How Does Specific Gravity Impact NPSH in Centrifugal Pumps?

In summary, the head PSA (suction surface pressure) is equal to 2.31 times the pump pressure divided by the specific gravity of the liquid. This is an important factor in calculating Net Positive Suction Head (NPSH) and indicates the amount of head needed to push liquid through the pump. The specific gravity plays a role in this calculation as it affects the atmospheric pressure pushing on the liquid. NPSH is crucial in ensuring the pump can effectively draw in fluid without experiencing inlet cavitation. Additional resources have been provided for further understanding.
  • #1
WesTech
4
0
Head psa(suction surface pressure) = 2.31xP/specific gravity

This is one of the factors to calc NPSH. Shows how much head is pushing liquid through the pump.

What does the specific gravity have to do with surface pressure of a liquid before it goes into the pump? Isn't it just involving the atmospheric pressure pushing on the liquid?
 
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  • #2

What is NPSH Suction Surface Pressure?

NPSH stands for Net Positive Suction Head, and it is a measure of the pressure available at the suction side of a pump. The NPSH Suction Surface Pressure specifically refers to the pressure available at the surface of the liquid being pumped.

Why is NPSH Suction Surface Pressure important?

NPSH Suction Surface Pressure is important because it determines the ability of a pump to prevent cavitation. Cavitation is a damaging phenomenon that occurs when the pressure at the suction side of the pump is too low, causing bubbles to form and collapse, resulting in damage to the pump and a decrease in efficiency.

How is NPSH Suction Surface Pressure calculated?

NPSH Suction Surface Pressure is calculated by subtracting the vapor pressure of the liquid being pumped from the total suction head. The vapor pressure can be found in tables or calculated using the Antoine equation.

What factors affect NPSH Suction Surface Pressure?

The factors that affect NPSH Suction Surface Pressure include the type of liquid being pumped, the temperature of the liquid, the pump speed, and the geometry of the pump. The higher the speed and the lower the temperature, the lower the NPSH Suction Surface Pressure will be.

What is the recommended NPSH Suction Surface Pressure for a pump?

The recommended NPSH Suction Surface Pressure for a pump is typically provided by the manufacturer and is specific to each pump. It is important to operate the pump within the recommended NPSH Suction Surface Pressure range to avoid cavitation and maintain efficiency.

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