Drill pipe transmits torque and axial load while providing the flow path for drilling fluid. A finished joint combines the pipe body, upset ends, weld zones, tool joints and rotary-shouldered connections.
A usable enquiry identifies the applicable API 5DP edition, nominal size and weight, grade, range, upset type, tool-joint dimensions and connection. Suitability depends on the drilling design.
Tool-joint outside and inside dimensions affect strength, hydraulics and fishing clearance. Connection geometry, hardbanding and any internal coating should be reviewed against rig interfaces and casing-wear objectives.
The agreed quality plan may include material verification, dimensional checks, NDT of the body and weld areas, connection gauging, hardness, visual examination, marking and final document review.