PEX Installation Manual

IM-PF 724596 0416
50
Corner Expansion Offset (L, in)
per 50 linear feet of run
Tubing
∆T(°F)
Tube
nom.
60 80 100 120 140 160 180 200
ViegaPEX
&
ViegaPEX
Ultra
¾" 20.4 23.6 26.4 28.9 31.2 33.4 35.4 37.3
1" 23.2 26.7 29.9 32.8 35.4 37.8 40.1 42.3
1¼" 25.6 29.6 33.1 36.2 39.1 41.8 44.4 46.8
1½" 27.8 32.1 35.9 39.4 42.5 45.5 48.2 50.8
2" 31.8 36.8 41.1 45.0 48.6 52.0 55.1 58.1
Corner expansion offset:
Where piping takes a corner after a long straight run, a simple 90° elbow in the piping will allow for the
absorption of expansion.
Calculate the necessary “L” dimension between elbow and nearest fastener or use the chart below,
which was gured using the maximum run for a single expansion compensator (50 feet).
Following the previous example:
L = C√OD x ∆L
Where:
C = 12
OD = 1.125 (1" PEX)
∆L = 2.64"
L = 12√1.125" x 2.64" = 20.7"
L = 20.7"
Compensation distance:
To calculate the dimensions of the expansion compensation offset needed, use the following formula:
L = C√OD x ∆L
Where:
L = length of compensation distance
C = 12 (PEX material specic constant)
OD = outer tubing diameter (⅛" + nominal tube size)
∆L = change in length from temperature change
L = 20.7"
Illustration of Example
Figure 16.1 Corner Expansion
Table 16.2 Corner Expansion
Anchor Point
Anchor Point
Corner Offset
L
LT
∆L