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 TB 740-974
APPENDIX S
DYNAMIC DEHUMIDIFICATION INSTRUCTIONS FOR
BOAT, PASSENGER AND CARGO
DIESEL, STEEL, 65-FOOT, 6-INCH
DESIGN 2001
1. General. This appendix provides detailed instructions for the preparation of the passenger and cargo boat, design
2001, for dynamic dehumidification.
2. Preparation Instructions. a. Disassembly and Stowage.
(1) Pilothouse. The following items will be removed, identified, and stowed in the pilothouse:
(a) Windshield wiper.
(b) Pilothouse ventilator screens.
(2) Lazarette. The following items will be removed, identified, and stowed in the lazarette:
(a) Navigation lights.
(b) Searchlights.
(c) Cargo floodlights.
(d) Blinker light.
(e) Horn.
(f) Canvas covers (all).
(g) Handwheel and dogging mechanism (cargo hold access scuttle).
(h) Anchor and lifeboat falls.
(i) Toggle pins and chains for railing and staffs.
(j) Lifelines and stanchions.
(k) Running rigging and halyards.
(m) Towing trolley, tiller access plate and lubricating oil vent screen.
(3) Passenger quarters. The following items will be removed, identified and stowed in the passenger quarters:
(a) Cargo hatch battens (wood).
(b) Cargo hatch wedges and chains.
(4) Cargo hold. The following items will be removed, identified, and stowed in the cargo hold:
(a) Lifeboat.
(b) Life rafts.
(c) Lifeboat chocks and gripes.
(d) Life raft chocks and gripes.
(e) Lifeboat davits, except those with welded cleats.
(f) Anchor davit.
(g) Jackstaff.
(h) Scuttle and deck plate key.
(i) Forepeak and cargo hold scuttle cover and strongback
(5) Engineroom. The cargo winch engine and sprocket chains will be removed, identified, and stowed in the
engineroom.
(6) Chain locker. The anchor chains will be disassembled from the anchors and stowed In the chain locker.
b. Preparation for Dynamic Dehumidification.
(1) Dehumidified area. The engineroom, pilothouse, main deckhouse, lazarette, and crew's quarters will be prepared
for dynamic dehumidification.
(2) Ventilated spaces. Ventilation will be provided for the forepeak and cargo hold access scuttles. A 6-inch-high,
No. 12 gage, galvanized sheet metal coaming will be fabricated and installed in the recess around the scuttle opening.
The diameter of the coaming will be approximately equal to the major diameter of recess. The coaming will be bedded on
bituminous coating in the recess, and additional bituminous coating will be applied, in the form of a fillet, around the
outside junction of the coaming and the deck. A ventilated shelter, painted as specified herein, will be fabricated and
installed over each of the open scuttles. The shelters will be fabricated of nominal 1-inch lumber, or 2-to 5/8-inch,
exterior-type plywood, grade A/C, and will include the features shown on figure 65. The louvered face will be covered with
standard, aluminum, insect screen. The shelter for the hatch scuttle will be of sufficient size to contain the scuttle and the
cover in open position. The shelters will be secured by wiring to convenient points such as vent pipes.
(3) Waterproofing of cargo hatch. The cargo hatch will be covered with 30-pound roofing paper. Joints will be
overlapped 6 inches and made tight with
Change 2
S-1
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