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N Guide Specifications —..-Hvdrostatic. Monii. Part 1: General The monitoring liquid may be: salt brine(30%CaCl n 1.0 The tank manufacturer shall supply a continuously moni- water). tored hydrostatic head pressure leak detection system, The The probe shall detect and report a change in liqui( level system shall be designed by the manufacturer to detect a either above(high-alarm point)or below(low-alarrr point) leak in either the primary tank or the secondary tank in the neutral level established during the initial filling ind sub- either a wet or dry excavation. sequent maintenance of the system. The probe sha not The system shall include:a brine solution (to prevent freez- operate by inducing an electrical current into the lic uid ing) delivered to thejob site in the interstice of the double medium that is being monitored. wall tank, a reservoir mounted on top of the tank to provide The sensing range represents a built-in allowance f r pres- a liquid medium for monitoring, and an electronic mQnitor- sure and thermal variation. Until the liquid level exceeds the ing system to sound an audible and visual alarm when the allowable variation, the probe shall not send a signal to the liquid level of the reservoir rises or falls to predetermined monitor unit. alarm points.The system shall also include an electronic sensing probe to monitor the attached collar riser for the The probe shall be capable of being mounted in the reser- submersible pump, if so specified. voir in a manner that allows adjustment of location, The probe must be able to be mounted so that normal fluctua- tions of the liquid level do not interfere with the normal Part II: Standards operation of the probe. 2.0 The double wall tank with a brine-filled interstice shall be list- The probe shall be capable of operating at a distance of 500 ed by Underwriters Laboratories.The electronic monitoring feet from the control panel. system used to monitor the liquid reservoir and the attached 4.2 Attached Collar Riser Probe collar riser shall also be listed by U.L. for intrinsic safety in a (if applicable and shown on the drawing) hazardous location. The probe shall be constructed of a material that is suitable All equipment shall be installed in accordance with the man- for prolonged, complete immersion in any of the fluids listed ufacturer*s instructions and all applicable federal, state, and in U.L. Standard for Safety 13 16, Table 14.1, all columns local laws and regulations. The probe shall detect the presence of liquid in the riser when the liquid level has risen to a maximum of one inch above the bottom of the probe, as located in its permanent Part III: Requirements for mounting position. The permanent mounting position is Liquid-Filled Double Wall Tank determined by the installer at the time of installation 3.0 The interstice of the double wall tank shall be filled with a The probe shall be capable of being mounted in tle riser in brine solution, Tanks up through 30,000 gallons shall be a manner that allows adjustment of location. The probe delivered to the site with the brine solution in the inter- shall be able to be mounted so that an increase in the liquid stice. The reservoir shall be constructed of fiberglass and level does not interfere with the normal operation of the mounted directly to the top of the tank. The reservoir shall probe. be fitted with one 4" NPT fitting for installation of the The probe-mounting assembly supplied and installed by electronic-reservoir probe. contractors shall provide protection for the probe from the operational activities that may take place within the riser The probe shall be capable of operating at a distance of 500 Part IV: Requirement for the feet from the control panel. Electronic Monitoring System 4.3 Operating Parameters: 4.0 The Controller Temperature: 00 F to 1500 F The panel shall receive the signal from the reservoir and/or Voltage: I 10 or 220 VAC, 50/60 Hz attached collar riser and provide for the following indications: I System normal Part V: Performance 2. System fault(The"fault"indication must not be the same 5.0 The continuous hydrostatic-monitoring system, including the as the"alarm"indication.) electronics and the probes, shall be capable of detecting 3 System leak alarm and alarming when the liquid level in the tank reservoir rises Also. a system-test switch indicating the system is functional or drops beyond the allowable variation. snail be provided. All alarms shall be both audible and visible. Part VI: Materials The unit shall be able to be reset, 6.0 The materials used in the monitoring system shall be The control panel shall provide indication of which tank is in corrosion resistant to the liquid used to fill the interstice the alarm condition, if more than one tank is being moni- [ored. The control panel shall be capable of monitoring up to eight Part VII: Installation probe points. 7.0 The monitoring systems shall be installed in accorc ince with The system shall provide intrinsic safety at the probe locations: the manufacturer's installation instructions, and all �pplicat)le 4.1 Reservoir Probe federal, state, and local laws and regulations. The probe shall be constructed of a material which is suitable for prolonged, complete immersion in the monitoring liquid. 17