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est WARD boiler was rigidly tested at the plant of the A Charles Ward Engineering Works, Charleston, W. Va., by a board consisting of Lieutenant Commander H. C. Dinger, U. S. N.; Lieutenant S. M. Robinson, U. S. N.; Lieutenant A. M. Penn, U. S. N., and A. Conti. The boiler tested was the Ward straight tube type, having a total tube heating surface of 4,405 square feet, the volume of the furnace being 476 cubic feet. The fuel used was Elk Refining Co., paraffine base. The seven burners were type | of the bureau of steam engineering. The apparatus and arrangement for test are shown in Fig. 1. The boiler was fitted with a wooden air box at front, fitted with an air lock. Air was supplied by a motor- driven Sturtevant blower. As the blower motor was of the constant-speed type, the air supply was regulated by a butterfly shutter in the blower discharge and a sliding door on the front of the air box. Feed water was supplied by two horizontal Blake pian ger pumps, dis- chare tin: through two Reilly feed- water heaters, the boiler being fed through two check valves. The tempera- ture of the feed water was taken at the feed valves. Oil was sup- plied by two Blake horizontal, piston, sim- plex oil pumps, dis- charging through a Reilly oil-fuel, coal- type heater to the fuel- oil main at the boiler front, a special air chamber being fitted on the discharge line. There were fitted, in addition, three large air cham- bers near the oil heater. These additional air chambers were found necessary in order to : : reduce fluctuations in FIG, 1--=WARD TEST BOILER pressure. Temperature of the oil was taken at the boiler front. The oil used was Elk Refining Co.’s paraffine-base West Virginia oil, of the following characteristics: Special gravity at 60 degrees, 0.8245; baume, degrees Fahr., 40.1; flash point, degrees Fahr., 144.0; fire point, degrees Fahr., 270.0; viscosity (Engler) at 60 degrees Fahr., 9.25; acidity, none; B. T. U., 19,879; sulphur, none. The feed water was measured by taking account of the number of tanks, from a tank calibrated by actual water measurement and found to hold 4,875 pounds. The tank measurement was taken at the beginning and end of the test, and correction applied. Correction was also applied for the difference in boiler-water level at the beginning and at end of the test. The oil was measured by weighing the Paper presented before the American Society of Naval Engineers. Soller Vine This Article Outlines the Method and Equipment Used in Making an Ex- haustive Test on a Ward Boiler—The Results Verify Theoretical Principles quality of the steam. the efficiency of the boiler when burning oil at the rate of 2,300 268 licates esign By Lieu‘enant S. M. Robinson, U.S. N. actual oil every 10-minute interval. After having weighed the tank, oil was run into a pump-suction tank. The height of oil was brought up to a mark at the end of each 10 minutes. - Steam: generated was blown into atmosphere, except that used for pumps and feed-water heaters. A Hayes carbon dioxide (CO2) apparatus was connected to the base of the stack. Samples of gas were taken every half hour. The results of the gas analysis are believed to be unreliable, as they show very little excess of air used over that theoretically possible; as there was smokeless combustion at all times, this would be impossible. An electric pyrometer was fitted in the base of the stack. This was checked during trials with a mercurial pyrometer and found to be accurate. A throttling calorimeter was fitted just below the steam connection to the stop valve to determine the Three tests were run, the first to determine pounds of oil per hour, the second when burning oil at the rate of 1,500 pounds of oil per hour, and the third test when burning oil at the rate of 3,100 pounds of oil per hour. Details of the tests are as_ fol- lows :— Test No. 1 Approximate rate, 2,300 pounds of oil per hour. Test begun 5 Pp. in; Bebe id Ie ended, 11 p. m., Feb. 7, 1916. Seven burners fitted with 5/64-inch tips and 3/64-inch plugs were used. Two oil pumps, two _ feed- water pumps and two feed- water heaters were in operation throughout the test. There was some vibra- tion on several occa- sions during the trial, due fto lack of care with air regulation. No smoke was_ ob- served during the en- tire trial, (Asmat excess of air was sup- plied. At 8 p. m. one feed pump broke down and oper- ated indifferently during the remainder of run. The casing of the boiler, especially the left side in wake of lower rows of tubes at back, became red hot in places, indicating insufficient lagging behind the brick Test No. 2 ae Approximately 1,500 pounds of oil per hour. Test began midnight, Feb. 7, 1916; ended at 6 a. m., Feb. 8, 1916. Seven burners were used. 1/l6-inch tips and 3/64-inch plugs. 4 The burners used had One oil pump, one feed-water pump and one feed-water heater were in operation. The conditions were very steady during the entire trial. The combustion was excellent. The casing became quite hot at sides near back of. boiler. No smoke was_ observed during the entire’ run.