Author:

Publisher: Forgotten Books

Published: 2017-11-18

Total Pages: 300

ISBN-13: 9780331332308

Excerpt from Lectures on Fire Insurance: Seasons of 1914 1915 1916 The max1mum allowable length of the smaller mains between supporting larger mains is dependent very largely upon the spacing of the 12 and 16-inch secondary feeders, and somewhat upon the initial pressure available. The maximum of 600 feet for a 6-inch pipe is intended to apply to the type of system most often found, with 12 or 16-inch mains or feet apart in either directions, and carrying such pressures that the total friction loss in the distribution system should not be allowed to exceed 15 or 20 pounds during maximum draft. There are some systems having secondary feeders not more than or feet apart, or with an unusually high initial pressure, where an unsupported length of or feet of 6-inch pipe will still be able to furnish adequate hydrant supply at pressure not too greatly reduced. For pipe extensions into newly developed districts, where the gridiron, as well as the supporting system of large mains is likely to be incomplete for some time, a number of progressive departments are using 8-inch as the minimum size. Other cities have in years past adopted the contrary policy of laying 4-inch mains into new sections, on the theory that the demand would be light, and no larger Size was justified, and with the result that as these sections became more closely built, it was difficult to secure an adequate system without replacing the smaller sizes. However, it is at present the almost universal practice to lay no pipe smaller than 6-inch for hydrant supply. A recent summary of the practice in 25 cities in New England, and New York shows only one where 4 - inch is still being used; in most of them the 4-inch is gradually being replaced and in a few others there is none in service. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.