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 TB 740-97-4
APPENDIX O
DYNAMIC DEHUMIDIFICATION INSTRUCTIONS FOR
BARGE, REFRIGERATED CARGO,
NONPROPELLED, STEEL, 14,200 CUBIC FOOT
CAPACITY, 120-FOOT, DESIGN 7010
1. General. This appendix provides detailed instructions for preparation of the refrigerated cargo barge, design 7010, for dynamic
dehumidification.
2. Preparation Instructions. a. Disassembly and Stowage.
(1) Engineroom. The following items will be removed, identified, and stowed in the engineroom:
(a) Rope, blocks, and tackle (anchor davit).
(b) Navigation lights and stanchions.
(c) Fire hose.
(d) Toggle pins and chains.
(e) Portable water hose.
(f) Bell.
(g) Canvas covers.
(h) Fire line discharge valve bonnets.
(i) Engineroom hatch cover.
(2)
Starboard storage compartment. The following items will be removed, identified, and stowed in the starboard storage
compartment.
(a) Anchor davit.
(b) Anchor cable stopper.
(c) Rake and access hatch covers.
(3) Anchors. The anchors will be detached from the anchor cables and stowed on deck. They will be secured by use of existing
anchor stowage fittings.
(4) Dehydrators. All dehydrating elements (line dryers) will be removed and discarded. Cover plates will be replaced over the
dryer container, and each system involved will be purged of air.
(5) Exhaust system. The flexible section will be removed from each exhaust system and secured adjacent to its place of use.
The clean-out plugs will be removed from the manifolds and secured adjacent to the openings. Soot cans will be cleaned and
secured to the air silencer.
(6) Hydraulic governors. The housing cover will be removed and secured to the governors in other than operation position.
(7) Anchor davit socket. The anchor davit socket opening will be coated with type P-2 preservative and sealed against the entry
of water, using caps, plugs or tape and strippable compound.
b. Preparation for dynamic dehumidification.
(1) Dehumidification area. The two enginerooms and stack and the four refrigerated compartments and vestibules will be
prepared for dynamic dehumidification.
(2) Provisions for air circulation and moisture diffusion. To permit circulation of air within the dehumidified zones, all
doors within the enginerooms, including panel doors, cabinet doors, and doors of similar items, will be secured in open position. The
interior refrigerator doors, including the vestibule doors within the refrigeration compartment, will be secured in an open position to
permit circulation of air.
(3) Sealing for dehumidification. Materials and methods used in sealing for dehumidification will be in accordance with
this bulletin. Detailed sealing requirements are outlined below:
(a) Engineroom access hatches. The opening, resulting from the removal of either the port or starboard
engineroom access hatch cover, will be blanked with galvanized sheet metal or 1/2-inch exterior grade plywood blank provided with
holes, of sufficient size for introducing dehumidification ductwork sensing elements and humidistat cable. The removed engineroom
access hatch cover will be stowed in the engineroom. The blank and the remaining engineroom access hatch cover will be sealed at
the edges with strippable coating and bituminous coating troweled into the aperture between the coaming and the closed cover and
blank.
(b) Refrigerator compartments. Each cargo hatch cover will be raised to a sufficient height, to permit introducing
dehumidification ductwork. Each hatch cover will be supported by three rows of 4-x4-inch timbers placed across the short dimen-
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