Redesign it if you have to. Do not turn off the pump or adjust the ball valve from now until you finish the rest of the steps! I also suggest using a brass (or bronze) ball valve. 65 PSI Design Pressure needed for large turf sprinklers, which equals 150 feet of design pressure head (65 * 2.31 = 150 ft hd). ( If your pump is manually controlled you will have to manually start it.)
Most do-it-yourself sprinkler design tutorials are not suitable for rural irrigation systems that use pumps!!! Think of water pressure as the “energy” that moves the water.
You may be able to find instructions for the pressure switch online by searching for the manufacturer’s website.
You’re done measuring. If your design pressure is over 50 PSI use one size larger pipe than what is shown. A large number of questions I get from people who are confused are caused because they are trying to mix together this tutorial with some other guide or tutorial, or maybe it was advice they got from some well-meaning, but clueless, salesman. Please, please, please! They will install a temporary pump in the well to test the output. I strongly suggest using metal pipe and fittings between the tap and the ball valve. At your tap location, cut a short section out of the pipe out and install the compression tee. First, if you have a well, you will need to know the GPM of the well itself.
The higher your elevation is above sea level, the closer the pump needs to be to the water level. As the flow (GPM) of the water increases, the pressure (PSI) of the water must decrease! The Design Pressure is the amount of water pressure that is needed at the inlet of the irrigation system in order for the system to operate.
Horsepower x 2178 / Total Pressure Head (feet) = GPM (the “Design Flow”). Long intake pipes/manifolds can also hurt the pump performance.
If you have a well, you have probably been told at some time or another that you have a “XX GPM well”. Free shipping.
If your calculations say you will likely need a 1.5 HP pump, and you find a 1/2 HP pump at the store that says it will do the job, be very suspicious. Prime members enjoy FREE Delivery and exclusive access to music, movies, TV shows, original audio series, and Kindle books. What if you don’t have a well? The service requires full cookie support in order to view this website. For a pumped system the amount of water available is determined by the size of the pump. At least one of them even calls their pump a “High Pressure Sprinkler Pump.” Sorry, but not by any stretch of the imagination!
The last pipe section going to the bucket after the ball valve is temporary and can be plastic. (G) Calculate your “Total Pressure Head” and enter it on your Design Data Form. The 8″ straight lengths of pipe before and after the pressure gauge are important, they must be 8″ long and there can’t be any ells in these sections. Better to sound the well now. Guess what?
By continuing you agree to the use of these cookies or other local storage, as well as the collection, sharing, and use of personal data for personalization of ads or other services. It’s not that they want to lie to you, it’s just that there are several terms here that can be easily confused. Often the figure they give you on the box is the maximum possible for each value. Sorry this is such a long page, but pumps are tricky.
Later you can use this new pipe for the supply pipe (mainline) for your sprinkler system supply tap, so installing this isn’t a waste of money. I know this sounds like a lot of extra effort, but the result will be an almost perfectly matched pump and sprinkler system. Even many professional irrigation contractors do not understand the hydraulics of systems using pumps! If the pump is mounted above the water level (non-submersible), then you will need to substitute the actual pump location for “top of well” in this tutorial. I can’t tell you much more than that since the location of the screw will vary depending on the model. 1. Total pressure head is the “elevation head” plus the “design pressure head”, all in feet of head. (E) Enter your desired “Design Pressure (PSI)” on your Design Data form. (H) Calculate your “Initial Design Flow” and enter it on your Design Data Form.
B + C = D (Dynamic Water Depth + elevation difference). Repeat this 3 times to make sure the the results are accurate (all three measurements should be about the same). Pressures above 80 psi are too high. The purpose is to avoid creating turbulence in the water that could affect the pressure gauge accuracy.
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!