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Pipe Table 3: (Metric) Required Flow Rates to Achieve 0.6 m/sec ( 2 ft/sec ) - SDR 11 Pipe*
 
Nominal 
Diameter 
( in. (mm) )
SDR 11
Flow Rate
( l/min )
SCH 40
FlowRate
(gpm)
SDR 17, IPS
Flow Rate
(gpm)
SDR-13.5
Flow Rate
(gpm)
3/4  ( 20 mm )
15.1
12.5
--
--
1 ( 20 mm )
22.7
20.4
--
17.0
1 1/4  ( 32 mm )
34.1
35.2
--
25.4
1 1/2  ( 37.5 mm )
45.4
48.1
52.2
35.6
2  (50 mm )
68.1
79.1
81.4
60.9
3  ( 75 mm )
151.4
--
--
--
  
* Adapted from Closed-Loop/Ground-Source Heat Pump Systems Installation Guide.  NRECA Research Project 86-1.  Oklahoma State University.  1988.

 

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