Definition
HEAD is the height at which the pump delivers the required amount of water.
Calculation of HEAD
When one does not know the head, we need to know the following information when calculating:
1. Flow rate(capacity)
2. Vertical height (fall)
3. Pipe distance
4. Pipe layout, pipe diameter, pipe material
and then use the formula to calculate.
Formula:
Design head = vertical height + pipe loss + accessory loss + required outlet pressure
For example: the required flow rate is 200m³/h, the total length of the pipeline is 1100 meters, the vertical height is not known, and the slope is 30 degrees. It is planned to use DN200mm seamless steel pipe, which requires an outlet pressure of 10kg. Check the sine function value as required, at 30 degrees, it is 0.523.
Substitute into the formula: 1100 meters * 0.523 = 575 meters, that is, the vertical height is 575 meters.
Then check the pipeline loss, DN200mm, Q=200 m³/h, the straight pipe 100m loss is 2.1m, 1100m is 11x2.1=23.1m, the outlet pressure is required to be 10kg, equivalent to about 100m.
The design of this pump is 575+23.1+100=698.1 meters.
In addition to the loss of valves and elbows, the HEAD of the pump should be no less than 700 meters.
