In order to prevent undetected leaks, how much larger must the conduit be than the supply and return lines?

The requirement for the conduit to be one pipe size larger than the supply and return lines is established to provide adequate space for any potential leaks that may not be easily detected. This design consideration is crucial for safety and efficiency in systems that transport oil or fuel, as undetected leaks can lead to significant environmental hazards and operational disruptions.

By ensuring the conduit is larger, there is a greater volume to accommodate any leakage while still allowing the lines to function properly. This additional room provides a buffer zone that can help contain the leak until it can be properly addressed. Moreover, having a conduit that is one size larger allows for easier inspection and maintenance, ensuring that any signs of leakage can be spotted without complicated interventions.

Choosing a conduit size that is too small may result in inadequate space to effectively monitor and isolate leaks, which could lead to severe consequences in terms of safety and compliance with regulations. This understanding aligns with best practices in the field and emphasizes the importance of proper sizing in plumbing and oil fuel systems.