a) You know the pipe OD (by the size) , thickness (by the schedule), calculate cross-section area (by mathematics) , multiply by length and density (mathematics) and you get the weight. Provided you know all the above.
b) Go to the website of any supplier and the weight/ft is given (at least in most of them)
BTW: was it such a difficult calculation ? the time taken to post it would have been more than the time taken to calculate.
I keep some small Excell files for doing it with different shapes.
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