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 TB 740-97-4
APPENDIX G
DYNAMIC DEHUMIDIFICATION INSTRUCTIONS FOR
TUG, HARBOR, DIESEL, 1,200 HP,
STEEL, 100 FOOT, DESIGN 3006
1. General. This appendix provides detailed instructions for preparation of the harbor tug, design 3006, 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) Pelorus stand.
(b) Blinker light and key.
(c) Rudder angle indicator.
(d) Jackstaff and anchor light staff.
(e) Ships bell and bracket.
(f) Windshield wipers.
(g) Navigation lights.
(h) Searchlight.
(i) Halyards.
(j) Horn, air whistle and lanyard.
(k) Main deck fire station valves and fittings.
(l) Skylight glass (1).
(2) Crew quarters. The following items will be removed, identified, and stowed in the crew quarters:
(a) All canvas covers, curtains, and dodgers.
(b) Lifeboat falls and equipment.
(d) Fire monitors and valves.
(e) Salvage hose.
(f) Gratings from aft end of main deck.
(3) Lifeboat. The lifeboat will be inverted and stowed on supports of sufficient height to hold the boat clear of
the deck. The supports will be distributed to minimize stresses on the boat. The gripes %vill be used to hold the lifeboat in
position.
b. Preparation for Dynamic Dehumidification .
(1) Dehumidified area. The entire interior of the tug will be prepared for dynamic dehumidification.
(2) Provisions for air circulation. To permit maximum circulation of air within the dehumidified zone, all interior
doors, including the door from the engine room to the shaft alley, cabinet doors, panel and controller doors, refrigerator
doors and doors on similar items, will be secured in open position. All manhole covers will be removed and secured in
other than normal position. The engine room escape hatch and the hatch between the stores compartment and the shaft
alley will be secured in open position. Valves in the bilge suction line, from all tanks, voids, and compartments and the
bilge manifold valves will be opened. Ventilation systems will be in open position. The cover of the hydraulic ram will be
provided with two holes of sufficient size for introducing dehumidification ductwork. If the cover has been provided with
inspection accesses, they will be used instead of cutting new holes. Piping will be disconnected at the air starting tank and
at the air valves. All air valves will be left in open position. The drain plugs and inspection plates will be removed from the
exhaust manifold and secured adjacent to the openings. Soot pots will be removed, cleaned, and secured adjacent to
places of removal. The inspection plate on the galley range smokepipe, passing through the engine room casing, will be
removed and secured to the smokepipe.
(3) Sealing for dehumidification . Methods and materials used in sealing for dehumidification will be in
accordance with this bulletin. Detailed sealing requirements are as follows:
(a) Crew quarters scuttle. The scuttle to the quarters will be sealed by troweling bituminous coating into the
aperture between the coaming and the closed cover. The recess in the cover will be masked with pressure-sensitive tape
and sealed with strippable coating and bituminous coating.
(b) Davit winch. The opening at the top of the slewing bearing will be sealed with strippable and bituminous
coating to prevent infiltration of water.
(c) Capstan and windlass controls. All openings on the capstan and windlass control boxes will be sealed with
strippable coating and bituminous coating. The Joints between the control pedestals
Change 2 G-1
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