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 TB 740-97-4
to constitute-the total area to be dehumidified by a single dehumidification system. It is evident .that a zone may consist of a series
of compartments, tanks, and void spaces, either within one vessel or a, group of vessels. The total volume within a single zone must
not exceed the capacity of the dehumidification machinery. The nominal capacities of dehumidification machines are not absolute
criteria of volumes which they can service, since the loads imposed upon them vary, not only with volume of air but also with the
effectiveness of the sealing of the zone. Discretion must be used in deciding the extent of which a vessel is to be dehumidified.
Inclusion or exclusion of void spaces, empty storerooms, and other marginal areas should be determined after consideration of
machine capacity, amount of additional ductwork, and difficulty in excluding the questionable area from the zone. In general, where
such areas constitute a small part of the total volume of the vessel, they should be included in the dehumidification system.
Conversely, when such areas constitute a major part of the vessel and the dehumidification, would require use of additional
machines, they should be excluded from the areas to be dehumidified.
141. Preparation of Zone. a. It is essential that all water be removed from bilges, voids, tanks, piping systems, pumps, boilers,
and heating units within areas to be dehumidified. Failure to remove all water increases greatly the load upon the dehumidification
machine and my result in corrosion damage. All fuel and lubricating oil will be removed except for oil left in housing for purposes of
preservation.
b. Air circulation and water vapor diffusion within the zone will be encouraged by opening doors and hinged covers, removal of
manhole and handhole covers, opening dampers in ventilators, opening valves, disconnection or removal of hoses and flexible
connections in piping and shifting removable deck boards and deck plates.
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