P
ipes and maximum usable lengths
Pipes of painted aluminium-clad steel (minimum thickness
1.5mm), stainless steel (AISI 316) or enamelled steel (minimum
thickness 0.5mm) with a nominal diameter of 80 or 100 mm (for
pipes which run inside the flue maximum diameter 150 mm) can be
used.
The male-female connectors must have a minimum length of 50
mm.
The diameter of the pipes depends on the type of installation. The
stove was designed to take 80 mm diameter pipes but, as shown
in Table 1, in some cases the use of double-lined 100 mm diameter
pipes is recommended.
Losses in pressure associated with a 90° bend can be
compared to those incurred by one metre of pipe. An
inspectable union-tee can be considered equivalent to a 90°
bend.
EXAMPLE: : if installing a section greater than 4.5m in length with
80mm diameter pipe, calculate the maximum usable length in the
following ways:
- If a maximum of three 90° bends are used, the maximum length of
the section will be 4.5m
- If a maximum of two 90° bends are used and bearing in mind that a
90° bend can be replaced by one metre of pipe, the maximum length
of the section will be 4.5m+1m=5.5m
- If a maximum of one 90° bend is used and bearing in mind that a 90°
bend can be replaced by one metre of pipe, the maximum length of
the section will be 4.5m+1m+1m=6.5m
Where 100mm diameter pipe must be used, connect it to the stove
flue outlet with a 80mm union-tee then use a 80mm 100mm adaptor
(not supplied by Piazzetta) (Fig. 19).
Union-tee
The use of this type of fitting must allow for the collection of
condensate mixed with soot, which builds up inside the pipe. It must
also permit periodic cleaning of the flue without the need to
disassemble the pipes.
This type of fitting can be bought at Piazzetta retail outlets together
with the pipes.
An example is given below of a flueway connection, which allows
complete cleaning without having to disassemble the pipes (Fig 20).
English
10
TABLE 1 – LENGHT PIPES
TYPE OF INSTALLATION
WITH 80mm Ø PIPE
WITH DOUBLE-WALLED
100mm Ø PIPE
Maximum length (with three 90° bends) 4.5 m 8 m
For installations more than 1200m above sea level
- Required
Maximum number of bends 3 4
Length of horizontal sections with minimum 3% gradient
2 m 2 m
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