User Guide

Plumbing Design Assistance Manual l Appendix E – Expansion arm and loop calculations l 137
1½" 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).
120
50 0.48 10.60 2.12 4.24
60 0.576 11.61 2.32 4.64
70 0.672 12.54 2.51 5.02
80 0.768 13.41 2.68 5.36
90 0.864 14.22 2.84 5.69
100 0.96 14.99 3.00 6.00
130
50 0.52 11.03 2.21 4.41
60 0.624 12.08 2.42 4.83
70 0.728 13.05 2.61 5.22
80 0.832 13.95 2.79 5.58
90 0.936 14.80 2.96 5.92
100 1.04 15.60 3.12 6.24
140
50 0.56 11.45 2.29 4.58
60 0.672 12.54 2.51 5.02
70 0.784 13.54 2.71 5.42
80 0.896 14.48 2.90 5.79
90 1.008 15.36 3.07 6.14
100 1.12 16.19 3.24 6.48
150
50 0.6 11.85 2.37 4.74
60 0.72 12.98 2.60 5.19
70 0.84 14.02 2.80 5.61
80 0.96 14.99 3.00 6.00
90 1.08 15.90 3.18 6.36
100 1.2 16.76 3.35 6.70
160
50 0.64 12.24 2.45 4.90
60 0.768 13.41 2.68 5.36
70 0.896 14.48 2.90 5.79
80 1.024 15.48 3.10 6.19
90 1.152 16.42 3.28 6.57
100 1.28 17.31 3.46 6.92
Table E-1: 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)
10
50 0.04 3.50 0.70 1.40
60 0.048 3.83 0.77 1.53
70 0.056 4.14 0.83 1.66
80 0.064 4.43 0.89 1.77
90 0.072 4.69 0.94 1.88
100 0.08 4.95 0.99 1.98
2" 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).
20
50 0.08 4.95 0.99 1.98
60 0.096 5.42 1.08 2.17
70 0.112 5.85 1.17 2.34
80 0.128 6.26 1.25 2.50
90 0.144 6.64 1.33 2.66
100 0.16 7.00 1.40 2.80
30
50 0.12 6.06 1.21 2.42
60 0.144 6.64 1.33 2.66
70 0.168 7.17 1.43 2.87
80 0.192 7.66 1.53 3.07
90 0.216 8.13 1.63 3.25
100 0.24 8.57 1.71 3.43
40
50 0.16 7.00 1.40 2.80
60 0.192 7.66 1.53 3.07
70 0.224 8.28 1.66 3.31
80 0.256 8.85 1.77 3.54
90 0.288 9.39 1.88 3.76
100 0.32 9.90 1.98 3.96
50
50 0.2 7.82 1.56 3.13
60 0.24 8.57 1.71 3.43
70 0.28 9.26 1.85 3.70
80 0.32 9.90 1.98 3.96
90 0.36 10.50 2.10 4.20
100 0.4 11.06 2.21 4.43
60
50 0.24 8.57 1.71 3.43
60 0.288 9.39 1.88 3.76
70 0.336 10.14 2.03 4.06
80 0.384 10.84 2.17 4.34
90 0.432 11.50 2.30 4.60
100 0.48 12.12 2.42 4.85
70
50 0.28 9.26 1.85 3.70
60 0.336 10.14 2.03 4.06
70 0.392 10.95 2.19 4.38
80 0.448 11.71 2.34 4.68
90 0.504 12.42 2.48 4.97
100 0.56 13.09 2.62 5.24
80
50 0.32 9.90 1.98 3.96
60 0.384 10.84 2.17 4.34
70 0.448 11.71 2.34 4.68
80 0.512 12.52 2.50 5.01
90 0.576 13.28 2.66 5.31
100 0.64 13.99 2.80 5.60