erensan°
“The Heating Engineer”
- 27 –
280111
have been made and faultless operation status of the system
should have been provided.
After making sure all discharge and release valves, level indicator
relief valves and control valves are in working condition and leak-
proof, these should be closed.
Water with required chemical specifications (see: Boiler
feedwater specifications, page 41) should be filled into the boiler
up to the normal water level seen on page 28. During this
operation, while water fills the boiler, air valves should be
opened to prevent trapping of air at any part.
When the boiler is filled up to the desired level, water feeding
should be stopped. Water level column and level indicator
discharge valves should be opened fully and some discharge
should be allowed to determine whether blockages exist in valves
and pipes. Controls should be made by performing blowdowns
from others discharge valves related to the boiler. It should be
ensured that the main steam pressure gage shows the correct
value (furthermore, the connections of the pressure gage with
the boiler should be checked).
If the boiler is not attached to the main steam pipe with only one
valve, the steam outlet valve should be checked by opening and
closing it and ensured to function well. This valve should not be
tightened too much to prevent getting stuck from heat expansion
when steam is produced. When the boiler is heated and steam
starts to come from the discharge pipe, the air in the boiler
should be allowed to bleed off with steam waiting for some time
and the discharge valve should be tightened fully. Because water
level will rise as boiler water is heated, the water level should be
kept constant by discharging from the bottom.
The nuts on boiler feet should be loosened to free the bolts.
erensan
°
“The Heating Engineer”
- 28 –
280111
Operating and first start
• Check system and boiler connections.
• Fill boiler with chemically suitable water up to the
required level. The air discharge valve of boiler should
be kept open to enable air discharge during water filling.
(The air discharge valve should be kept open until steam
is seen to come out.) When the water level is
satisfactory, the boiler feed device will automatically
stop the feeding pump. The bottom and surface
discharge valves and boiler feeding device and level
gage valves should be opened to check any blockage.
• During the first run of the boiler or during initial ignition
of a cold boiler, the burner should be fired so that it will
run for 10 minutes and wait for 10 minutes at 1
st
level
small flame for at least 1 hour to let pressure and
temperature rise gradually and to prevent thermal stress
forming on boiler.
• When the boiler starts to build up pressure, the steam
outlet valve should be opened a little to let steam into
the system for gradual warm up. When steam pressure
reaches ¼ operating pressure, the burner should be
stopped and waited for 5-10 minutes for balanced heat
distribution to system. Then firing should be resumed by
restarting the burner and the operating pressure should
be reached as slowly as possible. When the steam
pressure reaches the adjusted pressurestat level, the
burner will stop and further rising of pressure will be
prevented.
• After the boiler operating pressure is reached, the
surface discharge should be opened for 10 seconds and
the lower discharge for 5 seconds to flush undesired
substances from the boiler. In order to prevent human
errors and negligence in the operation of your boiler,
usage of automatic discharge systems is recommended.
• For boilers without automatic discharge systems, boiler
water should be analyzed and surface discharging
should be done more frequently when the conductivity
coefficient is found to be high and bottom discharging
should be done more frequently when hardness value is
high.
• Boiler and feed water analyses should be repeated
periodically. If any negative analysis results are
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