Securiton ASD 535, Mounting And Installation, Page: 19 / 40

Mounting
ASD 535, Mounting and installation, T 140 333 d en 19 / 40
2.5.6 Mounting the sampling pipe
Notice
When mounting the sampling pipe, the points be-
low must be observed and adhered to (see
Sec. 2.5.5):
• Clips and pipe clamps at 1 m intervals are used to fasten
the sampling pipe.
• The tubes must be cut with a pipe cutter to required
lengths. In doing so, ensure that the cut is at a right-angle
to the tube axis. Any projecting burrs must be removed
Fig. 6 .
• The ends of the individual tube pieces are to be slightly
angled with a suitable tool, e.g. slightly bevel with a pipe
peeler, Fig. 6 .
• The individual pipe sections are connected to each other
with fittings. Depending on the used tube material, gluing
as described in Sec. 2.5.2 and 2.5.3 or pressing as de-
scribed in Sec. 2.5.4 is used. The tubes are pushed into
the fittings to the stop,
Fig. 7
.
• The connection points must be absolutely sealed to pre-
vent the wrong air from entering.
• For vertically arranged sampling pipe or parts thereof (e.g.
in a riser or high-rack storage building) make certain that
the tubes cannot slide down (fasten clips directly under fit-
tings as shown in
Fig. 8
).
• The sampling pipe must be fastened so that the tube can
“work” in the clips (linear expansion, see Sec. 2.5.5).
• Beginning at the branching points of the sampling pipe, a
distance of at least 0.2 m must be maintained from the T-
piece to the clips,
Fig. 9
.
• For changes of direction in space surveillance installations,
it is advisable to use 90° bends rather than 90° angles,
Fig. 9
.
• When using flush mounting or in false ceilings, it must be
ensured that the tubes are not able to vibrate.
• How the tubes are laid out – especially for flush mounting
– must be precisely entered in the dimensional data in the
installation plans.
Fig. 6 Cutting the tubes
Fig. 7 Joining the tubes
Fig. 8 Vertical sampling pipe
Fig. 9 90° bend, branching point
Angled cut
Pressure points
Burrs
Bevel
approx. 30º
wrong
correct
wrong
correct
Tube
Sleeve Stop
Tube
Sleeve
Clip
below
fitting
Vertical sampling pipe
90º arc
ASD 535
0,2 m
0,2 m
0,2 m
0,2 m
T-piece
End cap
Clip
Clip
90º arc