pipe provern.Engineering a device for testing the strength and soundness of steam or water pipes by hydraulic pressure.
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1875 E. H. KnightAmer. Mech. Dict. III. 1711/2Pipe-prover, an apparatus for the purpose of proving steam and water pipes by means of hydraulic pressure.
1991 Offshore Engineer Sept. 196/3 Further sections give detailed advice on calibrating and operating pipe provers.