21
Long Term Storage Procedures
Instructions for protection of non-operating equipment for more than 3 months.
After installation of the fluid cooler and completion of the pre-startup instruc-
tions, the operational availability of equipment will last for a maximum period
of three months. Ensure that the fluid cooler and coil are completely drained
of all water and process fluid.
After this initial period of 3 months, or until the unit is employed into continu-
ous operation, the fan shaft should be turned by hand for a few minutes every
month thereafter.
General Protective Requirements for Fluid Coolers:
The fan opening at the top of the fluid cooler should be covered with a tarp.
This will protect the mechanical components from rain as well as keep out
dirt, trash, leaves, etc.
All coils on every fluid cooler model are protected from the environment by the
structure of the fluid cooler as well as the PVC air inlet louvers. No external
protection of the coil is required for long-term storage.
For those units equipped with dampers, the blades of the dampers should be
kept in closed position. Damper actuators should be removed and stored in a
dry location to prevent condensation buildup inside the actuator.
Internal Protection of Coil
All of the coil inlet and outlet connections should
be sealed off with blind flanges. One flange per coil should be fitted with a
valve, pressure gage and blocking plug. The coils should be charged with
nitrogen gas to prevent corrosion. Connect a nitrogen supply line to the blind
flange with valve. Loosen the bolts at one of the inlet nozzle blind flanges to let
air escape. Inject inert gas into coil so as to effect nitrogen flushing for about
10 minutes and thus to expel all air out of the unit. Finally, re-tighten the inlet
nozzle blind flange bolts and let nitrogen pressure build up to 7 psig inside
the tube-bundle. Disconnect the nitrogen line and plug the isolation valve to
avoid any pressure drop in case of valve leak.
Mechanical Equipment:
Electric Motors: All drive motors should be taken down and stored indoors.
Then, every month, turn motor shafts to evenly distribute lubricant to the
bearing parts.
Recirculation pumps:
All pumps and pump motors should be taken down
and stored indoors (pumps and motors may be stored fully assembled). Then,
every month, turn pump impeller shaft to evenly distribute lubricant to the
bearing parts.
maintenance
