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r PEURM200-17 storage system is releasing product to the outside of the primary containment in an uncontrolled manner. Leak detection methods include inventory control, tank and line testing, and interstitial monitoring. Leak detection is also known as "release detection." 2.16 Lockout/Tagout. Procedures designed to safe- guard workers from exposure to electrical hazards, the unexpected startup of machinery, or the release of fuel while equipment is being serviced. This requires, in part, that a designated individual turns off and isolates the equipment from its energy source(s) before performing service or maintenance. The designated individual either locks or tags the breaker(s) or valve(s) and takes steps to verify that the equipment has been isolated effectively. 2.17 Overfill Alarm. An audible and/or visual warning device that alerts a fuel delivery operator that a storage tank is nearly full and the delivery should be stopped. 2.18 Penetration Fitting. A fitting designed to provide a liquid -tight seal around piping or conduit that passes through the wall of a containment sump. 2.19 Personal Protective Equipment (PPE). Equip- ment designed to protect workers from workplace inju- ries or illnesses resulting from contact with chemical, physical, electrical, mechanical or other workplace haz- ards. Examples of PPE include safety shoes, hard hats, safety glasses, coveralls, gloves, high -visibility vests, hearing protection and respirators. 2.20 Probe. An electronic measuring device installed in an underground tank. Probes typically measure product level, water level and product temperature, and commu- nicate this information to an ATG console. 2.21 Riser. A generic term for a vertical length of pipe in an underground storage system. Risers include: • fill, vapor recovery, tank gauge and interstitial risers located on the top of the tank; • fuel dispenser risers located beneath fuel dispensing equipment; • vent risers that extend above grade to allow an under- ground tank to exhaust vapors or take in fresh air as necessary to maintain the tank at or near atmospheric pressure. 0 pei.org 2.22 Safety Data Sheet (SDS). Information supplied by the manufacturer of chemical substance to individuals who use or come into contact with the substance. The SDS includes information on how to use, transport and store a chemical safely, as well as what to do in case of emergency. 2.23 Sensor. An electronic or mechanical device that can detect the presence of water, liquid product, product vapors or a loss of pressure or vacuum in the interstitial space of a tank, piping, a tank -top sump, a fuel dispenser sump or an observation well. Sensors are available to detect only water, only petroleum products, or to detect both water and petroleum products and differentiate between the two. 2.24 Shear Valve. A mechanical device installed at the base of a fuel dispenser when the fuel supply piping oper- ates under pressure. The valve is designed to automati- cally shut off the flow of fuel to the dispenser in the event of a severe impact to the fuel dispenser or a fire inside the fuel dispenser. This device is also known as a "crash valve," "impact valve" or "emergency shutoff valve." 2.26 Spill Bucket. A liquid -tight container placed around the fill pipe or Stage I vapor recovery riser of a UST designed to capture small spills that might occur when the delivery hose is disconnected. A spill bucket may contain a drain valve to drain liquids into the tank or a small pump to remove liquids. Also referred to as a "spill catchment basin." 2.26 STP. See "Submersible Turbine Pump." 2.27 Submersible Turbine Pump. A pumping unit located inside a UST designed to supply fuel to one or more fuel dispensers. The pump intake is positioned approximately 4 to 6 inches from the bottom of the tank, where it is submerged in the fuel. A submersible turbine pump may also be called a "submersible pump" or an "STP" 2.28 Test Boot. A donut- or tube -shaped device made of flexible material that can be used to seal off the inter- stitial space in a double -walled piping system. With the test boot in place, the interstitial space of the piping can be isolated for integrity testing purposes.