Water Pressure Tank Sizing Chart

Properly sizing a water pressure tank ensures that the run time on the water pump is kept at a minimum.

Water pressure tank sizing chart. You will want to choose a tank with the lowest volume capacity that is greater than or equal to the total required volume. Water pressure tanks store water that s pumped from a well and dispense water under pressure when you use faucets and other fixtures. Sizing a water pressure tank properly keeps the amount of run time to the water pump held to a minimum. See example below with this information in hand you can refer to the flexcon sizing charts below to select the proper tank for your application.

A properly sized pressure tank ensures your household water needs are met and your pump is protected against short cycling. With the water pump off the pressure in the tank will remain at 60psi until more water in the house is used draining the tank once again. There are no disadvantages to having a larger well tank. Once the pressure in the tank meets the 60 psi threshold pump cut out pressure the pressure switch will signal the water pump to stop pumping ceasing the influx of water into the tank.

A 20 gpm pump needs a tank with 20 to 40 gallons of storage. Old pressure tank sizing method in the past pressure tanks were sized to store at least 1 or 2 gallons of water for every gallon per minute the pump can produce. Join john woodard our master water specialist. Almost 2 3s or more of a tanks.

A 10 gpm pump needed a pressure tank that holds 10 or 20 gallons. The amount of water stored in a vessel between high and low pressures is commonly called drawdown and the high and low pressures are dictated by the size of the tank s air cushion. It s important that the size of a tank is adequate for your. Larger tank sizes will reduce pump cycles extending pump life and saving electricity.

This should not be confused with tank volume for example a pre charged tank with a tank volume of 20 gallons has only five to seven gallons drawdown capacity depending on the cut in cut out on. The calculation to determine stored water requirement drawdown is. The figure that is calculated on line 7 is the total tank volume required based on the given design criteria. An under sized pressure tank can cause a water pump to run an excessively.

Pressurized well tanks extend the lifespan of your well pump by preventing rapid on off cycling of the pump and maintaining water pressure throughout your home. Tank drawdown capacity is the minimum amount of water stored and or delivered by the pressure tank between pump shut off and pump re start. To select the minimum size tank count the fixtures inside and outside your home including showers appliances toilets etc and refer to the chart below. The more a pump must run the more wear and tear occurs to the pumping mechanism and the electric motor.