Transcription of Flow is measured in GPM PSI FPS - The Urban Farmer Store
1 PIPE SIZING CHARTP ipes in an irrigation system should be sized so that they allow water to flow through is measured in GPM ( gallons per minute ), friction loss is mesured in PSI (pounds per squareinch), and velocity is measured in FPS (feet per second). There are two goals:1) To ideally have the same pressure at each sprinkler in a zone, and2) To have low water velocity which reduces the chance of water hammer (the violent move-ment of water through pipes).There are numerous charts that assist in making these calculations. However, in residential andsmall commercial applications, a simple chart listing the maximum flow that a size and type of pipewill carry will suffice. The chart below takes both into ** Flow Rates ( gallons per minute )Pipe Type1/2 3/4 1 1 1/4 1 1/2 2 SCHEDULE 404813223050 SCHEDULE 803611202646 CLASS 200NA1016263655 TYPE L (DRIP)*4 gpm8 gpm13 gpmNANANA240 gph480 gph780 gph* 1/8 10 , 1/4 20 , 3/8 100 The flow of drip tubing is generallyexpressed in GPH (gallons per hour).
2 To convert GPM to GPH, simply multiply GPM by 60. (GPM X 60=GPH)** These flow rates are the maximum before water hammer becomes apparent. That means you can, ifyou choose, get more water through the pipes than shown, but you can loose pressure and cause vibrationin the lines, if you do.
