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 TB 740-97-4
24. Storage Locations. The physical characteristics of the wet storage area will dictate the distribution and mooring of vessels.
Within the limitations of the physical site, security and accessibility, vessels will be grouped in formation by type and size in locations
that provide natural shelter and permit easy withdrawal of individual vessels from the group. Depth of water in the berthing areas
must be sufficient to prevent grounding of the vessels under all tidal conditions. Selection of mooring devices will be governed by
local conditions.
25. Ventilation. Ventilation of vessels or zones of vessels, not under dehumidification, will be that required to prevent condensation
within the vessels. Hatches, accesses and other openings used to provide ventilation will be shielded with suitable covers or
ventilators to prevent the entry of water. When wood ventilator covers and/or shelters specified herein are used for venting voids and
protection of deck machinery, they will be the demountable type and will include the fabrication features as shown in figures 29, 50,
and 65. The sides of ventilator covers and shelters may be constructed of nominal 1/2 to 5/8 inch exterior type plywood Grade A/C,
conforming to NN-P-530 or nominal 1 inch tongue and groove lumber. Louvered ends will be covered with standard aluminum insect
screen. The interior and exterior wood surfaces of the ventilator cover including the louvers shall be painted with two (2) coats of
deck gray paint conforming to MIL-P699, Type A to prevent decay, delamination and dry rot. When louvered and screened openings
in covers do not provide sufficient ventilation, such devices as rotating vane-type ventilators will be installed. Shielding of installed
deck equipment will be designed to promote air circulation to the item.
26. Ballast. All temporary solid type ballast such as pig iron, chain, blocks, etc., shall be removed when vessel is placed in storage.
27. Drydocking. Drydocking of wet stored vessels will be performed at the minimum frequency consistent with prevention of
excessive deterioration. In all cases, initial drydocking will be accomplished in accordance with requirements specified in a, b, and c
below. Differences in characteristics of berthing waters and other local variants preclude establishment of a cycle common to all
storage sites. Each storage activity will develop drydocking cycles through a program of systematic sampling. Drydocking reports
will be prepared by the assigned ship surveyor in accordance with AR 750-1 and TM 38-750. Required reports will be prepared upon
completion of each drydocking and not later than 10 workdays following the date vessels are refloated. Preparation and distribution
will be in accordance with instructions in TB 55-1900-201-45/1. Report of painting and condition of vessel bottom will be reported in
accordance with AMCR 750-22. A copy of this report will be retained on-board the craft in storage or at storage area headquarters; a
copy will be on the craft at time of activation; a copy furnished this Command, ATTN: AMSTS-MMM(NMP). The method of
determining drydocking cycles will be generally as follows:
a. Steel Hull Vessels. Representative craft will be drydocked one (1) year after their last drydocking. Assuming that the
condition of their bottoms is satisfactory, additional similar craft will be drydocked 18 months after their last drydocking. This
procedure will be continued at least at twelve (12) month intervals until conclusive indications are found that the normal life
expectancy of the bottom protection has been reached. Due consideration will be given to differences on paint systems and effects of
location in storage of the sample craft.
b. Wood Hull Vessels. Establishment of drydocking cycles for wooden craft will follow the same general pattern as for steel
hull vessels except that drydocking will commence six (6) months after the last drydocking.
c. Based on the results of the above, local Commanders may determine the frequency of continuing drydocking cycles.
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