When purchasing a pump, the density of the medium isn’t specified; is it generally assumed that the density is 1?
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When purchasing a pump, the density of the medium isn’t specified; is it generally assumed that the density is 1? Since it is a mixture of salt solution and organic substances, it is difficult to determine its density. If the provided density differs significantly from the actual value, what problems might arise once the pump is purchased?
Things like water pumps don’t matter much, but for special pumps used in phosphating and pickling processes, they are necessary, as this involves the selection of impellers as well as considerations regarding pressure and flow rate
The head of pumps is calculated and indicated based on water as a reference; when the density of the medium differs from that of water, an appropriate conversion can be made.
When purchasing a pump, it is necessary to have its data sheet, which should contain comprehensive information. Without this data, the pump manufacturer is unable to calculate and determine the motor power required. As the owner, you can provide the density range and normal density to the manufacturer for reference.
The value of density is related to the power of the motor
Regardless of the medium to be transported, how should the material be selected?
If the provided density is 1 and the actual density is lower than 1, there is no problem using it; if the actual density is higher than 1, the pump will trip due to excessive current under the same flow rate
When purchasing a pump, it is necessary to provide selection parameters, which include information on the composition and density of the medium, as well as temperature, inlet pressure, flow rate, and required head. Otherwise, the pump selected may not meet the operational requirements, leading to cavitation or exceeding the motor’s rated current
If the process engineer cannot provide the data and the equipment technician approves it, then the purchase is made; if the item turns out to not work well, the equipment technician quits.
Above 1.3, the motor power issue needs to be considered