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 TB 740-97-4
27.1. Safety and Security of Wet Stored Vessels. a. Wet stored vessels require constant surveillance and special precautions to
guard against the possibility of flooding conditions resulting from under water hull damage or failure of thru hull fittings below the
waterline. The possibility of flooding or listing of wet stored vessels will be given the highest consideration by the vessel custodian.
b. Vessel custodian will assure that available means within the local area for early detection of flooding and listing conditions
are employed. As a minimum, these precautions will provide:
(1) Security inspections. Patrol type Inspections at least once daily to check mooring lines and vessel exterior.
(2) Draft markings. Draft markings painted fore and aft for distance observation by water and/or shore patrol.
(3) Flooding alarms. Flood alarm systems will be installed on all wet stored vessels except open type barges and lighters.
Visible type flood alarm system lights should be visible for distance observation (approximately 1 mile). The flood alarms may be of
any of the following types:
a. Styrofoam ball enclosed mercury switch type.
b. Tube type, activated by water pressure
c. Float and arm type with waterproof switch.
c. Flood alarm systems may be fabricated locally, or any of the above stock type is acceptable. Regardless of the type used,
they should be simple in design and require no elaborate blueprints for installation, only a light gauge wire should be necessary
between the sensing device and top side alarm. Flood alarms may be energized by shore power 110V AC, or battery powered if
shore power is not available. Alarms will be tested at time of vessel closure and on a quarterly basis thereafter. Areas for
consideration for installation of bilge alarm devices are:
(1) Engine room, machinery spaces and shaft alleys.
(2) Steering machinery spaces below the waterline.
(3) Each major watertight sub division of the vessel.
(4) All other compartments/spaces where flooding could occur through hull fittings without activating other installed
flooding alarms aboard the vessel.
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