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 For example, on extensively corroded steel H - p i l e s , a small percentage of
piles receive u l t r a s o n i c t h i c k n e s s measurements to determine typical
c r o s s - s e c t i o n p r o f i l e s . The cross-sections determined by these spot checks
may be used to determine individual H-pile vertical load capability.
Level III. T h e L e v e l I I I e f f o r t is a highly detailed and
1.2.3.3
thorough investigation to detect the full extent of hidden or interior
damage and the loss in material thickness (Figures 1-1 and 1-3).
Recommendations for repairs are estimated based on the size of sample
examined by a Level III effort.
Detailed underwater engineering surveys or
100% Level III effort examination are required to obtain complete
i n f o r m a t i o n f o r development of plans and specifications. L e v e l I I I o f t e n
rewires the use of Non-Destructive Testing (NDT) Techniques, but may also
require t h e u s e o f p a r t i a l l y d e s t r u c t ive techniques such as sample coring
through concrete and wood structures, physical material sampling, o r i n S i t u
surface hardness testing. A Level III effort u s u a l l y r e q u i r e s p r i o r
cleaning. The use of NDT techniques are generally limited to key structural
areas, areas that may be suspect, or to structural members which may Se
representative of the total structure.
Figure 1-3
Measurement of Steel Flange With Mechanical Calipers
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