DEPENDING ON THE PRODUCT SERVICE, INTERIOR OF TANKS SHALL BE INSPECTED EVERY ____________ YEARS.

DEPENDING ON THE PRODUCT SERVICE, INTERIOR OF TANKS SHALL BE INSPECTED EVERY ____________ YEARS.

• A. 10
• B. 5
• C. 7
• D. 9

Answer: (A)

The frequency is determined by how harsh the product service is on the tank interior. If the service is mild and the tank has appropriate protections, inspections can be scheduled less often, typically at a longer interval that corresponds to a decade-like maintenance cycle. This longer interval reduces downtime and maintenance costs while still catching signs of corrosion or degradation before they become serious. In more aggressive service—where the product is highly corrosive, abrasive, or deposits are likely—the interval would need to be shortened to catch problems earlier. The other options represent those shorter schedules, which are used only when risk is higher.

The frequency is determined by how harsh the product service is on the tank interior. If the service is mild and the tank has appropriate protections, inspections can be scheduled less often, typically at a longer interval that corresponds to a decade-like maintenance cycle. This longer interval reduces downtime and maintenance costs while still catching signs of corrosion or degradation before they become serious.

In more aggressive service—where the product is highly corrosive, abrasive, or deposits are likely—the interval would need to be shortened to catch problems earlier. The other options represent those shorter schedules, which are used only when risk is higher.