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i Monitoring the Double Wall Tank Effective Hydrostatic Monitoring Systems for Xerxes' Double Wall Tanks Xerxes double wall tanks may be monitored with a variety of systems. Each monitoring mode—depending on the economics of the installation—is designed to detect a leak in either the primary or secondary tank as well as the attached manway rises With a Xerxes supplied electronic.tank monitoring system, your installation is continuously "watched" to safeguard the integrity of your installation for safe, long-term containment Should your installation require maximum round-the-clock monitoring of tanks and attached manway risers, the single control unit is pre-programmed to effectively monitor up to a four -tank installation, with a four channel control panel. (An eight channel control panel is available as an option.) Control Piping Sump Typical three -tank installation with control panel individually monitoring the attached manway risers and tanks. Controller/ Monitor The control unit provides LED's (indicator lights) to show the individual operating condition of each tank and riser in the installation. The unit is also equipped with an audible alarm and may be located up to 500 feet from the installation. Control Unit (4 channel shown) mrd Power (green)—The system is operating property. a Fault (yellow) —The system has an internal malfunction. , —•- Alarm Ired) —The alarm light, plus an audible warning, will indicate that one or more of the sensors q 9 9 Q is in an alarm condition. (8 channel unit also available.) The controller is also equipped with a test switch to prove the system functional, The control panel is weather resistant. The Xerxes supplied Electronic Monitoring System is listed by Underwriters' Laboratories, Inc. (U.L.). The monitor probes for the reservoir and riser sensors are intrinsically safe for use in hazardous locations Class I, Group C and D, Div. 1 and 2 as defined by the National Electrical Code. 11 Monitoring the Tank with the Reservoir Probe The accurate monitoring of the primary and secondary tank walls is accomplished through the use of an electronic sensor' ` and the tank -mounted hydrostatic reservoir. Cable Clamp Bushing Standpipe & cap CableQ_� Junction Box �'?� 4" NPT Fitting Reservoir Probe 7S JL Liquid Reservoir —..� j '\.I of Level With a standpipe affixed to the top of the reservoir, the sensor, a liquid level sensing unit, is located in the reservoir. With the interstitial space and reservoir factory filled with liquid to a predetermined level, a hydrostatic pressure is applied to the inner and outer tank walls. If a leak should ever occur in the inner tank, the liquid level in the reservoir will drop as monitoring fluid drains into the primary tank. Should a leak develop in the outer wall, the monitoring fluid will drain into the excavation and again lower the level of monitoring fluid. Should a leak occur in the outer wall during high ground water conditions, the level of the monitoring fluid will rise as outside water seeps into the interstitial space. In any of these situations, a change in the liquid level beyond the acceptable limits will activate the alarm. Monitoring the Attached Manway Riser The optional attached manway riser provides containment for leakage from the submersible pump. And, should double wall piping be used, a leak in the primary piping will drain to the attached manway riser. ,Function Bol Cab Sump Prol icer ouble Wall ps