Manual tank gauging cannot be used on tanks with a capacity over how many gallons?

Manual tank gauging is a method used to measure the amount of liquid in a storage tank, typically involving physical measurements taken at set intervals. However, there are limitations associated with this method, particularly concerning the tank's capacity.

For tanks with a capacity over 2,000 gallons, the manual gauging method is regarded as less reliable for detecting leaks, as the potential margin of error increases significantly. Regulatory guidelines and best practices establish that for tanks larger than this capacity, more sophisticated methods such as automatic tank gauging systems or other continuous monitoring technologies must be utilized. These advanced systems provide better accuracy and reliability in leak detection, which is crucial for environmental protection and compliance with regulatory standards.

Thus, the threshold of 2,000 gallons serves as a guideline to ensure that larger tanks are monitored using methods that can provide consistent, accurate data to ensure the safety and environmental integrity associated with storing petroleum products and hazardous substances.