Continuous In-Tank Leak Detection

In 2015, Continuous In-Tank Leak Detection [CITLD] was added as a release detection method through a Federal Underground Storage Tank [UST] Regulation. The regulation also establishes requirements for CITLD's operation and maintenance.

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What is Continuous In-Tank Leak Detection?

Any and all methods based in statistics where measurements are gathered incrementally by a system on an uninterrupted basis to determine the leak status of a tank.

Compliance with Regulation

• CITLD Methods Can Be Employed for Tanks Installed Before or On April 11, 2016
• Measurements are Gathered Incrementally Within a 30-Day Monitoring Period

Release Detection Methods

There Are Two [2] Major Groups:

1. Continual Reconciliation
2. Continuous Statistical Release Detection [Continuous Automatic Tank Gauging or ATG]

* Inventory Measurements are Obtained Through Permanently Installed Sensors in the Tank by Both Groups

• A Microprocessor or Other Control Console is Used to Process Data in the ATG System
• Dispensing Meters Which Allow for Automatic Recording and Use of Dispensing Data are Employed in the Continual Reconciliation Method

Requirements of Regulation

"CITLD must be able to detect a leak at least 0.2 gallon per hour with a probability of detection of at least 95 percent and a probability of false alarm of no more than 5 percent."

CITLD must be able to detect a leak at least 0.2 gallon per hour with a probability of detection of at least 95 percent and a probability of false alarm of no more than 5 percent. Click To Tweet

The following must be performed on release detection equipment annually:

• Verification of the controller's system configuration
• Testing of alarm operability and battery backup
• Inspection of probes and sensors to detect possible residual build-up
• Inspections to ensure cables are break- and kink- free, shaft is undamaged, and floats are moving freely
• Recording of all these tests for a minimum of three [3] years

Leak Detection with 360Training.com

• Learn More About Leak Detection with 360Training.com
• Sign Up for the Illinois UST Class A/B Operator Training Course
• Designed for Operators to Teach Them How to Manage On-Site Operations and Maintain a UST Facility

Sources

https://www.epa.gov/sites/production/files/2016-05/documents/stot_5-2-16_final_508.pdf