Requirements, Connecting Pipe - eta SH Installation Manual

Requirements, connecting pipe

Chimney renovation with stainless steel pipe?
Maybe the chimney has already been renovated
for oil or gas with a stainless steel pipe, and now
a conversion to wood or pellets is planned. Or
the chimney is too tight to install a ceramic pipe
with a sure seal. If a moisture-resistant inner pipe
is installed in a sufficiently fire-resistant casing,
the German association of chimney sweeps has
found the following solution to the standards and
regulations dilemma:
"in the certification of suitability and safe use
for heating systems, it should be noted that
after a soot fire the long-term durability cannot
be ensured and penetration of the chimney by
moisture cannot be ruled out so that it may be
necessary to replace the inner pipe (Criteria for
Determination of Suitability and Safe Use of Heating
Systems - October 29
Replace inner pipe after a soot fire
After a soot fire, the inner pipe is in all likelihood
no longer sufficiently leakproof, making the
chimney subject to damage by moisture so that
the inner pipe needs to be replaced without fail,
regardless of whether its resistance to soot fires has
been checked or not.
Fit the chimney connection
just under the ceiling!
Even though the current boiler can be connected
to the chimney at a low height, it is better if you
fit the chimney connection just below the ceiling.
The flue pipe is easier to install, and the vertical
connection pipe is long enough for an emission
measurement.
Structure-borne noise
To avoid structure-borne noise, there should not
be a fixed connection between the flue pipe and
the chimney!
Good exhaust systems are acoustically isolated.
When steel pipes are connected to a fireclay
chimney, ceramic fibre bandages have proven
effective at preventing structure-borne noise as
well as damage to the refractory sleeve.
12
2008, page 12).
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Connecting pipe to chimney insulated
The connection between the boiler and the
chimney should be insulated with at least 30
mm, preferably 50 mm, of mineral wool to avoid
thermal losses that can lead to a build-up of
condensation.
Cleaning aperture in the connecting pipe
Easily accessible cleaning apertures must be
available for cleaning the flue pipe.
Install short, airtight and ascending connections
"Attractive" right-angle flue offsets with two or
more bends are bad in a flue gas conduit. The
optimum to strive for is the shortest pipe from the
boiler to the chimney with a minimum of direction
changes.
The flue gas conduit to the chimney must be
leakproof (use heat-resistant silicone covered with
pure aluminium adhesive tape to seal sleeved pipes
without gaskets); otherwise smoke emission into
the boiler room can be expected during ignition.
Install the flue gas conduit so it ascends toward the
chimney!
Long, horizontal flue gas conduits to the chimney
Use a tight cross section, apply above-average
insulation (50 mm and more) and provide enough
cleaning apertures.
Calculations indicate that a connecting pipe with
a large cross section would reduce the required
chimney cross section. However, with low flow
speeds ash deposits will form and then the
theoretically calculated flue draught will be lost
again.
With a large chimney cross section, the unbent
length of the connecting pipe can be at maximum
half of the effective chimney height (calculation
required).
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