# Modern Steam Boilers; Their Construction, Management and Use a Practical Handbook for Marine and General Engineers, Steam Users, and Students in Engin

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...out of a single plate, by hydraulic pressure, without weld or seam of any kind.; 1 The boilers are made and standardised in twenty-two sizes-from Fia. 104.--Cochran boiler. 3 feet diameter and 60 sq. feet of heating surface to 8 feet 6 inches in diameter and 1000 sq. feet of heating surface. A modification of the standard type of Cochran boiler is shown in Fig. 104; here the smoke tubes are longer, thus giving a greater heating surface. Evaporation of Cochran Boilers.--The following empirical formula is used to express evaporation of a Cochran boiler in terms of grate area and heating surface, assuming that the coal which can be burnt per sq. foot grate per hour varies from about 15 lbs. in the smallest size boiler, to about 21 lbs. in the largest boiler, and that water evaporated per lb. of coal varies from about 5 lbs. in boilers which have the lowest ratio V-to about 61 lbs. in those which G.A. have the highest ratio. Then if E = evaporation in lbs. per hour.j / _-13 G = grate area in sq. feet J-E = 26(G-2)5 +------H = heating surface in sq. feet J The first member of the formula represents the coal burnt per hour. The second member represents the water evaporated per lb, of coal. Vertical Multitubular Boilers: Vertical Tubes. A vertical multitubular type of boiler is illustrated in Fig. 105. These boilers are constructed by Messrs. the Cradley Boiler Co. for a working pressure of 60 lbs. per sq. inch and upwards. The fire-box and shell crowns are flat and stayed by means of screwed stay tubes, which are screwed into the fire-box crown, and beaded over, to withstand the action of the fire. The shell crown tube plate has a conical head or uptake attached, Pig. 105.--Vertical multitubular boiler. terminating in the chimney. The figures in Table 20 give the...