What is a common cause of tank failure that API 650 aims to mitigate?

• A. Improper insulation methods
• B. Corrosion
• C. Poor material quality
• D. Inadequate drainage systems

Answer: (B)

Corrosion is a significant concern in the design and construction of welded tanks for oil storage, which is why API 650 includes comprehensive guidelines aimed at mitigating its effects. Corrosion can lead to structural failures, leaks, and ultimately the failure of the tank, posing serious risks to safety and the environment.

API 650 addresses corrosion by specifying the materials and construction practices that should be used to minimize the risk of corrosion throughout the operational life of the tank. For example, the standard often recommends the use of corrosion-resistant materials, protective coatings, and proper maintenance practices to extend the lifespan of the tank and ensure that it remains safe and functional.

The other factors—such as improper insulation methods, poor material quality, and inadequate drainage systems—are also important considerations in tank design, but corrosion remains one of the primary factors leading to failures in the long term. By focusing on corrosion prevention and mitigation strategies, API 650 helps ensure the integrity and reliability of welded storage tanks in varied operating environments.