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 TB 740-97-4
duct will be run from this line to the flanged hole in the blank covering the portside passage area doorway.
2. Ducts to zone 2. To permit circulation of air within zone 2, the hatch cover will be removed from
the hatch opening to the messroom, and the window will be removed from the starboard door of the pilothouse. The
resultant openings will be covered with ferrous metal blanks constructed and equipped with fittings in accordance with
figure 16. A dry air duct will be run from the dehumidification machine to the short fitting on the blank applied over the
messroom hatch. A branch duct will be run to a fitting in the plate attached to the window opening in the pilot house
door. A connecting duct will be run, from the other fitting in the plate, to an opening in the anchor winch cover. A return
moist air duct will be run from the anchor winch cover and will be joined by a connection to a return line running from the
long fitting in the hatch cover plate to the dehumidification machine. Two lengths of flexible tubing of 4 inch inner
diameter will be attached to the Y-fitting on the underside of the hatch cover plate. One length of the flexible tubing will
extend downward into the port generator room. The other length will extend downward into the starboard generator
room.
(c) Humidistats. A hair type humidistat will be set to maintain a 40 percent relative humidity, plus or
minus 5 percent, within each zone being dehumidified. The humidistats will be wired to the dehumidification machines
by means of No. 18, two conductor, rubber-covered cables. The humidistat in zone 1 will be secured approximately 3
feet above the deck on the outboard bulkhead of the storeroom from which the return air duct is run to the
dehumidification machine. The humidistat in zone 2 will be secured in the starboard engine room, near the access to the
starboard generator room, approximately 3 feet above the deck.
(d) Sensing elements. In zone 1, humidity sensing elements without cable will be installed in the sheet
metal blanks used to cover the doorways to the storeroom and passage area on the starboard side of the craft. In zone
2, humidity sensing elements without cable will be installed in the port side of the winch cover and in the cover over the
natural exhaust opening in the well deck bulkhead under the poop deck. A humidity sensing element with 6 foot cable
will be installed in the pilot house. The mounting assembly will be installed in the blank over the window in the starboard
door and the element will be suspended near the wheel.
(5) Ventilation of spaces not under dehumidification. Provision will be made for ventilation of all spaces
not under dehumidification. The door between compartments in the hold, all manholes and handhole covers will be
secured in open position. Existing ventilators and vent pipes will be left open. Where deck plates or accesses are used
to furnish ventilation, they will be fitted with covers to permit entry of air but to exclude direct entry of water. Galvanized
gooseneck vents will be fitted to deck plates and other small openings. All vents will be provided with insect screens.
D-3
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