What is the design temperature limit for tanks supported by grillage according to API 650?

• A. 150F
• B. 200F
• C. 250F
• D. 300F

Answer: (B)

The design temperature limit for tanks supported by grillage according to API 650 is indeed 200°F. This limit is specified to ensure structural integrity and safe operation of the tanks used for storing oil and other hydrocarbons. At temperatures exceeding this limit, the material properties of the tank and support structure may change, potentially leading to risks such as deformation, failure, or compromised safety of the storage tank system.

Design considerations in API 650 take into account various factors including material strength, thermal expansion, and the characteristics of the fluids being stored. The 200°F threshold is established to maintain safety and reliability while accommodating typical operational temperatures within the industry. This standard helps in preventing potential failures that could lead to leakage, environmental hazards, or accidents.