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TRIALS OF VARIOUS TYPES OF MARINE

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Originally appearing in Volume V04, Page 151 of the 1911 Encyclopedia Britannica.
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TRIALS OF VARIOUS TYPES OF MARINE BOILERS Grate Heating Surface burned in Stoke- Draught- Per jb. of coal. ated per Thermal of Description of Boiler. Area of Trial per sq. ft. hold- Inches of sq. ft. of Units per Boiler sq. ft. sq. ft. Hours. of Grate Inches of Water. Heating jb of Coal. 7Jo per Hour. water. Actual. From and Surface. at 212° F. lb. lb. 115. Ordinary cylindrical single- 81 2308 25 14.2 Nil 0.36 8.56 10.26 4.26 14,267 69.7 ended; 3 furnaces; 155 lb „ „ 24 13.9 0.50 8'84 10.33 4'32 14,697 68•o working pressure; closed „ 9 30.3 o•81 0.39 7.93 9.27 8.46 14,686 61.4 stokehold system ' ,, „ 8a 29•I 0.65 0.32 8.84 10.34 9'05 14,612 68.4 Ordinary cylindrical single- 2876 in boiler, In Ash- ended; 3 furnaces; 210 lb 63.2 66 in air 13 20.6 pit 0.58 11.30 12.33 5.14 14,475 82.3 ashpit, Howden system working pressure; closed" heaters 1'53 Niclausse water-tube; 160 lb 46 1322 8 12.8 Nil 0.20 8.41 10.15 3.75 14,680 66.9 working pressure 8 21.9 „ 0.20 8•oi 9.40 6.11 14,760 62.1 37 20.2 0.29 7.62 9.00 5.44 14,600 60.5 34 990 9 14.0 0.10 0.23 8.77 10.50 4.17 14,640 69.8 Niclausse water-tube; 250 lb „ „ 9 22.0 0.27 0.23 7.68 9.06 5.74 14,640 60.4 working pressure 90 15.4 Nil Not ascer- 7.61 9.08 4.00 14,630 59'9 Babcock water-tube; ' in. tubes; 260 lb working r 36 Iwo 9 13.0 „ 0.26 9.31 I1.02 4.30 14,590 73.2 3ifi J 9 20.0 o•18 0.20 8.58 IOII 6.13 14590 67.0 tained pressure 90 14 5 Nil Not ascer- 8 09 9'53 4,18 63.1 tained 62 2167 28 18.4 „ 0.45 8.94 Io.61 4.61 14,520 70.7 24 19'2 „ 0.47 8.93 10'59 4.82 14,390 71.1 Babcock water-tube; I fa in. 12 20.5 0.42 9'42 11.04 5.41 14,080 75.8 tubes; 270 lb working 7 28.9 0•'50 Not ascer- 8.54 9.88 6.91 14,390 66.3 pressure tained 30 19.9 Nil 0.38 10•11 12.00 6•o1 14530 79.9 29 27.I o•66 0.23 9.96 11.67 8.05 14,630 77.1 Belleville water-tube with ( 44 910 in boiler 24a I5.8 Nil 0.36 9.65 II.46 4'94 14,697 77'2 economizers; 320 lb j " 447 in econo- 24 17.4 „ 0.39 9.33 I I.00 5.30 14,805 71.8 working pressure l „ miter; II 19.8 „ 0.43 9'39 11'03 6'38 14,578 73'3 ,, 1357 total 8 27.2 „ 0.39 8'28 9.79 7.78 14,611 65.0 56 2896 26 16.9 0.31 9.57 IT .45 3.12 14,750 75.0 26 18.2 „ 0.31 9.37 11.33 3.30 14,500 75.7 Yarrow water-tube; 14 in. „ „ 25 21.3 0.31 8.83 10.45 3.63 13,500 75.2 tubes; 250 lb working.. 30 35.4 0.53 0.26 8.82 10.59 6.04 14,430 70.9 pressure 8 41.9 0.86 0.31 8.24 9'94 6.69 14,500 66.3 8 33.7 0.31 0.30 8.39 9.93 5.47 14,680 65.4 8 39.8 0.82 0.24 8.85 10.43 6.81 14,530 69.5 71 26 16.1 Nil 0.39 7.95 9.50 3.24 14,500 63.8 26 17.7 „ 0.30 7.06 9.28 3.43 14,620 61.7 „ 2671 in boiler, 25 21.1 0.31 7.62 9.08 4.05 14,650 60:3 Durr water-tube; 250 lb „ 140 in super- 7 33.8 0.70 0.36 7.72 9'29 6.59 14,570 62.7 working pressure heater; -i 8 26.7 0.33 0.35 7.86 9.26 5.30 14,320 63.1 g p „ 2811 total I 8 34.6 I•II 0.20 8•o2 9.53 7.02 14,230 64.8 22 34.8 0.73 o•,6 6.84 8•o6 6.02 14,430 54'0 24 29'9 0.35 0.12 7.62 9.00 5.75 14,240 61.2 •. 20 19.9 Nil 0.21 7.30 8'33 3.66 14,240 58.6 ' In the first three trials no retarders were used in the tubes. In the last trial retarders were used. 2 In this trial retarders were used in the tubes. ' The first four trials were made with horizontal baffles above the tubes; the last two trials with the baffling described in the text. to represent the bulk of the coal used during the trial. The periodic records taken are the weights of the fuel used and of the ashes, &c., produced, the temperature and quantity of the feed-water, the steam pressure maintained, and the wetness of the steam produced. This last should be ascertained from samples taken from the steam pipe at a position where the full pressure is maintained. In order to reduce to a common standard observations taken under different conditions of feed temperatures and steam pressures, the results are calculated to an equivalent evaporation at the atmospheric pressure from a feed temperature of 212° F. (J. T. MI.)
End of Article: TRIALS OF VARIOUS TYPES OF MARINE
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