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Unical Ellprex Manual

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31
5.3 - EXTRAORDINARY
MAINTENANCE
Extraordinary maintenance of end season
or for long periods of inactivity.
It will be necessary to perform all the operations
described in the preceding chapter and
besides:
- Check the state of consumption of the
turbulators to replace them in time.
- To facilitate the extraction of the turbulators,
with the ELLPREX boilers a special extractor
is supplied.
- After the cleaning of the smoke circuit it
is convenient to pass in the smoke pipes
and in the furnace with a rag soaked of
diluted solution of caustic soda.
After having let to dry cross again all the
surfaces with a rag soaked of oil.
Perfectly close the the burner air intake
to avoid a continuous passage of damp air
through the boiler recalled by the chimney
it self.
It is advisable to put inside the furnace
some alive mortar that has an hygroscopic
action.
- Do not empty the C.H. system and the
boiler.
- Protect the screws with graphitized fat,
nuts and pivots of the door.
- Show all the operations that must be
perform to the following put into operation
particularly the operation of the shunt
pump must be checked.
5.4 - CLEANING OF THE
BOILER
Follow the next sequence:
- Close the feeding of the oil.
- Cooldown the boiler to the ambient
temperature.
- Switch Off the electrical supply to the boiler
and the burner.
- Open the front door.
- Shake and remove the turbulators every
15-20 days of activity of the boiler to avoid
that the residues of combustion can stop
them so much to make difficult their removal.
- Clean the turbulators and the smoke pipes
by brushing them with the brush supplied.
- Reposition the turbulators.
- Remove the cleaning door and all the soot
from the smoke chamber.
- Re-fit the cleaning doors.
- Verify the state of the refractory insulation
of the combustion chamber door.
- Verify the state of the door sealing rope.
- Close the door of the furnace.
5.5 - CHECK OF THE
BOILER OPERATION
For a safe operation of the boiler it is necessary
to check:
- The good operation of the working
thermostat.
5.6 - CHECK OF THE
BURNER OPERATION
- See the burner instruction manual.
- Follow all the local requirement in terms
of burner maintenance .
- The good operation of the high limit
thermostat.
- The adjustment and the good operation
of the minimum thermostat.
- The good operation of the shunt system.
- The good operation of the outer
compensator (if fitted).
- The good operation of all the other safety
and control devices imposed by local
requirements.
that cannot be attributed to the constructive
geometry and/or to the materials used and/
to the constructive technique and, therefore,
they are not covered by guarantee.
On the occasion of the ordinary maintenance
it is useful to perform a small discharge from
the boiler to verify if sludges escape.
In affirmative case, it will be necessary to
prolong the discharge up to get clear water.
At the end of the drainage it will be necessary
to reestablish the level of the water in the
system.
At the end of the smoke circuit cleaning, to
the next restart check around the burner plate
and the smoke chamber for smoke leaks. In
the case some smoke leaks were noticed,
first of all tighten the screws fitting the smoke
5.7 - BOILER HOUSE
For the combustion of oil or gas the burner
needs air.
Accordingly wide openings are foreseen for
the entry of the air in the boiler house.
These openings never have to be obstructed.
Maintain the boiler house clean and dust free.
The boiler is not a closet: avoid to store any
kind of materials.
Maintain the entry of the boiler free and easy
to reach in any moment.
Ascertain that the boiler house is endowed
with efficient emergency lamp.
cleaning doors on the smoke chamber.
Besides it will be necessary to verify the good
operation of the protection and control
devices (thermostats, thermometers) of the
boiler and of the plant (manometers, flow
and pressure switches, expansion vessels)
and all the safety devices.
In this occasion it will be necessary to notice
the quantity of reinstatement water used and
decide, also in base to its hardness, an
intervention of preventive descaling.
It must be considered that the calcium and
magnesium salts dissolved in the raw water,
with repeated reinstatements, can cause
deposits in the boiler that hinder the inner
circulation and subsequent overheating of
the wall plates with possible serious damages
and, not getting result, it will be necessary to
replace the sealing gasket.
Similarly it will be necessary to act on the
front door, increasing at first the tightening
of the nuts (after having loosened the inner
counternuts) and then, if necessary, by
replacing the whole gasket.
If it was necessary to center the sealing
gaskets on the sealing ring of the door it is
possible to adjust the door position by acting
as suggested on the paragraph 2.6.
At the end check and, if necessary, restore
the sealing of the connection of the chimney
and of the burner with the door.
The performed operations must be recorded
on the log book of C.H. system.
… 31


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