Release Detection and Leak Monitoring
What this domain covers
Release detection answers one question every month: is anything escaping? The exam tests methods, thresholds, frequencies, and how you react to an alarm.
Core rules and concepts
- Tanks and piping need release detection; a single method rarely covers both, so know the pairing on the site.
- Tank methods include automatic tank gauging, interstitial monitoring, statistical inventory reconciliation (SIR), manual inventory control paired with periodic tightness testing, and groundwater or soil-vapor monitoring. Tank tightness testing typically uses a 0.1 gph threshold.
- Pressurized piping needs a line leak detector with an annual 3.0 gph operability test, plus either an annual 0.1 gph line tightness test or monthly 0.2 gph monitoring.
- Monitoring is monthly (or at the method's stated interval); records are commonly kept three years.
- Every alarm gets a written response: check for a delivery, check temperature effects, verify the equipment, and escalate if the condition repeats.
Worked example
An ATG alarms at 0.2 gph the morning after a cold product delivery. Cold product contracting in the tank mimics a loss. The operator confirms the delivery volume and time, waits for the product to stabilize, and re-runs the test. If the alarm returns with no delivery and stable temperature, it is a suspected release and is reported and investigated.
Traps that cost marks
- Assuming the ATG satisfies piping monitoring.
- Skipping the annual line leak detector test.
- Using inventory control alone without the paired tightness test.
- Reading "every 30 days" as "once a month, whenever convenient."