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 TB 740-97-4
sealed with strippable coating and bituminous coating.
(g) Maniholes. Manholes to the forepeak and lazaret will be sealed with strippable coating and bituminous
coating.
(h) Hawse pipe hole and windlass mounting holes. The hole through which the anchor rope is fed into the rope
locker, and the tapped holes for windlass mounting screws will be masked with pressure-sensitive tape and sealed with
strippable coating and bituminous coating.
(i) Miscellaneous sealing. Window drain holes and openings resulting from removal of windshield wipers,
horn, and searchlight will be masked with pressure-sensitive tape and sealed with strippable coating and bituminous
coating.
(j) Dehumidification piping system. The connecting points of all air tubing or ducts to areas being dehumidified
will be sealed with strippable coating and bituminous coating. The sealing will be carried over and around flanges,
adapters, and other devices used to attach or introduce the tubing or ducts. All joints in the tubing and ducts will be
similarly sealed.
(k) Fuel oil valve extension rods. Fuel oil emergency shutoff extension rods, which project through the deck,
will be turned to full open position and the rod and adjacent deck will be coated with strippable coating.
(4) Dehumidification installation.
(a) Dehumidification machine. A package dehumidifier, single desiccant bed, absorbent type, 10,000 cubic feet
capacity, 110-volt, ac, will be installed as shown on figure 17. The machine will be mounted on a stand and protected with
a cover fabricated in accordance with figure 18. One machine will service two tugs.
(b) Duct installation for dry storage. Four-inch diameter No. 26 gage, galvanized tubing, with necessary ells,
reducing fittings, and connections, will be installed generally as shown on figure 17. Blanks of galvanized metal or of -
inch thick exterior grade plywood will be used for joining the duct work to the port lights. The blanks will have suitable
holes for insertion of the ducts. Holes for mounting sensing element assemblies and for insertion of the humidistat cable
will also be provided as shown on figure 17. The blanks will be secured with sufficient hook bolts to hold them snug
against the portlight frames.
(c) Duct installation for wet storage. For wet storage, the duct installation will be the same as specified for dry
storage except that the connecting ducts between tugs will be flexible hose and the hose will be at least 4 feet longer than
the distance between terminal connections.
(d) Duct extension. Flexible hose will be used to extend the ducts into the crew quarters of the tug, on which
the dehumidification machine is mounted, and into the engine room of the other tug serviced by the dehumidification
machine, as indicated on figure 17. The flexible hose will extend to within approximately 2 feet of the deck of the
compartment in which it is placed.
(e) Machine connections. Connection of ducts to the dehumidification machine will be made with unions or
slip joint connections which permit easy removal of the machine for servicing.
(f) Humidistat. A hair type humidistat will be installed in the engine room of the tug remotely serviced by the
dehumidification machine as shown in figure 17. The humidistat will be attached approximately 3 feet above floor plate
level to the stanchion located approximately 6 feet forward of the aft bulkhead on the port side of the tug. The humidistat
will be wired to the dehumidification machine with No. 18 2-conductor rubber-covered cable with suitable terminal
connectors.
(g) Sensing elements. Humidity sensing elements will be installed as follows:
1.
Engine room. A humidity sensing element with 6 foot cable will be mounted in each blank used to
connect the duct work to the portlights of the engine room. The element and cable will be extended into the engine room
and secured approximately 2 feet above the engine room floor.
2. Pilothouse. A humidity sensing element, without cable, will be installed in the pilothouse door of each tug,
as shown on figure 17. Mounting will be accomplished by removing one dog at the center of the hinged side of each door
and mounting the element in the hole.
Change 2 E-2
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