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BOILER FEED SYSTEM
DATE: 4/3/03
REP:2/1/99
13
Idle boilers are vulnerable to attack when air contacts untreated wet metal surfaces. To prevent
corrosion, the metal must be protected by either keeping the surfaces completely dry or by
excluding air from the system.
PRE-OPERATIONAL CLEANING AND LAY-UP
Proper lay-up techniques must be used on an idle system even if it has never been in operation.
Before pre-operational lay-up, the boiler system must be chemically cleaned as outlined in Section
3.2 and 3.3 of this manual. This is required, as noted in this section, to remove preservatives, oil
and grease.
LAY-UP CONSIDERATIONS
There are two basic methods of steam boiler lay-up; Wet lay-up and Dry lay-up. The method used
depends on:
The possibility that the boiler may need to be placed in operation on short notice.
Disposal of lay-up solutions.
Freezing potential.
Wet Lay-up is recommended for relatively short outages, such as seasonal lay-up. This method
has the advantage of allowing the boiler to be brought on line with short notice. It can pose
problems if there is any likelihood of freezing.
Dry lay-up is recommended for longer periods of boiler shutdown or storage. It is practical only if
the boiler system can be drained hot (120
0
F to 170
0
F) or if external drying can be provided.