Installation

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
21
BELLOWS EXPANSION JOINT (LB)
1. Used in diesel or turbine exhaust installation for expansion and vibration
movements.
2. Good for exhaust pressure up to 60 inches of water column, it will compen-
sate for up to 3” max of expansion. See table 14 for maximum run with one
bellow.
3. Bellow joints comes with a liner to protect the bellow and to have a smooth
flow.
4. We suggest to always install a 12” length chimney downstream and upstream
the bellow to insure clearance for the liner and adding accessibility for sup-
porting and guiding. See Figure 51 ‘’bellowjoint’’ for good positioning of the
bellow expansion joint.
5. It is of the most important that the bellow joint be properly supported and
guided in vertical and horizontal orientation.
6. Installation is done the same way as described in section A: Chimney and
fitting joint assembly.
Operating temp. [°F] Max distance with one bellow joint [feet]
700 42.8
800 37.5
900 33.3
1000 30.0
1100 27.3
1200 25.0
1300 23.1
1400 21.4
Table 14 - Maximum run with bellow between each fixed point
SECTION F - THERMAL EXPANSION
Thermal Expansion :
1. When Model DIS / DAS is in use, thermal expansion will occur on
the inner flue and outer casing.
2. A good estimation for thermal expansion is approximately 1” per
100’ chimney length per 100°F rise.
Thermal expansion [inch] = (length[feet]/100)x(
T[°F]/100)
3. Thus, the thermal expansion is dependant on the inner flue temperature
and the length of the chimney between two (2) fixed points.
4. Good installation requires that expansion greater that 1/4” must be
compensated with either a bellow joint (LB) or an adjustable length
(LA). Depending on the pressure of the system.
5. Tees and elbows are not designed to withstand bending moment,
make sure to compensate thermal expansion before connecting to a
tee or a elbow.
6. Expansion joints are not designed to withstand lateral forces so they
must be accurately supported and guided.
7. Because the amount of outer casing movement is the same as the
inner flue, the outer casing must slide to avoid excessive forces on
tees, elbows or fixed points. To accommodate outer casing move-
ments, wall guide, floor guide and suspension bands must allow
movement of the chimney.
8. When supporting a system with considerable height and thermal
expansion, adjustable lengths or bellow joints must be used just
below every fixed support above the first to compensate for thermal
expansion.
9. For engine or turbine exhaust system requiring pressures up to 60
inches of water column, or where the construction must be abso-
lutely gas tight, all welded bellows length (LB) are recommended for
expansion and vibration movements of the exhaust.
10. Low pressure systems, such as boilers (up to 6 inches water column),
can effectively use the Adjustable Length (LA).
11. Spacing of guides and supports, when a thermal expansion part is
used, should not be greater than that specified in Section A, table 7.
12. Proper guiding and support of expansion parts often requires closer
spacing.
EXPANSION JOINTS INSTALLATION
Bellows Expansion Joint (LB) and Adjustable Length (LA) in vertical
runs
1. A Bellows Expansion Joints or Adjustable Length installed vertically
should be installed directly below one chimney length of the highest
support, between fixed points (see Figure 51).
2. Always use Bellows Expansion Joints or Adjustable Lengths between
fixed points when expansion is over 1/4”. See table 14 and Table 15
for maximum run between fixed points.
3. Install proper guiding between fixed points when using Bellows
Expansion Joint or Adjustable Length, to allow chimney vertical
movement due to expansion.
Bellows Expansion Joint and Adjustable Length in horizontal runs
1. Same guidelines apply as for vertical run with respect to expansion
estimate and proper support and guiding with the use of Bellows
Expansion Joint and Adjustable Length.