Heating and ventilating buildings : a manual for heating engineers and architects . 16 36 15 172700:31001600 1800 9/32 3/8 10 40 3 385 184000 9/32 3/8 12 40 3 462 46002200 9/32 3/8 12 52 3 600 24 56002800 5A6 3/8 12 70 3765 2670005200 5/6 3/8 4 70 3901 2880005400 60 16 /3» 1/2 16 83 3 1206 66163/8•A16104 1504 32 37 10500 125007200 7500 Fifteen square feet of surface to each horse-power. 79. Locomotive and Marine Boilers. — Boilers of thehorizontal tubular type with a fire-box entirely enclosed andsurrounded by heating surface are usually termed locomotiveboilers from the fact that such constru
Heating and ventilating buildings : a manual for heating engineers and architects . 16 36 15 172700:31001600 1800 9/32 3/8 10 40 3 385 184000 9/32 3/8 12 40 3 462 46002200 9/32 3/8 12 52 3 600 24 56002800 5A6 3/8 12 70 3765 2670005200 5/6 3/8 4 70 3901 2880005400 60 16 /3» 1/2 16 83 3 1206 66163/8•A16104 1504 32 37 10500 125007200 7500 Fifteen square feet of surface to each horse-power. 79. Locomotive and Marine Boilers. — Boilers of thehorizontal tubular type with a fire-box entirely enclosed andsurrounded by heating surface are usually termed locomotiveboilers from the fact that such construction is common onlocomotives. Boilers of this style are sometimes used for sta- 162 HEATING AND VENTILATING BUILDINGS. tionary power purposes, and possess the advantage over theplain tubular boiler of requiring no brick setting. They arenot, however, as strong in form as the plain tubular, since largeflat surfaces have to be used over the fire-box. Marine Boilers.—A cylindrical boiler with an internal cylin-drical fire-box is principally used on large boats. The fire-box. Fig. 115.—Locomotive Boiler. is often corrugated. This form of boiler is very strong andefficient, but because of cost of con-struction has been little used for station-ary purposes. Vertical Boilers.—Vertical boil-ers of large size are made in everyrespect like the horizontal tubular boiler,but are set so that the flame plays di-rectly on one head and the heated gasespass up through tubes. These boilersare generally provided with a water-legwhich extends below the lower crownsheet and is intended to receive depositsof mud, etc., from the boiler. They areusually made so that the heat passesdirectly out of the top of the flue, butin some cases the heat is made to passdown a portion of the length of the ex-ternal shell before being are economical in the use of fuel and occupy very small amount of floor-space ; they require,
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