13
Attention danger of life!
Customer can possibly provide safety device.
9.1 Cleaning of standpipe (2) and float (2.1)
Purging of connection pipework including case:
Close shutoff valves (W+D).
Slowly open drain valve (A) / plug (6) and drain medium
Slightly open valve D and close after approx. 2 seconds.
Slightly open valve W and close after approx. 2 seconds.
Close drain valve (A) / plug (6).
Close drain valve (A) / plug (6)
Fully open valves W+D after filling of standpipe
If this cleaning was not sufficient, dismount bottom/cover flange (2.3) and
remove float (2.1).
Plant must be pressureless for disassembly works!
Wait until unit has cooled!
Close shutoff valves (W+D).
Open drain valve (A) / plug (6); unit is drained.
Caution! When dismounting, residual medium may escape and further
evaporation is also possible.
Remove cover flange (2.3).
Remove float and clean standpipe and float.
Insert float with top-heavy side upwards into standpipe (top-heavy side with
colour marking).
Always use new gaskets (2.2) when assembling the unit. Tighten bolts of
cover flange / standpipe in several steps using successively opposite diagonal
tightening (see table in chapter 9.2) until reaching tightening torque Md
max
.
Close shutoff valves before carrying out preservation works or chemical
cleaning of the boiler. Or even better: interrupt passage on flange
connection of boiler nozzles by placing blind flanges.
For commissioning see chapter 8.
Design sketch see chapter 5.
9.2 Tightening torques
all.
pressure
PS
[bar]
Tightening torque Md
Md
max
[Nm]
in steps
1
2
3
4
5
6
Summary of Contents for NA7-50
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