Re: Well: standard submersibe pump or variable pressure pump
Johnl,
Get a full written specification and quotation from the driller for option A and option B.
Be sure to include cables, ropes, pipes, pressure vessels, motor size and manufacture, subpump performance curve (flow rate and pressure) and manufacture, guarantees etc.
Then look up the golden pages and ask three or four pump suppliers to quote for the same system.
BTW have your water tested for bacteria, water chemistry and metals as soon as you can to enable you to design and install the appropriated treatment systems. These treatment systems may use water to "back wash" and may require water at a higher pressure. It is important to factor in this possibility when you are designing your pump system.
I googled the following:
Constant Pressure Pumps
Constant Pressure Pumps
[broken link removed]About Constant Pressure Pumps
Constant pressure pumps provide a constant sample flow through a variable and dynamic pumping speed. As water passes through the water line, the water pressure is sampled several times a second by the pressure controller which signals a microprocessor to control the pump, by speeding up or slowing down the motor, much like your cruise control on your car works. This allows for a consistent flow through the pump, and can vastly improve any submersible water pump application.
Conventional water systems use a constant speed motor to intermittently fill a medium to large pressurized storage tank. A constant pressure submersible pump uses variable speed motor and special electronic control. The variable speed motor generates and maintains a constant pressure while delivering the maximum amount of water that the system can produce. This variable speed eliminates the need for large tanks to store the pressurized water, and provides an even and consistent water flow throughout operation!
Constant Pressure Pump Benefits
[broken link removed] By continually adjusting the pump performance to meet the water demand needs, the pump eliminates pressure cycling during long periods of running such as with sprinkler irrigation systems, or submersible well pump applications. A constant pressure pump reduces turbulence and shear during the packing process leading to more uniform bed structures and less fines generation than traditional methods of packing using high pressure pneumatic amplifier pumps.
The electronic controller used on a constant pressure pump provides a safeguard against a variety of typical application hazards. You are protected against Rapid Cycling or water logged tank problems, short circuit to motor, under voltage, pump overload caused by clogging with sand or silt, and from running dry. Submersible constant pressure pumps provide all of these safety features, protecting your equipment and providing consistant water flow.
Immediate Benefits from a constant pressure pump:
- Constant and consistent water output from pump
- Eliminates need for large pressure storage tanks
- Reduction in turbulence and shear from output
- Longer equipment life under adverse conditions
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Constant Pressure pumps can vastly improve your pumping output needs, and can be used in a variety of applications.
aj