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 TB 740-97-4
Detailed sealing requirements are as follows: All exterior doors, except the one designated for entry for inspection and RH readings,
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 openings blanked with plywood or 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, as specified, 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-
x1-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. If no openings exists, i.e., manhole or hatch, to permit circulation of dry air to the windlass, ingress
will be made as indicated in the enclosed BUSHIPS drawing.
(6) Dehumidification installation .
(a) Dehumidification machine . A rotary desiccant, electrical dehumidifier, solid (wheel) type 20-153, 150,000 cubic foot
capacity, 440volt, three-phase, 60-cycle, alternating-current, will be installed, generally, as shown in figure 70. (BUSHIPS Dwg
Y0113-S3803-B929 49 ALT. 3). The machine will be mounted outside the dehumidified zone on the weather deck to permit ease of
servicing. The machine will be fitted with a cover to protect it from the weather.
(b) Duct installation. The vessel's fire main will be used as the source for the dry-air supply to the dehumidified zones,
as shown in the enclosed drawing, figure 70, and as specified herein.
1. Where the fire main terminates at the bulkhead of the forecastle, an elbow and pipe of the same dimensions
will be added to the fire main valves and carried through into the bulkhead, into the forecastle lockers, to the port side of the resistor
bank.
2. Ingress into the bulkhead will be large enough to accommodate both the dry-air supply and the moist-air return
line back to the dehumidification machine. The union of the freshwater line supplying the forepeak tank on the port side inside the
forecastle locker will be disconnected, and the cover removed to permit entry of flexible hose to service the area (forepeak tank)
below the forecastle deck locker. The chain locker manhole covers will be opened to permit circulation of dry air to the chain locker.
3. The manhole cover in the pumphouse will be removed and fire main beneath the pumphouse void will be
disconnected to permit circulation of dry air into the pump room.
4. A flexible hose will be used for the moist-air pickup and return to
the dehumidification machine. The portlight in the hatchway will be removed and fitted with a plywood or sheet metal blank to permit
ingress of moist-air return line from dehumidification machine into the pumproom.
5. All unions and joints in the engineroom fire main will be disconnected and fitted with tees and/or valves to
permit circulation of dry air to the engineroom and machinery casing.
6. The fire main valve in the aft reefer section (main deck) will be left open to permit circulation of dry air to main
deck cabins and pilot house. The voice tubes will be left open from bridge to lower cabin areas to permit circulation of dry air.
7. A flexible hose for moist-air pickup will be installed at the lowest point in the engineroom and will extend back
to the return air connection at the dehumidification machine located in the weather deck. The fire valve on the aft end of the boat will
be closed or capped.
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