erensan°
“The Heating Engineer”
- 35 –
280111
BOILER HARDWARE OPERATING, INSPECTION AND
MAINTENANCE RULES
Inspection, maintenance and controls of boiler hardware should
be done in compliance with hardware manufacturer’s
instructions.
Safety valves
Generally there should be two safety valves on boilers.
Safety valves should always be in good working order.
Safety valves should be passed through hot test at least once a
year and compliance of opening and closing values with
nominal values should be checked.
For new safety valves, nominal values should absolutely be
controlled regardless of their values set by the manufacturer.
If a leak is seen in the safety valve during operation, the safety
valve is manually opened to remove this leak and steam is
blown down for a short time to enable discharge extraneous
substances that may exist on valve seat. If the leak is still not
removed, the safety valve is removed and repaired after the
boiler is cooled. Spring pressure should not be increased in
leaking safety valves to remove the leak.
During safety valve opening control, the following formula
should be taken into consideration:
P
opening
= 1.05 x P
operating
.
EXAMPLE: Safety valve adjustment pressure for 6 bar
operating pressure:
is found to be: P
opening
= 1.05 x 6 = 6.3 bars
erensan°
“The Heating Engineer”
- 36 –
280111
Feedwater pumps
Before boiler feed pumps are put in operation, the protective
substances applied to shiny external surfaces by manufacturers
for protection purposes should be cleaned off. Pump suction is
checked and water feed provided.
Boiler feed pumps should be utilized in alternation to balance
their operating lives. Bearing grease heads should be checked
and depleted grease should be completed. Water drop leaks on
their gaskets are normal for cooling the shaft. Over squeezing
of gasket retainer to prevent water droplets may cause erosion
of shaft and gasket due to overheating. In case of too much
water leak gasket retainer must be tightened. If it fails to
prevent leak, the gasket should be reinforced. In case, normal
mechanical sounds are heard from pump bearings or pump
internals or frequent thermal cuts happen, authorized pump
service should be contacted.
BOILER INSPECTION AND MAINTENANCE RULES
General
Boiler periodical maintenance should be planned according to
boiler operating conditions and how fast it gets dirty. In normal
operating conditions, smoke side maintenance (turbulator and
smoke pipe cleanup) should be performed at least once in a
week for liquid fuels, at least once in 2 months for gas fuels
and waterside maintenance at least once in 6 months. If the
boiler gets dirty faster due to operating conditions,
maintenance period should be shortened.
Furthermore, for the purpose of removing malfunctions seen in
steam boilers, the boiler should be stopped at least once a year
and the boiler and hardware should be passed from a general
inspection and maintenance.
Taking the boiler out of operation
While steam output is reduced, feedwater should also be cut
down and the flame be lowered. When the flame size goes
down to the desired level, the fuel is cut and flame is put out.
Airflow should be continued for some more time and flammable
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