Stage I and II. Platform Strength Evaluation, Offshore Panama City, Florida

摘要

The inspection program was developed based on the results of the structural analysis of the two platforms as originally constructed. This analysis consisted of simulating the two platforms with present state of the art computerized structural analysis programs for offshore platform analysis. Based on the available oceanographic data, it was determined that a storm with a 100 year return interval, accepted as a present day standard, would have wave loaded the deck. Hence the maximum wave height that could be utilized (wave crest elevation less than bottom of deck beams) was equivalent to a 20-year design storm. As a result of the analyses, several joints were selected for detailed subsea inspection. The inspection program covered both the above and below water structural conductions of the two platforms. For the subsea inspection, a complete visual and video recorded coverage of the platform was performed. Biofouling measurements were conducted, cathodic potential measurements taken, and pitting and damaged members visually recorded. Also, several selected joints on each platform were waterblasted and inspected in detail. Still photographs of the joints only recorded the observations.