User Guide

Plumbing Design Assistance Manual l Appendix E – Expansion arm and loop calculations l 157
1½" PEX pipe expansion arm
Delta
T (ΔT)
Run
(ft)
Delta L
(in)
Flexible arm
length (in)
L1
(in)
L2
(in)
160
50 8.8 45.38 9.08 18.15
60 10.56 49.71 9.94 19.88
70 12.32 53.69 10.74 21.48
80 14.08 57.40 11.48 22.96
90 15.84 60.88 12.18 24.35
100 17.6 64.17 12.83 25.67
Table E-3: 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 has a free-body thermal expansion rate of 1.1"/10°F ΔT/100 ft. (27.94mm/5.56°C ΔT/30.48m).
10
50 0.55 12.97 2.59 5.19
60 0.66 14.21 2.84 5.68
70 0.77 15.35 3.07 6.14
80 0.88 16.41 3.28 6.56
90 0.99 17.41 3.48 6.96
100 1.1 18.35 3.67 7.34
20
50 1.1 18.35 3.67 7.34
60 1.32 20.10 4.02 8.04
70 1.54 21.71 4.34 8.68
80 1.76 23.21 4.64 9.28
90 1.98 24.61 4.92 9.85
100 2.2 25.95 5.19 10.38
30
50 1.65 22.47 4.49 8.99
60 1.98 24.61 4.92 9.85
70 2.31 26.59 5.32 10.63
80 2.64 28.42 5.68 11.37
90 2.97 30.15 6.03 12.06
100 3.3 31.78 6.36 12.71
40
50 2.2 25.95 5.19 10.38
60 2.64 28.42 5.68 11.37
70 3.08 30.70 6.14 12.28
80 3.52 32.82 6.56 13.13
90 3.96 34.81 6.96 13.92
100 4.4 36.69 7.34 14.68
50
50 2.75 29.01 5.80 11.60
60 3.3 31.78 6.36 12.71
70 3.85 34.32 6.86 13.73
80 4.4 36.69 7.34 14.68
90 4.95 38.92 7.78 15.57
100 5.5 41.02 8.20 16.41
2" PEX pipe expansion arm
Delta
T (ΔT)
Run
(ft)
Delta
L (in)
Flexible arm
length (in)
L1
(in)
L2
(in)
PEX has a free-body thermal expansion rate of 1.1"/10°F ΔT/100 ft. (27.94mm/5.56°C ΔT/30.48m).
60
50 3.3 31.78 6.36 12.71
60 3.96 34.81 6.96 13.92
70 4.62 37.60 7.52 15.04
80 5.28 40.20 8.04 16.08
90 5.94 42.63 8.53 17.05
100 6.6 44.94 8.99 17.98
70
50 3.85 34.32 6.86 13.73
60 4.62 37.60 7.52 15.04
70 5.39 40.61 8.12 16.24
80 6.16 43.42 8.68 17.37
90 6.93 46.05 9.21 18.42
100 7.7 48.54 9.71 19.42
80
50 4.4 36.69 7.34 14.68
60 5.28 40.20 8.04 16.08
70 6.16 43.42 8.68 17.37
80 7.04 46.41 9.28 18.57
90 7.92 49.23 9.85 19.69
100 8.8 51.89 10.38 20.76
90
50 4.95 38.92 7.78 15.57
60 5.94 42.63 8.53 17.05
70 6.93 46.05 9.21 18.42
80 7.92 49.23 9.85 19.69
90 8.91 52.22 10.44 20.89
100 9.9 55.04 11.01 22.02
100
50 5.5 41.02 8.20 16.41
60 6.6 44.94 8.99 17.98
70 7.7 48.54 9.71 19.42
80 8.8 51.89 10.38 20.76
90 9.9 55.04 11.01 22.02
100 11 58.02 11.60 23.21
110
50 6.05 43.03 8.61 17.21
60 7.26 47.13 9.43 18.85
70 8.47 50.91 10.18 20.36
80 9.68 54.42 10.88 21.77
90 10.89 57.73 11.55 23.09
100 12.1 60.85 12.17 24.34
120
50 6.6 44.94 8.99 17.98
60 7.92 49.23 9.85 19.69
70 9.24 53.17 10.63 21.27
80 10.56 56.85 11.37 22.74
90 11.88 60.29 12.06 24.12
100 13.2 63.55 12.71 25.42