User Guide
Plumbing Design Assistance Manual l Appendix E – Expansion arm and loop calculations l 147
Table E-2: 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 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 4.28 0.86 1.71
60 0.072 4.69 0.94 1.88
70 0.084 5.07 1.01 2.03
80 0.096 5.42 1.08 2.17
90 0.108 5.75 1.15 2.30
100 0.12 6.06 1.21 2.42
20
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
30
50 0.18 7.42 1.48 2.97
60 0.216 8.13 1.63 3.25
70 0.252 8.78 1.76 3.51
80 0.288 9.39 1.88 3.76
90 0.324 9.96 1.99 3.98
100 0.36 10.50 2.10 4.20
40
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
50
50 0.3 9.58 1.92 3.83
60 0.36 10.50 2.10 4.20
70 0.42 11.34 2.27 4.53
80 0.48 12.12 2.42 4.85
90 0.54 12.85 2.57 5.14
100 0.6 13.55 2.71 5.42
1½" PEX pipe expansion arm
Delta
T (ΔT)
Run
(ft)
Delta L
(in)
Flexible arm
length (in)
L1
(in)
L2
(in)
160
50 0.96 14.99 3.00 6.00
60 1.152 16.42 3.28 6.57
70 1.344 17.73 3.55 7.09
80 1.536 18.96 3.79 7.58
90 1.728 20.11 4.02 8.04
100 1.92 21.20 4.24 8.48
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 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).
60
50 0.36 10.50 2.10 4.20
60 0.432 11.50 2.30 4.60
70 0.504 12.42 2.48 4.97
80 0.576 13.28 2.66 5.31
90 0.648 14.08 2.82 5.63
100 0.72 14.84 2.97 5.94
70
50 0.42 11.34 2.27 4.53
60 0.504 12.42 2.48 4.97
70 0.588 13.41 2.68 5.37
80 0.672 14.34 2.87 5.74
90 0.756 15.21 3.04 6.08
100 0.84 16.03 3.21 6.41
80
50 0.48 12.12 2.42 4.85
60 0.576 13.28 2.66 5.31
70 0.672 14.34 2.87 5.74
80 0.768 15.33 3.07 6.13
90 0.864 16.26 3.25 6.50
100 0.96 17.14 3.43 6.86
90
50 0.54 12.85 2.57 5.14
60 0.648 14.08 2.82 5.63
70 0.756 15.21 3.04 6.08
80 0.864 16.26 3.25 6.50
90 0.972 17.25 3.45 6.90
100 1.08 18.18 3.64 7.27
100
50 0.6 13.55 2.71 5.42
60 0.72 14.84 2.97 5.94
70 0.84 16.03 3.21 6.41
80 0.96 17.14 3.43 6.86
90 1.08 18.18 3.64 7.27
100 1.2 19.16 3.83 7.66
110
50 0.66 14.21 2.84 5.68
60 0.792 15.57 3.11 6.23
70 0.924 16.81 3.36 6.73
80 1.056 17.98 3.60 7.19
90 1.188 19.07 3.81 7.63
100 1.32 20.10 4.02 8.04
120
50 0.72 14.84 2.97 5.94
60 0.864 16.26 3.25 6.50
70 1.008 17.56 3.51 7.03
80 1.152 18.78 3.76 7.51
90 1.296 19.91 3.98 7.97
100 1.44 20.99 4.20 8.40