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 TB 55-1900-231-15
III.
DYNAMIC DEHUMIDIFICATION:
A.
Dehumidifiers
1.
Each ROWPU Barge has two (2) Honeycombe Cargoaier Model HC 150 dehumidifiers installed inside
the ROWPU deck just forward to the midships access door.
2.
Each machine has the capacity of processing 125 to 150 CFM and removing 2-3 lbs. of moisture from
the air per hour.
3.
The machines are designed to run for a minimum of five (5) years without any appreciable
maintenance problems.
4.
A copy of the technical manual for the machines is stored with ROWPU Technical Manuals.
B.
Dehumidification Plan: The dehumidification plan for the ROWPUIS is as follows:
1.
Machine Installation: As stated above, each ROWPU Barge has two (2) machines installed in the
ROWPU space, one on the port side and one on the starboard side just forward of the midship access
door. The machines are mounted on the bulkhead just aft of vent fans 7 and 8 respectively.
2.
Ducting and Air Supply
(a)
The dry (dehumidified air) is supplied from the outside through the dehumidifiers from a vent on
the outside bulkhead then through the vessel's ventilation system.
(b)
The moist air is vented to the outside from the machine through a vent pipe which passes
through the bulkhead approximately 18 inches above the deck.
(c)
The dry air is circulated throughout the vessel by passing through the vessel's ventilation system
and care must be exercised to ensure that all dampers in the ventilation system and all interior
doors and hatches within the vessel are open to permit the free passage of the air.
3.
Activation and Reprocessing. It should not be necessary to remove any of the ducting during the
activation of the craft; however, the following steps must be taken to prevent damage or contamination
of the system.
(a)
Disconnect the flex hose ducting from the vent system.
Blank off opening with a suitable
material and tie down the flex hose.
(b)
Turn off power to the machines and tag switches to prevent them from being turned on.
(c)
Blank off the intake and cap off the outlet on the outer bulkhead.
(d)
To reprocess, reverse the procedure and turn on power to the machines.
C.
Humidistats and Sensing Elements. The installation of the humidistats and sensing elements is as follows:
1.
Humidistats: The humidistats are set to maintain 40 percent relative humidity throughout the
dehumidification zone and control the dehumidification machines run time for moisture removal One
(1) humidistat is connected to each machine and is located in the lower level in Void #4 for the port
side and Void #2 for the starboard side with the opening to the machines.
E-13
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