Overcurrent in the motor of the diesel hydrogen injection pump; seeking cause analysis
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1. Our company’s diesel hydrogenation feed water pump, model: GSB-Q-5/1100. The designed medium is deoxygenated water; the medium temperature is 104°C, and the medium density is 995 Kg/m3. The designed flow rate of the pump is 5 m3/h, with a minimum operating flow rate of 2 m3/h. The actual operating flow rate ranges from 2.5 to 3.5 m3/h, and the operating current is around 140 A. The deoxygenated water has now been replaced with softened water at 40°C; all other parameters remain unchanged. The operating current of the motor keeps rising – the initial current after startup is around 145 A, and after 24 hours of operation it reaches around 210 A, which exceeds the motor’s rated current of 202 A, resulting in the motor operating under overload conditions. 2. Upon disassembling the pump for inspection, mild cavitation was found at the edges of the pump impeller, as well as at the flow channels of the pump body. 3. Please help analyze: 1. What is the impact of deoxygenated water and softened water on high-speed rotary pumps? 2. What is the impact of cavitation in a pump on its current?
Could you provide detailed information on the pump? I don’t even know how to calculate the shaft power based on its efficiency
It would be best to provide the performance curve of the pump; based on your current requirements, the motor should be around 110 kW
Hello, the efficiency of the pump is 18%, the shaft power is 82.85 KW, and the motor power is 110 KW. I need to look up information regarding the specific performance curve of the pump! Is it convenient to contact by phone? 15954751463
I’ve also encountered situations where the current increased gradually, by about 2 amps per day. Upon inspection, it was found that there was a hole in the balance tube at the outlet section due to cavitation and erosion, which caused severe backflow!