“ A bore is only as good as the pump you use”, is an old saying going back a long way in the drilling industry. A pump is only as good as the way it is installed. To work efficiently and reliably, down hole submersible pumps need to be matched to the bore and installed correctly with the correct pump controls suitable for the intended application.
Correctly sized electrical cable needs to be used, matched to the kilowatt and amperage draw of the pump, as well as depth of pump installation to allow for voltage resistance over the length of the electrical cable. Too small a diameter cable will result in motor failure or continually tripping of circuit breakers and in some cases where no circuit breaker has been used, even fire. Too large a cable diameter will result in poor efficiency and added cost. Proper submersible heat shrinks need to be used to seal underwater joins and all systems need to be properly earthed.
The “rising main”, that is water delivery pipe, needs to be of sufficient pressure rating and diameter to sustain pressure loads and still deliver adequate flow rates without being restricted by friction loss. All pipe fittings need to be of the same or better pressure rating as the rising main.
The pump should not be allowed to hang freely on the rising main and electrical cable, but should be secured by a stainless steel support cable of suitable size and rating to support the pump and column when full of water. The support cable should be secured to the well head fitting which in turn should be able to transfer the weight to the concrete surface pad around the top of the bore casing.