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viscosity is too low temperature is too low pump discharge pressure is higher than the systems pressure pump capacity is greater than the systems needs
excessive pump speed excessive suction head worn wearing rings gross pump misalignment
suction exhaust pressure discharge
noise and vibration an increase in discharge pressure an increase in suction pressure lifting of the relief valve
ensure feed water flow into the boiler keep the steam drum pressure high prevent water hammer in the feed line help the feed water flash to steam
shaft and impeller motor and pump shaft casing and impeller wearing rings lantern ring and impeller
capacity will increase capacity will decrease suction pressure will increase suction pressure will decrease
increase discharge pressure decrease pump capacity decrease pump cavitation decrease reaction ring clearance
（1）, （2） （2）, （3） （1）, （2）, （3） （2） only
varying the pump discharge pressure varying the pump return pressure rotation of the pump plunger rotation of the pump barrel
increased pump speed excessive pump discharge pressure too low of a tilting box angle low pump speed
discharge is continuous it has no internal valves upon accidental closing of discharge valve, excessive pressure will not build up all of the above are true
excessive internal leakage in the pump low discharge pressure and fluid flow excessive fluid level in the hydraulic reservoir operation of the pump at 100% efficiency
open the filter and inspect the elements check the lube oil pump discharge pressure check the lube oil header pressure check the pressure drop across the filter
mixed-flow pump axial-flow pump centrifugal pump displacement pump
Suction head Pump head Discharge head Total head
excessive drive motor speed excessive pump discharge pressure too low of a tilting box angle insufficient drive motor speed
gear vane screw centrifugal
closely observe the pump discharge temperature close off the discharge valve, and watch for a rise in pressure momentarily close off the suction valve, and watch for a rise in pressure use a clamp on ammeter and compare the readings to past records
primarily to lubricate the shaft seals due to the inability of this type of pump to lift water to cover the suction （eye）of the impeller to initially unload the pump by having its head pressure equal to discharge pressure in order to overcome the potential energy of water in the discharge line
湘公网安备 43130202000226号