Page 40 - Know and Understand Centrifugal Pumps
P. 40
NPSH, Net Positive Suction Head
6. Convert to a pump with a double suction impeller. Double suction
impeller pumps are for low NPSH applications.
7. Use nvo smaller pumps in parallel.
8. Use a larger/slowcr pump.
Inadequate NPSHa causes stress, vibration and maintenance on pumps
because there is not enough energy in the fluid for the pump to
perform its work. As you can see from the previous pages, the problems
lie in system design and proper operating principles. When the NPSHa
is below the NPSHr of the pump, the conditions are favorable for the
pump to go into cavitation. Cavitation is the next chapter.
1 - " - -' 7 23 m
