Centrifugal Pumping Machinery: The Theory and Practice of Centrifugal and Turbine Pumps

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McGraw-Hill, 1912 - Centrifugal pumps - 184 pages
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Page 39 - ... resistance does not continue. The elastic resistance is raised by the sliding, and consequently the sliding is limited. A stress-strain curve can be drawn which shows the increase of the limit of elastic resistance p with sliding ; the rate of increase of the former at any point may be measured by observing the angle which the tangent to the curve at that point makes with the axis of strain ; I will call this angle <f>.
Page 29 - Before starting new or unused centrifugal pumps, it is advisable to clean out the bearings thoroughly, including the thrust bearing, by pouring in kerosene and allowing it to run out at the bottom, as dirt is liable to get in during shipment or idleness.
Page 141 - It is claimed by one of the discussers that the test should have been made by the city at the exact capacity called for and the efficiency should have been based on the result of such a test. This doubtless would have produced a lower efficiency than that obtained. In the light...
Page 14 - ... guarantees and contracts. This ambiguity has been brought about by the fact that the word has been used without modification to designate the efficiency of the pump only, of the pump and prime mover, and of the entire plant measured back to the boiler.
Page 28 - On each side of the cage there should be placed about three rings of good hydraulic graphite packing. A J-inch pipe from the discharge of the pump should be run to the stuffing box and an opening connected through to the cage. This makes a water seal in the stuffing box and prevents all air leakage. The gland should be run as loose as possible, otherwise the packing is liable to cut the shaft. A small amount of leakage from the stuffing box does no harm, in fact is an advantage, as it prevents the...
Page 103 - The tapering piece of the giant is fitted on the inner side with two sets of guide vanes which prevent a scattering or rotary motion of the water after it has issued from the nozzle. The nozzles used...
Page v - ... primarily to set forth. This is not merely because of the large number of centrifugal and turbine pumps which this company has put out, but because it seems best to confine the work to actual experience and to such installations as have been in service sufficiently long to be beyond the experimental stage. No attempt has been made to go into the history of the subject, or to treat it from an elementary standpoint, as it is assumed that the reader is familiar with the laws of hydraulics. HARRISON,...
Page 29 - If the total head operated against is greater than that for which the pump was designed, the quantity of water discharged will be less than...
Page 27 - A combined bedplate for pump and motor should be leveled up by wedges, the pump and motor placed upon the facing strips and lined up so that the faces of the pump coupling are parallel, and the pump and motor run freely with and without coupling bolts in position. The bedplate should then be grouted into place so that it is absolutely rigid. After the foundation bolts have been permanently set the suction and discharge piping may be connected.
Page 40 - The equation to this curve, which is a logarithmic, spiral is r = ae™* when 1t' = 0. e = Napierian base, r = a. m is the point determined by calculation from the problem. In the ordinary type of turbine pump the water cannot take this path, except...

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