After 200 feet of 34 hose the pressure is about 40 psi. When properly done the blow out method forces all of the water out of the sprinkler system so there is no chance of freeze damage throughout the winter months.
How To Blow Out Sprinkler Lines Using A Compressor
Also to know is what size air compressor do I need to blow out water lines.
Psi to blow out sprinkler system. At over 80 psi the sealing gasket on the rainbird maxi-paws will be ruined. Larger lines such as pipes that are 34- to 1. Once the system timer opens that zone then you should see the sprinkler heads in that zone pop up and begin spraying out the remaining water inside the system.
The blow out method involves placing a small amount of pressure behind the sprinkler system using a commercial air compressor at only 55-65 psi delivering 185 CFM. To properly blow out a sprinkler system your air compressor needs to provide at least 20 cubic feet per minute. The minimum volume an air compressor must be able to provide to properly blowout an irrigation system is 20 cubic feet per meter CFM.
When the water turns from mist to air its time to move onto the next zone. A pressure-regulating valve must be used to avoid over pressurization of the system. Additionally dont mistake air pressure and water pressure.
Watch the water sprinkling from the system. When you are done position ball valves into partially opened positions. You can also use a garden hose for this job.
If they sink back down you dont have enough volume available to hold them up. Air has a lower viscosity than water and creates higher stresses that can damage sensitive sprinkler equipment. Most irrigation professionals recommend using at least 50 cubic feet per minute.
Step 2 - Release Pressure in the Line. When you blow the system out the heads should stay UP for the entire 5 min. That compressor cannot produce enough air to properly flush the lines.
Open the hose bib at the sprinklers mainline to release pressure on the pipes and allow any water to drain. As you can see blowing out your own sprinkler system isnt as simple as. Turn on the compressor and follow the manufacturers directions for settingcharging the air compressors psi.
The homeowner will only discover the next spring the sprinklers wont turn just one way and with the rotors the air will turn them so fast it will destroy the gears. Although you can blow out your sprinkler system without an outlet drain pipe it isnt recommended because blowing air through the petcocks can heat your system and severely damage small plastic parts within the system. Similarly can a pancake compressor blow out sprinklers.
You didnt specify that the pressure in the line should NEVER exceed 50psi. Just because your system says it operates at 120 PSI of water pressure does not mean you can use up to 120 PSI of air pressure to blow it out. Ewing Irrigations Jeffrey Knight with the help of.
The blow out technique involves inserting a tiny low quantity of pressure behind the system employing an industrial compressor at solely 55-65 psi however that delivers 185 CFM. Air volume should be high and air pressure low. How do you blow out sprinklers with air compressor.
Then turn off the water supply and set the sprinkler system timer to open just one zone. Properly winterizing your irrigation system is essential to preventing damaged pipe and back-flow devices. Connect your air compressor to the blow out line connected to that zone and charge up your air tank.
Too much pressure will cause injury to the valves or piping and employ a little look compressor can lead to it not having enough free air to properly ready the. Repeat the process in other sections if this applies to your specific system. Still many professionals recommend up to 50 CFM at under 50 PSI for optimal performance assuming the water lines are less than an inch in diameter.
Step 3 - Prep Compressor. Connect the other end of the air hose to the. Do not stand over any irrigation components pipes sprinklers and valves during air blow out.
Air pressure must not exceed 50 pounds per square inch psi during the blow out procedure. Use the compressor to blow out excess water from a given section of your sprinkler system. Then turn off the water supply and set the system timer to open just one zone.
The isolation ball valve downstream of the backflow prevention device has to be closed. Keep the sprinkler on for approximately two minutes in each zone. Set the compressor air pressure regulator to a maximum of 80 psi for rigid PVC pipe systems or 50 psi for flexible black polyethylene pipe.
Next open the manual drain valve at the end of that zone if equipped. Once you have finished with the zone nearest you you have blown out. You are not doing a proper blow out.
To properly blow out a sprinkler system your air compressor needs to provide at least 20 cubic feet per minute. Set the compressor air pressure regulator to a maximum of 80 psi for rigid PVC pipe systems or 50 psi for flexible black polyethylene pipe. Most irrigation professionals recommend using at least 50 cubic feet per minute.
Most air compressors will list their cubic feet per minute rating on the side of the tank. If your system doesnt have an outlet drain pipe you will have to install one. Next open the manual drain valve at the end of that zone if equipped.
Then connect the air line to the blow-out port as shown. Air pressure must not exceed 50 pounds per square inch psi. When blowing out the system to avoid excessive pressure which can damage valves or sprinkler pipe or cause physical injury due to flying debris.
This combination of high volume and low pressure will minimize the damage that can occur during the winterization process.
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