Which factors are critical in determining the tank's foundation according to API 650?

• A. Scenic views of the tank location.
• B. Weight and stress considerations.
• C. Types of tank materials.
• D. Only local building codes.

Answer: (B)

The critical factors in determining the tank's foundation, according to API 650, primarily focus on weight and stress considerations. A tank's foundation must be designed to support its weight when filled with liquid, as well as accommodate the stresses imposed during loading and unloading operations, temperature variations, and potential soil settlement. These factors ensure the integrity and stability of the tank structure, preventing structural failures and ensuring safe operation.

The weight of the tank and its contents directly influences the type of foundation required, taking into account not just the static loads but also dynamic forces. Stress considerations also encompass issues such as the distribution of loads over the foundation and how the soil will interact with them, which are paramount for the tank's long-term safety and performance.

While building codes and construction materials can influence the overall design and compliance process, they are not as critical as the immediate structural requirements related to weight and stress in terms of foundation design. Scenic views, while important for aesthetic considerations, do not impact the structural integrity or operational safety of the tank, nor do local building codes alone dictate foundation requirements without considering the physical attributes of the tank and its intended use.