The Application of Low Pressure Turbines (Classic Reprint)

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Excerpt from The Application of Low Pressure Turbines Inasmuch as a low pressure turbine works with substantially half the heat drop of a high pressure condensing turbine, its construction is more simple and there are fewer turbine elements. As the volumes of steam which pass through the turbine are comparatively greater, large blade passages are permitted, all of which conduces to the simplicity and ruggedness of the turbine and facility of design. In low pressure turbine applications, therefore, the skill of the engineer is frequently called upon, more in connection with the method of applying the turbine than in its actual design. It is the object of this pamphlet to set forth some of the considerations of which account must be taken in making such applications. The following may be cited as questions which arise when such an installation is contemplated. Is there enough steam for the low pressure turbine, and has its quantity been properly estimated? Although for preliminary purposes a sufficiently accurate guess of the available quantity of steam may be made, the use of indicator cards from the high pressure machines is advisable. The analysis of these cards may be made in a most satisfactory manner by the method described before the A. S. M. E. at Cleveland in May, 1912, by Mr. Paul Clayton. Steam meters furnish an alternative method of arriving at the desired figures, although the preferable procedure is a complete test of the boiler plant itself. It is advisable to make a deduction of 10% from the apparently available amount of steam to allow for the moisture in the exhaust from the engines. A second typical question is that of the governing of the turbine. Should this be accomplished by the direct application of a centrifugal device to the turbine, or should arrangements be made to tie together electrically the generators driven by the turbine and by the reciprocator furnishing the exhaust steam. If a governor is used, acting directly on the turbine, should it control the inlet to the turbine alone, or should it be connected to a valve in the low pressure line permitting a portion of this steam to pass directly to the condenser and thus lowering the back pressure on the reciprocating engines whenever possible, due to low load on the turbine? Should the turbine be complicated and its overall efficiency somewhat reduced by the addition of a high pressure element so that it will operate with passable efficiency on steam direct from the boilers? 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.