Actual Head Rise of a Pump or Fan

The Actual Head Rise calculator computes the actual head rise for a pump or fan based on the change in pressure, head and velocity and the density of the material flowing through the pump or fan.

INSTRUCTIONS: Choose units and enter the following:

• (p₁) Pressure at point 1
• (p₂) Pressure at point 2
• (ρ) Density of flowing material
• (h₁) Head at point 1
• (h₂) Head at point 2
• (v₁) Velocity at point 1
• (v₂) Velocity at point 2

Actual Head Rise (h): The calculator returns the rise in meters.  However, this can be automatically converted to other length units via the pull-down menu.

The Math/Science

The formula for Actual Head Rise is:

`h = (p_2 - p_1)/(g*rho) + (h_2-h_1)+(v_2^2 -v_1^2)/(2*g)`

where:

• (p₁) This is the pressure at point 1.
• (p₂) This is the pressure at point 2.
• (ρ) This is the density of the flowing material.
• (g) This is the acceleration due to gravity.
• (h₁) This is the head at point 1.
• (h₂) This is the head at point 2.
• (v₁) This is the velocity of at point 1.
• (v₂) This is the velocity of at point 2.