User Guide

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Table E-1: PEX pipe expansion arm calculations ½" to 3"
1½" PEX pipe expansion arm
Delta
T (ΔT)
Run
(ft)
Delta L
(in)
Flexible arm
length (in)
L1
(in)
L2
(in)
PEX with PEX-a Pipe Support, strut and strut clamps has a thermal expansion rate of 0.08"/10°F ΔT/100 ft. (2.03mm/5.56°C ΔT/30.48m).
10
50 0.04 3.06 0.61 1.22
60 0.048 3.35 0.67 1.34
70 0.056 3.62 0.72 1.45
80 0.064 3.87 0.77 1.55
90 0.072 4.10 0.82 1.64
100 0.08 4.33 0.87 1.73
20
50 0.08 4.33 0.87 1.73
60 0.096 4.74 0.95 1.90
70 0.112 5.12 1.02 2.05
80 0.128 5.47 1.09 2.19
90 0.144 5.80 1.16 2.32
100 0.16 6.12 1.22 2.45
30
50 0.12 5.30 1.06 2.12
60 0.144 5.80 1.16 2.32
70 0.168 6.27 1.25 2.51
80 0.192 6.70 1.34 2.68
90 0.216 7.11 1.42 2.84
100 0.24 7.49 1.50 3.00
40
50 0.16 6.12 1.22 2.45
60 0.192 6.70 1.34 2.68
70 0.224 7.24 1.45 2.90
80 0.256 7.74 1.55 3.10
90 0.288 8.21 1.64 3.28
100 0.32 8.65 1.73 3.46
1½" PEX pipe expansion arm
Delta
T (ΔT)
Run
(ft)
Delta L
(in)
Flexible arm
length (in)
L1
(in)
L2
(in)
PEX with PEX-a Pipe Support, strut and strut clamps has a thermal expansion rate of 0.08"/10°F ΔT/100 ft. (2.03mm/5.56°C ΔT/30.48m).
50
50 0.2 6.84 1.37 2.74
60 0.24 7.49 1.50 3.00
70 0.28 8.09 1.62 3.24
80 0.32 8.65 1.73 3.46
90 0.36 9.18 1.84 3.67
100 0.4 9.67 1.93 3.87
60
50 0.24 7.49 1.50 3.00
60 0.288 8.21 1.64 3.28
70 0.336 8.87 1.77 3.55
80 0.384 9.48 1.90 3.79
90 0.432 10.05 2.01 4.02
100 0.48 10.60 2.12 4.24
70
50 0.28 8.09 1.62 3.24
60 0.336 8.87 1.77 3.55
70 0.392 9.58 1.92 3.83
80 0.448 10.24 2.05 4.10
90 0.504 10.86 2.17 4.34
100 0.56 11.45 2.29 4.58
80
50 0.32 8.65 1.73 3.46
60 0.384 9.48 1.90 3.79
70 0.448 10.24 2.05 4.10
80 0.512 10.95 2.19 4.38
90 0.576 11.61 2.32 4.64
100 0.64 12.24 2.45 4.90
90
50 0.36 9.18 1.84 3.67
60 0.432 10.05 2.01 4.02
70 0.504 10.86 2.17 4.34
80 0.576 11.61 2.32 4.64
90 0.648 12.31 2.46 4.93
100 0.72 12.98 2.60 5.19
100
50 0.4 9.67 1.93 3.87
60 0.48 10.60 2.12 4.24
70 0.56 11.45 2.29 4.58
80 0.64 12.24 2.45 4.90
90 0.72 12.98 2.60 5.19
100 0.8 13.68 2.74 5.47
110
50 0.44 10.15 2.03 4.06
60 0.528 11.12 2.22 4.45
70 0.616 12.01 2.40 4.80
80 0.704 12.83 2.57 5.13
90 0.792 13.61 2.72 5.45
100 0.88 14.35 2.87 5.74
1¼" PEX pipe expansion arm
Delta
T (ΔT)
Run
(ft)
Delta L
(in)
Flexible arm
length (in)
L1
(in)
L2
(in)
PEX with PEX-a Pipe Support, strut and strut clamps
150
50 0.6 10.90 2.18 4.36
60 0.72 11.94 2.39 4.78
70 0.84 12.90 2.58 5.16
80 0.96 13.79 2.76 5.51
90 1.08 14.62 2.92 5.85
100 1.2 15.41 3.08 6.17
160
50 0.64 11.26 2.25 4.50
60 0.768 12.33 2.47 4.93
70 0.896 13.32 2.66 5.33
80 1.024 14.24 2.85 5.70
90 1.152 15.10 3.02 6.04
100 1.28 15.92 3.18 6.37