Install Instructions

IM-PR 566442 1114 (Design Manual)

Z-type expansion offset:

The Z-type expansion offset integrates two 90° elbows that form a “Z” pattern.

With this type of configuration ½ of the “L” dimension is applied to the center area of the “Z” (represented

as L1 in the table and illustration) while ¼ of the “L” dimension would be applied to each of the top and

bottom areas (represented as L2).

Calculate the necessary L1 and L2 dimensions or use the chart below, which was figured using the maxi-

mum run for a single expansion compensator (50 ft.).

L = 19.30"

L1 = ½ (L)

L1 = 19.30"/2 = 9.65"

L1 = 9.65"

L2 = ¼ (L)

L2 = 19.30"/4 = 4.83"

L2 = 4.83"

Z-Type Expansion Offset (in)

per 50 linear feet of run

Tubing

∆T(°F)

Tube

nom.

60 80 100 120 140 160 180 200

L1 L2 L1 L2 L1 L2 L1 L2 L1 L2 L1 L2 L1 L2 L1 L2

ViegaPEX

Ultra

¾" 10.2 5.1 11.8 5.9 13.2 6.6 14.4 7.2 15.6 7.8 16.7 8.3 17.7 8.8 18.6 9.3

1" 11.6 5.8 13.4 6.7 15.0 7.5 16.4 8.2 17.7 8.8 18.9 9.5 20.1 10.0 21.1 10.6

1¼" 12.8 6.4 14.8 7.4 16.5 8.3 18.1 9.1 19.6 9.8 20.9 10.5 22.2 11.1 23.4 11.7

1½" 13.9 7.0 16.1 8.0 18.0 9.0 19.7 9.8 21.3 10.6 22.7 11.4 24.1 12.1 25.4 12.7

2" 15.9 8.0 18.4 9.2 20.5 10.3 22.5 11.3 24.3 12.2 26.0 13.0 27.6 13.8 29.1 14.5

ViegaPEX

Barrier

¾" 9.5 4.8 11.0 5.5 12.3 6.1 13.5 6.7 14.5 7.3 15.6 7.8 16.5 8.2 17.4 8.7

1" 10.8 5.4 12.5 6.2 14.0 7.0 15.3 7.6 16.5 8.2 17.6 8.8 18.7 9.4 19.7 9.9

1¼" 11.9 5.9 13.8 6.9 15.4 7.7 16.9 8.4 18.2 9.1 19.5 9.7 20.7 10.3 21.8 10.9

1½" 13.0 6.5 15.0 7.5 16.8 8.4 18.4 9.1 19.8 9.9 21.2 10.6 22.5 11.2 23.7 11.8

2" 14.8 7.4 17.1 8.6 19.2 9.58 21.0 10.5 22.7 11.3 24.2 12.1 25.7 12.9 27.1 13.5

Table 1-11 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.

L1 = 9.65"

L2 = 4.83"

L2 =4.83"

Illustration of Example