CleaverBrooks FLX Operation, Service And Parts Manual page 64

Chapter 3
WARNING
! DANGER
Materials described in this section may be
considered hazardous under the U.S.
Occupational Safety and Health Act of 1970.
Material Safety Data Sheets should be
obtained and understood prior to the use of
these products to avoid the possibility of
serious personal injury or death.
Wet Storage
Note: It is always best to consult with a
w a t e r t r e a t m e n t c o n s u l t a n t b e f o r e
proceeding with extended layup.
Wet storage is used when the boiler will be out of service for
shorter periods of time, when a boiler is held in standby
conditions, or in cases where dry storage is not practical. The
boiler held in wet storage can be brought back into service
more quickly than one held in dry storage. However, the
3-10
possibility of freezing temperatures must be considered.
Again, take care to protect metal surfaces. Because of the
number of variables, it is difficult to offer definite
recommendations. However, it is suggested that the pressure
vessel be drained, thoroughly cleaned internally, and refilled
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 in order to drive off
oxygen in the water.
Tightly close all connections and apply a small positive
pressure to compensate for the vacuum that will develop as
the unit cools to room temperature. Internal water pressure
should be maintained at greater than atmospheric pressure.
Nitrogen often is used to pressurize the vessel.
The boiler water should be tested weekly as long as the unit
is in storage. Additional chemicals may be required to
prevent internal corrosion. If more chemicals are added, it is
desirable to circulate the boiler water for a short time by
means of an external pump.
Contact your local Cleaver-Brooks authorized representative
for water treatment chemicals or assistance.
Pressure Vessel Care
750-177