User Guide

Plumbing Design Assistance Manual l Appendix E – Expansion arm and loop calculations l 135
Table E-1: PEX pipe expansion arm calculations ½" to 3"
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 has a thermal expansion rate of 0.08"/10°F ΔT/100 ft. (2.03mm/5.56°C ΔT/30.48m).
80
50 0.32 7.96 1.59 3.18
60 0.384 8.72 1.74 3.49
70 0.448 9.42 1.88 3.77
80 0.512 10.07 2.01 4.03
90 0.576 10.68 2.14 4.27
100 0.64 11.26 2.25 4.50
90
50 0.36 8.44 1.69 3.38
60 0.432 9.25 1.85 3.70
70 0.504 9.99 2.00 4.00
80 0.576 10.68 2.14 4.27
90 0.648 11.33 2.27 4.53
100 0.72 11.94 2.39 4.78
100
50 0.4 8.90 1.78 3.56
60 0.48 9.75 1.95 3.90
70 0.56 10.53 2.11 4.21
80 0.64 11.26 2.25 4.50
90 0.72 11.94 2.39 4.78
100 0.8 12.59 2.52 5.03
110
50 0.44 9.33 1.87 3.73
60 0.528 10.22 2.04 4.09
70 0.616 11.04 2.21 4.42
80 0.704 11.81 2.36 4.72
90 0.792 12.52 2.50 5.01
100 0.88 13.20 2.64 5.28
120
50 0.48 9.75 1.95 3.90
60 0.576 10.68 2.14 4.27
70 0.672 11.53 2.31 4.61
80 0.768 12.33 2.47 4.93
90 0.864 13.08 2.62 5.23
100 0.96 13.79 2.76 5.51
130
50 0.52 10.15 2.03 4.06
60 0.624 11.12 2.22 4.45
70 0.728 12.01 2.40 4.80
80 0.832 12.83 2.57 5.13
90 0.936 13.61 2.72 5.45
100 1.04 14.35 2.87 5.74
140
50 0.56 10.53 2.11 4.21
60 0.672 11.53 2.31 4.61
70 0.784 12.46 2.49 4.98
80 0.896 13.32 2.66 5.33
90 1.008 14.13 2.83 5.65
100 1.12 14.89 2.98 5.96
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 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 2.81 0.56 1.13
60 0.048 3.08 0.62 1.23
70 0.056 3.33 0.67 1.33
80 0.064 3.56 0.71 1.42
90 0.072 3.78 0.76 1.51
100 0.08 3.98 0.80 1.59
20
50 0.08 3.98 0.80 1.59
60 0.096 4.36 0.87 1.74
70 0.112 4.71 0.94 1.88
80 0.128 5.03 1.01 2.01
90 0.144 5.34 1.07 2.14
100 0.16 5.63 1.13 2.25
30
50 0.12 4.87 0.97 1.95
60 0.144 5.34 1.07 2.14
70 0.168 5.77 1.15 2.31
80 0.192 6.17 1.23 2.47
90 0.216 6.54 1.31 2.62
100 0.24 6.89 1.38 2.76
40
50 0.16 5.63 1.13 2.25
60 0.192 6.17 1.23 2.47
70 0.224 6.66 1.33 2.66
80 0.256 7.12 1.42 2.85
90 0.288 7.55 1.51 3.02
100 0.32 7.96 1.59 3.18
50
50 0.2 6.29 1.26 2.52
60 0.24 6.89 1.38 2.76
70 0.28 7.45 1.49 2.98
80 0.32 7.96 1.59 3.18
90 0.36 8.44 1.69 3.38
100 0.4 8.90 1.78 3.56
60
50 0.24 6.89 1.38 2.76
60 0.288 7.55 1.51 3.02
70 0.336 8.16 1.63 3.26
80 0.384 8.72 1.74 3.49
90 0.432 9.25 1.85 3.70
100 0.48 9.75 1.95 3.90
70
50 0.28 7.45 1.49 2.98
60 0.336 8.16 1.63 3.26
70 0.392 8.81 1.76 3.52
80 0.448 9.42 1.88 3.77
90 0.504 9.99 2.00 4.00
100 0.56 10.53 2.11 4.21