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 TB 740-97-4
APPENDIX I
DYNAMIC DEHUMIDIFICATION INSTRUCTIONS FOR
BARGE, LIQUID CARGO, NONPROPELLED,
STEEL, 13,000 BARREL, 235 FEET,
DESIGN 7004
1.
General. This appendix provides detailed instructions for the preparation of the liquid cargo barge, design 7004, 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 davit.
(b) Windlass hand crank.
(c) Forward rake access cover.
(d) Light standards.
(e) Blank flanges.
(2) Engine house. The following items will be removed, identified, and stowed In the engine house:
(a) Fire axe.
(b) Fire extinguishers.
(c) Warning tag.
(d) Fog bell.
(e) Engine crank and spanner wrench.
(f) Rake bilge pumps.
(g) Navigational and signal lights.
(h) Ring life buoy.
(i) Rope.
(k) Cargo tank manhole covers.
(3) After rake compartment. The following items will be removed, identified, and stowed in the after rake compartment:
(a) Cargo hose, complete with fittings.
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 by a light timber
casing.
(b) Boat hook.
b. Preparation for Dynamic Dehumidification .
(1) Dehumidified area. The engine room and the eight cargo tanks will be prepared for dehumidification.
(2) Provisions for ventilation and air circulation .
(a) 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 located in each tank will be left open. Covers will be fabricated from No. 20 gauge galvanized sheet metal and installed
over the manholes. The covers will be form fitted over the exterior of hatch covering to permit sealing around the edges. Provisions
will be made in the sheet metal covers for entrance of dehumidification air ducts, cables for humidistats, and sensing elements as
required.
(b) Rake compartments. The forward and after rake compartment vent covers will be secured in an open position.
A cover fabricated from exterior grade plywood or minimum No. 18 gauge galvanized sheet metal will be secured over the opening
resulting from removal of the center access cover of the forward rake compartment. A hole will be provided in the blank of sufficient
size to receive a goose-neck vent fabricated from galvanized sheet metal or a marine type turbine ventilator approximately 10 inches
in diameter. The gooseneck vents will be turned downward 180and the exterior opening provided with a galvanized insert screen.
The edges of the blank will be sealed with strippable and bituminous coating.
(3) Sealing for dehumidification . Methods and materials used in sealing for dehumidification will be in accordance with
this bulletin. Detailed sealing requirements are outlined below.
(a)
Engine room vents. The engine vents located on the roof of the machinery house will be closed with blanks, caps,
plugs or pressure sensitive tape and sealed with strippable coating and bituminous coating.
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