User Guide

Plumbing Design Assistance Manual l Appendix E – Expansion arm and loop calculations l 133
Table E-1: PEX pipe expansion arm calculations ½" to 3"
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, 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).
60
50 0.24 5.50 1.10 2.20
60 0.288 6.02 1.20 2.41
70 0.336 6.51 1.30 2.60
80 0.384 6.96 1.39 2.78
90 0.432 7.38 1.48 2.95
100 0.48 7.78 1.56 3.11
70
50 0.28 5.94 1.19 2.38
60 0.336 6.51 1.30 2.60
70 0.392 7.03 1.41 2.81
80 0.448 7.51 1.50 3.01
90 0.504 7.97 1.59 3.19
100 0.56 8.40 1.68 3.36
80
50 0.32 6.35 1.27 2.54
60 0.384 6.96 1.39 2.78
70 0.448 7.51 1.50 3.01
80 0.512 8.03 1.61 3.21
90 0.576 8.52 1.70 3.41
100 0.64 8.98 1.80 3.59
90
50 0.36 6.73 1.35 2.69
60 0.432 7.38 1.48 2.95
70 0.504 7.97 1.59 3.19
80 0.576 8.52 1.70 3.41
90 0.648 9.04 1.81 3.61
100 0.72 9.52 1.90 3.81
100
50 0.4 7.10 1.42 2.84
60 0.48 7.78 1.56 3.11
70 0.56 8.40 1.68 3.36
80 0.64 8.98 1.80 3.59
90 0.72 9.52 1.90 3.81
100 0.8 10.04 2.01 4.02
110
50 0.44 7.45 1.49 2.98
60 0.528 8.16 1.63 3.26
70 0.616 8.81 1.76 3.52
80 0.704 9.42 1.88 3.77
90 0.792 9.99 2.00 4.00
100 0.88 10.53 2.11 4.21
120
50 0.48 7.78 1.56 3.11
60 0.576 8.52 1.70 3.41
70 0.672 9.20 1.84 3.68
80 0.768 9.84 1.97 3.93
90 0.864 10.43 2.09 4.17
100 0.96 11.00 2.20 4.40
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, 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).
130
50 0.52 8.09 1.62 3.24
60 0.624 8.87 1.77 3.55
70 0.728 9.58 1.92 3.83
80 0.832 10.24 2.05 4.10
90 0.936 10.86 2.17 4.34
100 1.04 11.45 2.29 4.58
140
50 0.56 8.40 1.68 3.36
60 0.672 9.20 1.84 3.68
70 0.784 9.94 1.99 3.98
80 0.896 10.63 2.13 4.25
90 1.008 11.27 2.25 4.51
100 1.12 11.88 2.38 4.75
150
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
160
50 0.64 8.98 1.80 3.59
60 0.768 9.84 1.97 3.93
70 0.896 10.63 2.13 4.25
80 1.024 11.36 2.27 4.54
90 1.152 12.05 2.41 4.82
100 1.28 12.70 2.54 5.08
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, strut and strut clamps
10
50 0.04 2.55 0.51 1.02
60 0.048 2.79 0.56 1.12
70 0.056 3.01 0.60 1.20
80 0.064 3.22 0.64 1.29
90 0.072 3.42 0.68 1.37
100 0.08 3.60 0.72 1.44
20
50 0.08 3.60 0.72 1.44
60 0.096 3.94 0.79 1.58
70 0.112 4.26 0.85 1.70
80 0.128 4.55 0.91 1.82
90 0.144 4.83 0.97 1.93
100 0.16 5.09 1.02 2.04