750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
3-15
3.10 — Preparation for Extended Lay-Up
water and steam valves should be closed. Damper and vents should be closed to prevent air from reaching fireside
surfaces. Periodic inspection should be made and absorption materials renewed.
Wet storage is generally used for a boiler held in stand-by condition or in cases where dry storage is not practical.
The possibility of freezing temperatures must be considered. Care must again be taken to protect metal surfaces.
Variables preclude definite recommendations. However, it is suggested that the pressure vessel be drained, thor-
oughly cleaned internally, and re-filled to overflowing with treated water. If deaerated water is not available, the unit
should be fired to boil the water for a short period of time. Additional chemicals may be suggested by your local
Cleaver-Brooks authorized representative to minimize corrosion. Internal water pressure should be maintained at
greater than atmospheric pressure. Nitrogen is often used to pressurize the vessel. Fireside surfaces must be thor-
oughly cleaned and the refractory should be wash-coated.
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