What does API 650 stipulate for tank foundation design?

• A. It must be aesthetic and colorful.
• B. It must be stable and well-drained.
• C. It can be built on any surface.
• D. It should only be temporary.

Answer: (B)

API 650 emphasizes the importance of a stable and well-drained tank foundation to ensure the structural integrity and proper functionality of welded tanks used for oil storage. A stable foundation is crucial because it supports the weight of the tank when filled and minimizes the risk of settlement, tilting, or other structural failures that can arise from uneven settling. A well-drained foundation is equally important to prevent water accumulation that can undermine the stability of the tank and lead to corrosion or other damage over time.

By ensuring that the foundation is both stable and capable of effective drainage, API 650 helps to reduce the likelihood of environmental damage and enhance the safety of the tank's operation. This consideration is integral to maintaining the long-term performance of the tank and protecting both the asset and its surrounding environment.