Pump head equation

What is head of a pump?

This term is an important energy concept (EN 12723) in centrifugal pump engineering. A distinction must be made between the pump head and the system head. The pump head is the hydraulic power or pump output power (PQ) transmitted to the fluid handled relative to ρ · g · Q.

How do you calculate the head of a centrifugal pump?

The maximum pump head of a centrifugal pump is mainly determined by the outside diameter of the pump’s impeller and the shaft angular velocity – speed of the rotating shaft. The head will also change as the volumetric flow rate through the pump is increased.

How do you calculate pump head velocity?

Velocity Pressure Head1 Pa = 106 N/mm2 = 105 bar = 0.1020 kp/m2 = 1.02×104 m H2O = 9.869×106 atm = 1.45×104 psi (lbf/in2)1 psf (lbf/ft2) = 47.88 N/m2 (Pa) = 0.006944 lbf/in2 (psi)

How do you calculate total head?

Total dynamic head = elevation head + friction head loss + pressure head. A. Elevation head – is the vertical distance which the water must be pumped. It is the elevation difference in feet between the pumping level in the well and the pressure tank.

How do I calculate flow rate?

Q=Vt Q = V t , where V is the volume and t is the elapsed time. The SI unit for flow rate is m3/s, but a number of other units for Q are in common use. For example, the heart of a resting adult pumps blood at a rate of 5.00 liters per minute (L/min).

How do you convert pressure to head?

In simple terms, the mathematical constant 2.31 converts a unit of energy against gravity into a unit of force against any other area. This constant converts a foot of head of water into pressure: Head in feet of water divided by 2.31 equals pressure in psi, and pressure in psi times 2.31 equals head in feet.

What is the unit of energy head?

Head is the amount of energy per Newton (or per pound) of fluid.

What is the max head of a pump?

Maximum Head Lift is the total height from the source of the water to the destination or drainage point. This provides the power to move water over a distance.

What is velocity head formula?

If u is the velocity and g the acceleration due to gravity, the velocity head is defined by u2/2g. If the flow within a pipe, channel, or duct is uniform over a given cross-section, this definition of the velocity head applies to the entire cross-section.

What is pressure head in Bernoulli’s equation?

The “head” form of the Engineering Bernoulli Equation is obtained by dividing the energy form throughout by the magnitude of the acceleration due to gravity, g . for a pump, the head developed by a pump p h is always positive.

What is datum head?

known as velocity head or kinetic head and Z is known as potential head or datum head. The sum of the pressure head, the velocity head and the potential head is known as the total head or the total energy per unit weight of the fluid.

What does total head in feet mean?

Discharge Head: This is the vertical distance that you are able to pump liquid. For example, if your pump is rated for a maximum head of 18 feet, this does not mean that you are restricted to 18 feet of pipe. Total Head: Sum of discharge head, suction lift, and friction loss.

How do you calculate suction head?

Explanation: To calculate NPSH Available, take the source pressure , add the atmospheric pressure , subtract the losses from friction within the pipeline and subtract the vapor pressure of the fluid . The result equals the NPSHA (or Net Positive Suction Head Available) of your system.

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