drill pipe

hubocfcool

Senior Member
Chinese
"My particular experience is largely in oil, and the search for oil has done more to improve deep drilling than any other mining activity. When it has been decided where we are going to drill, we put up at the surface an oil derrick. It has to be tall because it is like a giant block and tackle, and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom." (T.F.GASKELL The Search for the Earth’s Minerals from Discovery)

Why use "drill pipe" instead of "drill pipes" here?
 
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