Having fewer pump cycles increases tank longevity. In fact, bigger is better when it comes to well pressure tanks because they wear out more slowly with fewer startups and longer run times. A larger tank would have longer and slower cycles, but the runtime would be the same. You can’t have a well pressure tank that’s too big. In the above scenario, you would need to use a well-pressure tank with a 22.5-gallon or more drawdown capacity, which would be an 85-gallon pressure tank (more about that later). Here’s an example of how these calculations might look:ġ5 GMP pump flow rate x 1.5 GPM minimum run time = 22.5-gallon drawdown capacity Once you know the pump flow rate and minimum run time, you can use the following equation to determine how much drawdown you need in your pressure tank:ĭrawdown capacity = Pump flow rate x Minimum run time 20+ GMP pump flow rate: 2.0 GPM of run time.10 to 20 GPM pump flow rate: 1.5 GPM of run time.0 to 10 GPM pump flow rate: 1.0 GPM of run time.When sizing a pressure tank and determining the drawdown capacity you need, you can use these guidelines: Most well pressure tanks come with a chart to tell you the drawdown capacity based on your pressure switch settings. The first number is the lowest pressure (at which the tank turns on), and the last is number is the highest pressure (at which the tank turns off). There are three pressure switch settings for pressure tanks: 20/40, 30/50, and 40/60. The pressure switch setting can change the tank drawdown. Pressure switch setting: The pressure switch setting is the pressure at which the pump turns on and shuts off.Minimum run time: How long will your pump run?.Flow rate: What is your pump flow rate in gallons per minute (GPM)? The flow rate is usually initially tested when you drill a new well.Size matters when it comes to well pressure tanks, so you’ll need to know a few things before you choose one: Knowing the drawdown will help you determine your tank size. Well-X-Trol – the world’s most trusted brand of well tanks setting the standard for quality, reliability and performance.When you know the flow rate, minimum run time, and pressure switch setting, you can determine the drawdown. Now Well-X-Trol is combining its patent-pending Turbulator™ with an antimicrobial liner to deliver Clean Water Technology™ in every tank. Backed by an industry leading 7 year warranty. ![]() This tradition of innovation continued with Amtrol’s Next Generation Well-X-Trol, which utilized high strength steel to deliver 150 psig working pressure – 20% higher than competitve well tanks. This revolutionary product featured an innovative design using a hoop ring and groove to lock the diaphragm, liner and shell together in a totally unique way. invented the first pre-pressurized well tank over 50 years ago. ![]() Situations where high sulfur content is presentĮnvironments where methane or other well gases are presentĪmtrol Inc.
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