Doubts about the efficiency of gasoline loading pumps
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The last edit to this post was made by gaodi913 on 2015-10-12 at 11:23. I’m not sure how to describe it – my gasoline loading pump has an estimated effective power of 130 kW, but the pump manufacturer chose a motor with a capacity of 200 kW. This results in very low efficiency; I’d like to know why
This efficiency is already quite high. The motor should be selected to be appropriately large; the power consumption during actual operation should be less than 200 kW.
The calculated effective power of 130 kW does not mean that the pump’s maximum power is also 130 kW; since the pump is designed with peak operating conditions and future capacity expansions in mind, its actual maximum power may be higher than 130 kW. The power rating of the motor is usually selected in specific tiers; it’s possible that your maximum power falls close to the 200th tier, which is why 200 was chosen for you. Conversely, the effective value for the pump is 130, but it’s not possible to choose a motor with exactly 130 of capacity; a certain margin is necessary, around 115 or 160. 160 represents one specific capacity level, and if the power required under maximum operating conditions exceeds 160, then a motor with a capacity of 200 must be chosen.
What type of pump have you chosen? The choice of pump type is also very important.
What are the rated flow, head, and density?
The efficiency of a pump system is the ratio of the pump’s effective power to the motor’s input power; obviously, the motor needs to be selected to be sufficiently large
Using a positive displacement pump can improve pump efficiency.