Re: drill pipe

Drill pipe is used to turn a bit and bore a hole in the ground. Drill pipe commonly weighs 16.6 pounds per ft and has a body diameter of typically 4 1/2 inches. The male and remale ends of drill pipe that have threads are tool joints that are welded on. They are quite heavy as they take a great beating when rotating the pipe under load.
Casing and tubing have a collar on one end with female threads. the male threads are machined directly on the pipe. Pipe used for transportation of oil and gas from the well to a tank battery or refinery is generally welded together.