What is the relationship between pump head and discharge?
Imagine a pump where you have a pipe that extends straight up vertically from the discharge (see Figure 1). Figure 1: Imaginary vertical discharge pipe used to measure head. Simply stated: a pump’s head is the maximum height that the pump can achieve pumping against gravity.
What is the difference between head and discharge?
In a system with flow, the total head is the difference between the discharge and the suction head plus the friction head and the sum is less then the shut-off head. Suction and discharge static head are often combined. The difference between discharge and suction static head is the total static head (see Figure 8).
What is discharge head of a centrifugal pump?
If the discharge of a centrifugal pump is pointed straight up into the air the fluid will pumped to a certain height – or head – called the shut off head. This maximum head is mainly determined by the outside diameter of the pump’s impeller and the speed of the rotating shaft.
Is head the same as discharge pressure?
So, the discharge pressure is equal to the suction pressure plus the pump’s design pressure. The discharge pressure of the pump should be approximately equivalent to the total dynamic head (TDH) required by the system (tanks, pipes, elbows, valves, flanges and fittings).
How do you calculate the discharge of a centrifugal pump?
Discharge in centrifugal pump (Q) = pi * D * b * v. v = velocity of flow at the inlet. So, according to the formula, discharge is directly proportional to Diameter of the impeller.
How do you calculate pump head discharge?
The head is usually the maximum height that the pump can lift, and is indicated by H. The most commonly used pump head calculation formula is H = (p2-p1) / ρg + (c2-c1) / 2g + z2-z1.
What is total head in centrifugal pump?
Total Dynamic Head (TDH) is the amount of head or pressure on the suction side of the pump (also called static lift), plus the total of 1) height that a fluid is to be pumped plus 2) friction loss caused by internal pipe roughness or corrosion.
What does head pressure mean in water pumps?
Head pressure is a specific type of pressure used in pump systems. It is a measurement of the height difference between the fluid being moved and the discharge point. For example, let’s say you have a well of water that is 2 metres underground, and you have a tap and pipe system half a metre above ground.
Which formula is used to calculate the head for centrifugal pumps?
The power of the pump is 45 kW. Determine the pump flow rate, head, and power requirements if the pump speed is increased to 3600 rpm….Pump Laws.
| n | = | speed of pump impeller (rpm) |
|---|---|---|
| ˙V | = | volumetric flow rate of pump (gpm or ft3/hr) |
| Hp | = | head developed by pump (psid or feet) |
| P | = | pump power (kW) |
What is head on pump?
Put simply, head is the height at which a pump can raise fluid up and is measured in metres or feet. We use it when specifying centrifugal pumps because their pumping characteristics tend to be independent of the fluid’s specific gravity, often referred to as relative density.
How do you calculate discharge?
Discharge = V x D x W If length is measured in feet and time in seconds, Discharge has units of feet3/sec or cubic feet per second (cfs). Depth times Width gives the cross-sectional area. The shape of the channel is important because of the reduction in velocity due to friction along the channel margins.
What is the head of a centrifugal pump?
A centrifugal pump imparts velocity to a liquid. This velocity energy is then transformed largely into pressure energy as the liquid leaves the pump. Therefore, the head developed is approximately equal to the velocity energy at the periphery of the impeller.
What is a steep centrifugal pump?
Pump Performance Curve Shapes In a steep centrifugal pump curve, the arch of the curve is steeper, resulting in a larger pressure (head) decrease as the flow increases, compared to a flat and drooping curve. This type of curve may be applied for systems that have large pressure/differential pressure requirements with minimal flow variation.
What is the performance curve of a centrifugal pump?
What is Pump Head – Performance Curve of Centrifugal Pump – Definition. 2019-06-03. 2019-05-22 by Nick Connor. pump head is used to measure the kinetic energy which a centrifugal pump creates. It can be shown in the figure as the performance curve or pump characteristic curve. Thermal Engineering.
How is the static head of a centrifugal pump dependent on weight?
The static head corresponding to any specific pressure is dependent upon the weight of the liquid according to the following formula: A centrifugal pump imparts velocity to a liquid. This velocity energy is then transformed largely into pressure energy as the liquid leaves the pump.