Well Pumps and Pressure Tanks


Read your manual for installation, operation, and safety information. This guide neither supplements nor replaces the Owner’s Manual.

Well Pumps and Pressure Tanks
The standard utility-powered water delivery system consists of a submersible pump or a jet pump that delivers drinking water into a pressure tank. A pressure tank extends the time between pumping cycles by saving up some pressurized water for delivery later. This system usually solves any freezing problems by placing the pump deep inside the well, and the pressure tank indoors. The down side is that the pump must produce enough volume to keep up with any potential demand, or the pressure tank will be depleted and the pressure will drop dramatically.

How to Replace a Tank

Cost (0-5 scale): 3
Difficulty (0-5 scale): 3

Items Needed:
• Tank
• Pipe
• Glue or Solder
• Pipe cutter
• Various pipe fittings

Step One: Preparation & Old Tank Removal

The first step is to remove your old tank. Begin by shutting off the electrical power to your well pump at the circuit or fuse box. Your water system needs to be drained of water. Open a cold water faucet or other discharge at the lowest point in your water system and allow all water to drain. Be prepared: You will be draining a large amount of water. Once water has drained, remove or cut the piping from your old tank. This should be done near the inlet and discharge of the tank tee. Remove and discard the tank. Clear work area.
Step Two: Installation
First, use a good tire pressure gauge and set the pre-charge air pressure of your new tank to 2 psi less than the turn-on pressure of the pressure switch that controls your pump. If that pressure is unknown, locate the pressure switch and remove its cover. Label under cover will list the turn-on pressure as “Cut-In” or “Cut-On” pressure.
Second, Install tank tee  (use Teflon tape!).
* Use caution. Tank flange is plastic and can be cross-threaded, melted, or cracked.
Third, install piping to connect your pump to the tank tee, and then the tank tee to your household piping.  
Step 3: Final Start-Up
Double-check your connections and tank pre-charge. 
For installations with submersible well pump, open several cold water faucets. Turn on the power to your well pump. Allow it to run and flush the system of air and any possible sediments that were disturbed while working with the piping. Keep in mind the open faucet will soon have full water pressure and flow.
For installations with jet pumps, open several faucets. Follow pump manufacturer’s instructions to re-prime the pump. Once primed. Flush the piping of air and sediments. Keep in mind you will soon have full water and flow at the faucets that are open.

Congratulations, very little time has passed by and you have successfully installed your new tank!