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Leak Detection For Underground Piping

Your UST may have suction piping or pressurized piping. Leak detection requirements for piping differ somewhat from those for tanks. Leak detection methods for piping include secondary containment with interstitial monitoring, vapor monitoring, groundwater monitoring, statistical inventory reconciliation, and tightness testing. Pressurized piping must also have an automatic line leak detector.

What are the regulatory requirements for suction piping?

The line tightness test must be able to detect a leak at least as small as 0.1 gallon per hour with certain probabilities of detection and of false alarm.

Interstitial monitoring, vapor monitoring, groundwater monitoring, and statistical inventory reconciliation have the same regulatory requirements for piping as they do for tanks. See the Leak Detection Requirements Table for more information.

What are the regulatory requirements for pressurized piping?

Each pressurized piping run must have one leak detection method from each set (A and B) below:

A. An Automatic Line Leak Detector: B. And One Other Method:

How do the leak detection methods for pressurized piping work?

Automatic line leak detectors (LLDs)

Line tightness testing

Secondary containment with interstitial monitoring Vapor or groundwater monitoring

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