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 TB 740-97-4
welded to the deck around the windlass. The angle irons will be positioned with one face against the deck and the vertical
face toward the windlass. The size and shape of the coaming will be such that the sheet metal cover 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.
The cover will be provided with two holes, of sufficient size, to introduce the dry-air duct and the moist-air return duct and
one hole, of sufficient size, to mount a sensing element. Apertures between the coaming and the deck will be filled with
bituminous coating. All other joints and seams will be coated with strippable coating and bituminous coating.
(c) Skylight. The skylight will be closed, and the joint between the skylight hose and the movable sections will
be sealed with strippable coating and bituminous coating. The skylight glasses and frame will be sealed at the edges with
strippable coating and bituminous coating.
(d) Galley and engineroom accesses. The shading covers and doors to the galley and the engineroom will be
sealed with strippable coating and bituminous coating. The portlights in the engineroom and the galley casings, except
those used to introduce dehumidification ducts, will be sealed with strippable coating and bituminous coating. The
ventilators and the exhaust pipes will be blanked and sealed above the deck.
(e) Machinery house. The machinery house windows will be covered with blanks fabricated from exterior
grade plywood or galvanized sheet metal and sealed with strippable coating and bituminous coating. The access hatch on
the roof of the machinery house will also be sealed with strippable coating and bituminous coating. The cable openings in
the machinery house roof will be blanked and sealed with strippable coating and bituminous coating. One door to the
machinery house will be removed, and the opening covered with a blank fabricated from minimum 3/4-inch exterior grade
plywood or minimum No. 18 gage galvanized sheet metal. The blank will be sealed with strippable coating and
bituminous coating.
(f) Miscellaneous sealing. The lube oil overboard discharge line on top of the engineroom casing, the fuel oil
valve, the fuel tank vent, the fire pump receptacle, the shore power receptacle, the window drain holes, and openings
resulting from the removal of windshield wipers, lights, and other such items will be sealed with strippable coating and
bituminous coating.
(g) Sealing of dehumidification piping system. The connecting points of all air ducts to areas being
dehumidified will be sealed with strippable coating and bituminous coating. The sealing will be carried over and around
flanges, adapters, and other devices used to attach or introduce the ducts. All joints and seams in the ducts will be
similarly sealed.
(4) Dehumidification installation.
(a) Dehumidification system No. 1. A package dehumidifier, single desiccant bed, absorbent type, 10,000
cubic foot capacity, 110-volt, alternating-current, will be installed, generally, as shown on figure 44. The machine will be
mounted on a stand and protected with a cover, fabricated in accordance with figure 46. An extension, terminating in a 90
elbow will be fitted to the reactivation air outlet on the dehumidification machine in order to extend the outlet beyond the
exterior side of the sheet metal cover. The elbow will be turned away from the reactivation air inlet side and turned
downward 45to prevent the direct entry of water. Four-inch-diameter, No. 26 gage, galvanized sheet metal ducts, with
necessary ells, reducing fittings and connections, will be installed, generally, as shown on figure 44. A portlight on the
starboard side and one on the port side of the engineroom casing facing the stern will be secured in open position, and the
openings covered with blanks fabricated from exterior grade plywood or galvanized sheet metal. The blank for the port
side portlight will be provided with a hole of sufficient size to introduce the dry-air duct. The blank for the starboard side
portlight will be provided with three holes: One, of sufficient size, to introduce the moist-air return duct; another to permit
the passage of the humidistat cable; and the third to mount the sensing element contact. A flexible hose, conforming to
MIL-Spec H-8796, will be run from the moist-air return fitting in the starboard side blank and will terminate approximately 3
feet from the forward starboard engineroom bulkhead and no more than 18 inches above the engineroom deck. A
humidistat, electronic-type, will be set to maintain a 40-percent relative humidity, plus or minus 5 percent, within the
dehumidified area. The humidistat will be installed approximately 3 feet above the engineroom deck and at a distance
approximately 3 feet from the intake end of the flexible base. Two humidity sensing elements, with 6-foot cable, will be
installed in the engineroom. One will be installed in the aft section of the starboard engineroom. The contact will be
mounted in the blank used to introduce the moist-air return duct. The end portlight on the forward starboard side of the
engineroom casing will be secured in
M-2 Change 2
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