What is the acceptable leak detection method for tanks?

Interstitial monitoring is considered an acceptable leak detection method for underground storage tanks because it effectively monitors the space between the inner and outer walls of double-walled tanks. This method allows for the detection of leaks from either the inner tank or the outer wall, providing an additional layer of safety and environmental protection. It employs sensors that can detect liquid or vapor that may indicate a malfunction or leak, ensuring timely alerts to prevent contamination of the surrounding environment.

In contrast, visual inspection, while important as part of routine maintenance, may not reliably detect underground leaks due to limited visibility and access. Pressure testing can also be beneficial for certain assessments but is often not appropriate for ongoing leak detection as it typically requires the tank to be out of service. Manual gauging, while a method used in some contexts, does not provide the continuous monitoring capability that interstitial monitoring offers, making it less effective for detecting small leaks or changes over time.

The robustness of interstitial monitoring, with its proactive approach to leak detection and its capability to notify operators of potential problems seamlessly, aligns well with regulatory requirements for underground storage tanks, making it the preferred method among leak detection strategies.