Installation
27
LOADING AND SUPPLY OF THE GENERATOR/SYSTEM
The steam generator is fed with a multistage centrifugal pump. The water must reach the pump intake with a certain head in order
to avoid cavitation.
The minimum temperature of the sucked water must be greater than 60°C; this favours the elimination of oxygen which, in any
case, must be completely eliminated with suitable chemicals. Also, a water temperature > 60°C reduces the risk of thermal shock
in the boiler.
The feed tank must be positioned at a height that depends on the temperature of the water in the degasser/feed tank, on the
conformation of the degasser/pump-feed tank connection pipe and on the features of the pump itself (refer to the pump manual).
a
ATTENTION
–
The oxygen dissolved in the water corrodes the boiler. Refer to the maximum allowed values indicated in the relevant
section of the technical manual.
–
Follow the table below to avoid pump cavitation problems.
DEGASSER TYPE
Water supply temperature (°C)
Head on the intake (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.
m
IMPORTANT
–
Avoid using feed water at a temperature below 60°C because rich of dissolved oxygen, thus such to cause corrosion.
HYDROSTATIC HEAD DIAGRAM
Below is an example of hydrostatic head diagram.
H
no
Cooke Industries - Phone: +64 9 579 2185 Email: [email protected] Web: www.cookeindustries.co.nz
