Circulation system pump selection issues
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Dear heroes, there is a question that has always confused me. The issue of pump selection for the circulation system. In addition to the resistance loss of the fittings and pipes on the pipeline, what other factors need to be considered to select the pump lift? For example, factors such as the boiling point of the medium should be considered, and how should they be considered? Then there is a fixed pipeline system. If the head of the normally operating pump unit is increased by 10 meters, what will be the adverse effects? Or let’s do an experiment. A set of pumps and a set of piping systems can operate normally. If the pump set is replaced with a pump set with the same flow rate and a head increased by 10 meters, what will be the consequences? Pump motor burned out, overloaded with current? Or is the pump system vibrating?
It can be controlled through valves or variable frequency adjustment. It is best to use variable frequency adjustment, which is beneficial to the operation of the pump and saves energy at the same time.
A set of pumps and a set of pipeline systems can operate normally. If the pump set is replaced by a pump set with the same flow rate and a head increased by 10 meters, if the pipeline design has no problem with pressure resistance, there should be no problem. If the existing pump motor is used and the pump type is changed, the motor load will increase. As for whether there will be current overload, it depends on the motor's rich coefficient. Since I don't know the model of your pump, it is difficult to determine whether the motor needs to be replaced. As for pipe vibration, there should be no problem.
Just add a valve and artificially increase the pipe resistance. Otherwise, the pump may discharge excessively and increase the circulation volume. Firstly, it is not energy-saving. Secondly, if the flow curve of the pump is exceeded, cavitation may occur.
I also want to know the answer to this question, because when I pre-select a pump, I always tend to have a higher head. . .
The lift and flow rate of the pump are inversely proportional. The selection is to select the best shaft power. Generally, the selection is 10% greater than the rated lift and flow rate, including equipment investment, energy consumption, etc.