User Guide

Plumbing Design Assistance Manual l Appendix E – Expansion arm and loop calculations l 145
Table E-2: 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 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).
50
50 0.3 7.71 1.54 3.08
60 0.36 8.44 1.69 3.38
70 0.42 9.12 1.82 3.65
80 0.48 9.75 1.95 3.90
90 0.54 10.34 2.07 4.14
100 0.6 10.90 2.18 4.36
60
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
70
50 0.42 9.12 1.82 3.65
60 0.504 9.99 2.00 4.00
70 0.588 10.79 2.16 4.32
80 0.672 11.53 2.31 4.61
90 0.756 12.23 2.45 4.89
100 0.84 12.90 2.58 5.16
80
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
90
50 0.54 10.34 2.07 4.14
60 0.648 11.33 2.27 4.53
70 0.756 12.23 2.45 4.89
80 0.864 13.08 2.62 5.23
90 0.972 13.87 2.77 5.55
100 1.08 14.62 2.92 5.85
100
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
110
50 0.66 11.43 2.29 4.57
60 0.792 12.52 2.50 5.01
70 0.924 13.53 2.71 5.41
80 1.056 14.46 2.89 5.78
90 1.188 15.34 3.07 6.13
100 1.32 16.17 3.23 6.47
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 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).
120
50 0.72 11.94 2.39 4.78
60 0.864 13.08 2.62 5.23
70 1.008 14.13 2.83 5.65
80 1.152 15.10 3.02 6.04
90 1.296 16.02 3.20 6.41
100 1.44 16.89 3.38 6.75
130
50 0.78 12.43 2.49 4.97
60 0.936 13.61 2.72 5.45
70 1.092 14.70 2.94 5.88
80 1.248 15.72 3.14 6.29
90 1.404 16.67 3.33 6.67
100 1.56 17.57 3.51 7.03
140
50 0.84 12.90 2.58 5.16
60 1.008 14.13 2.83 5.65
70 1.176 15.26 3.05 6.10
80 1.344 16.31 3.26 6.53
90 1.512 17.30 3.46 6.92
100 1.68 18.24 3.65 7.30
150
50 0.9 13.35 2.67 5.34
60 1.08 14.62 2.92 5.85
70 1.26 15.79 3.16 6.32
80 1.44 16.89 3.38 6.75
90 1.62 17.91 3.58 7.16
100 1.8 18.88 3.78 7.55
160
50 0.96 13.79 2.76 5.51
60 1.152 15.10 3.02 6.04
70 1.344 16.31 3.26 6.53
80 1.536 17.44 3.49 6.98
90 1.728 18.50 3.70 7.40
100 1.92 19.50 3.90 7.80
1½" PEX pipe expansion arm
Delta
T (ΔT)
Run
(ft)
Delta L
(in)
Flexible arm
length (in)
L1
(in)
L2
(in)
10
50 0.06 3.75 0.75 1.50
60 0.072 4.10 0.82 1.64
70 0.084 4.43 0.89 1.77
80 0.096 4.74 0.95 1.90
90 0.108 5.03 1.01 2.01
100 0.12 5.30 1.06 2.12