What is a key requirement for impact testing according to API 650 about average values?

• A. The average must be higher than the maximum value
• B. The average must comply with the specified minimum value
• C. Each specimen must meet the average value
• D. The average can disregard any outliers

Answer: (B)

In the context of API 650, a key requirement for impact testing is that the average value of the test results must comply with the specified minimum value. This requirement ensures that the material used in the welded tanks meets safety and performance standards necessary for oil storage applications. Ensuring that the average impact value meets or exceeds the minimum prescribed value indicates that the material has adequate toughness and can withstand the dynamic impacts it may experience in service.

This approach helps to validate the overall performance of the materials, rather than focusing solely on individual samples. By establishing an average that meets the minimum requirement, the standard ensures that variations among individual test specimens do not compromise the integrity of the material as a whole. Compliance with this standard reflects a commitment to quality and safety in tank construction.