UFC 4-150-07
19 June 2001
a. All superstructure and
Figure 5-1. Exposure zones on
piling/sheet piling above the waterline,
piling.
including the splash and tidal zones (Figure
5-1), should be inspected annually.
b. Concrete/steel structural
members at the splash/tidal zones (Figure 5-1)
and downward should be inspected at least
every 6 years. As deterioration is discovered,
the level of inspection and frequency needs to
increase accordingly. For steel structures, the
age of the structures is a primary factor since
the rate of deterioration due to corrosion is
fairly constant. Likewise, concrete in a
saltwater environment deteriorates chemically
with time, especially if cracks are present to
allow the seawater to reach the structure's
interior.
c. Timber members should be inspected at least every 3 years and,
as above, more frequently and intently as deterioration is discovered. In areas
where marine animal infestation is known to be a problem, increased inspections
are especially important.
If it is not feasible to thoroughly inspect all elements of a structure
(e.g., underwater inspection of a series of piers with many piles), selecting an
optimum number of structural elements or members is crucial to obtaining
accurate information representative of the overall condition of the structure.
Development and validation of sampling criteria and procedures has been
reported in Naval Civil Engineering Laboratory's TN-1762 Sampling Criteria and
Procedures for Inspection of Waterfront Facilities, September 1988. Statistical
sampling techniques using probability theory provide a method for determining
condition parameters for the entire population based on information from the
sample elements, with a calculated confidence level and precision.
5-3.2
Inspectors. Inspections may be by a variety of individuals at different
times for different reasons. It should be notes that periodic comprehensive
inspections are done as part of the Underwater Inspection Program administered
by the Ocean Construction Division of the Naval Facilities Engineering Service
Center, East Coast Detachment (NFESC Code 551.)
5-3.3
Collecting Inspection Plan Data. Before starting an inspection, all
available information about the facility should be gathered. This includes prior
maintenance and inspection records, facility drawings and site survey reports,
general background information, and environmental data, including:
Atmospheric temperature range
5-7
Previous Page
