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 TB 740-97-4
open position and a blank, similar to those used to introduce the air ducts, will be installed over the opening. The blank
will be provided with a hole of sufficient size to mount a sensing element contract. The second sensing element will be
secured in the forward section of the port side engineroom, and the contact will be mounted in the portlight blank.
(d) Dehumidification system No. 2. A dehumidification machine and ductwork, similar to that specified In (a)
above, 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. The first portlight inboard of the starboard side In the forward end of the
galley casing, the portlight in the forward port side section of the casing, and the portlight in the after port side section of
the casing, will be secured in open position. Blanks, similar to those specified In (a) above, will be installed over the
openings. The blank in the starboard portlight will be provided with a hole sufficient to mount a sensing element contact.
A flexible hose, similar to that specified in (a) above, will be run from the moist air return duct, in the port side portlight,
down through the hatch to the storage space below the galley. The hose will terminate no more than 18 Inches above the
storage space deck. A sensing element will be installed in the side of the return air duct, approximately 6 inches outside
the blanked portlight. The hatch to the capstan machinery compartment will be secured in open position. A blank will be
fabricated from exterior grade plywood or galvanized sheet metal and secured over the hatch opening. The blank will be
provided with three holes: One for the air duct from the galley casing; the second for the return air duct to the windlass;
and the third for the passage of the humidistat cable. Flexible hose, similar to that specified In (a) above, will be
connected to the moist-air return fitting in the blank. The flexible hose will run from the blank and will terminate
approximately 3 feet from the forward bulkhead of the capstan machinery compartment and no more than 18 inches above
the floor plates. A humidistat, similar to that specified in (a) above, will be installed in the forward section of the capstan
machinery compartment. The humidistat will be secured against movement. The cable will run from the humidistat
through the hatch blank to the dehumidification machine. A sensing element, similar to those specified in (a), above will
be secured in the compartment. The sensing element contact will be mounted in the side of the return duct. Ductwork will
be run from the capstan machinery compartment hatch to the windlass cover. The dry air will be introduced at the forward
end of the cover, and the moist air will be withdrawn from the aft end. The moist-air return duct will run from the windlass
cover back to the dehumidification machine. A sensing element, similar to that installed in the duct between the galley
casing and the capstan machinery space hatch, will be installed in the windlass cover near the moist-air return fitting.
(c) Dehumidification System No. 3. Two dehumidification machines, similar to that specified in (a) above, will
be installed, generally, as shown on figure 45. The machine will be mounted on a stand and protected with a cover
fabricated, generally, in accordance with figure 46. The blank covering the machinery house doorways will be provided
with holes to introduce the dry-air ducts, the moist-air return ducts, a sensing element contact, and the humidistat cables.
Flexible hoses similar to that specified in (a) above, will be connected to the moist-air return fittings on the inside of the
blanked door. One hose will extend to within approximately 3 feet of the after bulkhead starboard side of the machinery
house and no more than 18 inches from the floor plates. The other will extend to within approximately 3 feet of the crane
cab and no more than 18 inches from the floor plates. Two humidistats, similar to that specified in (a) above, will be
installed in the machinery house. One will be located in the aft starboard corner of the machinery house and will be
secured approximately 3 feet above the floor plates. It will be connected to the dehumidification machine servicing the aft
end of the machinery house. The other humidistat will be located in the crane cab approximately 3 feet above the floor
plates and will be connected to the dehumidification machine servicing the forward section of the machinery house. Two
sensing elements, similar to those specified in (a) above, will be installed in the machinery house. One will be secured as
far forward as the cable permits and the other as far toward the aft section as the cable permits. The element contacts will
be mounted in the blank covering the doorway.
(d) Dehumidification system No. 4. A dehumidification machine, similar to that specified in (a) above, will be
installed, generally, as shown on figure 45. The machine will be mounted on a stand and protected with a cover
fabricated, generally, as shown on figure 46. The hatch cover to the stern capstan machinery compartment will be secured
in open position, and a blank, similar to that specified in (b) above, will be installed over the
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