Figure 4-85. Bilge system foot valve, hull numbers 8540 thru 8560 and 8580 thru 8618.
(4) Remove clamps and hoses at the top of the
heat exchangers that connect to the raw water line.
(1) Close fuel oil valve from the fuel tank (in
(5) Apply heat to the solder around the bottom
of the heat exchanger until the heat exchanger can be
(2) Disconnect top and bottom hoses from fuel
freed from the raw water line.
oil heat exchangers.
c. Installation. Resolder heat exchanger to the raw
(3) Drain fuel oil from the heat exchangers.
water line and reconnect hoses and clamps.
SECTION XXI. HULL
battery is connected between two underwater pals
through error. The inspection and correction of stray
A steel hull is subject to both mechanical and corrosive
electrical current will aid in the reduction of damage by
deteriorating forces. Mechanical forces include normal
twisting and vibrations, as well as more violent events
such as collisions, grounding, and explosions. These
4-105. Inspection and Repair
forces can weaken and loosen rivets end welded seams
a. Hull. The hull of the landing craft should be
in the hull and damage frames ad plates. All vessels that
contain metal are subject to deterioration by electrolytic
inspected for leaks, punctures, cracks, dirt, and rust.
corrosion or electrolysis. This chemical re .action exists
The paint should be checked for flaking, chipping, and
naturally where two underwater metals of different
b. Ramp. The ramp surfaces should be checked
chemical composition are connected electrically, which
causes the wasting *way, or going into solution, of one
for damage and deterioration. Check for leaks around
of the metals. Zinc or magnesium protective anodes (fig.
the ramp when the landing craft is afloat.
S16) are used to prevent corrosion of the hull.
c. Hatches and Deck Port. Inspect hatches and
Electrolysis can also occur when the ship's
deck ports for damage. Inspect gaskets for
deterioration. Replace unserviceable items.