Ls
Ls
Fig. A
Fig. B
Fig. C
• In surface mounted installations or installations
in false ceilings and shafts, longitudinal thermal
expansion can be compensated for through careful
• In order to guarantee the free movement of pipes in
an installation inside a vertical shaft with horizontal
branches, the branches must have a minimum free
length Ls and the passage through the side wall of
the shaft should be free and the pipe protected with
a sheath (Fig. A and B).
Where:
Ls = C x
√
(Ø x
Δ
L)
Ls = Length of compensator (mm)
Ø = External diameter of pipe (mm)
C = Material constant
(for insulated pipes C=33)
With
Δ
L = 15.6 mm (previous example),
Ø = 26 mm
the result will be:
Ls = 33 x
√
(26 x 15.6) = 665 mm
PF
PF
PF
L
L
∆
L
∆
L
PF
PS
PS
L
PF
PS
∆
L
∆
L
arrangement of fixed and sliding brackets (points),
depending on the type of installation, thus provid-
ing suitable thermal expansion compensators.
FP: Fixed point
SP: Sliding Point
In case the size of the shaft doesn't allow for a com-
pensator of length Ls, the hole in the side wall should
be increased in size and at the same time the tube
should be protected with an insulating sheath of thick-
ness S
≥
1,5x
Δ
L (Fig. C).
18
GB
2. INSTALLATION
Summary of Contents for Gerpex
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