A major portion of the UCT's activity is directly related to the underwater inspection of a wide variety of waterfront structures and other marine facilities. UCT underwater inspections are primarily visual observations of the facility being inspected. Quantitative measurements, such as underwater voltmeter readings on metal structures and thickness measurements on mooring chain and steel piling, are often taken.

Before making the observation, it is usually necessary to clean the structure of marine growth and fouling. Several techniques are used to accomplish this cleaning, ranging from hand cleaning with scrapers and wire brushes to the use of waterblasting jets and hydraulically-powered mechanical abrasive tools. These techniques are discussed in Section 2.3.

This chapter has been arranged to present a general description of:

• Waterfront facilities (Section 3.2)

• General inspection procedures (Section 3.3)

and detailed descriptions of the procedures to be used for:

• Inspecting steel structures (Section 3.4)

• Concrete structures (Section 3.6)

• Timber structures (Section 3.7)

• Stone masonry structures (Section

• Coastal protection structures (Section

• Graving drydocks (Section 3.10)

Each of these sections also includes a description of the causes of deterioration of the relevant type of structural material.

In addition to the facilities listed above, the UCTs often are required to carry out inspections of undersea cables, wire rope, pipelines, and instrument arrays. However, these inspections are often performed in conjunction with repair or installation operations and, consequently, are discussed in Chapters 5 and 6.

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