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 TB 740-97-4
APPENDIX H
DYNAMIC DEHUMIDIFICATION INSTRUCTIONS FOR
BARGE, DECK OR LIQUID CARGO,
NONPROPELLED, STEEL,578-TONS OR
4,160 BARRELS, 120 FEET, DESIGN 231B
1.
General. This appendix provides detailed instructions for preparation of the cargo barge, design 231B, for dynamic
dehumidification.
2.
Preparation Instructions. a. Disassembly and Stowage.
(1) Forward rake compartment. The following items will be removed, identified, and stowed in the forward rake
compartment:
(a) Anchor cable, stopper, and shackles.
(b) Windlass hand cranks.
(c) Towing bridles.
(d) Docking plug wrenches.
(e) Loading light masts.
(f) Navigational and anchor light standards.
(g) Anchor davit.
(h) Spare cable reel.
(i) Safety rail stanchions and chains.
(2) Engine room. The following items will be removed, identified, and stowed in the engine room:
(a) Anchor davit and cargo mast topping falls and blocks.
(b) Fog bell.
(c) Engine crank and spanner wrench.
(d) Fuel tank filling funnel.
(e) Rake bilge pumps.
(f) Anchor cable fairlead rollers and roller pins.
(g) Navigation lights.
(h) Flexible exhaust piping.
(i) Life rings and lines.
(j) Pressure vacuum relief valves.
(k) Cargo tank manhole covers.
(3) Cargo hose. The cargo hose, complete with all fittings, will be stowed in the after rake compartment.
NOTE
The cargo hose, complete with all fittings, may be stowed on the main deck when stowage in the after rake
compartment is not feasible. When stowed on deck, the hose will be laid straight and protected with a light timber
casing.
(4) Cargo boom. The boom will be lowered and secured with the bitter end resting on deck.
b. Preparation for Dynamic Dehumidification .
(1) Dehumidified area. The engine room and the six cargo tanks will be prepared for dehumidification.
(2) Provisions for ventilation and air circulation.
(a) Anchor windlass cover. A ventilated, demountable cover will be fabricated and installed over the windlass. The
sides and ends will be fabricated generally as shown on figure 29 and shall be painted as specified herein. To facilitate disassembly,
the sides and ends will be fastened to each other with galvanized hooks and eyes. A minimum of two fasteners will be used at each
junction of a side and end. A roof, fabricated from minimum No. 20 gauge galvanized sheet metal, will be fitted over the sides and
ends and will overlap approximately 2 inches. Two lengths of minimum No. 12 gauge black annealed wire, positioned approximately
one-third the length of the cover from each end, will be secured to screw eyes located in the sides of the cover. The cover will be
secured by wiring to convenient points.
(b) Rake bilge pump pipe openings. Gooseneck vents will be fabricated from galvanized sheet metal and installed
over the pipe openings resulting from removal of bilge pumps. The exterior terminus of the vents will be covered with galvanized
metal insect screens.
(c) Cargo tanks. The tanks will be closed off and isolated by closing the suction, discharge and by pass valves at
the cargo pump. Tag each of these valves with a waterproof tag clearly marked "DO NOT OPEN THIS VALVE." The filling and
suction line valves located in each tank will be left in an open position. Covers will be fabricated from No. 20 gauge galvanized sheet
metal and installed over the manholes.
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