EXCELLENT PUMPING ENGINES.
The accompanying engravings were made from photographs of two pumping engines recently built by the Still well-Bierce & Smith-Vaile company, Dayton, Ohio, for Napoleon, O., water works.
The engines, as the illustrations show, are of the deep well type. The steam end stands on the floor of the engine room, while the water end rests in the bottom of the pit eighteen feet below, both ends being connected together by substantial cast iron framing, well braced. The steam end of each pump consists of a compound condensing duplex direct-acting engine, the base of which rests on heavy wrought iron I beams spanning the mouth of the pit and firmly embedded in the masonry of the building. Substantial housings carry the high and low pressure cylinders, and the whole is so designed that the steam pistons are readily accessible for inspection or repairs by simply removing the head of each cylinder.
The slide valves are balanced and steam connections are made so that the steam at boiler pressure can be turned directly into the low pressure cylinders by operating a single valve, thus giving a fire pressure in the mains at a moment’s notice. The steam cylinders are lagged with mahogany and all the working parts arc polished.
The water end of each engine is of the differential plunger pattern and the diameters of the plungers are so proportioned that the work done on the down stroke of the engine is greater than that done on the up stroke by the amount due to the weight of the moving parts, thus equalizing the work of the engine on the up and down strokes. The plungers arc outside-packed so that any leukage may be readily detected and the packing adjusted while the pump is in operation. The valve area is amply large, and the valves easily accessible through convenient hand holes.
The rods connecting the steam pistons and water plungers pass through suitable guides in the framing thus overcoming any possible tendency of the roils to spring when the engines are in operation.
The water discharged from the pumps passes through a Wheeler condenser, where the exhaust steam from the engines is condensed, the water of condensation being drawn off by a crank and fly-wheel air-pump and delivered to the not well. From the hot well it is supplied to the boilers, passing through a Stilwell close heater on its way. Suitable provision ⅛ also made for turning the exhaust steam into the air in case repairs should be required in the condenser.
The dimensions of these pumping engines arc as follows: High-pressure steam cylinders, 10 inches diameter. Low pressure steam cylindes, 18 inches diameter; water plungers, 11 1-4 inches and 14 1-2 iuehes diameter; length of stroke, 18 inches. Their capacity is 1,000,000 gallons per twentv-four hours each, with a domestic pressure of 63 pounds and a fire pressure of 125 pounds.
The entire construction of these engines is of the most substantial character, and affords a creditable example of the class of work turned out by this company.