The Isolated Plant Volume 1-2 (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. 1908 Excerpt: ...the U piece. It is satisfactory, however, with moderate expansions up to an inch or inch and a half, provided care is taken to guide the ends of the pipe and the fittings connecting the pipe to the U take the strain in a straight line. These fittings should be extra heavy and the U piece should have its flange an integral part of the pipe, or at least the ends of the U should be bent to meet the pipes end to end, so that the strain will be direct compression or tension. (d) Where head room permits, the expansion may be provided for by use of screwed fittings taking the expansion by screwing in and out of the fitting, as indicated, the loop either being run up (preferable) or down. In the former case, the pipes and in the latter the loop must be drained. For piping up to 8 inch, where the expansion is not excessive, this arrangement serves the purpose, but with greater expansions leaks will develop, due to the wearing of the threads, and due to twisting and untwisting action. This method is largely used for taking care of the expansion of heating risers and other compression work, where the tendency to leakage is greatly reduced. A spring piece is placed in line at right angles to general run. This is very generally used for short expansions. When the spring piece is very long in comparison with the diameter and the amount of expansion is small it works well. It is particularly adapted to short lengths such as connections from boilers into a header or from an overhead main to one underground; where the expansion is great there will almost surely develop a leak at one of the joints as noted on diagram, due to the compression of one side of the filling and tension of the other. Unless the fittings are extra strong with heavy bolts this combined compression and...