Floating Roof Stability.
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This presentation is provided to clarify the issues surrounding the current budget proposal to fund the SC-AST project “Seismic Sloshing Waves”. Really the project is to do the technical work needed to understand the behavior of floating roofs under any load conditions including sloshing waves. Many floating roofs exist which do not meet the broad API 650 strength requirements outlined in API 650 Appendices C and H. However, the industry takes the vendor communities’ word for it that they have provided sufficient strengh to meet the standards. Many examples and case histories show that this is not the case.
By performing this work not only with the basic requirements provide the industry with a tool to easily assess the strength of floating roofs to perform as intended but the work will provide the basis for designs needed in regions and areas subject to seismic activity.
Also attached is the original API proposal that was submitted to the CRE during the last meeting cycle.
This map shows the basic regions where this work will have the highest impact
What we observed in the last major refinery earthquake tank sloshing waves
Seismic waves cause floating roof to lose bouyancy
Seismic waves cause failure deck and floating roof sinking
This results in full surface fire and tank burndown