Pump selection for chemical industry
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The calculated power of the pump is 6.24; what power should be selected in practice? Because I saw that the power values chosen by others as a final result differed significantly from this value, and the value above was calculated using the manual – so why not follow those calculations? --- Please take the time to have a look, expert :P
The shaft power is 6.24, so a motor with a power of 7.5 KW is selected
The motor power calculated to be 6.24 kW, but I’ve seen some people choose models with a power of over 10 kW; I’m not sure if I missed something when selecting the pump for my chemical processing application
Please clarify the concept: is it the motor power that is 6.24, or the pump power? For those with an axis power of less than 22 KW, the motor power can be calculated by multiplying by 1.25
That’s right; what I calculated is the motor power. I’m not sure why others chose a value that’s quite high – in the tens of millions
Have you considered the specific gravity of the material? Generally, the material used as a reference for shaft power is water, with a specific gravity of 1. For example, if you calculate that the shaft power required for this pump is 6.24, and if this pump is to be used to transport 98% concentrated sulfuric acid, then its specific gravity must be taken into account. The shaft power is multiplied by the specific gravity of 98% sulfuric acid, which is 1.84; this value determines the power rating of the motor that is needed
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For the selection of pump motors: 1. Special requirements from the owner, such as those regarding the end point of the performance curve； 2. The physical properties of the conveying medium; some media have extremely high viscosity at low temperatures, and such a situation is possible during the design phase, so the client also requests that this be taken into account ； 3. A pump may operate under various conditions; the most severe case should be taken into consideration ； 4. There is a discrepancy between the theoretical calculated values and those of the pumps actually manufactured; efficiency may be reduced as a result. Therefore, the selection manual recommends that for pumps with an axis power of <22 KW, the motor power should be calculated based on a factor of 1.25
I wonder if the pump efficiency has been calculated
Hello, after some consideration, it is calculated based on head, flow rate, specific gravity, and efficiency. Are there any other requirements for selecting pumps in the chemical industry?