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 TB 740-97-4
(d) Duct No. 4. From the forward starboard engine room vent to the hand bilge pump port of the
starboard ramp cylinder compartment.
(e) Duct No. 5. From the hand bilge pump port of the portside ramp cylinder compartment to the
port tiller access.
(f) Duct No. 6. From the starboard tiller access to the port tiller access of the first craft.
(g) Duct No. 7. From the starboard tiller access to the moist air connection of the dehumidification
machine.
2. Craft stored side by side (fig. 10).
(a) Duct No. 1. From the dry air connection of the dehumidification machine to the aft port engine room
vent.
(b) Duct No. 2. From the forward, starboard, engine room vent to the hand bilge pump port of the
starboard ramp cylinder compartment.
(c) Duct No. 3. From the hand bilge pump port of the portside ramp cylinder compartment to the
starboard hand bilge pump port of the second craft.
(d) Duct No. 4. From the portside hand bilge pump port to the forward starboard engine room vent.
(e) Duct No. 5. From the aft port engine room vent to the port tiller access.
(f) Duct No. 6. From the starboard tiller access to the port tiller access of the first craft.
(g) Duct No. 7. From the starboard tiller access to the moist air connection of the dehumidification
machine.
(c) Ductwork supports. Ductwork run on deck will be supported on wood or metal stanchions. The ducts
will be fastened to the stanchions by galvanized strapping secured to the stanchions.
(d) Humidistat. A hair type humidistat will be set to maintain a 40 percent relative humidity, plus or
minus 5 percent, within the dehumidified area. The humidistat will be installed in the Lazaret of the craft on which the
dehumidification machine is mounted. The humidistat will be mounted and secured approximately 3 feet above the floor
plate level in the ladder leading from the Lazaret access hatch. The manufacturer's instructions will be followed in
making the electrical connections. The humidistat will be connected to the machine with a No. 18 two-conductor rubber-
covered cable with suitable terminal connectors.
(c) Humidity sensing elements. Humidity sensing elements will be installed as follows:
1. Lazaret. One sensing element with cable will be installed in the Lazaret of the craft on which the
humidistat is not mounted. The element contact will be mounted in the side of the air duct, just above the connection to
the compartment opening shown on figure 9 or 10. The element and the cable will be run down the inside of the duct and
supported clear of the end of the duct in a manner to secure it against motion and contact with metal or other conductive
surfaces.
2. Cab. A humidity sensing element without cable will be installed in cab of each craft. The
sensing element will be installed in the metal blanks covering the cab doorways.
C-3
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