The pipe fell into two general categories; what was run into the wells and what was used for flow lines and collection systems.
The pipe was various grades of steel, welded and non-welded mfg process, connected by threads and collars or beveled for welding. Cast iron pipe was generally not used except for civic purposes
Most of the pipe that run into the wells was 28 to 42 feet long and diameters of 2 3/8 inches to 20 inches in diameter. This pipe was called casing and tubing and screwed together. There were caps on the ends to protect the threads.
The pipe used for collection lines ran from 2 inches to as much as 30 inch diameter. The length was usually thirty feet and up. Most of this pipe was joined by welds. Some of this pipe was tarred and wrapped before it was put in the ditch.
Some of the smaller pipe was banded for transport, some of it was laid on cribbing, some was chained to the cars and some was stacked in a pyramid. The diameter had a lot to do with how it was placed on the car.
Despite popular myths, most of the pipe transported was not drill pipe.