Rwanda- Kigali Geothermal Project
Hot water diversion from geothermal mine for business purpose, and river water to be conveyed back to geothermal mine hole to protect from geologic hazard.
Geothermal mine located at plateau elevation 900m, vertical height approx.740m from river.
Semhai company manufactured and supplied all the submersible pumps and high-pressure booster pumps, detailed specifications as follows:
Submersible pump, 150WQ150-25-18.5, with performance 150m3/hr @ 25m; control panel with delta-star to provide full protection function and automatic running method.
Horizontal booster pump for stage 1, SHD155-67/8, with performance 155m3/hr @ 536m, body in cast steel and impeller in bronze, driven by special high elevation electric motor, 355KW/2900rpm/415V/IP55; control panel with ABB soft-starter provides full protection function. 2sets;
Horizontal booster pump for stage 2, SHD155-67/4, with performance 155m3/hr @ 268m, body in cast steel and impeller in bronze, driven by special high elevation electric motor, 200KW/2900rpm/415V/IP55; control panel with ABB soft-starter provides full protection function. 2sets;
All above pumps ensure river water fill in back geothermal mine hole in time to avoid ground subsidence caused by geothermal resource extraction. This project starts in 2012 and ends in 2017, during duty time all above pumps have been working well, with replacing the coupling sets for one time.