emmeti Gerpex Manuel D'utilisation page 18

2. INSTALLATION
• In surface mounted installations or installations
in false ceilings and shafts, longitudinal thermal
expansion can be compensated for through careful
L
L
PF
FP: Fixed point
SP: Sliding Point
• 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).
Fig. A
Ls
18
L
L
PF
L L
PF
PS
Fig. B
arrangement of fixed and sliding brackets (points),
depending on the type of installation, thus provid-
ing suitable thermal expansion compensators.
PF
PF
Where:
Ls = C x √ (Ø x ΔL)
Ls = Length of compensator (mm)
Ø = External diameter of pipe (mm)
C = Material constant
(for insulated pipes C=33)
With
ΔL = 15.6 mm (previous example),
Ø = 26 mm
the result will be:
Ls = 33 x √ (26 x 15.6) = 665 mm
In case the size of the shaft doesn't allow for a
compensator 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
thickness S≥ 1,5xΔL (Fig. C).
Ls
L
PS
PS
Fig. C
GB