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 TB 55-1900-231-15
CHAPTER III
PRESERVATION REQUIREMENTS
1. INTRODUCTION:
A. The watercraft listed in Chapter II, Section I., 2., 3., 4., and 5. will be preserved, placed under dynamic
dehumidification and dry stored.
The preservation is modified to enable the craft to be
deprocessed/activated with (2) days, yet remain in storage for a period up to 24 months in a relative static
condition. The modified preservation of these craft is based upon the assumption that they are in material
Condition Code "A":
(a) the mechanical and electrical systems are in the highest state of material readiness;
(b) that the hull interior and exterior is in good condition and protected with an intact paint system:
(c) that all doors, hatches, port lights, and vent covers are in good condition with proper fitting gaskets
and operable dogs/dogging devices/securements;
(d) all watercraft will have a complete BII set including C & E equipments/components.
B. This chapter contains general preservation procedures, which are applicable to all watercraft considered in
this procedure. Procedures applicable to only a specific craft are provided in Appendices A, B, C, D, and
E.
2. UNDERWATER HULL PROTECTION: Prior to accomplishing the general preservation instructions contained in
paragraph 3 below and respective appendices, the underwater hulls will be cleaned and preserved. Accordingly, all
watercraft will undergo drydocking for required underwater hull repairs, overhaul of the sea valves and strainers, cleaning
and painting, and renewal of the cathodic protection system (sea chest and hull zincs), shaft alignments, cutlass bearing
renewal, etc. Drylock specification shall include:
(a) Indefinite items for underwater weld repair, hull plug welds and plate renewal, all of which will be
determined after drydocking.
(b) Routine overhaul of sea valves and strainers.
(c) An item for cleaning and painting to be IAW TB 43-0144, 9 March 1987.
(d) The cathodic protection system (zinc configuration) shall be type ZHS (bolt-on) zincs and shall be
installed IAW TB 43-0144.
CAUTION
To alleviate a potential deterioration problem with the underwater paint system, all underwater
surfaces must be washed down with fresh water immediately after each craft is stored on the
HLPS vessel. It is important that all marine growth and slime be removed. Extreme care shall
be exercised to prevent damage to the underpaint systems during wash down. The fresh water
washdown is the responsibility of the storing agency.
3. GENERAL PRESERVATION INSTRUCTIONS: Equipment, systems, and machinery of each watercraft will be
processed IAW the following general instructions. Dehumidification will be accomplished IAW Appendices A thru
D. Once the watercraft are preserved (and subsequently stored aboard the HLPS vessel), the interiors will
remain in an unlighted condition to preclude or minimize common bacteria growth.
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