (O.D) of used drill pipe.

Evaluated by diameter variations caused by excessive wear or mechanical damage, expansion caused by string shot, reductions caused by overpull.

UT Wall Thickness                           ↑Back

Measurement of the wall thickness around one circumference of the drill pipe using an ultrasonic thickness gage.

Evaluated by tube wall thickness below the specified acceptance limits, minimum cross-section area of tube.

Electro magnetic (EMI)                      ↑Back

Full length scanning (excluding upsets) of drill pipe tube using the longitudinal field buggy type unit (Sonoscope).

Evaluated by flaw such as fatigue cracks, corrosion pits, cuts, gouges, and other damage that exceed the specified acceptance limits.

MPI Slip / Upset                              ↑Back

Examination of the external surface of drill pipe and HWDP upsets and slip areas using the active-field AC yoke dry visible magnetic particle technique.

Evaluated by flaw such as fatigue cracks, corrosion pits, cuts, gouges, and other damage that exceed the specified acceptance limits.

UT Slip / Upset                                ↑Back

Examination of drill pipe and HWDP upsets and slip area using shear wave ultrasonic equipment.

Evaluated by flaw such as fatigue cracks, corrosion pits, cuts, gouges, and other damage that exceed the specified acceptance limits.

Visual Connection                             ↑Back

Visual examination of connection, shoulder, and tool joints and profile check of threads.

Evaluated by handling damage, galling, washouts, fins, visibly non-flat shoulders, corrosion, weight /grade marking on tool joint.

Dimensional                                      ↑Back

Measurement or Go-No-Go gauging of pin and box OD, pin ID, shoulder width, tong space, box counterbore.

Evaluated by torsional capacity of pin and box, adequate shoulder to support make-up stress, adequate gripping space for tongs.

Black light Connection                        ↑Back

Fluorescent wet magnetic particle inspection using DC current.

Evaluated by existence of fatigue cracks.

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Copyright © 1999 TuboJapan International Quality Assurance Co., Ltd.
Last Update: 2009/01/20