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 TB 55-1900-231-15
B. Dehumidification: Critical areas of each craft shall be placed under dehumidification IAW Appendices A through
E each of which pertains to a specific design craft. Sealing of the watercraft shall be accomplished in as much
as possible utilizing installed doors, scuttles, covers, port lights, etc., augmented with tape, glue and strip coat,
plywood and duct seal. The humidistats and sensing elements to be installed by the (HLPS) or (SSB) Storage
Vessel IAW the locations depicted in Appendices A through E shall be compatible with the (HLPS) or (SSB)
vessel dehumidification and monitoring systems. The (HLPS) Storage Vessel shall also make up the ducts from
the dehumidification system to the dry and humid air connections on the craft which are identified in Appendices
A through E, by a stencil on each craft applied by the activity performing preservation.
C. Lubrication: Each craft will be lubricated IAW the applicable lubrication order, except those areas requiring the
application of contact preservatives.
D. Hazardous Material: Materials considered hazardous include, but are not limited to, open or used containers of
paint, thinners, solvents or other flammable materials and pyrotechnics.
(1) Paint, Thinners, Solvents, etc.: Open or partially used container of flammable materials shall be removed
from the craft by the preserving activity. Disposal shall be by approved methods.
(2) Pyrotechnics: Shall be inventoried, boxed/packaged, identified by respective craft and removed from the
craft. The pyrotechnics will be turned over to the HLPS ship for storage and returned to the respective
craft at the time of activation.
(3) For design 3006, tug 100 ft., the two (2) oxygen and two (2) acetylene cylinders normally supplied empty
as part of the BII (Basic Issue Items), shall be filled to capacity and placed in a rack or crate constructed so
as to support the bottles in an upright position on the deck of the vessel. For reasons of safety the oxygen
and acetylene storage racks shall be separated within the limited deck area of the design 3006 tug. For
instance one forward and the other aft, or port and stbd., respectively.
E. Machinery and Miscellaneous Equipment Covers: Normally machinery and miscellaneous equipments
exposed to the elements are enclosed and protected with dehumidified air and/or sealed with pressure sensitive
tape, glue, strippable and bituminous coatings. In lieu of performing the above, machinery and miscellaneous
equipments will be protected from the elements with covers manufactured from herculite.
(1) The herculite, a commercial trade name for Nylon Chloroprene, NSN 8305-00-641-5598, Color 3644Q light
gray, covers shall be provided by the activity or organization.
(2) The herculite covers will be manufactured with grommets and nylon draw strings in order to secure the
cover to machinery and miscellaneous equipment. The seams should be stitched with ultra-violet resistant
thread to prevent separation during storage.
(3) The cover must be tied down securely to prevent damage from the wind.
(4) It is the responsibility of the storage activities and organizations to lift the actual dimensions from the
watercraft for each cover to be fabricated by local vendors.
(5) Research reveals that herculite is the best material to use for covering machinery and miscellaneous
equipments exposed to the elements. The herculite cover will breathe a small amount of air and will
provide for air circulation within the cover.
(6) Requirements and quantities for each watercraft are identified in Appendices A through D.
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