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TM 55-1905-223-SDC
Ships have been lost or have suffered unnecessary fires or flooding damage merely because
investigating crew members have neglected one, or more of the above principles.
d. Compartments adjacent to damaged area.  Major damage is often more extensive than
in every compartment preliminary examination might indicate.  Investigation should cover all spaces,
systems, and structures adjacent to the damaged area, even to a depth of two or three compartments in
all directions. This is to locate additional damage and to establish gas, flooding and fire boundaries around the
damaged areas.
e. Inspection of entire ship. If an underwater explosion occurs close to the side of the ship, all voids,
tanks, and lower compartments shall be investigated. All fuel oil tanks on the ship should be investigated
for damage by taking samples of the oil and testing them for water. Likewise, potable and feed water tanks
should be tested for salinity. There shall be a sounding detail in each repair party, and all crew members
members should know where and how to sound oil compartments in their own and adjacent areas.
f.
Safety measures.
WARNING
Investigation of structural damage by visual examination presents many difficulties and
dangers. To do a thorough job, it will often be necessary to open one or more watertight
doors or hatches. It is unwise to open any such closures in the vicinity of damage, and it
should be done only after a thorough investigation by means of soundings, and after
obtaining permission from Vessel Master or Chief Engineer whenever the situation
permits. Opening a door or hatch to a flooded space will result in additional flooding.
No watertight door, hatch, scuttle, or manhole should be opened until it is known definitely that the
compartment on the other side is either completely dry or that flooding is minimal enough that opening the
closure will not permit flooding to spread. When a compartment is equipped with a sounding tube, the
existence of flooding can be determined by slowly loosening the sounding tube cap. If air escapes
under pressure followed by a trickle of water, a solidly flooded compartment is indicated, while the
cates a partially flooded compartment. Many compartments are not provided with the air escapes; however,
this is no bar to investigation. Tapping on a bulkhead with a hammer or backing off on the air test cap will
often disclose the presence of water on the other side; the exact height of water may be judged by
variation in the tones produced when the bulkhead is struck at different levels.
Inaccuracies caused by a hidden frame may be avoided by tapping the bulkhead at two locations.
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