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 TB 740-97-4
(h) Ductwork supports. Ductwork run on deck will be supported by wood or metal stanchions. The ducts will
be secured to the stanchions with metal strapping.
(i) Humidistats. Humidistats, one for each dehumidification machine, electronic type, will be set to maintain a
40 percent relative humidity, plus or minus 5 percent, within each dehumidified zone. The humidistats will be installed
approximately 3 feet from the intake end of the moist air return line. The humidistats will be mounted so that they are
protected against movement or damage. Rubber covered electrical cable with suitable terminal connectors will be installed
to connect the humidistats to the dehumidification machines. The manufacturer's instructions will be followed in making
electrical connections. Provisions will be made to prevent movement of the cables at the points where they leave the
dehumidified area. The humidistats will be installed as follows:
For dehumidification machine No. 1, the humidistat will be installed in the crew quarters. The cable will pass
through the manhole on the bulkhead between the crew quarters and the chain locker, up the chain pipe, and through the
windlass cover, to the dehumidification machine;
For dehumidification machine No. 2, the humidistat will be secured to the forward side of the main switchboard in
the engine room. The fire line to the portside fire station will be disconnected at the first flange below the main deck. The
cable will run from the humidistat, up through the portside fire station blank, to the dehumidification machine;
For dehumidification machine No. 3, the humidistat will be secured on the starboard side of the stores area. The
cable will run through the blank over the stores hatch to the dehumidification machine.
(j) Sensing elements. Three humidity sensing elements with 6-foot cables and two humidity sensing elements
without cable will be installed as follows:
One sensing element without cable will be installed in the windlass cover. A portlight in the crew's washroom will
be secured in open position and a blank will be installed. The blank will be provided with a hole of sufficient size to mount
a sensing element;
A sensing element without cable will be mounted in the blank. The fire line to the starboard fire station will be
disconnected at the first flange below the main deck;
A sensing element with cable will be secured in the portside of the stores area. The contact will be mounted in the
blank over the stores hatch and will be shielded to prevent the entry of water into the contact fittings;
For first flight vessels with hydraulic steering ram, a sensing element with cable will be secured in the afterpeak
and the contact mounted in the afterpeak hatch blank. This sensing element will be omitted on second flight vessels.
Change 2 G-4
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