Once the design of how to do the distribution of the irrigation installation has been defined, an estimate of the pressure losses will be made, also called pressure loss, in order to be able to correctly dimension the pumping equipment.
To do this, first of all, the route where the greatest load loss of the entire installation is produced should be identified, since this value will condition the performance that the pumping group must offer in order to guarantee the expected flow of water in each emissary.
Once the most unfavorable route has been identified, the load loss that occurs in those sections of the installation will then be calculated. The calculation of the head loss will be made by distinguishing three types, where each one will be determined with a different calculation procedure:
– A) Loss of load produced in straight sections of pipe;
– B) Loss of load produced in points and localized elements of the network;
– C) Loss of load produced in the emissaries or drippers.
- A) Loss of load produced in the straight sections of the pipeline For the calculation of the pressure loss that occurs in a straight section of pipe (Δp) of a length considered “L”, the following formula is used:
Δp = f * (L / D) * (v2 / 2g)