The dial of gauge should be scaled to indicate pressures up to 120 lbs. and be marked “STEAM.”
This kind of gauge is used on locomotives and is the best for withstanding the vibration which causes fire-pump gauges to be often unreliable. Moreover, this double spring is safer against freezing.
24. Drain Cocks.
a. Four brass drain cocks, each with lever handle and of one-half inch bore, are to be provided, and located one on each end of each steam cylinder.
Care should be taken to select a pattern of cock whose passageway is the full equivalent of a 1⁄2-inch hole. Some patterns of 1⁄2-inch commercial cocks although threaded for 1⁄2-inch pipe thread have but a 1⁄4-inch hole through them. Such are not acceptable.
25. Oiling Devices.
a. A one-pint hand oil pump, to be connected below the throttle, and a one-pint sight feed lubricator, to be connected above the throttle, must be furnished with each pump.
b. Oiling holes must be provided for all valve motion pins, and for each end of both rock shafts.