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 TB 55-1900-231-15
4. Stage IV corrosion. Rust, black or white corrosion progressed to the point where fit, wear, function or life
of the item has been affected. Powdered or scaly condition, with pits or irregular areas of material
removed from the surface of the item.
F. Once the watercraft are stored on the HLPS or SSB vessel and dehumidification machines and PVC piping are
installed, the surveillance shall be performed during the intervals specified below:
1. Check the dehumidification (D/H) level within each zone daily.
(a) The relative humidity factor (RH) of 40 percent plus or minus 5 percent should be achieved within
three (3) weeks after D/H machines are in operation.
(b) If the RH factor is not achieved within three (3) weeks, additional exterior sealing will be required.
(c) Once the RH factor of 40 percent, plus or minus 5 percent is achieved, check each zone every two
(2) weeks.
2. Adjust the humidistat(s) as required to maintain the required RH factor.
3. The psychrometer, NSN 6685-00-826-1662, shall be used physically to verify the relative humidity within
the D/H zones. The exterior accesses to the zones should not be left opened for a prolonged period of
time, to prevent the entry of humid air from entering the D/H zone. Verification of relative humidity within
the zones shall be accomplished in more than one compartment, i.e., on the tug, design 3006, verification
should be accomplished, but is not limited to, the engine room, crews' quarters, mess area and pilothouse.
4. Records of relative humidity readings shall be maintained on each watercraft. Figure IV-1 is a sample of a
form, titled, "D/H Log" that will be utilized for record purposes.
G. The following inspection procedure shall be followed and records shall be maintained to verify that watercraft
stored in accordance with this procedure do not deteriorate while they are in storage.
1. During activation, and/or every six (6) months inspect contact preservatives on all watercraft equipment for
deterioration, the first signs of deterioration will be the presence of Stage I corrosion.
(a) When the scheduled six (6) month inspection falls during the month that watercraft are scheduled for
activation, the inspection will be performed during activation.
{b) A variance of twenty-five (25) percent (45 days) plus or minus, is authorized for performing the six
(6) month inspection from the scheduled inspection date.
(c) On completion of activation and represervation the next inspection will be scheduled and performed
six (6) months from the date represervation was completed.
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