| Product(s): | WaterSight |
| Version(s): | 10.00. |
| Area: | Documentation |
Pump Measurements VS Pump Station Measurements
When looking at individual pump values in WaterSight, the first thing is to identify if the flow is 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".
If pump flow measurement is available at each individual pump, results for each individual pump should be accurate.
In case the flow signal is shared by different pumps, the status signal of each pump is required. If the status signal is available for each pump, make sure to assign the status signal to each pump in Admin >> Hydraulic Structures >> Pumps. By doing that, 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.
If the status signal was not integrated into WaterSight, then all the values calculated are related to the all pump station and values for each individual pump are wrong and should be ignored. Just in case the pump status signal for each pump is not available and in case the flow is shared between all pumps, it is suggested to:
- in the Admin >> Hydraulic structures leave the pumps tab empty
- only fill the pump stations tab.
- in this case Pumps page will be empty and only Pump Station details page will show the pump station operating points but no efficiencies will be calculated neither the combined pump curve (example below)
Pump Head calculation
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).
Variable Speed Pump
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