User Guide

Plumbing Design Assistance Manual l Appendix E – Expansion arm and loop calculations l 143
¾" 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 8.69 1.74 3.48
60 0.72 9.52 1.90 3.81
70 0.84 10.29 2.06 4.12
80 0.96 11.00 2.20 4.40
90 1.08 11.67 2.33 4.67
100 1.2 12.30 2.46 4.92
110
50 0.66 9.12 1.82 3.65
60 0.792 9.99 2.00 4.00
70 0.924 10.79 2.16 4.32
80 1.056 11.53 2.31 4.61
90 1.188 12.23 2.45 4.89
100 1.32 12.90 2.58 5.16
120
50 0.72 9.52 1.90 3.81
60 0.864 10.43 2.09 4.17
70 1.008 11.27 2.25 4.51
80 1.152 12.05 2.41 4.82
90 1.296 12.78 2.56 5.11
100 1.44 13.47 2.69 5.39
130
50 0.78 9.91 1.98 3.97
60 0.936 10.86 2.17 4.34
70 1.092 11.73 2.35 4.69
80 1.248 12.54 2.51 5.02
90 1.404 13.30 2.66 5.32
100 1.56 14.02 2.80 5.61
140
50 0.84 10.29 2.06 4.12
60 1.008 11.27 2.25 4.51
70 1.176 12.17 2.43 4.87
80 1.344 13.01 2.60 5.21
90 1.512 13.80 2.76 5.52
100 1.68 14.55 2.91 5.82
150
50 0.9 10.65 2.13 4.26
60 1.08 11.67 2.33 4.67
70 1.26 12.60 2.52 5.04
80 1.44 13.47 2.69 5.39
90 1.62 14.29 2.86 5.71
100 1.8 15.06 3.01 6.02
160
50 0.96 11.00 2.20 4.40
60 1.152 12.05 2.41 4.82
70 1.344 13.01 2.60 5.21
80 1.536 13.91 2.78 5.56
90 1.728 14.76 2.95 5.90
100 1.92 15.55 3.11 6.22
Table E-2: PEX pipe expansion arm calculations ½" to 3"
1" 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 3.12 0.62 1.25
60 0.072 3.42 0.68 1.37
70 0.084 3.69 0.74 1.48
80 0.096 3.94 0.79 1.58
90 0.108 4.18 0.84 1.67
100 0.12 4.41 0.88 1.76
20
50 0.12 4.41 0.88 1.76
60 0.144 4.83 0.97 1.93
70 0.168 5.22 1.04 2.09
80 0.192 5.58 1.12 2.23
90 0.216 5.92 1.18 2.37
100 0.24 6.24 1.25 2.49
30
50 0.18 5.40 1.08 2.16
60 0.216 5.92 1.18 2.37
70 0.252 6.39 1.28 2.56
80 0.288 6.83 1.37 2.73
90 0.324 7.24 1.45 2.90
100 0.36 7.64 1.53 3.05
40
50 0.24 6.24 1.25 2.49
60 0.072 3.42 0.68 1.37
70 0.084 3.69 0.74 1.48
80 0.096 3.94 0.79 1.58
90 0.108 4.18 0.84 1.67
100 0.12 4.41 0.88 1.76
50
50 0.3 6.97 1.39 2.79
60 0.36 7.64 1.53 3.05
70 0.42 8.25 1.65 3.30
80 0.48 8.82 1.76 3.53
90 0.54 9.35 1.87 3.74
100 0.6 9.86 1.97 3.94
60
50 0.36 7.64 1.53 3.05
60 0.432 8.37 1.67 3.35
70 0.504 9.04 1.81 3.61
80 0.576 9.66 1.93 3.86
90 0.648 10.25 2.05 4.10
100 0.72 10.80 2.16 4.32
70
50 0.42 8.25 1.65 3.30
60 0.504 9.04 1.81 3.61
70 0.588 9.76 1.95 3.90
80 0.672 10.43 2.09 4.17
90 0.756 11.07 2.21 4.43
100 0.84 11.67 2.33 4.67