What is the purpose of tank skirt designs outlined in API 650?

• A. To enhance aesthetic appeal
• B. To prevent leaks
• C. To provide structural support
• D. To increase tank capacity

Answer: (C)

The tank skirt designs outlined in API 650 serve the primary purpose of providing structural support for the tank. A skirt is a vertical extension of the tank shell, designed to distribute the weight of the tank and its contents more evenly to the foundation. This feature is crucial in ensuring stability, especially in conditions where the tank may experience lateral loads, such as wind or seismic activity. The skirt contributes to the overall integrity of the tank structure by minimizing the risk of buckling or failure under loads.

While other aspects, such as aesthetics or capacity, may have some consideration in tank design, the primary focus of skirt designs is on structural functionality to maintain the safety and operability of the storage facility. This focus on structural support is what makes this aspect of tank design critical in adhering to industry safety standards as established in API 650.