Are you interested in discussing the flow rate, head and shaft power of centrifugal pumps?
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The flow, lift and shaft power of a centrifugal pump are the most basic equipment parameters. Because they are too basic and too common, many people dismiss them. However, in fact, some people have worked in the mechanical profession for a lifetime, and they may not even fully understand these most basic parameters. Some old technologies, when purchasing a centrifugal pump, require Q=3m3/h for the process, and Q=10m3/h for the pump. They think it should be completely enough, but is this really appropriate? Also in the screenshot below, has anyone encountered the situation where the motor burned out due to the head being selected too high? And where can I find that formula? Aren’t these questions worth thinking about? (Why 0 replies)
Pump output power = flow rate* density * g * Lift/3600000 Generally, the flow is controlled and the equipment cannot be overloaded.
Because when selecting a model, most people pay more attention to the pumping flow rate and think that as long as the flow rate meets the requirements, it is enough. However, the head, which is an important parameter for pump operation, is used to overcome the pressure loss along the entire pumping pipe network, the local pipe network resistance, and the net high pressure difference within the system. If the lift is chosen too small, the fluid cannot be delivered to the specified location as required. ； If the lift is chosen to be too large, it will definitely cause the system energy consumption to increase. If the motor capacity is not configured appropriately, it can easily cause overloading.
Feel the same. The flow rate really must be accurate, because general pumps have an optimal working range. Sometimes a 10m3/h pump may not be able to be adjusted to 3m3/h because it is limited by the minimum continuous flow rate of the pump. Let’s talk about the lift. If the lift is chosen to be large, except that it will not save energy, generally speaking, the outlet valve can be used to eat up the extra pressure boost. However, it is worth noting that for pumps such as circulating pumps that do not have a regulating valve at the outlet, if the head is selected to be large, it is easy to cause the actual flow rate to be too large, the shaft power to be too high, and it is especially easy to overcurrent.
No one is willing to take responsibility, and they all leave a safety margin