14
6.5.1. A boiler (boilers), boiler pipes are filled with softened water through a fill line (see Picture
6.4.2 and 6.4.3) as follows:
-
boilers;
-
boiler-house piping and manifolds;
-
heating system.
When filling boilers, boiler piping, and a heating system, air must be extracted respectively
from these components.
If pressure of supply water is lower than required one, operational filling must be done
through the fill line by means of a pump.
In any case, there must be provided a pressure regulating device which, during
replenishment or filling, prevents an increase in the boiler pressure, higher than an operating one,
specified in the boiler certificate.
6.5.2. When necessary (see Section 9), a boiler pressure test must be carried out by using a
hydraulic press, in accordance with requirements set out in Table 5.6.
Table 6.5
Boilers or piping
Test pressure, bar Operating
pressure, bar
Lifting time, min
Preservation
time, min
UT-100; UT-150;
UT-200; UT-250;
UT-320
6
4,0
10
10
6.6. Flue Pipe Connection
6.6.1. A cross-section of flue pipes, connected to the boiler, cannot be smaller than a cross-section
of the outgoing boiler flue pipe (see Table 6.6.1).
Table 6.6.1
Type of boiler
UT - 100 UT - 150 UT - 200 UT - 250 UT - 320
Cross-section, cm
2
600
726
850
980
1227
6.6.2. A flue pipe must be fitted with elevation (at least 10%) from the boiler to the chimney. If
turnings are impossible to avoid, they must be as milder as they can. For a flue pipe cleaning, there
must provided manholes, sealed with air-tight lids, at least every 2.5 m on straight components
and at each turn.
6.6.3. Long flue pipes must be fitted with a compensator to prevent a transfer of the expansion
force to the boiler or other boiler-house equipment.
6.6.4. Flue pipes in cooler areas or outside a building must be insulated.
6.6.5. Flue pipe installation requires to prevent a condensate, resulting for any unforeseen reason,
from entering the boiler. It’s prohibited to fit a condensate drain into a rain water or soil system.
6.6.6. Flue pipe connection and sealing requires the use of only standard proven means.
