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 TB 740-97-4
bituminous coating.
(f) Cargo deck drain wells. Adapters will be installed in the openings resulting from removal of docking
plugs between frames No. 27 and 31. Lengths of rubber hose will be connected to the adapters and the cargo well drain
piping at the couplings In the ramp cylinder compartment to permit draining through the hull exterior.
(g) Ramp cylinder compartment. The points at which the ramp cables enter the pipes at the forward
bulkhead of the compartment will be sealed with strippable coating. Blanks fabricated from No. 20 gage galvanized
sheet metal will be installed over the openings resulting from removal of the hand bilge pump access plates. The blanks
will be provided with holes of sufficient size to permit the entry of the dehumidification system
air ducts.
(h) Tiller deckplates. The openings resulting from removal of tiller deckplates will be covered with
blanks fabricated from No. 20 gage galvanized sheet metal or /4-lnch plywood. The blanks will be provided with holes of
sufficient size to permit the entry of the air ducts. The blank covering the tiller access used for the moist air return to the
dehumidification machine (fig 9 or 10) will also be provided with a hole for the passage of the humidistat cable.
(i) Hull penetrations. Openings through the starboard side and port side of the hull and all drains in the
bottom, except those specified in (2) above, will be closed with blanks, plugs or pressure-sensitive tape and then sealed
with strippable coating and bituminous coating.
(j) Dehumidification piping system. The points of entry of all air ducts into compartments will be sealed
with strippable coating and bituminous coating. The sealing will be carried over and around flanges, adap rs and other
te
devices used to attach or Introduce the ducts. All joints in the ductwork will be similarly sealed.
(k) Propellers and shafts. Using strippable coating a seal will be applied around the propeller shaft at
the stern tube, at both ends of the strut bearing, at the propeller, and over the propeller shaft nut.
(I) Rudder mountings. The rudder post bearing areas outside the hull will be sealed with strippable
coating.
(m) Ramp. The ramp gate will be secured in closed position to remove torsional stress from the rubber
hinges. For drainage and to prevent crushing the ramp gasket, a slight opening is necessary. Supports, under the base
of the ramp, will be provided to relieve the hinges of all or part of the weight of the ramp. All openings in the ramp,
except those along the hinged edge, will be masked with pressure-sensitive tape and coated with strippable coating and
bituminous coating.
(n) Ramp gasket. The area between the free edge of the gasket and the hull will be coated with
strippable coating.
(o) Ramp hinges. The exposed rubber surfaces of the ramp hinges will be coated with strippable
coating.
(p) Deleted.
(4) Dynamic dehumidification installation.
(a) Machine installation . A package dehumidifier single desiccant bed, absorbent type, 10,000 cubic feet
capacity, 110-volt, alternating current will be installed as shown on figure 9 or 10. The machine will be mounted on a
stand and protected with a cover fabricated In accordance with figure 11. Normally the number of landing craft per
dehumidification machine will be two. Figure 9 shows craft stored stern to stern. Figure 10 shows craft stored side by
side. Connections of ducts to the dehumidification machine will be made by unions or slip joint connections which permit
easy removal of the machine for servicing.
(b) Air duct. Galvanized ducts, No. 25 gage, with necessary fittings, supports and connections will be
installed. Ducts will run with a minimum of bends and approximately as shown on figure 9 or 10. The ducting will be as
follows:
1. Craft stored stern to stern (fig. 9).
(a) Duct No. 1. From the dry air connection of the dehumidification machine to the hand bilge pump
port of the starboard ramp cylinder compartment.
(b) Duct No. 2. From the hand bilge pump port of the portside ramp cylinder compartment to the
forward port engine room vent.
(c) Duct No. 3. From the aft starboard engine room vent to the aft port engine room vent of the second
craft.
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