User Guide
Plumbing Design Assistance Manual l Appendix E – Expansion arm and loop calculations l 141
Table E-2: PEX pipe expansion arm calculations ½" to 3"
½" 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 2.32 0.46 0.93
60 0.072 2.55 0.51 1.02
70 0.084 2.75 0.55 1.10
80 0.096 2.94 0.59 1.18
90 0.108 3.12 0.62 1.25
100 0.12 3.29 0.66 1.31
20
50 0.12 3.29 0.66 1.31
60 0.144 3.60 0.72 1.44
70 0.168 3.89 0.78 1.56
80 0.192 4.16 0.83 1.66
90 0.216 4.41 0.88 1.76
100 0.24 4.65 0.93 1.86
30
50 0.18 4.02 0.80 1.61
60 0.216 4.41 0.88 1.76
70 0.252 4.76 0.95 1.90
80 0.288 5.09 1.02 2.04
90 0.324 5.40 1.08 2.16
100 0.36 5.69 1.14 2.28
40
50 0.24 4.65 0.93 1.86
60 0.288 5.09 1.02 2.04
70 0.336 5.50 1.10 2.20
80 0.384 5.88 1.18 2.35
90 0.432 6.24 1.25 2.49
100 0.48 6.57 1.31 2.63
50
50 0.3 5.20 1.04 2.08
60 0.36 5.69 1.14 2.28
70 0.42 6.15 1.23 2.46
80 0.48 6.57 1.31 2.63
90 0.54 6.97 1.39 2.79
100 0.6 7.35 1.47 2.94
60
50 0.36 5.69 1.14 2.28
60 0.432 6.24 1.25 2.49
70 0.504 6.73 1.35 2.69
80 0.576 7.20 1.44 2.88
90 0.648 7.64 1.53 3.05
100 0.72 8.05 1.61 3.22
½" 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).
70
50 0.42 6.15 1.23 2.46
60 0.504 6.73 1.35 2.69
70 0.588 7.27 1.45 2.91
80 0.672 7.78 1.56 3.11
90 0.756 8.25 1.65 3.30
100 0.84 8.69 1.74 3.48
80
50 0.48 6.57 1.31 2.63
60 0.576 7.20 1.44 2.88
70 0.672 7.78 1.56 3.11
80 0.768 8.31 1.66 3.33
90 0.864 8.82 1.76 3.53
100 0.96 9.30 1.86 3.72
90
50 0.54 6.97 1.39 2.79
60 0.648 7.64 1.53 3.05
70 0.756 8.25 1.65 3.30
80 0.864 8.82 1.76 3.53
90 0.972 9.35 1.87 3.74
100 1.08 9.86 1.97 3.94
100
50 0.6 7.35 1.47 2.94
60 0.72 8.05 1.61 3.22
70 0.84 8.69 1.74 3.48
80 0.96 9.30 1.86 3.72
90 1.08 9.86 1.97 3.94
100 1.2 10.39 2.08 4.16
110
50 0.66 7.71 1.54 3.08
60 0.792 8.44 1.69 3.38
70 0.924 9.12 1.82 3.65
80 1.056 9.75 1.95 3.90
90 1.188 10.34 2.07 4.14
100 1.32 10.90 2.18 4.36
120
50 0.72 8.05 1.61 3.22
60 0.864 8.82 1.76 3.53
70 1.008 9.52 1.90 3.81
80 1.152 10.18 2.04 4.07
90 1.296 10.80 2.16 4.32
100 1.44 11.38 2.28 4.55
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)