Pressure Tank Sizing Equation

Pump flow rate in gallons per minute gpm 2.

Pressure tank sizing equation.

Size the tank to a larger draw down capacity to keep the pump from running continuously if the household uses a lot of water. The pump turns on when the system reaches the low pressure cut in and off when the high pressure cut in. The goal in sizing a tank is to make sure the air side is large enough so that when the desired amount of water is put in the tank the air is not compressed to a pressure greater than system design. A pressure tank is an integral part of maintaining your well.

P pump power kw. It s important that the size of a tank is adequate for your. Sizing the water pressure tanks. The figure that is calculated on line 7 is the total tank volume required based on the given design criteria.

Qmaximum flow rate required l min. 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. Large pressure tanks can hold in excess of 200 gallons and can weigh upwards of 1600 pounds. 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.

A properly sized pressure tank ensures your household water needs are met and your pump is protected against short cycling. A 20 gpm pump needs a tank with 20 to 40 gallons of storage. A commonly used formula to find a receiver size is. A 10 gpm pump needed a pressure tank that holds 10 or 20 gallons.

V volume of the receiver tank cu ft t time for the receiver to go from upper to lower pressure limits min c free air needed scfm pa atmosphere pressure 14 7 psia p1 maximum tank pressure psia p2 minimum tank pressure psia formula sizing. T v p1 p2 c pa. Join john woodard our master water specialist. P 1 maximum tank pressure psia p 2 minimum tank pressure psia example sizing an air receiver.

To determine the proper size of the pressure tank there are three factors to consider. The formula finds the capacity vt of an autoclave large enough to give an adequate water storage r for the booster system the useful storage depends depends on maximum flow rate required q. Cut in and cut out psi pounds per square inch of the pressure switch. 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.

Place larger tanks in areas that have a solid floor such as concrete. Desired run time of the pump 3. P2 minimum working pressure relative bar. Water pressure tanks store water that s pumped from a well and dispense water under pressure when you use faucets and other fixtures.

P1 maximum working pressure relative bar. Select a pdf help sheet from our list of tanks below for assistance in sizing your pressure vessel.