Motor power selection
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The motor selection should be based on the requirements of the pump. When installing a new pump that is intended to operate continuously, it is necessary to have a spare unit as well; what degree of power capacity should generally be reserved as a margin? Or is it designed for a certain multiple?
Based on the pump manufacturer’s samples or by consulting the pump manufacturer
According to general standards, pump motors should meet the following requirements: a flow rate margin of 10% and a head margin of 20%; therefore, the motor should generally have a 30% margin. However, the motors supplied by pump manufacturers these days usually only have a 15% margin.
This post was last edited by mrwangchao on 2011-6-6 22:11. The selection is made based on the performance parameters provided by the pump manufacturer; generally, for larger motors, a power value of 1.15 times the pump’s shaft power is chosen, and then a motor with a power level close to this calculated value is selected. For smaller motors, 1.2 times the shaft power is used as the reference. The shaft power of a pump is generally determined through performance tests conducted by manufacturers using water as the medium; for oils as the working medium, a shaft power of 1.15 times is sufficient. The density of oil is less than that of water.
Determine the allowance based on the size of the motor. Motor shaft power ≤ 15 kW; motor power = shaft power × 1.25 ； 15kW < motor shaft power < 75kW, motor power = shaft power × 1.15 ； Motor shaft power > 75 kW; motor power = shaft power × 1.1. I saw it in a sample from a certain company. I hope it’s useful to you.
Our company follows this approach when selecting the power of pumps: a 10% margin for flow rate and a 10% margin for head pressure. The motor shaft power is then calculated, with a safety factor of 5–15% applied to the motor capacity. The allowance is determined based on the specific requirements of the intended use ； For example, 5% is sufficient for water pumps.
There should be some general standard for this; I’m not exactly sure about the specific figure. LZ can, based on the general situation of daily chemical supplies in their own company, consult the relevant standards and apply them flexibly
Come in and learn a bit; seems like you’re just passing by