Irrigation Shut Down $40.00
Every year, before the first freeze, the ritual of irrigation "blow out" becomes the priority for all irrigation systems that are in parts the country where the frost level extends below the depth of the installed piping.
Even if you have drained some water out of the system, the remaining water can freeze, expand and crack the PVC piping (rigid, white pipe), usually from fitting to fitting. Polyethylene pipe (flexible, black pipe) is used in many freezing climates. Although polyethylene pipe is more flexible and can expand under pressure, water left inside could freeze and rupture the pipe walls. Freezing water in the backflow assembly will damage the internal components and could possibly crack the brass body.
"Blow Out" Method
The blow out method utilizes an air compressor with a Cubic Foot per Minute (CFM) rating of 125-185 for any mainline of 2" or less and a PSI of 50-80. The compressor is attached to the mainline via a quick coupler, hose bib or other type connection, which is located before the backflow device. To start the "blow out", open the Test Cocks on the vacuum breaker, shut off the irrigation water supply and open the drain on the supply line. Once the line is drained, close the drain and proceed to connect the air line. With the compressor valve in the closed position, attach the air compressor hose to the fitting. Activate the station on the controller that is the zone or sprinklers highest in elevation and the furthest from the compressor. Do not Close the backflow isolation or Test Cock valves. Slowly open the valve on the compressor; this should gradually introduce air into the irrigation system. The air pressure should be constant at 50 PSI. If the sprinkler heads do not pop up and seal, increase the air until the heads do pop up and seal.
Please Call Jason at (804) 641-9602 to schedule
40.00 Per house
Licensed & Insured Contractor.
Posting ID: 4125452754