15
The vent valve opening should be adjusted accordingly until proper temperature is
indicated.
8.0 SHUT-DOWN
8.1 Temporary (overnight, weekend, etc.)
Recommended procedure is to allow deaerated water to remain in storage section while
maintaining steam pressure in the vessel. Close water inlet and outlet valves.
8.2 Long Term Idle Periods
The deaerator may be shut-down completely with no steam pressure in the unit.
Deaerated water may remain in the vessel. Water inlet valve must be closed before
eliminating steam pressure. Cold water entering the unit will condense the steam,
causing a vacuum condition, which could result in collapse of the vessel.
9.0 START-UP AFTER SHUT-DOWN
9.1 Pressure maintained
When steam pressure has been maintained in the deaerator during temporary
shutdown, it is only necessary to open the water inlet valve and gradually bring flow to
required capacity. Recheck adjustments to maintain proper operating levels, and open
outlet valve.
9.2 Pressure not maintained
When steam pressure has not been maintained, first drain scrubber completely, close
valve and proceed in accordance with Section 5.2 or 5.3 (START-UP) as appropriate.
CAUTION: The above described procedures must be followed to prevent oxygen
contamination of stored water, water hammer and rumble in the deaerator scrubber
section.
10.0 OPERATING RECORD
A per shift or per day record of deaerator steam and water pressures, and temperatures
should be maintained. Inspection of all gauges and controls for proper operation should
be made at the same intervals.
11.0 MAINTENANCE
11.1 Vessel
11.1.1 Bi-weekly
Clean gauge glasses and inspect all controls for proper operation. Lubricate all moving
parts as required.
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