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 TB 740-97-4
hatch opening. The blank will be provided with holes for the introduction of air ducts, a sensing element, and a humidistat
cable. A flexible hose, similar to that specified In (a) above, will be secured to the moist-air duct inside the hatch blank.
The hose will extend to the aft section of the compartment and will terminate approximately 3 feet from the stern bulkhead
in the compartment and no more than 18 inches from the floor plate. A humidistat similar to that specified In (a) above,
will be installed approximately 3 feet from the intake end of the flexible hose and approximately 3 feet above the floor
plates. A sensing element, similar to that specified in (a) above, will be installed. The element will be secured adjacent to
the electric wiring cabinet in the compartment, and the contact will be mounted in the hatch blank.
(e) Duct connections. Connections of air ducts to the dehumidification machine will be made by unions or slip
joint connections, which permit easy removal of the machine for servicing. (f) Ductwork supports. Ductwork run on deck
will be supported on wood or metal stanchions. The ducts will be secured to the stanchions by metal strapping.
(g) Humidistat installation. Humidistats will be mounted so that they are protected against movement or
damage. Rubber-covered electrical cable 3 with suitable terminal connectors, will be installed to connect the humidistats
to the dehumidification machines and to power lines. The manufacturer's instructions will be followed in making electrical
connections. Provision will be made to prevent movement of the cables at the points where they leave the dehumidified
zones.
(h) Sensing element installation. Sensing elements will extend into the dehumidified zones as far as is feasible.
They will be secured against movement and against contact with metal or other conducting surfaces.
M-4 Change 2
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