Pump nameplate

It is the rated head and flow rate of the conveying medium.

It’s water; data from a clean-water test.

The last edit to this post was made by ylb913 on 2016-5-29 at 07:18. Of course, the manufacturers of pumps use clean water for testing their pump performance. However, a few points need to be clarified here: 1. The flow rate of a pump is generally expressed in \"cubic meters per hour\", while the head is expressed in \"meters\". Such flow rates and heads are independent of the medium being pumped; in other words, regardless of the medium, its rated flow rate and head remain the values indicated on the nameplate, namely \"cubic meters per hour\" and \"meters\". 2. However, when pumping media with different densities, the pressure at the pump outlet varies. If the inlet pressure of the pump is at atmospheric pressure and the head is 200 meters, and the fluid being pumped is plain water with a specific gravity of 1, then the outlet pressure of the pump at rated flow rate is 20 kg/cm2. When pumping oil with a specific gravity of 0.8, the outlet pressure at rated flow rate is 16 kg/cm2. For sulfuric acid with a specific gravity of 1.8, the outlet pressure at rated flow rate is 36 kg/cm2. Of course, the inlet pressure of the pump is not necessarily 0 (gauge pressure); in such cases, the actual outlet pressure of the pump is equal to the inlet pressure plus an additional value. For example, if the pump is used to handle liquefied gas, it’s clear that the pressure of liquefied gas cannot be 0. Assuming the inlet pressure of the pump is 10 kg/cm2 and the specific gravity of liquefied gas is 0.53, then the outlet pressure of the pump will be 10 + 10.6 = 20.6 kg/cm2. 3. The most important issue is that, when pumping media with different densities, the size of the motor required for the pump varies. Because the formula for calculating the effective power of a pump is: Ne=QHρg. As mentioned earlier, Q and H remain constant; g is the acceleration due to gravity, which is also a constant. The only remaining factor is the specific gravity of the medium. In other words, the lower the specific gravity of the medium, the lower the effective power of the pump at its rated flow rate, and the smaller the motor required for the pump; vice versa. ——In fact, when the design institute carries out the design, it is the institute that decides on the size of the motor, and then the pump manufacturer prepares the pump according to the requirements set by the design institute.

So, are the power and efficiency values on the pump’s nameplate determined based on water as the medium or oil as the medium?

Using clear water as the experimental medium, the experimental data,

Agree with the sofa’s view. Others say it should be clean water, which makes sense, but as far as I know, everything is determined based on the specified parameters at the time of purchase: the medium, flow rate, head (pressure), viscosity (if any), and density.