Piping release detection automatic leak detec

This equipment is installed on pressurized piping lines. Line
leak detectors (LLDs) must be able to detect large leaks of three
(3) gallons per hour (gph). Mechanical line leak detectors are
installed at the submersible pump head and usually work by
restricting the flow of product. Electronic line leak detectors
can be installed either at the pump head or at the dispenser and
work by detecting pressure increases or decreases that may
indicate leaks. Some electronic units are capable of performing
0.1 gph line tightness tests as well. Annual line tightness
tests are required if the line leak detectors do not have this
capability. All line leak detectors must be checked for proper
functioning at least annually. Records of these function checks
must be kept for at least ten (10) years.