EQUIVALENT FEET OF PIPE FOR PEX FITTINGS (brass fittings)
Nominal pipe size, inches
1/2
3/4
1
1 1/4
1 1/2
2
90 Degree Elbow
3.0 1.0 2.0 1.0
2.2 0.3 0.8 0.3
3.4 0.2 2.0 0.2
9.6 1.5 8.8 1.6
10.9
11.3
Coupling
2.7
1.4
Tee-Branch Flow
11.6
12.1
Tee-Line Flow
2.1
1.6
(EP fittings)
90 Degree Elbow
3.7 1.0 1.0 2.3
2.3 0.2 0.2 0.8
4.6 0.2 0.2 2.0
10.0
11.5
- - -
Coupling
-
-
Tee-Branch Flow
3.8 8.6
1.8
Tee-Line Flow
10.6
FLOW AND HEAT CAPACITY @ 4' OF HEAD LOSS PER 100' OF PIPE LENGTH
SIZE
INSIDE DIA.
FLOW, gpm
BTU/HR 10°F Δ T
BTU/HR 20°F Δ T
BTU/HR 30°F Δ T
Oxygen Barriered PEX Tubing
5/8” 3/4"
0.574” 0 .678” 0 .875” 1.280" 1.600" 2.030"
2.5
12,500 15,000 27,500 75,000 135,000 260,000
25,000 30,000 55,000 150,000 270,000 520,000
37,500 45,000 82,500 225,000 405,000 780,000
3
1"
5.5
1 1/4" 1 1/2"
15 27 52
2"
Type L Rigid Copper Tube - max. vel = 6'/sec for noise; max. vel = 10'/sec for erosion
3/4"
0.785" 1.025" 1.265" 1.505" 1.985"
3.5 6.5
17,500 32,500 60,000 90,000 195,000
35,000 65,000 120,000 180,000 390,000
52,000 97,000 180,000 270,000 585,000
1"
1 1/4" 1 1/2"
12 18 39
2"
Schedule 40 Black Steel Pipe
3/4"
0.824" 1.049" 1.380" 1.610" 2.067"
4.2
21,000 40,000 85,000 125,000 240,000
42,000 80,000 170,000 250,000 480,000
63,000 120,000 255,000 375,000 720,000
1"
8
1 1/4" 1 1/2"
17 25 48
2"
13
Hydronic System Design Manual ©DECTRA CORPORATION - March 2013
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