User Guide

Plumbing Design Assistance Manual l Appendix E – Expansion arm and loop calculations l 149
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 and clevis hangers or loops has a thermal expansion rate of 0.12/10°F ΔT/100 ft. (3.05mm/5.56°C ΔT/30.48m).
100
50 0.6 15.06 3.01 6.02
60 0.72 16.50 3.30 6.60
70 0.84 17.82 3.56 7.13
80 0.96 19.05 3.81 7.62
90 1.08 20.20 4.04 8.08
100 1.2 21.30 4.26 8.52
110
50 0.66 15.79 3.16 6.32
60 0.792 17.30 3.46 6.92
70 0.924 18.69 3.74 7.48
80 1.056 19.98 4.00 7.99
90 1.188 21.19 4.24 8.48
100 1.32 22.34 4.47 8.93
120
50 0.72 16.50 3.30 6.60
60 0.864 18.07 3.61 7.23
70 1.008 19.52 3.90 7.81
80 1.152 20.87 4.17 8.35
90 1.296 22.13 4.43 8.85
100 1.44 23.33 4.67 9.33
130
50 0.78 17.17 3.43 6.87
60 0.936 18.81 3.76 7.52
70 1.092 20.32 4.06 8.13
80 1.248 21.72 4.34 8.69
90 1.404 23.04 4.61 9.21
100 1.56 24.28 4.86 9.71
140
50 0.84 17.82 3.56 7.13
60 1.008 19.52 3.90 7.81
70 1.176 21.08 4.22 8.43
80 1.344 22.54 4.51 9.02
90 1.512 23.91 4.78 9.56
100 1.68 25.20 5.04 10.08
150
50 0.9 18.44 3.69 7.38
60 1.08 20.20 4.04 8.08
70 1.26 21.82 4.36 8.73
80 1.44 23.33 4.67 9.33
90 1.62 24.75 4.95 9.90
100 1.8 26.08 5.22 10.43
160
50 0.96 19.05 3.81 7.62
60 1.152 20.87 4.17 8.35
70 1.344 22.54 4.51 9.02
80 1.536 24.10 4.82 9.64
90 1.728 25.56 5.11 10.22
100 1.92 26.94 5.39 10.78
3" 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 and clevis hangers or loops has a thermal expansion rate of 0.12/10°F ΔT/100 ft. (3.05mm/5.56°C ΔT/30.48m).
10
50 0.06 5.20 1.04 2.08
60 0.072 5.69 1.14 2.28
70 0.084 6.15 1.23 2.46
80 0.096 6.57 1.31 2.63
90 0.108 6.97 1.39 2.79
100 0.12 7.35 1.47 2.94
20
50 0.12 7.35 1.47 2.94
60 0.144 8.05 1.61 3.22
70 0.168 8.69 1.74 3.48
80 0.192 9.30 1.86 3.72
90 0.216 9.86 1.97 3.94
100 0.24 10.39 2.08 4.16
30
50 0.18 9.00 1.80 3.60
60 0.216 9.86 1.97 3.94
70 0.252 10.65 2.13 4.26
80 0.288 11.38 2.28 4.55
90 0.324 12.07 2.41 4.83
100 0.36 12.73 2.55 5.09
40
50 0.24 10.39 2.08 4.16
60 0.288 11.38 2.28 4.55
70 0.336 12.30 2.46 4.92
80 0.384 13.15 2.63 5.26
90 0.432 13.94 2.79 5.58
100 0.48 14.70 2.94 5.88
50
50 0.3 11.62 2.32 4.65
60 0.36 12.73 2.55 5.09
70 0.42 13.75 2.75 5.50
80 0.48 14.70 2.94 5.88
90 0.54 15.59 3.12 6.24
100 0.6 16.43 3.29 6.57
60
50 0.36 12.73 2.55 5.09
60 0.432 13.94 2.79 5.58
70 0.504 15.06 3.01 6.02
80 0.576 16.10 3.22 6.44
90 0.648 17.08 3.42 6.83
100 0.72 18.00 3.60 7.20
70
50 0.42 13.75 2.75 5.50
60 0.504 15.06 3.01 6.02
70 0.588 16.27 3.25 6.51
80 0.672 17.39 3.48 6.96
90 0.756 18.44 3.69 7.38
100 0.84 19.44 3.89 7.78
Table E-2: PEX pipe expansion arm calculations ½" to 3"