6.5.2 WATER LEVEL GAUGE (SIGHT GLASS) BLOWDOWN
1B 1B
1C
1C
1A 1A
1C
1A
Figure. 19 - Water Level Gauge (Klinger Sight Glass) Operating Positions
Blowdown the water level gauge (sight glass).
1.
Open the water level gauge glass blowdown valve A
2.
Close (for approx. 3 seconds) the top gauge valve B
3.
Open valve B
4.
Close (for approx. 3 seconds) the bottom gauge valve C
5.
Open valve C
6.
Close valve A
On completion of the blowdown procedure ensure that all isolation valves (B and C) are OPEN
and all blowdown valves (A) are CLOSED.
The level gauge isolation valves are equipped with an internal ball check. In the event that a sight
glass should break, the ball will set, preventing discharge of steam and water. The valve stem
must be opened fully to enable this feature. If the valve is in any other position, the ball will not
seat.
Note: Where a boiler is operating continuously at steam pressure, advice should be taken from Fulton Ltd as to
the appropriate blowdown procedure
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