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 TB 740-97-4
APPENDIX F
DYNAMIC DEHUMIDIFICATION INSTRUCTIONS FOR
TUG, HARBOR, DIESEL, 600 HP,
STEEL, 65 FOOT, DESIGN 3004
1. General. This appendix provides detailed instructions for preparation of the harbor tug, design 3004, 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) Air whistle.
(b) Horn.
(c) All exterior lights with plug-type connections.
(2) Stores flat. The following items will be removed, identified, and stewed in the stores flat:
(a) All canvas covers.
(b) Rain shields.
(c) Falls and halyards.
(d) Stern quadrant gratings (wood).
(e) Pilothouse floor grating.
(f) Portable davit.
(3) Crew's quarters. The following items will be renewed, identified, and stowed in the crew's quarters.
(a) Salvage hose.
(b) Shower curtain and hooks.
(4) Fidley. The following items will be removed, identified, and stowed in the fidley:
(a) Life rafts.
(b) Life raft chocks and gripes.
(c) Jackstaff.
(d) Portlight screens.
(e) Monitor barrel.
(f) Monitor nozzles.
(g) Deck keys and dog wrenches (all).
(h) Sand shovel.
(i) Spanner wrenches for fire stations.
b. Preparation for Dynamic Dehumidification .
(1)
Dehumidified area. All areas of the craft, except the forepeak ballast tank, the boatswain's locker, the deck
and cleaning gear locker, the aft ballast tank, the hauser stores flat, and void areas aft of the engine room, will be prepared
for dynamic dehumidification. The anchor windlass will be included among the areas to be dehumidified. All areas being
dehumidified will be treated as a single zone.
(2)
Provisions for air circulation. Within the zone being dehumidified, all interior doors will be secured in an
open position. The galley range and refrigerator doors will be secured in an open position. Galley range smokepipe will be
removed and secured nearby. In the pilothouse, the cover will be removed from the aft face of the remote control stand
and secured nearby. Doors will be secured open, and cover sections loosened or removed from the switch which can be
ventilated without disturbing electrical connections. The damper on the aft face of the fan room will be turned to "summer
position." All other dampers in the ventilating system will be turned to open position. The cooling water pipe will be
detached at the stern tube connection, and the opening to the stern tube closed with a pipe plug. Clean-out covers or
plugs will be removed from the engine manifold and secured adjacent to the openings. The flexible connection will be
removed from the exhaust line and secured nearby. Connections to the air tank and the manually operated control valve
will be broken and left open for ventilation. All drain plugs in the control system will be removed, bagged, tagged, and
secured adjacent to their proper locations.
(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) Stack. All openings at the top of the stack will be masked with pressure-sensitive tape and sealed with
strippable coating and bituminous coating.
(b) Exhaust vents on fidley. All openings to covers of exhaust vents on the fidley will be sealed as specified for
the stack.
(c) Fidley. The stagger welds and gasketed joint around the fidley will be sealed with strippable coating and
bituminous coating.
(d) Skylights on fidley. The edges of the skylight glasses and frames will be sealed with strippable coating and
bituminous coating.
(e) Pilothouse. Edges of doors and windows (except the one used for introduction of dry air as
Change 2 F-1
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