Install Instructions

IM-PR 566442 1114 (Design Manual)
42
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
ViegaPEX
Barrier
¾" 19.0 22.0 24.6 26.9 29.1 31.1 33.0 34.8
1" 21.6 24.9 27.9 30.5 33.0 35.3 37.4 39.4
1¼" 23.9 27.6 30.8 33.8 36.5 39.0 41.4 43.6
1½" 26.0 30.0 33.5 36.7 39.7 42.4 45.0 47.4
2" 29.7 34.3 38.3 42.0 45.3 48.5 51.4 54.2
Table 1-10 NOTE: This chart was figured using the maximum run for a single expansion compensator (50 ft.). Refer to
Viega installation manuals for recommended operating temperatures, pressures, tubing fasteners and fastener spacing.
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 ft.).
Following the previous example:
L = C√OD x ∆L
Where:
C = 12
OD = 1.125 (1" PEX)
∆L = 2.30"
L = 12√1.125" x 2.88" = 19.30"
L = 19.30"
L
L = 19.30"
Illustration of Example
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