Flow rates and head requirements:Number of pumps: 1+1, one in service and one on standby Unit flow: 4.583 m3/s Head: 5.30 m The system has two characteristic curves:o Hgmax (Geodetic Head) Maximum Head =(-)0.50 m (assumed value) (pump bay level 1.80 and reservoir level =1.30)o Hgmin (Geodetic Head) Minimum Head =(-)1.90 m (pump bay level 3.20 and reservoir level=1.30)To adjust the pumps flow to the flow required by the CCA cooling systems, the pumpswill be driven by variable speeddrives.The variable speed drive shall be required to fulfill the following conditions: Max. operating speed: 50 Hz (rated speed) Min. speed: 30HzMaximum efficiency hydraulic is ≥ 82% and minimum efficiency hydraulic is ≥ 80% in operating range.NPSH required in any point of the operating range: < 10 mThe curve must satisfy the most unfavorable points top and bottom with a 1.0m, as security to variations in load losses.The pumps could be put into service with the compression valve open.