. Principles and practice of plumbing . 2K 2H sy2 A 2H 11 % 15,000 14-6 14 2M 2M W2 A 2A 14 M 20,000 15-6 16 2M 2M 3M % 2A {.? A 25,000 17-6 16 m 2M m % 2% [i A 30,000 18-0 18 m 2M ZA % 2^ {A A 40,000 19-6 20 2H 2% 33^ % 2^ 310 ill A1 50,000 22-0 20 2M 2K sy2 2^ {.2 A1 The number and size of hoops are stated and the spac-ing for same are shown in Fig. 145. The proper size andspacing of hoops for tanks of other dimensions can readilybe computed by use of the diagram. Tanks located outdoors must be covered with a doubleroof, an acceptable construction being shown in plan inFig. 146, and in eleva
. Principles and practice of plumbing . 2K 2H sy2 A 2H 11 % 15,000 14-6 14 2M 2M W2 A 2A 14 M 20,000 15-6 16 2M 2M 3M % 2A {.? A 25,000 17-6 16 m 2M m % 2% [i A 30,000 18-0 18 m 2M ZA % 2^ {A A 40,000 19-6 20 2H 2% 33^ % 2^ 310 ill A1 50,000 22-0 20 2M 2K sy2 2^ {.2 A1 The number and size of hoops are stated and the spac-ing for same are shown in Fig. 145. The proper size andspacing of hoops for tanks of other dimensions can readilybe computed by use of the diagram. Tanks located outdoors must be covered with a doubleroof, an acceptable construction being shown in plan inFig. 146, and in elevation in Fig. 147. It myst consist of atight flat cover made of matched boards supported by joists, Digitized by Microsoft® g26 Principles and Practice of Plumbing and above this a conical roof. In the larger sizes the conicalroof must be supported by rafters extending from the top ofthe tank to the peak of the roof. The conical roof must be covered with galvanized sheetiron or a good composition roofing which is not Fig. 146Plan of Tank Roof Expansion Joint.—When a tank is supported by atower 30 feet or more in height, whether on the ground oron a building, an expansion joint of the approved typeshown in Fig. 148 must be provided in the discharge pipe at
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