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0006081053 - ed 2006/12
TYPE OF IRREGULARITY
Defective fl ame with sparks
Flame badly shaped with smoke
and soot
Defective pulsating escaping fl ame
or receding from the combustion
orifi ce
Corrosion inside the boiler
Soot at the chimney exit.
POSSIBLE CAUSE
1) Atomizing pressure too low
2) Too much combustion air
3) Ineffi cient nozzle, either fouled up or
worn out
4) Water in the fuel
1) Insuffi cient combustion air fl ow
2) Ineffi cient nozzle, either fouled up or
worn out
3) Combustion chamber unsuitably de-
signed or too small
4) Delivery nozzle inadequate in respect to
the combustion chamber size
5) Refractory lining unsuitable or excessive
6) Boiler or chimney ducts clogged
7) Low atomizing pressure
1) Excessive draught (only when there is a
suction fan in the chimney)
2) Inefficient nozzle, either fouled up or
worn out
3) Water in the fuel
4) Dirty disk
5) Excessive combustion air fl ow
6) Air passage between disk and blast tube
1) Boiler operating temperature too low
(below the dew point)
2) High sulphur content in the fuel
3) Smoke temperature too low (below 180
°C)
1) Excessive cooling (below 180°C) of smoke
before exit outfl ow, for an outside chimney
not adequately heat insulated or cold air
infi ltration.
REMEDY
1) Re-set it at the required rating
2) Reduce combustion air fl ow
3) Clean it or replace it
4) Remove it from the tank using a
suitable pump (never use the burner
pump for this job)
1) Increase combustion air fl ow
2) Clean or replace it
3) Reduce the nozzle delivery rate to
suit the combustion chamber capac-
ity or replace the boiler
4) Increase nozzle delivery rate by
replacing it
5) Modify it or make it lighter according
to boiler manufacturer’s instructions
6) Clean them
7) Rectify and re-set at the required
value
1) Adjust the suction fan speed by
changing the pulley diameter
2) Clean or replace it
3) Remove it from the tank with a suitable
pump (never use the burner pump for
this job)
4) Clean it
5) Reduce combustion air fl ow
6) Rectify the position of the blast tube
1) Increase the operating temperature
2) Change grade of fuel
3) Increase the nozzle delivery rate by
replacing it
1) Improve insulation and close any gap
letting cold air in.
HOW TO FIND THE CAUSES OF IMPROPER WORKING OF BURNERS
USING TWO-STAGE LIGHT OIL AND HOW TO RECTIFY THEM
