Which is a key design feature required for tanks under API 650?

• A. A double roof system
• B. A suitable foundation capable of supporting the tank's weight
• C. A floating roof mechanism
• D. A complex monitoring system

Answer: (B)

A suitable foundation capable of supporting the tank's weight is a fundamental design feature for tanks constructed under API 650. This requirement is critical because the structural integrity and stability of a tank are heavily dependent on the foundation. The foundation must be designed to adequately distribute the load of the empty and full tank, as well as withstand environmental factors such as wind and seismic activity. An improperly designed foundation can lead to tilting, cracking, or even catastrophic failure of the tank.

While options like a double roof system and a floating roof mechanism can enhance safety and reduce evaporation losses, they are not universally required for all tanks under API 650. Additionally, a complex monitoring system, while beneficial for operational efficiency, is not a design feature stipulated in the API 650 standard. Thus, having a suitable foundation is a crucial and indispensable requirement to ensure the safe operation and longevity of the tank.