| Product(s): | WaterSight |
| Version(s): | 10.00. |
| Area: | Documentation |
Overview
When looking at individual pump values in WaterSight, the first thing is to identify if the flow and pressure are shared between different pumps or are for each individual pump. This can be checked in the admin >> hydraulic structures >> pumps. More information also available here, under the section "Pump measurements VS Pumps station measurements".
In case the flow or pressure signal are shared by different pumps, the status signal of each pump is required. If the status signal was not integrated into WaterSight, then all the values calculated for each pump are wrong and should be ignored (in that case the suggestion is to unassign the signals to these pumps under admin >> hydraulic structures >> pumps. If the status signal is available for each pump, then WaterSight can estimate the flow that goes for each pump, based on each pump curve, and with this the correct flow and head values for each pump are estimated. Therefore, if pumps share flow or pressure, when comparing pump flow and head values between WaterSight and other external data source, always make sure to filter for the periods where each pump is on!
For the pump head calculation, take a look at this article, under the section "Calculating Pump Head". If the pump head values obtained seem inaccurate, take a look at the discharge and suction pressure values, or discharge and suction level values. Please note that in case discharge and suction pressure are available, and if both sensors are located at very different elevations, it is recommended to fill this elevation under Admin >> Sensors. In case tank levels are being used to calculate pump head, the elevation of those sensors is also required (fill this elevation under Admin >> Sensors).
In case pump is variable speed type, it is normal that the head and flow operating points can be much below the full speed factory curve presented in WaterSight, as the pump will operate at lower speeds. More information about variable speed pumps can be found here, under Variable Speed Pumps section.
See Also
Prioritizing Pumps for Replacement