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Recommended Practices for the Testing and Verification of Spill,Overfill,Leak Detection and Secondary Containment Equipment at UST Facilities 2.6 Classified Area. A general term for a location 2■ DEFINITIONS where fire or explosion hazards may exist due to the presence of flammable gases,flammable liquid-produced When used in this document, the terms listed below have vapors or combustible liquid-produced vapors.Classified the following meanings: areas are described in national fire and electrical codes. For example, see the definition for Class I,Division 1 in 2.1 Appropriate Person. The individual or organi- this chapter. zation designated by the facility owner or operator to receive notification of any problems or defects noted 2.7 Containment Sump. Aliquid-tight container that during any routine inspection procedure described in protects the environment by containing leaks and spills this recommended practice. It is the responsibility of the from piping,dispensers,pumps and related components. "appropriate person"to assess the nature of the problem Containment sumps may be single-walled or double- or defect and initiate appropriate action. walled. Typical locations include the top of a tank (fill sump or submersible turbine pump sump),underneath the 2.2 Authority Having Jurisdiction (AHJ). An orga- dispenser (under-dispenser sump), or at other points in nization, office or individual responsible for enforcing the piping run(transition or intermediate sump). the requirements of a code or standard, or for approving equipment,materials,an installation or a procedure. 2.13 Discriminating Sensor. See"Sensor." 2.3 Automatic Tank Gauge (ATG). An electronic 2.9 Dispenser Sump. See"Containment Sump." device that consists of a probe that measures liquid level 2,10 Drop Tube. A tube installed in the fill pipe of a and a console that calculates the liquid volume in that UST that extends from the top of the fill pipe to within underground storage tank (UST). By monitoring the 4 to 6 inches of the bottom of the tank. The drop tube liquid level,the ATG can conduct leak tests of the under- increases the delivery flow rate and reduces the volume ground tank.Accessory devices that monitor pressurized of vapors generated during a delivery. piping,interstitial spaces and containment sumps also can be connected to the ATG console. 2.11 Drop Tube Shutoff Valve. A mechanism installed in a drop tube designed to prevent the overfill of a UST 2.4 Ball Float Valve. An overfill prevention device by shutting off product delivery when the tank is nearly that operates by restricting the vent opening in a UST, mil.Drop tube shutoff valves are frequently referred to as thus limiting the flow of fuel into the tank. "flapper valves." 2.5 Class I, Division 1. Part of a classification system 2,12 Emergency Stop. A clearly identified switch or used in the National Electrical Code(NFPA 70)published button that disconnects all power to dispensers, pumps by the National Fire Protection Association (NFPA) to and electrical equipment in the area surrounding fuel describe the fire or explosion hazard present in a specific dispensers.The switch or button may be inside or outside area.A Class I,Division 1 area is a location where flam- a building.Also known as an"E-Stop,""emergency shut- mable gases, flammable liquid-produced vapors or com- off switch"or"ESO." bustible liquid-produced vapors: • can exist at ignitable concentrations under normal 2.13 Interstitial Space. The area between the primary operating conditions; and secondary containment of a double-walled tank, double-walled piping or other double-walled component. • may frequently exist at ignitable concentrations Also known as the"interstice" or"annular space". because of repair or maintenance operations or because of leakage; 2.14 Intrinsically Safe Circuit. A circuit in which any spark or thermal effect is not capable of causing ignition • might be released in ignitable concentrations by of a mixture of flammable or combustible material under the breakdown or faulty operation of equipment or prescribed test conditions.In general,an intrinsically safe processes that might also cause the simultaneous circuit is a low-energy electrical circuit that cannot gener- failure of electrical equipment. ate enough heat or produce a spark large enough to ignite For example,the area inside a fuel dispenser that contains fuel vapors. product piping and most spaces beneath the access covers 2.15 Leak Detection. Any procedure or equipment of a UST are Class I,Division 1 areas. that can be used to determine whether an underground pei.org 0