DURAG D-R 290, Operating Manual

Page: 75 / 202

5 | Installation
D-R 290 75
Example for double-walled flues
With double-walled or multiple-walled flues also an initial opening is made in the outer
wall. If the installation is on the inner wall the opening in the outer wall should be
somewhat larger. An appropriate opening is then made in the inner wall. The proce­
dure depends on the materials as in the examples in the preceding section. The an­
chor plate, welding or the gusset plate for the welded-in pipes with adjustment flanges
should ideally be installed on the inner wall, so as to retain the gases within the duct.
Seal the installation opening in the outer wall, leaving clearance to allow movement of
the flanged tube due to thermal expansion. Any additional mounting of the flanged
tube on the outer wall must also allow this movement.
Please observe the maximum length of the welded-in pipe (see
Table 4.13 ) and the
tube cross sections associated with it, which is limited due to the measurement beam.
For tube lengths 600 mm and greater, the pitch circle diameter and flange diameter
are different, and so is the system to be used. Comply also with the instructions and
specifications as for the standard installation ( 5.4.1 Standard installation of the wel­
ded-in pipes with adjustment flanges [
}
70] ).
1 Duct wall 2 Gusset plate
3 Welded-in pipe 4 Red dot at the top of the flange
5 Attaching the gusset plate to stack
wall
6 Flexible seal
7 Temporary displacement of the wel­
ded-in pipe
Fig. 5.8: Installation of a welded-in pipe with adjustment flange in a double-walled flue