Sunday, June 27, 2010

Water Supply

I've set up a small pump and pressure tank so that I've got water when I need it.  Eventually I'll install a submersible pump that goes down inside the well, but in the meantime this will suffice... at least until winter.

The system works like this:

  • The pump draws the water out of the well and puts it into the pressure tank.
  • The pressure tank contains compressed air (18 p.s.i) and a water bladder.  As the water bladder fills up, it compresses the air even more.  When the air pressure inside the tank reaches 40 p.s.i., the pump shuts off.
  • When you open the tap on the pressure tank, the air pressure inside the tank pushes the water out.
  • When the air pressure inside the tank gets down to 20 p.s.i. (i.e. when the tank is almost empty), the pump comes back on and fills up the pressure tank again.
The purpose of having the pressure tank is so that you can get water without having the pump come on every time you opened the tap.  It also gives you water that comes out at a constant pressure. 

Without the pressure tank, every time you opened the tap, the pump would come on, even if you were only getting a few ounces of water.  The pump would be turning on and off many times a day. 

By incorporating a pressure tank, the pump only comes on when the tank is almost empty.  This saves a lot of wear and tear on the pump.


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