By Robert Neumaier
The advance of airtight (sealless) pumps during the last part century are traced and up to date layout ideas are defined. the present nation of the expertise is analyzed. The layout, functionality, and alertness of airtight centrifugal pumps and rotary displacement pumps are studied.
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Extra resources for Hermetic Pumps:: The Latest Innovations and Industrial Applications of Sealless Pumps.
Example text
L& . 16 18 Fig.. 23 An example from an installation by the Hoechst company showing the recovery time of investment costs relative to energy saving for variable speed control centrifugal pumps, Kuchler [2-7] has compiled a computer program for an installation by the Hoechst company which shows the recovery time for investment costs as a function of energy saving (Fig. 23). 1 Correcting the impeller output where the head is too great If the impeller characteristic curve does not agree with the required flow characteristics for the actual operating conditions, this can be corrected by changing the impeller outlet conditions.
If the required duty point is below the characteristic curve of the pump, the required values of Q and H can be matched as required by reducing the impeller diameter. e. pumps with a blade-less annular space as a diffuser device, the diameter of the impeller is reduced. For centrifugal pumps which have a diffuser for pressure conversion (this type is used mainly for multistage centrifugal pumps), the blades only are reduced and the shrouds of the impeller are left, refer to Fig. 24. \%%%%%\~ t7 /92 o t Fig.
M is obvious. m the increase in efficiency can no longer be considered worthwhile because of the substantially increased construction costs of the pumps. m. g. boiler feed pumps). g. m are also built. Fig.. m. 9 Suction capacity - net positive suction head (NPSHA) and cavitation [2-10] Large sums have to be paid out each year for the repair of centrifugal pumps because a large number of these machines are not correctly installed. A key factor in this is cavitation, a type of malfunction in pumps due to insufficient vapor pressure in the flowing fluid because the pump has not been correctly installed.
