A submersible well pump is designed to
operate beneath the earth’s surface. Like the sump pump found in many homes, a
submersible well pump will not work unless it’s completely submerged in liquid.
Unlike an above ground pumping system, which sucks water out of the ground, a
submersible is designed to push water to the surface.
Pumps can vary in size and there are
two basic types of submersible pumps used to deliver potable water,
shallow-well and deep-well. The typical submersible well pump consists of a 2
to 4 foot long cylinder that is 3 to 5 inches in diameter. This tube has a
hermetically sealed motor that is close-coupled to the body of the water pump.
Sealing the motor prevents water from getting inside and causing a short
circuit. The motor drives an impeller. When a pressure switch is turned on, the
impeller begins to spin drawing water into the pump. The water is then pushed
through the pump body and brought to the surface. The rest of the unit consists
of a cable connected to the motor and a pipe that transports the water to the
surface and into a storage tank.
The size of the unit is based on the
yield of the well and the needs of your household. The pump must be rated to
meet the normal peak demand of your household rather than simply average use.
One important rule is to never install a system that has a greater
pumping capacity than your well unless you need to use well storage along with
normal yield to meet peak demand.
The Advantage of Submersible Well Pumps
Above ground water pumps have a higher
rate of mechanical problems and failures because of the dynamics of pulling
water up from a well. Above ground pumps can lose prime causing the motor to
burn out and require replacement. Submersible pumps have fewer problems and can
last up to 25 years before needing to be replaced. Cavitation is a common
problem with above ground pumps. Submersible pumps are not subject to
cavitation problems due to the fact that they are usually deep beneath the
surface of the water.
Your well pump is the
heart of your drinking water delivery system. Using a submersible pump to push
water from your well to your home is an efficient and relatively maintenance
free means of providing safe plentiful drinking water for both you and your