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Show 6 INTER-MOUNTAI- under similar conditions, it is fair to assume that the above given efficiency is not far from the average, and that nothing short of a change of system would make a material increase in the efficiency. If we go back of the steam cylinders to the coal pile we find a still more deplorable state of affairs, for to operate these three compressors requires eight boilers, contons of coal per day of twenty-fsuming thirty-fiv- e hours. our MINING REVIEW. N on the same frame. The cylinders are 7 by 10 inches and have a capacity of 250 gallons per minute against a head of 115 feet. The pumps are mounted on a four wheel truck and can be moved around as desired. The station pumps, two in number, are double acting duplex with water ends of Deane Co. make and cylinder 91 by 12 inch, geared to a 110 II. P. motor. These pumps have each a capacity of COO gallons per minute against a head of 400 . The probable efficiency of the electric plant feet. was estimated as follows: Shortly after the order was given to erect the Direct coupled engine and generator, 80 per ct. electric plant the No. 1 mine encountered an 00 increased flow of water which flooded the mine, Line 85 the water coming up the slope a distance of Motor 1500 feet before it was held in check, and a pump 82 Pump and gearing u was placed at this point to hold the water until 50 Total efficiency, With the above efficiency, a 60 H. P. engine the electric pumps could be putin operation. would do the work now requiring 312 by the The water has since been pumped down 700 compressors.. Further, 'assuming the installa- feet by the electric pumps and the work has tion of a compound engine, using the mine been as severe a test on the pumps as any water for condensing, the total coal consump- skeptic could desire, and if the remainder of hours would not exceed the pumping is completed with as good success tion per twenty-fou- r tons as that already done, it may be truly said that three tons, making a saving of thirty-tw- o the electric pump has come to stay. For over per day. The order for the electric plant was given to a month the two small electrics and an air the Denver Engineering Works Co., who were pump have been working side by side in an instructed to install sufficient power to operate entry 10 feet wide by 5 feet high, with the exin addition to the regular pumps, the ventilat- haust of the air pump, into which a stream of ing fans, screens, and shops about the mine, the water is discharged to prevent it from freezing, selection of the machinery being left entirely discharging so near the electric pumps that it to the engineers of the Denver Engineering was necessary to protect the latter from the This is certainly a good Works. The plant as installed is described as water by an follows: The power house is a substantial test for the waterproof properties of the motors covered with cor which are still doing their work and appear to building of wood, rugated iron and completely sealed in- be in excellent condition. The average of numerous tests on the two side. It is large enough for two generating units and condensers and is equipped with a small electric pumps gave the following 6000 lbs. capacity three-motiotraveling crane. results : oil-clot- h. n it Average gallons per minute discharged. . .500 56.5 being the intention of the Fuel company to in- Average pressure at pumps soon as as reserve second the Average strokes per minute, each pump. .172 unit stall the One generating unit only was installed, eleofec system should demonstrate its success. The engine is a Vertical Cross Compound Marine type and designed by E. F. Williams of New York City. The cylinders are 11 x 19 x 15 inch stroke, developing 150 H. P. at 250 rev. The condenser is a Wheeler surface condenser of the Admiralty type. The generator, mounted direct upon the shaft of the engine, has a capacity of 190 amperes and 550 volts. The generator as well as all the motors are multipolar machines, built by the General Electric Co. The switch board is of polished slate and is equipped with the latest improved instruments and safety appliances. To insure absolute protection from lightning, which is very severe in this locality, all circuits are placed underground. The important circuits consist of iron armored and lead cables, while the lighting circuits are made by running rubber covered wire in iron pipe. The mine circuit consists of No. 0000 weather-proo- f wire supported on triple petticoat glass insulators d brackets nailed to mine props. and A 10 II. P. Multipolar Motor drives two shaking coal screens on the tipple, another 10 H. P. motor runs the machine shop and a 25 H; P. motor drives the 20 foot ventilating fan. The installation of these motors displaces a similar number of engines and does away with about 1000 feet of steam pipe, the condensation in which was no small loss. There are two small pumps used as sinking pumps, which are of the duplex type having water ends of the Deane Co. make, and driven through gearing, by a 15 H. P. motor mounted non-condensin- Average amperes Average station voltage Average I. H.P. at engine Average H. P. at pump discharge efficiency g. iron-woo- , . engine will have a comfortable load, and it js safe to say that the total efficiency of the pump, ing plant will then be very close to 60 per cent. The fact remains, however, that the efficiency above shown by the present working, the former pumping 400 gallons per minute against 120 pounds pressure, which equals 28 II. P., can be accomplished by the electric plant with but 50 II. P. at the surface instead of 312 as before : As in the case of the Compressed Air plant, let us go back of the steam cylinder to the boilers. The engine running the generator was supplied with steam from the battery of boilers operating the compressors, but the piping is so arranged that one horizontal tubular boiler, 60 inches by 16 feet, could be cut off from the rest of the battery and supply steam to the electric plant alone. This was hot the regular practice because all the boilers were required to supply the necessary steam even when two compressors were running, but on several occasions, when the main steam line was shut down for an hour or more the electric plant was run on the one boiler, with ease, the safety valve popping more than once during the run, and this with the engine running non-condensin- g. Qualitatively speaking, actual results with the compressed air and electric plants which are the subject of this article, show that the work of pumping calling for 312 . P. and 8 boilers in the case of Compressed Air , could be done by electricity with but 36 H. P. and one boiler , disregarding even the use of a compound engine and a condenser. Further, the writer has no hesitancy in saying that the whole plant of pumps and machinery formerly requiring the eight boilers taxed to their utmost, can be operated by the present electric plant with but the one horizon- tal tubular boiler. 37 475. 32.86 16.4 HmH' 555 -- 444444 4 3 4 4 44 44 M 'I The Siegel Clothing Co. : Largest Clothing House in the West. Generator unit, engine and dynamo. 71.5 per ct. jr 70. per ct. 8. Motor, pump and line T A WHOLESALE AND RETAIL- - A L FLOORS Total, from cylinder of engine to L REPLETE WITH 50. per cent. 4 water discharge of pump As soon as the first station pump was started and in good running order, tests were made with 1 MINERS CLOTHING, OIL AND the following results RUBBER COATS, HATS, CAN- Average gallons per minute discharged. . .650 64 Average pressure at pump YAS SUITS, RUBBER BOOTS, strokes 188 minute Average per 53.5 Average amperes SHOES, BLANKETS, ETC. 550 Average station voltage 53.6 Average I. H. P. at engine: 24 Average H. P. at pump discharge 61, 63, 65, Main Street, efficiency: Generating units, engine and dynamo 73 per ct. 61 per ct. Motor, pump and line Total, from engine cylinder to pump 44.5 per ct. discharge Although the total efficiency with the small pumps is as high as predicted it is nevertheless true that the engine and dynamo are working at a disadvantage with a load of but 20 per cent of their rated capacity. In the case of the large pump the generating unit is underloaded as is also the pump, which combine to bring the total efficiency below the estimated 50 per cent. When the mine is finally pumped out and all pumps and motors running, the generator and ; Salt Lake City, - - J I A $ J J Utah. RUPTURE Of Men. Women and Children without pain, or o slightest inconvenience by the FI I)KL1 T Y METI IO Patients need not pay n dollar until cured. Only to 00 days required to cure. The truss discarded r ever. Over 1 1.000 cases cured In the last six years There is no loss of time, patients can attend to thc: regular work. FIDELITY RUPTURE CURE CO. 1 1 - ! Rooms429 30 Atlas Blk. Salt Lake City, Utah. notices mining- men to have their assessment notices and delinquent It will be advantageous to - of shareholders meetings, lists published in the Mining Review. |