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Notes on decommissioning and preservation
Interruption in operation
Application:
1. Drain the hot water boiler (boiler including econo-
miser) at < 90 °C.
!
Please note
Draining hot water into the sewage system
causes environmental damage.
Therefore cool the water to < 35 °C before-
hand. If necessary, collect it in containers. If
necessary, consult the local environment
authority.
2. Open the closures on the water side.
3. Dry the boiler system thoroughly.
4. Place desiccant (silica gel) in the boiler system in
accordance with the manufacturer's instructions.
Note
Ensure that the desiccant does not come into
direct contact with the boiler material.
5. Close the boiler system.
6. Check the effectiveness of the desiccant regularly.
Wet preservation
1. Fill the boiler system up to the highest possible
level with treated feedwater.
2. Mix oxygen binder, e.g. sodium sulphite, into the
boiler water in accordance with the manufacturer's
instructions. Mix it thoroughly with the boiler water
by means of thermal or mechanical circulation.
Oxygen binder inhibits oxygen corrosion.
Applicable regulations
Draining preserving solutions
Conditions for draining waste water into sewer sys-
■
tems or the main discharge system
Treatment on the flue gas side
1. Clean the heating surfaces on the flue gas side.
Maintain the alkaline balance of the water used for
cleaning at pH 8 to 9 or, in the case of ammonia,
pH 10.
2. Dry the heating surfaces on the flue gas side (allow
normal air flow).
3. Accelerate the ventilation process by means of a
fan heater. If necessary, open the flue gas shut-off
dampers, then close them again.
16
3 days
>
(cont.)
3. Check the concentration of the oxygen binder reg-
Preserving single boilers in a multi boiler system
The relevant boilers are kept at temperature by having
water from the rest of the boiler system flow through
them.
Corrosion protection of a full boiler shell
A fully filled boiler shell is maintained at a pressure of
0.1 to 0.2 bar using nitrogen, specifically nitrogen 5.0.
!
!
Recommendation
Agree the steps for the preservation of the water side
with the manufacturer of the preserving agent.
Use of preserving agents
■
4. Spray preserving oil, e.g. graphite or varnish, onto
5. Keep the boiler door(s) open. Keep the boiler sur-
6. Employ a desiccant (silica gel).
7. Use a dryer with a fan.
ularly and at least once a month; if necessary, add
more oxygen binder.
Please note
Frost may cause damage to the boiler.
Do not use wet preservation if there is a risk of
frost!
Please note
Do not use layer-forming monoamines.
The use of film-forming polyamines must be
agreed with and approved by the boiler manu-
facturer.
Working instructions and safety datasheets supplied
by the product manufacturer
the combustion chamber walls and hot gas flues,
or apply it with a brush.
faces dry during idle periods.
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