Securiton ASD 531, Technical Description

Page: 57 / 105

Mounting
ASD 531, Technical description, T 140 416 en 57 / 105
5.5.6 Mounting the sampling pipe
Notice
When mounting the sampling pipe, make sure
the points listed below are noted and observed
(see Sec. 5.5.5).
•
Clips and pipe clamps at 1 m intervals are used to fasten
the sampling pipe.
•
The tubes must be cut to size using a pipe cutter. In doing
so, ensure that the cut is at a right-angle to the tube axis.
Remove any projecting burrs,
Fig. 19 .
•
The ends of the individual tube pieces are to be bevelled
slightly using a suitable tool, e.g. slightly bevel with a pipe
scraper,
Fig. 19 .
•
The individual tube sections are connected using fittings.
Depending on the tube material used, use either the adhe-
sive process described in Sec. 5.5.2 and 5.5.3 or the
pressing process described in Sec. 5.5.4. The tubes are
pushed into the fittings as far as the stop,
Fig. 20 .
•
The connection points must be sealed tight to prevent the
intake of any leakage air.
•
If the sampling pipe or parts thereof is laid out vertically
(e.g. in a riser), make sure the tubes cannot slide down
(secure clips directly below the fittings as shown in
Fig.
21 ).
•
The sampling pipe must be fastened so that the tube is
able to “operate” within the clips (linear expansion, see
Sec. 5.5.5).
•
A distance of at least 0.2 m must be maintained from the
T-piece to the clips, starting from the branching points of
the sampling pipe,
Fig. 22 .
•
For changes of direction in the space surveillance, it is ad-
visable to use 90° bends rather than 90° angles, Fig. 22
(see also Sec. 4.4.2).
•
For flush mounting or mounting in false ceilings, ensure
that the tubes are not able to start oscillating by them-
selves.
•
The exact definitive layout of the tubes – particularly in the
case of flush mounting – must be documented precisely on
the installation plans complete with dimensions.
Fig. 19 Cutting the tubes
Fig. 20 Assembling the tubes
Fig. 21 Vertical sampling pipe
Fig. 22 90° bend, branching point
Angled cut
Pressure points
Burrs
Bevel
approx. 30°
wrong
correct
wrong
correct
Tube
Sleeve
Stop
Tube
Sleeve
Clip
below
fitting
Vertical sampling pipe
90° arc
ASD 531
0.2 m
0.2 m
0.2 m
0.2 m
T-piece
End cap
Clip
Clip
90° arc