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
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.
Measurement of Steel Flange With Mechanical Calipers