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The methods they use to determine water supply are little better than taking a wild guess. And that is the key to the problem. For sprinkler systems with large radius sprinklers (over 35′ between sprinkler heads) you will need a higher Design Pressure. Make a mental note of the pressure when the pump shut off. The farther and higher the pump has to pull the water, the less efficient the pump will be. Now measure the flow coming out of the pipe without adjusting the ball valve. (E) Enter your desired “Design Pressure (PSI)” on your Design Data form. (300 / seconds to fill 5 gallon bucket = GPM) Example: 10 seconds to fill the 5 gallon bucket, therefore 300 divided by 10 seconds equals 30 GPM. If you are going to use this tutorial (and you should!) Terms of Use    If you need a pump to develop 30 psi of water pressure, then buy a pump that develops 70 feet of head. For example, if you want to put the heads 50 feet apart, you will need a design pressure of 65 PSI (50 + 15 = 65.) Then use the tape measure to measure the distance from the laser beam to the top of the well. Plus, a long intake pipe is more likely to have a leak in it, and a leak in the intake pipe can cause your pump to lose prime. Just be very careful. By using this tutorial you agree to be bound by the conditions and limitations listed on the Terms of Use page. There are only so many hours in the day to water. Best to call a pump company for help at this point as something is seriously wrong with the pumping system. Another option is to plant shrubs and use drip irrigation on them. Follow the instructions below exactly! The side outlet of the compression tee should be the same size as the pipe you are tapping into. None of that domesticated city water for you! Please enable JavaScript on your browser and try again. This is to keep the pump from cycling on and off as it tries to match the demand of your irrigation system. PSI’s expansive facility allows testing of pumps up to 300hp and we can also trim and assemble pumps for fast delivery. On the other hand, excessively high pressure can be a source of great stress and frustration. Need to know what size your pipe is? It is important that the pump be running when this is measured. When the pipe from the pump goes into the tank and then another pipe comes out and goes to the house you should make your tap after the tank as shown. Caution: When designing a sprinkler system with a pump you want to keep the actual flow of each valve zone as close to the “Design Flow” as possible without exceeding the Design Flow. 93 sold. 1,493 sold. This article is part of the Sprinkler Design Tutorial Series If you’re lucky the errors balance each other out, but most of the time that isn’t going to happen. Whereas low water pressure is more of a nuisance than a serious problem (some fixtures, like washing machines, have minimum pressure requirements), high water pressure carries with it a significantly increased risk of damage to pipes, joints, fixtures and seals - not to mention increased water waste. If you do not follow these steps exactly you will get a false reading, your sprinkler design will not work, and you probably will destroy your pump! 1 … (i.e. The low water level is 20 ft. below the high water level. This friction consumes energy (remember, pressure is energy) so the pressure drops. Assuming you have a pressure controlled pump like most are, the pump should start by itself and run continuously during this time. You are going to need about 20 GPM of water to irrigate 1 acre of grass with sprinklers. If not, you are going to be in big trouble. Ready? If you mess this up you can ruin your pump! For a small park, pumping from a canal. However, most systems are like Example #2, so you can tap into the water supply line anywhere you want. As we size a pumping system, we'll want to accomplish building pressure (PSI). There may also be a GPM & PSI noted someplace on the pump, pump panel, literature, or the box the pump came in. If not, the pipe from your well may be too small. Shop a huge online selection at eBay.com. Should you desire sprinkler heads that are farther apart than 50 feet apart you should have a professional design the system. Another Example: In areas where pressure becomes too high, pressure reducing stations transfer high-pressure water to low-pressure areas, maintaining manageable levels throughout the system. As the flow (GPM) of the water increases, the pressure (PSI) of the water must decrease! In order to tell when the pump shuts off you may need someone to help out by standing close to the pump and signaling to you. Note that the pressure tank may not be near the pump, especially in cold winter areas where the tank is often installed in the house basement. A good rule of thumb for large systems is to take the distance you would like to have between sprinkler heads in feet, and add 15 to it to get a reasonable Design Pressure. Therefore, if you have a 2 acre grass yard you will need to have 40 GPM of water available in order to water it. At least one of them even calls their pump a “High Pressure Sprinkler Pump.” Sorry, but not by any stretch of the imagination! This is the pressure sensor. 50 PSI Design Pressure, which equals 115 feet of design pressure head. So, it turns out that back in 1965, the pump sales rep was trying to show me the correct pump for my application. Note: PRVs are typically installed just after the water meter. Yet another Example: If you absolutely can’t tell if the pump is running you will need to just watch the flow and pressure. Same deal. or Best Offer. I know this sounds like a lot of extra effort, but the result will be an almost perfectly matched pump and sprinkler system. This number (in feet) is called “elevation head” and is a measure of the height the pump must push the water to get it to your irrigation system. Fortunately, the pressure at which the pump turns on and off can be adjusted. Now you need to enter the elevation difference between the top of your well and the highest point in the area to be irrigated. 4. Water PSI abbreviation meaning defined here. This creates a problem if you want to get 50 PSI and the pump turns off at 45 PSI! What you are determining is the exact point where your pump produces the highest possible combination of pressure and water flow. When a pump is operating at it’s maximum GPM, it will also be at the minimum PSI. What does PSI stand for in Water? This is a good number that works with most small to mid-size irrigation systems. You may want to try adjusting it up and down. The last pipe section going to the bucket after the ball valve is temporary and can be plastic. (rounded down from 115.5). Some wells have very little draw-down, others may have 50 feet or more of draw-down. It takes most engineering students 2-3 months of college level class work before they fully understand hydraulics, so don’t feel bad if it still doesn’t make sense. If you have a submersible pump it will be even harder to hear. (This is because the pressure is used up moving the water.) Also watch out for packaged pumps that say they are rated X GPM and X PSI on the box (insert any values for “X”.) Total pressure head is the “elevation head” plus the “design pressure head”, all in feet of head. The more water is moved, the more of the existing pressure is consumed moving it. www.watertechonline.com is using a security service for protection against online attacks. BUT…   Before we start into this I need to warn you that you must follow the instructions below exactly. I have written a complete tutorial on pumps and related equipment. That results in a higher than normal flow (lower pressure = higher flow.) Helpful Hint: Private residential wells use a pressure tank and switch to control the water pressure. Without the tank, pressure will build throughout the home plumbing system until a fixture is used, potentially leading to damage. Do NOT rely on that figure! You need to measure the Dynamic Water Depth, not just the depth of the water table. The Wet Method is more accurate (but only when done correctly.) Typical settings are 35 PSI on and 45 PSI off. Click here to go to the Pump Tutorial. You may notice a GPM and PSI stamped on the pump plate also. First check to see if there is any kind of restriction in the pipe (I’ve found rocks, toy cars, rags, rats, fish, roots, etc. Home of the revolutionary NX-Series waterblasters. Don’t be surprised if your system won’t pump 65 PSI, most residential pump systems aren’t designed to supply more than 50 PSI. B H 1 L S S p o X I n s N o 8 4 r e d. Wfco 60 Psi On Demand RV Water Pump with Strainer Model No Pds3B-130-1260E . This is a good number that works with most small to mid-size irrigation systems. (H) Calculate your “Initial Design Flow” and enter it on your Design Data Form. You’re going to need to take an educated guess at this number.

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