Potable Water Expansion Tank Pressure Setting

When water is heated in a closed vessel or system pressure builds.

Potable water expansion tank pressure setting. But there are some circumstances in which an adjustment to the pre charge may be needed. The air pressure in the tank increases and so does the water pressure in the system. However if the tank is properly sized the increase in system pressure is not enough to cause the pressure relief valve to open even when all the water in the system reaches its maximum temperature. Heating boiler bladder type expansion tank compression tank pressure adjustment.

If youre considering converting an old non captive type expansion tank to a captive air expansion tank an easy rule of thumb is to replace the existing tank with the model that is equal to the existing tanks volume. Bleed air pressure out of the water tank or add air pressure into the water tank until the tank pressure is at the desired set pressure. Enter the appropriate information in the boxes below. Water heater gallons.

When water is heated it expands due to a phenomenon known as thermal expansion. When the pre charge was not to factory specifications when the air pre charge pressure needs to be increased to. Diaphragm expansion tanks can be sized using charts or software. Use a tire gauge to check the pressure.

For example if a 15 gal. Supply pressure the set pressure of the water pressure reducing valve or maximum system pressure. For example if your well pump pressure control switch is set to cut in start pumping water from the well at 30 psi then set the pressure tank to 30 2 28 psi. At the time that you do this you must install an auto vent to get rid of the.

When in doubt replace both the t p valve and the expansion tank. If the pressure of the house is below 60 psi and the expansion tank is set up properly and is the correct size then replace the t p valve. Expansion tanks are designed to safely absorb the excess water created and prevent relief valves from triggering. Start by removing the protective cover from the air valve on the tank.

Check the size of the expansion tank. The expansion tank goes on the cold inlet side between the water shut off valve and the tank. To properly size a watts regulator series plt or deta potable water expansion tank. Air pre charge 40psi air charge is standard.

We offer a range of expansion tanks for potable and non potable applications. For most installations the factory set air pre charge in an expansion tank is correct and should be left alone. Most expansion tanks come pressurized to 12 40 psi but before you install the tank you have to match the system pressure. If the t p valve is discharging check the water pressure of the house and the expansion tank pressure.

Tank is hanging from the ceiling replace it with a no.