43
ENGLISH
TYPE OF IRREGULARITY
Defective flame with sparks
Flame badly shaped with smoke and
soot
Defective pulsating escaping flame or
receding from the combustion orifice
Corrosion inside the boiler
Soot at the chimney exit.
POSSIBLE CAUSE
1) Atomizing pressure too low
2) Too much combustion air
3) Inefficient nozzle, either fouled up or
worn out
4) Water in the fuel
1) Insufficient combustion air flow
2) Inefficient nozzle, either fouled up or
worn out
3) Combustion chamber unsuitably
designed or too small
4) Delivery nozzle inadequate in respect
to the combustion chamber size
5) Refractory lining unsuitable or exces-
sive
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 flow
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 outflow, for an outside
chimney not adequately heat insulated or
cold air infiltration.
REMEDY
1) Re-set it at the required rating
2) Reduce combustion air flow
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 flow
2) Clean or replace it
3) Reduce the nozzle delivery rate to
suit the combustion chamber ca-
pacity or replace the boiler
4) Increase nozzle delivery rate by re-
placing 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 suit-
able pump (never use the burner
pump for this job)
4) Clean it
5) Reduce combustion air flow
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.
