User Guide

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Table E-1: PEX pipe expansion arm calculations ½" to 3"
2" 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).
90
50 0.36 10.50 2.10 4.20
60 0.432 11.50 2.30 4.60
70 0.504 12.42 2.48 4.97
80 0.576 13.28 2.66 5.31
90 0.648 14.08 2.82 5.63
100 0.72 14.84 2.97 5.94
100
50 0.4 11.06 2.21 4.43
60 0.48 12.12 2.42 4.85
70 0.56 13.09 2.62 5.24
80 0.64 13.99 2.80 5.60
90 0.72 14.84 2.97 5.94
100 0.8 15.65 3.13 6.26
110
50 0.44 11.60 2.32 4.64
60 0.528 12.71 2.54 5.08
70 0.616 13.73 2.75 5.49
80 0.704 14.68 2.94 5.87
90 0.792 15.57 3.11 6.23
100 0.88 16.41 3.28 6.56
120
50 0.48 12.12 2.42 4.85
60 0.576 13.28 2.66 5.31
70 0.672 14.34 2.87 5.74
80 0.768 15.33 3.07 6.13
90 0.864 16.26 3.25 6.50
100 0.96 17.14 3.43 6.86
130
50 0.52 12.61 2.52 5.05
60 0.624 13.82 2.76 5.53
70 0.728 14.93 2.99 5.97
80 0.832 15.96 3.19 6.38
90 0.936 16.92 3.38 6.77
100 1.04 17.84 3.57 7.14
140
50 0.56 13.09 2.62 5.24
60 0.672 14.34 2.87 5.74
70 0.784 15.49 3.10 6.20
80 0.896 16.56 3.31 6.62
90 1.008 17.56 3.51 7.03
100 1.12 18.51 3.70 7.41
150
50 0.6 13.55 2.71 5.42
60 0.72 14.84 2.97 5.94
70 0.84 16.03 3.21 6.41
80 0.96 17.14 3.43 6.86
90 1.08 18.18 3.64 7.27
100 1.2 19.16 3.83 7.66
2" PEX pipe expansion arm
Delta
T (ΔT)
Run
(ft)
Delta L
(in)
Flexible arm
length (in)
L1
(in)
L2
(in)
160
50 0.64 13.99 2.80 5.60
60 0.768 15.33 3.07 6.13
70 0.896 16.56 3.31 6.62
80 1.024 17.70 3.54 7.08
90 1.152 18.78 3.76 7.51
100 1.28 19.79 3.96 7.92
2½" 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 3.89 0.78 1.56
60 0.048 4.26 0.85 1.70
70 0.056 4.60 0.92 1.84
80 0.064 4.92 0.98 1.97
90 0.072 5.22 1.04 2.09
100 0.08 5.50 1.10 2.20
20
50 0.08 5.50 1.10 2.20
60 0.096 6.02 1.20 2.41
70 0.112 6.51 1.30 2.60
80 0.128 6.96 1.39 2.78
90 0.144 7.38 1.48 2.95
100 0.16 7.78 1.56 3.11
30
50 0.12 6.73 1.35 2.69
60 0.144 7.38 1.48 2.95
70 0.168 7.97 1.59 3.19
80 0.192 8.52 1.70 3.41
90 0.216 9.04 1.81 3.61
100 0.24 9.52 1.90 3.81
40
50 0.16 7.78 1.56 3.11
60 0.192 8.52 1.70 3.41
70 0.224 9.20 1.84 3.68
80 0.256 9.84 1.97 3.93
90 0.288 10.43 2.09 4.17
100 0.32 11.00 2.20 4.40
50
50 0.2 8.69 1.74 3.48
60 0.24 9.52 1.90 3.81
70 0.28 10.29 2.06 4.12
80 0.32 11.00 2.20 4.40
90 0.36 11.67 2.33 4.67
100 0.4 12.30 2.46 4.92