Affinity Law of the Pump at various condition

Affinity Law of the Pump at various condition

When Only Impeller Dia. Changes & Speed Remains The Same	When Only Speed Changes & Impeller Dia. Remains The Same	When Both Dia & Speed Change
Q2 = Q1 x (D2/D1)	Q2 = Q1 x (N2/N1)	Q2 = Q1 x (D2/D1) x (N2/N1)
H2 = H1 x (D2/D1) ²	H2 = H1 x (N2/N1) ²	H2 = H1 x { (D2/D1) x (N2/N1) }²
P2 = P1 x (D2/D1) ³	P2 = P1 x (N2/N1) ³	P2 = P1 x { (D2/D1) x(N2/N1)} ³

Where, Q1, H1, P1, D1 & N1 Are Capacity, Head, Input Power In Kw, Impeller Dia. & Speed At Initial Condition.

Where, Q2, H2, P2, D2 & N2 Are Capacity, Head, Input Power In Kw, Impeller Dia. & Speed At Changed Condition.