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September, 1925 gaa ad MARINE REVIEW OF DIESEL FUEL OIL tu Ate Nea tetlacsidtw AEAL cen teow of Mets EC 23 VERY Diesel Engineer has, at sometime or other, probably asked himself the question, “How can I secure the most economical operation of my Diesel Engine as far as fuels are concerned?’? Sharples Engineers have an- swered this question conclusively in several articles recently published, the essence of which is contained in the following lines: There are distinct advantages to the oil engine user in being able to burn the heavier, so-called boiler fuel oils without difficulty in oil engines, instead of being confined to the use of the lighter Diesel fuels. Not only are the heavy fuels sold at a lower price, but they have, by volume, a somewhat greater heat value or B. T. U. content. The lighter oils are not always readily available on the market, therefore it is desirable that an engine be able to burn whatever fuel oil may be procured under all sorts of market conditions: In the past, four objections were advanced to the use of heavier fuels for Diesel engines: (1) Difficulties in handling oils that are viscous at normal temperatures. (2) Ignition difficulties. (3) Difficulties in burning oil after igni- tion. (4) Difficulties caused by the presence of impurities in the oil. The first three of these difficulties have been overcome by proper engine design. The fourth has been overcome by the absolute removal of water and other impurities from the fuel. ) Why Impurities Must Be Removed The impurities common to the heavy fuel oils consist of water and non-combustible material. Water, which is frequently present in pockets in the oil, causes erratic working and misfiring of the engine. Misfiring is responsible for the for- mation of carbon in the cylinders and in extreme cases may cause seizure of the piston. The non-combustible material, consisting largely of sand and rust from pipes and storage tanks, causes excessive wear and tear on cylinder liners and pistons. It is readily seen that an effective method of removing these impurities is essential. Super Centrifugal Treatment The Sharples Presurtite Super Centrifuge has solved this purification problem in the most satis- factory and economical manner. It removes the impurities more completely than either filter or settling tanks and produces a fuel that gives continuously dependable performance. In order to obtain entirely satisfactory purifica- tion of these heavy Diesel fuels it is necessary to heat the oils before centrifuging. With the ordinary centrifugal machine, one of the chief difficulties encountered has been the danger from escaping fumes that are developed when heavy oils are heated sufficiently for satisfactory cen- trifugal treatment. Eliminating Escape of Fumes from Heated Oil To overcome the temperature limitations imposed on the open type machine, Sharples has specially designed the Presurtite Super Centrifuge. The entire centrifugal operation is carried out in a totally inclosed housing within which the centrif- ugal bowl rotates. This air-tight construction is built to withstand any pressure developed by gases from hot oil. No gases can leak from the machine to constitute a fire hazard, with the result. that it is possible to centrifuge heavy oils at the temperature necessary to procure a satis- factory reduction in the solid and water content. Temperatures up to and above 200° F—often well above the flash point of the heavier fuel oils—may be employed with perfect safety, if that is required for satisfactory results. Conclusions from Actual Tests From actual tests run on representative Diese engine fuel oils, it was found that the Sharples Presurtite Super Centrifuge removed from 2.5 to 60 ounces of non-combustible solids from each 1,000 gallons of oil, the lower quantity being from the high gravity gas oils, the higher quantity from heavy fuels and Bunker C oils. The non-combustible material is seen under the microscope to consist of irregular crystalline sand, dirt and scale. The Sharples Presurtite Super Centrifuge re- moves this dirt and thus contributes to better operation and longer engine life When you think of centrifugal force—say SHARPLES The Sharples Specialty Company 2338 Westmoreland Street, Philadelphia Foreign Offices: Super Centrifugal Engineers, Ltd., Tatsumi Commercial Corporation, Ste. Ame des Appareils Centrifuge, Imperial House, Kingsway, London, W. C. 2, England Marine Insurance Building, Tokio, Japan Rue du Helder, Paris, France Domestic Offices: Boston, New York, Pittsburgh, Detroit, Tulsa, New Orleans, San Francisco, Los Angeles, Seattle HAVE YOUR SECRETARY FILL THIS QUT AND MAIL SHARPLES SPECIALTY CO. 23rd and Westmoreland Sts., Philadelphia, Pa. bre hh HARPLES O Diesel Fuel Oil. O Diesel Lubricating Oil. Names, Company. Address Please mention MARINE REVIEW when writing to Advertisers Without obligation on my part, send complete data on: