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. 1916 Excerpt: ...diameter that seems reasonable and by the usual methods compute the actual rate of discharge that this diameter would give. Then compare this with the value of q desired and if it is too large or too small assume a new size of pipe and repeat until the computed rate of discharge is approximately equal to that specified ...
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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. 1916 Excerpt: ...diameter that seems reasonable and by the usual methods compute the actual rate of discharge that this diameter would give. Then compare this with the value of q desired and if it is too large or too small assume a new size of pipe and repeat until the computed rate of discharge is approximately equal to that specified. Of course one should use only commercial sizes of pipe and not attempt to get a diameter to a fraction of an inch. Naturally if only commercial sizes of pipe are used the computed rate of discharge may not agree precisely with the value desired, and so the size pipe that gives the nearest to that should be chosen. If the conditions of the problem are such that at least a certain rate of discharge must be obtained, then a size pipe should be 1 If / is expressed by (60) this equation will be of the sixth degree. used which will give a slightly greater value than this rather than one just under it. In the problems of the text sizes of pipe are used in whole inches. Actual standard pipe dimensions are given on page 263. If good judgment is used, one should be able to get the correct answer within two or three trials at most. In order to do this it is necessary to carefully compare the rate of discharge computed with the value specified and then to estimate how much the area of the pipe might need to be increased or diminished to yield the proper result. In doing this it must be borne in mind that the velocity is not the same in pipes of different sizes. The larger the pipe the higher the velocity of flow and hence it will discharge more in proportion to its area than a smaller pipe. This is not a matter that is worth making any computations on for this purpose, but it might be noted that, all other things being equal, the rate of discharge varie...
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