Which option describes the maximum external inspection interval for Class 3 piping?

Which option describes the maximum external inspection interval for Class 3 piping?

• A. 8 years
• B. 12 years
• C. 15 years
• D. 10 years

Answer: (D)

Inspection intervals are set by service class and risk, with the external check schedule capped to a maximum that keeps corrosion and damage from going undetected. For Class 3 piping, the longest allowed time between external inspections is ten years. This reflects a balance: the risk level isn’t as high as in the most critical classes, but you still need periodic confirmation of the pipe’s condition. Shorter intervals would be used if higher risk or prior issues were identified, while intervals of eight, twelve, or fifteen years don’t align with the established maximum for Class 3.

Inspection intervals are set by service class and risk, with the external check schedule capped to a maximum that keeps corrosion and damage from going undetected. For Class 3 piping, the longest allowed time between external inspections is ten years. This reflects a balance: the risk level isn’t as high as in the most critical classes, but you still need periodic confirmation of the pipe’s condition. Shorter intervals would be used if higher risk or prior issues were identified, while intervals of eight, twelve, or fifteen years don’t align with the established maximum for Class 3.