Pipes and maximum usable lengths
Pipes of painted aluminium-clad steel (minimum thickness 1.5 mm),
stainless steel (AISI 316) or enamelled steel (minimum thickness 0.5
mm) 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 4.5 m in length with 80
mm 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
4.5 m
- 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
4.5 m+1 m=5.5 m
- 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
4.5 m+1 m+1 m=6.5 m
Where 100 mm diameter pipe must be used, connect it to the stove flue
outlet with a 80 mm union-tee then use a 80 mm 100 mm 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
GENERAL RULES
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
RACCORDO A T CON TAPPO
A CHIUSURA ERMETICA
RACCORDO
ø 80 > ø 100
ø 80mm
ø 100mm
DT2030337-00
Fig. 19
ISOLANTE
RACCORDO A T
RACCORDO A T
DIREZIONE
DI PULIZIA
DIREZIONE DI PULIZIA
Max 2m
(min. 3%)
DIREZIONE DI PULIZIA
DT2030338-00
Fig. 20
Straight reducer
ø 80 > ø 100
Tee with sealing plug
Insulating material
Tee
Tee
Direction of
cleaning
Direction of cleaning
Direction of cleaning
