Pump affinity laws :
For a particular pump the head developed & the discharge can be controlled, within certain limits, according to the affinity laws.
When only impeller dia. changes & speed remains the same
Q2 = Q1 x (D2/D1)
H2 = H1 x (D2/D1)2
BKW2 = BKW1 x (D2/D1)3
When only speed changes & impeller diameter remains the same
Q2 = Q1 x (N2/N1)
H2 = H1 x (N2/N1)2
BKW2 = BKW1 x (N2/N1)3
When both dia & speed change
Q2 = Q1 x (D2/D1)x (N2/N1)
H2 = H1 x (D2/D1) x (N2/N1)2
BKW2 = BKW1 x (D2/D1) x (N2/N1)3
- Q1, H1, BKW1, D1 & N1 ARE CAPACITY, HEAD, INPUT POWER IN KW, IMPELLER DIA. & SPEED AT INITIAL CONDITION.
- Q2, H2, BKW2, D2 & N2 ARE CAPACITY, HEAD, INPUT POWER IN KW, IMPELLER DIA. & SPEED AT CHANGED CONDITION.
Related Documents :
Pump Curves - 6 Types of head vs flow rate curves
Types of Mechanical Seals in Pump
How to start and stop a centrifugal pump
Cavitation formation in the pump
What is pump losses
Comments
Post a Comment