How many gallons per hour must an automatic tank gauge be able to detect a leak?

An automatic tank gauge (ATG) is an essential instrument used in monitoring underground storage tanks (USTs) for potential leaks. The requirement for an automatic tank gauge's leak detection capability is determined by regulatory standards to ensure the environmental safety and integrity of the storage system.

A leak rate of 0.2 gallons per hour is the correct benchmark for ATGs, as this threshold aligns with industry regulations and best practices. Detecting leaks at this rate allows for early intervention before a significant volume of product is lost, minimizing environmental risks and financial implications.

The choice of 0.2 gallons per hour represents a balance between sensitivity and practicality, ensuring that any leaks are noticeable without overwhelming operators with false alarms from minor fluctuations in liquid levels. This threshold is established to help operators maintain vigilance regarding potential leaks, thereby supporting compliance with environmental regulations and safeguarding public health.

Other options may not meet the regulatory standards set forth for leak detection capabilities in USTs. While lower detection rates might seem beneficial in terms of sensitivity, they could prove to be impractical or exceed what is reasonably necessary for effective monitoring.