What are the 3 indications that a centrifugal pump is Cavitating?
Typical indications of cavitation:
- Noise.
- Vibration.
- Seal/bearing failure.
- Impeller erosion.
- Higher than usual power consumption.
What are the factors influence the pump suction condition?
Important factors affecting pump performance are surface roughness; internal clearances; mechanical losses, such as those related to bearings, lip seals, mechanical seals, and packing; high suction specific speed; impeller trim; and the viscosity of the fluid pumped.
What causes a centrifugal pump to lose pressure?
Excessive Clearances If clearances are too wide for the type of fluid pumped, excessive slip will occur. Fluid will continue to recirculate inside the pump, yielding lower flow out of the pump.
What is the affect of cavitation on Centrifugal Pump Performance?
Cavitation in a centrifugal pump has a significant effect on pump performance. Cavitation degrades the performance of a pump, resulting in a fluctuating flow rate and discharge pressure. Cavitation can also be destructive to pumps internal components.
Which factors influence the pumping capacity flow of a centrifugal pump the most?
Capacity is determined by the exit width of the impeller. The head and capacity are the main factors, which affect the horsepower size of the motor to be used. The more the quantity of water to be pumped, the more energy is required. A centrifugal pump is not positive acting; it will not pump the same volume always.
What determines the efficiency of a centrifugal pump?
A pump’s efficiency is determined by how effectively the pump can convert one form of energy to another, based on the difference between the horsepower going into and out of a pump. Ideally, the horsepower entering the pump would equal the horsepower exiting the pump; making the pumping system 100\% efficient.
How do you increase suction pressure?
One method for increasing the NPSHA is to increase the pressure at the suction of the pump. For example, if a pump is taking suction from an enclosed tank, either raising the level of the liquid in the tank or increasing the pressure in the space above the liquid increases suction pressure.