Flush valves will open every time the system shuts off, draining water trapped in the line. If you have a long irrigation pipe in your back yard, then it may be very annoying when it starts to become clogged. A garden sprinkler system makes maintaining a yard much easier, but you do have to take care to drain them of any remaining water come late fall if you live in an area with cold winters. Within your sprinkler system, there are a set of valves that controls each sprinkler line. Locate the Origin of the Line. Any segment of pipe less than 300 feet will be flushed for a minimum of 1 minute. In order to correct this problem, you will need to unclog the pipe using natural agents. Make sure to have a bucket available for water drainage. Once the required flushing duration is achieved, we verify that the water stream is clear. We would flush 2,500 feet of pipe for a minimum of 9 minutes. If you have a more elaborate irrigation system, find a suitable blow-out point such as ⦠During our flushing procedures we add a safety factor of 2. When you blow the system out, the heads should stay UP for the entire 5 min. Keep your system clean and clear of clogs by flushing it with water at least 3 times a season. How to Flush Out a Drip Irrigation System. Look for the screws holding them in place and unscrew them with a screwdriver. Flush all the water from the system to avoid damaging pipes and fixtures. I am replacing my valves and want a clean start. Ordinary wear and tear or contaminated water can potentially block the nozzles. The next action is to flush the pipes to find, identify, and clear foreign materials. Otherwise, debris will breach the system and block the nozzles. If your irrigation lines start at a sillcock (spigot), the hose end that screws onto the sillcock is an excellent point. If too much water remains in your sprinkler lines, then that water will freeze, and the resulting expansion can break the plastic lines laid below the ground. That compressor cannot produce enough air to properly flush the lines. Should I do each head or just the furthest one. Then, turn on the water to force it through the line to clear it. Draining a little water may not be enough to prevent pipe rupture. Make sure you flush the initial point of the system to avoid clogging. I have seven zones on a deep well. Make sure you flush the system at the beginning of the season. Emitters can also be installed at low points to assist with draining. If they sink back down, you don't have enough volume available to hold them up. The air should flush out of the system within a few minutes. Blowing out the Lines. Turn off your water at the dedicated Sprinkler Line Shutoff (A) in your basement / crawlspace. You are not doing a proper blow out. Those valves are typically housed in a plastic box below ground, typically identified by a round green plastic top. Open the 2 Petcockâs (F) with a flat head screwdriver so that the screw head runs a 45 degree angle; Open the Inside Drain (B) to drain your system. Flush Valves can be installed at low points in the line to assist with draining the system. Another common method is to blow out the lines using compressed air. Flush the Sprinkler System. Protocols that describe specific steps for pre-testing wet and dry sprinkler systems before flushing begin with an inspection of the exterior system parts: the pipe, hangers, and sprinkler heads. What is the best way to flush out a sprinkler system. Thanks for any input. Since water expands as it freezes, draining the system before cold weather strikes ensures that the pipes won't burst. To move a sprinkler system line, we must first locate its origin. 2. You didn't specify that the pressure in the line should NEVER exceed 50psi. 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