Steel Steamship HARVEY H. BROWN.
Report of Experimental Trip - Modern Coarse Freight Steamer Built by Detroit Dry Dock Company and Owned by Northwestern Transportation Company, Detroit. Mich.- August, 1894.
Test and report by Geo. C. Shepard, Cleveland, O.
The HARVEY H. BROWN, a steel steamer built for freight service upon the great lakes, was designed and built by the Detroit Dry Dock Company of Detroit, Mich, and engined by the Dry Dock Engine Works, both concerns being practically under one management. She was first put in commission in May, 1894, and has since been and was at the time of this test engaged in carrying iron ore from Lake Superior ports to Lake Erie ports, returning in water ballast, the round trip of about 1,800 miles occupying about a week.
Length, over all 359' 2"
Length, between perpendiculars 342' 0",
Beam, molded 42' 1",
Depth 25' 0'
Draft, light 13' aft, 2' 0" forward
Displacement ................................................... 2,485 net tons
Area immersed midship section 360.6 square feet
Area of wetted skin 17,335 square feet
Block coefficient of fineness . 828
Angle of entrance ................... 49' 44,
Draft, loaded 14' 11" aft and 14' 10", forward
Displacement 5,365 net tons
Area immersed midship section 608.2 square feet
Area wetted skin 23,332 square feet
Block coefficient of fineness .94
Angle of entrance 63 44"
The main deck is not decked over except by a strip of steel 3 feet wide around the sides. The spar deck is of steel and contains the quarters for the officers and crew. The engine is in the after end of the boat with working floor on the main deck, and the boilers are immediately forward, also on the main deck. The coal bunkers are on this deck forward of the boilers and extend the whole width of the ship. A ballast bottom 42 inches deep extends from frame No. 12 to frame No. 133, the entire width of the ship, and is divided into ten compartments, five on each side of the keel, and each having an independent connection to the ballast pump and to the seacock. The aggregate capacity of the ten compartments is 1,000 tons, and they are numbered 1-5 beginning at forward tank. The bottom of the ship is sheathed with oak plank 8 inches thick, from a point 20 feet aft of the stem, to within 40 feet of the stern post, and coming up 30 inches above the height of the keel. The ends are formed off with a plate 8 feet long, the space between plate and skin being filled with cement. The main engines are of the triple, inverted vertical type with the H. P. cylinder between the M. P. aft and the L. P. forward; air pump, bilge and cooler pumps driven by beam attached to L. P. crosshead; crank shaft 12 inches diameter, continuous, on four journals with H. P. crank leading, M. P. next and L. P. last in the sequence. The H. P. valve is of piston type operated by joy valve gear, while the M. P. and L. P. valves are double-ported slide valves worked by two eccentrics through Stephenson links. A jet condenser condenses exhaust from L.P. cylinder.
Dimensions: - H.P. 22" diameter; M.P., 35", L-P., 56" diameter, stroke, 44"; connecting rod, 11' 0"; ratio, 1-6. Air pump, 28" diameter, 19" stroke; trunk, 14" diameter.
Main boilers: - Two of cylindrical type placed side by side, fore and aft, sides covered. Diameter 13' 6", length 12" 2 7/16".
Furnaces: - Two to each boiler, 4' 0" inside diameter; one combustion chamber for each furnace.
Grates 5' 6" long; area, two boilers, 88 square feet,
Air opening in grates, two boilers, 24 8 square feet.
Number of tubes each boiler, 328; length 8' 3"".
Diameter of tubes, 2 ½ inches.
Heating surface, two boilers, 4,130 square feet.
Ratio grate to heating areas, 1:47.
Donkey boiler, vertical, 4' 0 ½" diameter, 8' 8" high; grate surface 8.7 square feet; heating surface 243.2 square feet; ratio, 1-27.9.
Steam taken from top of boiler through a copper pan fastened over opening to stop valve, Feed pipe enters on side of boiler below center and is continued inside by copper pipe reaching toward the bottom, Total weight of machinery and water, with 12" coal on the grates is 291.6 net tons, and this, with a mean horse power of 1,250, makes machinery, etc., weigh 466 pounds per I. H. P. Air supply of furnaces is furnished through Howden system of hot draft, which consists of a fan 4" 6" diameter driven directly by a pair of horizontal engines 5" diameter and 5"" stroke. From the fan, which is located in the engine room, a trunk leads through to the front of the boilers, where it enlarges into a large box in the boiler breechings, the lower side of the box being immediately above the upper row of boiler tubes. Passing vertically through this box are 412 3" tubes, 4' 6" long, and through which the gases must pass on their way to the uptake. The air is then taken down to the valves, admitting it above and below the grates. The fire doors and ash pit doors are air tight, and before opening the fire door for any purpose, the valves admitting air below the grates are closed. Retarders made of strips of iron 3/32" thick and 2 1/4" wide, twisted into a screw of four turns in the length of the tube, were put into all the boiler tubes before the return trip.
Propellor - Sectional, cast iron, four blades, 13' 2"' diameter, 16' 0" pitch; 49.48 square feet projected area.
Auxiliaries: - Duplex feed pump 7 ½" x 4 ½" x 10", taking water from hot well of air pump or from feed water heater which was made of 6" pipe 4' 0" long, and into the top of which the cold water from circulating pump and exhaust steam from auxiliaries entered, the heated feed water being taken from the bottom thereof.
Duplex service pump, 7 ½" x 4 ½" x 6".
Duplex ballast pump, 10" x 14" x 10".
Duplex circulating pump, 6" x 7 ½" x 8",
Fan engine, double, 5" x 5".
Electric engine, double, single acting, 8" x 7".
The ship was also provided with steam steering gear, windlass engine, capstan engines and cargo hoists.
Propeller shaft 12" diameter, 30,' 1 ½" long.
Smoke stack, one, 5'6" diameter, 40' high above the grates.
Apparatus used in connection with this test consisted of four indicators of well known manufacture, the springs for which had been accurately calibrated at the mechanical laboratory of the University of Michigan; a standard steam gauge, also calibrated at the same place, and by which the M. P. and L. P. receiver gauges on the engine were corrected; platform scales and spring balance for weighing coal and ashes; a 3-inch Union water meter for measuring feed water; standardized thermometers for measuring heat, and a taffrail log for measuring distances traversed.
One indicator was used for both ends of each cylinder, with short connections of large size. The steam for boiler gauge was taken from top of main steam pipe close to throttle. Temperature and draft of uptake were taken at a point 13' 0" above grates, and the temperature and pressure of air entering furnace was taken through holes in the ash pit doors.
The reading of the log was checked by noting time of passing points, distances between which could be measured on chart.
A Carpenter throttling calorimeter was attached to the main throttle opposite the opening into the steam chest. On account of lack of room the calorimeter was turned parallel with steam pipe by an angle valve.
The Marine Review
August 16, 1894