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 TB 55-1900-231-15
CHAPTER IV
CARE OF SUPPLIES IN STORAGE (COSIS)
A. Watercraft that are processed for storage in accordance with this procedure will require periodic surveillance and
visual inspections.
The HLPS vessel crew is charged with this responsibility and will ensure that:
1. The dehumidification (D/H) level of 40 percent, plus or minus 5 percent is constant throughout the D/H
zones.
2. Contact preservation on machinery and other components has not deteriorated to a level allowing
corrosion to occur.
3. Exterior sealing has not deteriorated to a level allowing excess humid air to enter the D/H zones.
B. Surveillance is a system where equipments are subject to, but not limited to cyclic, scheduled and special
inspections and continuous actions to ensure that the equipment is maintained in a ready to use status.
C. Visual inspections are inspections by visual means to observe the condition of preservation to detect
deficiencies.
D. Deficiencies found during surveillance and visual inspections will be classified as major or minor deficiencies and
are defined as follows:
1. Major defect is a defect that:
(a) Will affect the material readiness posture of watercraft.
(b) Will limit or restrict the watercraft from performing its intended functions.
(c) Will probably cause operating failure of the watercraft.
(d) Will probably allow the watercraft to deteriorate and degrade during storage.
(e) Will cause excessive downtime and increased maintenance.
2. A minor defect is one that does not reduce the usability of the watercraft for its intended purpose or has no
significant bearing on the effective use or operation of, or affects the overall appearance.
E. Corrosion that is found during surveillance and visual inspections will be reported as Stage I, II, III and IV
corrosion and are defined as follows:
1. Stage I corrosion. Discoloration, staining. No direct visual evidence of pitting, etching or other surface
damage.
2. Stage II corrosion. Loose rust, black or white corrosion accompanied by minor etching and pitting of
surface. No scale or tight rust.
3. Stage III corrosion. Rust, black or white corrosion accompanied singly or in combination with etching,
pitting or more extensive surface damage. Loose or granular condition.
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