By H.H. Anderson

This e-book may be of important curiosity to all engineers and architects inquisitive about centrifugal pumps and generators. together with statistical info derived from 20000 pumps and seven hundred generators with capacities of 5gpm to 5000000gpm, this ebook deals the widest variety and scope of data presently to be had. Statistical analyses recommend functional equipment of accelerating pump functionality and supply helpful facts for brand new layout features.

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A I % efficiency increase is therefore allowed here before plotting. Use of Model with Superior Finish A highly polished surface on a model will result in a higher efficiency than the chart value since this model becomes a geometric replica of a larger machine which has the normal finish of the machines on the chart. For example, the efficiency of a full size machine, having a surface finish comparable to 4 microns, and a duty of 20000 lis is forecast by the test of a one tenth model of 200 lIs having a surface finish comparable to 2 microns.

The quantity pumped is equal to the throat velocity multiplied by the area of the throat and, therefore, is proportional to 40 CENTRIFUGAL PUMPS -v head x the area of the throat m Hence, the area of the throat is proportional to Q divided by where Q is quantity, 1 and the diameter of the throat is proportional to -{Qdivided by H /4. Therefore, the diameter of the throat to the diameter of the impeller is proportional to «s H m 1 /4 rev/min This, in turn, is proportional to that is to say, is proportional to the shape number.

For a given head H we can, therefore, say impeller diameter is proportional to ~ head divided by the speed. The absolute velocity leaving the impeller is regarded as the volute throat velocity or diffuser velocity, which, in turn is proportional to the impeller peripheral velocity, that is to say, is proportional to the ~ head. The volute throat is the largest section of the scroll preceding the expansion cone to the deli very branch. The quantity pumped is equal to the throat velocity multiplied by the area of the throat and, therefore, is proportional to 40 CENTRIFUGAL PUMPS -v head x the area of the throat m Hence, the area of the throat is proportional to Q divided by where Q is quantity, 1 and the diameter of the throat is proportional to -{Qdivided by H /4.