Chemical centrifugal pump inlet diameter size head has influence?

Chemical centrifugal pump is common in the production of industrial pump, the installation of centrifugal pump, the water pump suction line usually is bigger than the entrance of the pump diameter, so the pump suction installation is reducing. Usually called reducer connection, about side suction type centrifugal pump, The water pump inlet for the level of import) The eccentric reducer on the inlet pipe installation problems, in the teaching material of pump pipe standards, its provisions for: the eccentricity on the horizontal tube reducing diameter orientation ( Horizontal section is up or down) Don't appear liquid bag or air bags ( Two cases) : 1, when the medium from the top downward into the pump, based on bottom flat eccentric reducer installation, not be liquid bag; 2, when the medium from the bottom up into the pump, based on top flat eccentric reducer installation, not a balloon; In one, the change of import and export of the pump diameter size have what use? Mainly in order to reduce the flow rate of the medium in the pipe, reduce the flow velocity in order to achieve reduce friction medium flow in the pipe. Centrifugal pump at the entrance to the level of eccentric reducer is generally based on top flat layout, but in reducer and upward bend bend under the condition of direct connection, can use the bottom flat layout. Reducer should be close to the pump inlet. Top flat installation is: to prevent the accumulation of gas in the eccentric reducing tube, and into the centrifugal pump, the cavitation damage of the pump. Horizontal suction centrifugal water pump suction diameter changes, pipe into the pump mounted with flat top from bottom to top, from top to bottom into the pump mounted with flat bottom ( In order to prevent the gas in the pump inlet accumulation has mounted with the top flat) , medium with impurities and suction velocity is lower than the sedimentation rate of impurities mounted with flat bottom. The principle is not formed air pocket. Cavitation and effusion emissions are the two major factors influencing the eccentric reducer installation. In general, if no special instructions, to consider the cavitation is given priority to, take the top flat installation. Top flat installation can prevent liquid bag or balloon pump suction generated cavitation, surge, affect the normal operation of the pump, this is also required by the standards of most of the overseas engineering company, there is a point of view on whether the pipeline medium containing solid impurities or particles to decide. Namely: 1, when the medium is a pure fluid, adopt top flat eccentric reducer installed, in order to prevent the pipeline pumping air generated tone corrosion, surge, at this time to produce low with adding low drainage or using low drainage pipeline filter; 2, when the medium containing solid impurities or particles ( Such as size, easy to produce the corrosive medium in the pipeline such as rust, etc. ) Bottom flat eccentric reducer are adopted in installation, in order to prevent the pipe low solid accumulation ( Might have an airbag) Pipeline; 3, about the pump inlet velocity, the choice of variable diameter tube flat top or bottom flat main consideration is to prevent the accumulation of gas or liquid in pipeline operation process, produce blind Angle. Generally choose by go down on the pipe end flat, go by next upgrade pipe select top flat, otherwise easy to generate a corner, to produce liquid bag or bag.
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