Why is the mechanical line leak detector test leak rate set to 3-1/2 milliliters per second?

The mechanical line leak detector test is set to a leak rate of 3-1/2 milliliters per second because this value represents the sensitivity of the mechanical leak detection system. The design of mechanical leak detectors is based on the ability to accurately identify leaks that are significant enough to indicate a problem without being overly sensitive to minor fluctuations that do not indicate a leak. This leak rate helps ensure that the system can effectively detect actual leaks while minimizing false positives.

The leak rate is calibrated to balance the need for reliable detection with practical operational considerations, ensuring that any detected leak is likely to be a significant issue that requires attention. By focusing on this threshold, operators can maintain effective oversight of their fuel systems while ensuring the integrity of the operation.