1. Capacity (GPM) & Pump Speed (RPM) (Constant Impeller Diameter)
Q1/Q2 = N1/N2
Q1 = known flow, N1= known speed
Q2 = desired flow, N2= desired speed
2. Total Head (ft.) & Pump Speed (RPM) (Constant Impeller Diameter)
H1/H2 = (N1/N2)2
H1 = known head (ft), N1= known speed
H2 = desired head (ft), N2= desired speed
3. Brake Horsepower (BHP) & Pump Speed (RPM) (Constant Impeller Diameter)
BHP1/BHP2 = (N1/N2)3
BHP1 = Brake Horsepower (BHP), N1= known speed
BHP2 = Brake Horsepower (BHP), N2= desired speed
4. Capacity (GPM) & Impeller Diameter (in.) (Constant Speed)
Q1/Q2 = D1/D2
Q1 = known flow, D1= known impeller diameter
Q2 = desired flow, D2= desired impeller diameter
5. Total Head (ft.) & Impeller Diameter (in.) (Constant Speed)
H1/H2 = (D1/D2)2
H1 = known head (ft), D1= known impeller diameter
H2 = desired head (ft), D2= desired impeller diameter
6. Brake Horsepower (BHP) & Impeller Diameter (in.) (Constant Speed)
BHP1/BHP2 = (N1/N2)3
BHP1 = Brake Horsepower (BHP), D1= known impeller diameter
BHP2 = Brake Horsepower (BHP), D2= desired impeller diameter
1. Head (ft) = (____psi/____sp. gr.) X 2.31
Pressure (psi) = lbs / in2 sp. gr. = specific gravity
2. Pressure (psi) = (Head (ft) X sp. gr.) / 2.31
3. Velocity (ft/sec) = (.4085 X GPM) / pipe ID (in.)
4. Specific Gravity (sp. gr.) = wt. liquid / wt. water
