(D) Enter your elevation head on your Design Data Form. You may need to make several stepped measurements, or you may prefer to just make an educated guess at the elevation difference rather than try to measure it. If it is too low, you may have problems with your sprinkler design. For sprinkler systems with large radius sprinklers (over 35′ between sprinkler heads) you will need a higher Design Pressure. Sit back. Without the tank, pressure will build throughout the home plumbing system until a fixture is used, potentially leading to damage. If not, the pipe from your well may be too small. As a side note keep in mind that higher Design Pressures result in lower flows, so the higher the pressure, the more valves you will need. Other models do not have a keyboard and must be hooked up to a programming device (often a laptop, tablet, or smartphone) to change the settings. You are going to need about 20 GPM of water to irrigate 1 acre of grass with sprinklers. 8. Don’t worry about valve zones now, we’ll have more on that later. The bottom line here is to keep the pump as close to the water as possible. Guess what? They are also sold on a number of web sites and, of course, Ebay. Dynamic Water Depth is measured in well with the pump running. Reopen the ball valve and wait for the pump to start again. For most situations I recommend that you use a Design Pressure of 50 PSI. 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. ). A wide variety of 200 psi water pump options are available to you, such as electric, pneumatic. (As the flow from the pump is reduced the pump produces more pressure.) Several retail hardware store chains sell what they call “sprinkler pumps”. What gives? 6. Well, even if you don’t get it, that’s O.K. Keep your pressure below this level, it is not good for the pump to restrict the flow too much. 4. Even most City parks now keep the spacing between sprinklers at 55 feet or less. I’ll say it again because it’s important: don’t rely on these numbers! Pressure Up, Flow Down?!!! C $113.73. Pumps are made to push water, not to pull it. Read this! Multiply the pump Horsepower times 2178 (a constant value, see note at bottom of this page) and then divide by the Total Pressure Head in feet. One acre is equal to 43,560 square feet (or 4047 square meters.) As you close the valve the pressure climbs. The problem is that often the existing pipe is not large enough. www.watertechonline.com is using a security service for protection against online attacks. There is a lot you need to know. in the Irrigation Pumping Systems Tutorial. That is, how much higher (or lower) is the highest point in the irrigated area than the top of the well. Same deal. For example, if you want to put the heads 50 feet apart, you will need a design pressure of 65 PSI (50 + 15 = 65.) Yet another Example: 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. (F) Multiply your Design Pressure by 2.31 and enter it as “Design Head” on your Design Data Form. This creates a problem if you want to get 50 PSI and the pump turns off at 45 PSI! To convert PSI to feet of head we simply multiply PSI times 2.31. Often these two performance figures are both the maximums possible for the pump, which may be accurate, but is also misleading. If not, you are going to be in big trouble. To reduce high pressure in a home, you'll need a Pressure Reducing Valve (PRV). Another option is to plant shrubs and use drip irrigation on them. That just doesn’t make sense. Please enable cookies on your browser and try again. 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. 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. C $133.56. Try working the examples, it helps the old brain to kick in! Water PSI abbreviation meaning defined here. It gets very tricky. Shop a huge online selection at eBay.com. Example: 55 PSI design pressure and 35 GPM Design Flow require a 2″ pipe (one size larger than chart says because design pressure is over 50 PSI). Shut the water valve off and pay attention to the pressure gauge to note the … "Lazy hand" gauges feature an additional high-level indicator, which remains stuck at the highest pressure experienced until the gauge is reset. You can tap it between the pump and pressure tank as shown, or after the pressure tank. All the pipes and the valve should be the same size as the pipe you cut to make the tap. In fact, these are often required by code for pressures beyond 80 psi. As you can see from the diagram above, the Dynamic Water Depth is the distance in feet between the top of the well and the water level in the well when the pump is running (dynamic means moving, as in the water is moving when the depth is measured.) Submersible Pumps. Differential pressure. C $17.38. I strongly suggest the Pump Tutorial if you would like to know more about your pump system, or if you want to know more of the reasoning behind what follows on this page. Remember we are measuring your AVAILABLE pressure and flow, based on the current conditions at your house (or whatever). Total Pressure Head = 30 + 10 + 115 = 155 ft. hd. The more water is moved, the more of the existing pressure is consumed moving it. Write down the pressure gauge reading on the line “Design Pressure (PSI)” on your Design Data form. 45 PSI Design Pressure (104 feet head). You’re thinking if more pressure is added then more water will be moved, which is true, but you’re talking about ADDING pressure, not using the AVAILABLE pressure! So, it turns out that back in 1965, the pump sales rep was trying to show me the correct pump for my application. I suggest you read through both of the methods, and try both of them if possible. See the pump and pressure tank example diagrams above. Example: If you mess this up you can ruin your pump! It is important that the pump be running when this is measured. PSI is a wholesale distributor of quality pump and water treatment goods and components for Western Canada. Shop great deals on Generac Pressure Washer Water Pumps. Water levels often drop over time. To make matters worse, most people measure the flow from a standard faucet. If you have a submersible pump it will be even harder to hear. If you designed your sprinkler system for the old pump then it will not work well with the new one, and may even damage the new pump! Another Example: If you have shrubs, they typically only use 1/2 as much water as grass, so 20 GPM would water 2 acres of shrubs. Below, we'll take a look at how water pressure is generated, and why it matters. Total Pressure Head = 8 – 25 + 150 = 133 ft. hd. If you had a city water supply we would measure the “Static Water Pressure”.