Suggested method of draining a pressure tank for a well fed plumbing system:
1. Turn off the pump.
2. Open a cold water faucet.
3. Pump air into the tank air valve slowly enough to keep the air pressure at or under 5 PSI. Stop when until you can sustain 5 PSI or if you get a steady flow of air out of the faucet.
If the tank has a drain valve at the bottom, you can use that instead of a faucet to get the water out. If the tank has a drain valve at the bottom, just holding the air valve open will allow the water to come out without the need to pump air in.
Last edited by AllanJ; August 28th, 2011 at 12:23 AM.
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