Proceedings magazine is a communication tool for the Coast Guard's Marine Safety & Security Council. Each quarterly magazine focuses on a specific theme of interest to the marine industry.
Issue link: http://uscgproceedings.epubxp.com/i/264352
www.uscg.mil/proceedings 50 Proceedings Winter 2013–2014 The majority of the construction projects in Texas are strictly the "topsides" or modules that are subsequently integrated to the vessels' hulls. While some are built stateside, most of the FOI hulls arrive in various stages of completion from overseas, brought in on heavy lift ships. Although most Coast Guard inspectors and class sur- veyors certainly have the expertise in the commis- sioning activities on a platform, they typically lack the knowledge and engineering background that it takes to inspect the platform structure. Locating secondary and tertiary materials, identifying end conditions of the beams, knowing the different types of weld profles, and such can quickly become complicated. When dealing with a new construction project, one must also account for the hundreds of piping and instrumentation dia- grams needed to connect the piping of the production/ marine systems together. For example, one recent project included more than 100,000 linear feet of piping systems. Standards To aid this process, the primary structural code in the marine industry — the one used most frequently in foat- ing offshore installation construction — is the American Welding Society's (AWS) D1.1 Structural Welding Code. This is actually a more stringent code when compared to the structural standards in American Bureau of Ship- ping's (ABS) Rules for Building and Classing Offshore Mobile Drilling Units, which is the regulatory require- ment for the basis of Coast Guard structural standards, as adopted in 46 Code of Federal Regulations (CFR) Part 108.113. When you consider the design basis and application of the ABS rules versus the AWS Structural Welding Code, it becomes readily apparent why AWS D1.1 is the more stringent of the two. After all, AWS D1.1 is primarily U.S. Coast Guard Sector Corpus Christi is located at one of the nation's largest petrochemical ports and where foating offshore installation (FOI) fabrication and inte- gration takes place. From tension leg platforms to semi- submersible FOIs, we get to see it all down here in the South Texas coastal region. Coast Guard Oversight and Inspections One of the unique differences between Coast Guard oversight of a newly constructed vessel and the Coast Guard inspection process that takes place after an exist- ing vessel is placed in service is the level of detail that is spent in getting to know the intricate design of a plat- form's structure. When all is said and done, the platform structure of a vessel is the backbone of the whole rig, and if it isn't built correctly, then no amount of future regulatory oversight will be able to adequately address major design faws. P r eve n t i o n I m p r ove m e n t s Floating Offshore Installations Challenges in new construction project oversight. by CWO JOEL SMITH Marine Inspector U.S. Coast Guard Sector Corpus Christi Pictured is a model view of the frst semi-submersible FOI classed by DNV in the Gulf of Mexico. Photo courtesy of Mr. Craig Mullett, offshore construction manager. Winter �2013_45.indd 50 2/10/14 9:31 AM