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 TB 740-97-4
Passageway to the top deck will be left open. All doors leading into the radio chart room, pilothouse, sick bay, captain's, chief
engineer's, and radio operator's room will be secured In an open position.
(3) Sealing for dehumidification. Methods and materials used for sealing for dehumidification will be in accordance with this
bulletin. Detailed sealing requirements are as follows: All exterior doors, will be stripped with pressure-sensitive tape and sealed with
bituminous coating and strippable coating. All scuttles, exterior hatches, vents, louvers, stern tube coupling water connections will be
sealed with bituminous coating and strippable coating. The louvered sections and the openings at the top of the stack will be masked
with pressure sensitive tape and sealed with bituminous coating and strippable coating. The exhaust stack protruding from the stack
will be blanked and sealed with strippable coating and bituminous coating. Gooseneck and mushroom vents will be removed, the
opening blanked with exterior grade plywood for galvanized metal, and the perimeter sealed with bituminous coating and strippable
coating. Seal all openings, resulting from the removal of windshield wiper motors, horn, searchlights, and other such items, with
bituminous coating and strippable coating.
(4) Miscellaneous sealing. All openings that lead to dehumidified zones not specifically covered herein that would permit
the entry of water or moisture will be sealed and made watertight with strippable coating and bituminous coating.
(5) Windlass cover. A cover will be fabricated and installed over the anchor windlass, and blanked hawse pipe openings.
The cover will be fabricated from minimum No. 18 gauge galvanized sheet metal. All top and vertical edges will be reinforced by 1-x
1-x 1/8-inch-angle iron tack welded to the deck around the windlass. The angle irons will be positioned with one face toward the deck
and the vertical face toward the windlass. The size and shape of the coaming will be such that the sheet metal fits snugly over the
vertical faces. The cover will be fastened to the coaming by No. 12 sheet metal screws spaced approximately 2 feet apart. Apertures
between the coaming and the deck will be filled with bituminous coating. All Joints and seams will be sealed with strippable coating
and bituminous coating. Openings for the air ducts and sensing element will be provided.
(6) Dynamic dehumidification installation.
(a) Dehumidification machines. Eight package dehumidifiers, single desiccant bed, absorbent type, 10,000 cubic foot
capacity, 110-volt, alternating-current, will be installed. The machines, with covers and stands fabricated as shown in this bulletin will
be located in the zones indicated below:
1. Zone 1. One package dehumidifier will be located Just outside the dehumidified zone on the main deck of the
forecastle.
2. Zone 2. Two package dehumidifiers will be located on the main deck, starboard side, directly In front of
forecastle hatch. (See fig. 1 for multiple D/H systems).
3. Zone 3. One package dehumidifier will be located on main deck, starboard side, directly in front of pump room
hatch.
4. Zone 4. Four package dehumidifiers will be located on the blower compartments on the boat deck close to the
skylights. Two dehumidifiers will be mounted on the port side and two on the starboard side. (See fig. 1 for wiring diagram for
multiple D/H systems).
(b) Duct Installation. Four-inch-diameter, No. 26 gauge, galvanized tubing, with necessary ells, tees, reduced fittings
and connections, will be installed as required. Ductwork, when necessary, will be supported on 2-x4-inch wood stanchions. The
ducts will be fastened to the stanchions with galvanized strapping. Flexible ductwork, used within the dehumidified zones, will be
supported by wire, rope, or other suitable means.
1. Ducts to Zone 1. To permit the introduction of air ducts to the interior of the zone, openings have been
provided in the windlass cover. The dry-air lines will be introduced through the top opening of the windlass cover, and the moist-air
return line will be attached to the bottom opening of the cover.
2. Ducts to Zone 2. To permit introduction of air ducts to the interior of zone 2, the hatch on the starboard side of
the forecastle will be removed and stowed in the ammunition storage locker. The hatch opening will be covered with a blank
constructed of No. 18 gauge galvanized sheet metal with flanged holes for attaching the air ducts. The blanks will be secured to the
bulkhead with clips riveted to the blank, by tack welding to the corners, or by other suitable means. The dry-air lines will be
introduced through the top openings of the blank, and the moist-air return lines will be attached to the bottom opening of the blank.
Flexible tubing will be attached to the dry-air inlet and run to the forepeak tank.
Change 2
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