Will the pump experience cavitation under these operating conditions?
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Design parameters of the sac-type condensation pump: Operating parameters: Model 80LDTN-40×5; Inlet pressure: -0.065 MPa; Flow rate: 15 m3/h; Outlet pressure: 1.5 MPa; Head: 175 m; Flow capacity: 8 t/h; Efficiency: 58%; Temperature of water at the pump inlet: 55°C; Rotational speed: 2900 r/min; Height of the liquid level above the pump inlet: 3 m. There are 2 elbows, 1 gate valve, and 1 filter at the inlet, with a pipe diameter of DN150. NPSH: 0.72 m; Valve opening degree at the pump outlet: 22%-35%
Bro, there’s an issue with your inlet pressure. Bucket bag pumps produce liquefied gas at a positive pressure; therefore, there is always positive pressure. At the inlet side, however, the pressure is negative, which causes immediate vaporization, leaving no chance for cavitation in the pump. Also, you haven’t provided the vapor pressure of the medium being pumped, or you can provide the NPSHA for the unit instead. It’s impossible to tell this way
Forgot to mention the medium; it’s condensed water
The saturated vapor pressure of water at 55℃ is 15.743 KPaA, and your inlet pressure is 36 KPaA; theoretically, cavitation should not occur.