ICI Caldaie ECOVAPOR Series, Инструкция по установке, использованию и техническому обслуживанию

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First commissioning
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5
First commissioning
PRELIMINARY ACTIVITIES TO BE CARRIED OUT BEFORE THE "FIRST" COMMISSIONING
m
IMPORTANT
Before feeding the steam generating system, it is recommended to perform a "Boiling out" with consequent
passivation, in order to remove any machining residues. Taking into account the high risk resulting from wrong
chemical treatments, the operation must be carried out by
Qualified Personnel
.
The
ECOVAPOR/system
is fed by means of a multi-stage centrifugal pump. Water must reach pump suction with quite a high head
in order to avoid possible cavitation phenomena.
The minimum temperature of sucked water must be higher than 60 °C in order to favour oxygen elimination that, in any case,
must be completely eliminated with suitable chemical agents. In addition, if water temperature is >60°C the risk of thermal shock
inside the generator will be reduced.
The height of installation of the feed reservoir depends on the water temperature inside deaerator/feed reservoir, on the structure
of the connecting pipe between deaerator/reservoir and pump and on the characteristics of the pump (refer to the pump manual).
a
ATTENTION
The oxygen dissolved in water causes corrosion inside boiler. Refer to the maximum allowed values specified in the
specific section of this manual.
Follow the table below to avoid pump cavitation problems.
DEGASSER TYPE Water supply temperature (°C) Head (H) on suction (metres)
Atmospheric degasser
60 1
70 2
80 3
90 4,5
0.5 bar pressurised thermo-physical
degasser
105 6
Pressurised thermophysical deaerator (3
bar)
120
[1]
7
[1] Maximum pump suction temperature is 120 °C.
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ATTENTION
–
Avoid using feed water at a temperature below 60°C because rich of dissolved oxygen, thus such to cause corrosion.
–
Before starting the feed pump(s), operate the bleed valve and eliminate all the air present inside the pipe.
HYDROSTATIC HEAD DIAGRAM
Below is an example of hydrostatic head diagram.
A
H
A = value variable based on the type of system.