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 TB 740-97-4
capacity, 110-volt, alternating-current, will be installed on the aft deck, port side, as shown on figure 42. The machines will
be mounted on a stand and protected with a cover, fabricated, generally, in accordance with figure 43. Four-inch, No. 26
gage, galvanized tubing will be installed, leading from the dehumidification machines into plates over the No. 3 and No. 4
engines radiator access holes to vent petcocks. The inspection plates (No. 38-3 and No. 38-4) to the two radiators will be
removed, and two flexible 4-inch-diameter hoses, one through each inspection plate opening, will be extended to the
farthest point on the port side aft of the lighter. The manhole plate between the aft compartment and the machinery
compartment on the starboard side aft will be removed and secured adjacent to place of use. The manhole plate between
the machinery compartment and bilge pump compartment on the starboard side forward will be removed and secured
adjacent to place of use. Two, 4-inch-diameter, No. 26 gage, galvanized tubings will be installed in the blanks over the
lifting eyes in the cargo well, as shown on figure 42. The tubings will run from starboard side to port side of the lighter.
Four-inch-diameter flexible hoses leading from the cargo well blanks will be extended to the farthest point forward on both
sides of the lighter. The manhole plate between port machinery and bilge pump compartments will be removed and
secured adjacent to place of use. Two, 4-inchdiameter, No. 26 gage, galvanized tubings will be installed in the blank over
the engine compartment vent forward of the operator's cab as shown on figure 42. The tubings will run from the blank to
the dehumidification machines.
(b) Machine connections. Connection of ducts to the dehumidification machines will be made of unions or slip
joint connections, which permit easy removal of the machines for servicing.
(c) Humidistat. A hair-type humidistat will be set to maintain a 40-percent relative humidity, plus or minus 5
percent, within the dehumidified areas. The humidistat will be installed In the blank over the port side aft and the
machinery house compartment vent opening. The humidistat will be installed in a way that it will control the two
dehumidification machines. It will be wired to the machines with No. 18, two-conductor, rubber covered cable.
(d) Humidity sensing elements. Four humidity sensing elements will be installed on each lighter, as shown on
figure 42, and as outlined in 1 through 3 below:
1. Starboard engine radiator vent. One sensing element will be installed in the blank covering the
radiator vent.
2. Manhole access plates. Two sensing elements with cables will be installed in the blanks covering
the manhole access openings (one in each blank). The cables will extend up to walkways.
3. Engine compartment vent. One sensing element will be installed in the blank covering the engine
compartment vent forward of the operator's cab.
c.
Preparation of Rubber Tires for Storage.
(1) Blocking lighters during storage. Lighters will require blocking during storage. Pneumatic tires will be
inflated to normal operating pressure.
(2) Protection of tires during storage. Lighters stored in open areas or shed storage in excess of 90 days
will have the tires protected as specified below:
(a) Installed pneumatic and semipneumatic tires, manufactured from natural or synthetic compounds or a
combination thereof, will be protected during storage by in closing tires and wheels within protective polyethylene bags as
outlined in Specification MIL-T-46755(MO).
(b) Tires identified as manufactured with OZ compounds (as illustrated in fig. 2 of MIL-T46755/MO)) do not
require additional protection until 2 years from date of manufacture. After 2 years from the date of manufacture, tires will
be protected as specified in (a) above.
(c) When a lighter is equipped with a combination of NON-OZ and OZ tires less than 2 years old and any
other tire 2 years old or older, all tires on the lighter will be protected during storage as specified in (a) above.
(3) Preparation prior to placing bag over tire and wheel assembly. Prior to installation of the polyethylene bag, each
tire and wheel assembly will be cleaned in accordance with process C-1 of MIL-P-116 to insure removal of all foreign
objects imbedded or lodged in tire treads. Tires will be thoroughly dried in accordance with any applicable drying process
of MIL-P-116.
(4) Installation of bags. Polyethylene bags will be placed over the fire and wheel assembly and positioned in a
manner that will permit securing to axles. Excess material at the bag opening will be folded and formed to the contour of,
and against, the axle assembly. Bag will then be secured to the axle assembly, using rope conforming to class 2, size
(circumference) 5/8-inch, of T-R-571. Corners of the bag will be folded against the installed bag and secured in that
L-2 Change 2
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