At least once every how many months must one fuel oil service tank per compartment be inspected?

The correct interval for inspecting a fuel oil service tank per compartment is every 18 months. This schedule is established to ensure the maintenance of fuel oil systems and to mitigate potential risks such as contamination or mechanical failure. Regular inspections are vital for operational safety and the efficiency of the fuel system, helping to identify any issues that could arise from long periods of inactivity.

Other options suggest either too frequent or too infrequent inspections. An interval of 6 months might be excessive, leading to unnecessary work and resource expenditure. Conversely, a 12-month inspection frequency does not align with regulatory standards that mandate more extended periods between inspections for certain types of tanks. The 24-month suggestion is too infrequent to adequately monitor and maintain safety standards, increasing the risk of problems developing undetected. Therefore, the 18-month requirement strikes a balance between thoroughness and practicality in tank maintenance.