NETAFIM USA Landscape & Turf Product Catalog | 53 WATER METERS STRAIGHT PIPE INSTALLATION REQUIRED FOR WATER METERS 2” AND LARGER When water flows through a pipe, any transition through a fitting, elbow, or change in pipe size causes turbulence in the water. In order to eliminate water turbulence, some water meters require straight pipe before and after the water meter. Straight pipe installation refers to the length of straight pipe needed before (upstream of the water meter) and after (downstream of the water meter). The ¾”, 1” and 1 ½” water meters do not require straight pipe installation, but a 5 x diameter before and 2 x diameter straight pipe installation after the meter is recommended. (Diameter = Meter Size) The 2” water meter requires straight pipe installation of 10 x diameter before and 5 x diameter straight pipe installation after the meter. The 3“, 4” and 6” water meters require straight pipe installation of 5 x diameter before and 2 x diameter straight pipe installation after the meter. Continuous acting air vents are used to remove air from the system for accurate metering. Proper air vent selection and placement within the system is critical. CONFIGURING STRAIGHT PIPE INSTALLATION EXAMPLE BELOW: Water Meter: 2” Upstream: 10 x 2” diameter meter = 20” (10 x D) 20” of straight pipe upstream of the water meter Downstream: 5 x 2” diameter meter = 10” (5 x D) 10” of straight pipe downstream of the water meter Meter Length: 14” Total: 44” total installation recommended 20” Straight Pipe Upstream 14” Meter Length 10” Straight Pipe Downstream 44” Total Installation Recommended Mini Combination Air Vent 2” Diameter Pipe 2” Diameter Pipe 2” Water Meter UPSTREAM DISTANCE 2” 20“ 10” 14“ 44” 3” 15“ 6” 9“ 30” 4” 20“ 8” 10“ 38” 6” 30“ 12” 12“ 54” DOWNSTREAM DISTANCE METER LENGTH TOTAL REQUIREMENT SIZE STRAIGHT PIPE INSTALLATION REQUIREMENTS (10 x D and 5 x D - 2” Size) (5 x D and 2 x D - 3“, 4” and 6” Size)
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