Diesel tank inspection openings must be of what minimum size and located where?

The correct answer indicates that diesel tank inspection openings must be a minimum of 4.75 inches and located on the top of the tank. This specification aligns with the standards set to ensure that the tank can be adequately inspected for cleanliness, structural integrity, and to facilitate access for maintenance activities.

Placement on the top of the tank allows for easy access without having to deal with potential hazards that may arise from contaminants or residual fuel. Additionally, a top location can help minimize the risk of spilling or leaking during inspection, which is crucial for safety and environmental concerns associated with diesel handling.

The specified minimum size of 4.75 inches is sufficient to allow for the insertion of inspection tools and for the examination of the tank's interior to check for sediments or other issues that could affect performance or safety. The combination of size and location is designed to enhance the tank's maintainability while adhering to safety protocols.