A Textbook on Plumbing, Heating, and Ventilation Volume 2 (Paperback)

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. 1897 Excerpt: ...this difference in pressure, the sizes of the branches upon the different floors should be decreased as they descend. Thus, in the figure the top branch is 1 inch and the lowest inch. By this system of distribution a nearly uniform supply of water can be given to each floor in a high building. 1031. Pipes which rise from a service pipe in the basement and ascend to the upper stories usually should not be reduced in diameter until the last branch is reached. This is because the pressure grows less as the height increases, gsBgo..3 and to secure a satisfactory flow on the upper floors, the pipes must "-.u ig=jy# glpgj9 be large in diameter. Even if the head is so great that there is plenty of force on the upper floors, s jf tne pipes be reduced in diameter, they will be liable to annoyance from the action of the faucets in the lower stories. If a faucet in the basement be opened, for example, the flow from a faucet on the top floor, which happens to be open at the same time, will be checked or even stopped. The size of the corporation cock which may be attached to a street main is usually determined by the water department. The diameter of the service pipe should not be governed by the size of the corporation cock, however, but should be determined solely by the requirements of the building. If the quantity of water required is very large, the water authorities will, upon due presentation of the facts, usually allow a larger connection to be made to the water mains. it 1032. The following sizes of branches are commonly used in buildings where the pipes are s r not of great length. If the pres Fig. 362. sure is less than 20 lb. per sq. in., the system may be rated as low pressure, and if above 20 lb., as high pressure: PURIFICATION OF WATER. 10...