You get a sr pipe everytime you buy a chicken meal at rajas. Good for black people:)
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SR Z class was created in 1929.
bokum
Bi pipe is a black iron pipe.
bore of the pipe is the internal diameter of pipe but the nominal diameter of pipe is the dia of a circle which is draw through a point which is situates at exactly half of the thickness of pipe or we can say that (outer dia of pipe- thickness of pipe )=nominal bore of pipe.
Pipe bore is the actual minimum inside diameter of a pipe, which is not necessarily the nominal pipe size.