Effect of pump inlet pressure
Thread Content
When selecting a pump, there is often no information available regarding the inlet pressure. The basic principle behind most pumps is to create a local vacuum, which allows water or hydraulic fluid to be drawn into the pump. In the case of centrifugal pumps, low inlet pressure can lead to the formation of bubbles, which may damage the pump’s components or blades. On the other hand, too high pressure can cause sealing issues. However, when a pump is added to a high-temperature and high-pressure system, the inlet pressure of the pump itself is very high. If water is to be transported and the inlet pressure is 2 MPa, how should the pump be selected? ? ? I only know that this is harmful to the pump, as it isn’t a normal suction condition – in other words, the inlet remains under high pressure and stays open continuously. The pressure specified on the pump’s nameplate refers to the output pressure it can handle; I’ve never seen any requirements regarding the inlet pressure!! I hope experts can tell me how to take inlet pressure into consideration when choosing a pump, and whether any additional devices are needed
I think the question asked by the original poster is really good! Is the pressure resistance of the pump sufficient unless there are special requirements?
Excessive inlet pressure, axial force, and sealing all need to be taken into consideration
As far as I remember, the nameplates on pumps always indicate the head; I really hadn’t paid attention to the pressure issue. But it should be in the data table. When selecting a pump, it is necessary to provide the designed inlet and outlet pressures; only then will the manufacturer proceed based on this head value
The situation mentioned by the original poster is something that needs to be taken into account in booster pumps or circulation pumps; for ordinary single-stage pumps, I don’t think it’s necessary to consider it
Really? If you mention that there is pressure at the pump’s inlet, the manufacturer will take it into consideration. Generally, when the inlet pressure is greater than 5 MPa, domestic pumps usually cannot handle it
The design and selection will take into account the inlet and outlet pressures provided by the user
The inlet pressure of the pumps in the high-temperature and high-pressure circuits in many laboratories can reach 15 MPa. . . It’s the pump that is connected right after coming out of the reactor vessel. . The pressure outlet of the reactor is 15 MPa; there is no pressure relief valve connected
Our metering pumps have a special structure that imposes almost no restrictions on the inlet pressure, which is quite a feature.