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Wednesday, June 02, 2004 11:40 AM Art Gomez 510-494-1596 p.17 i i ti s Hydrostatic Monitoring Part I: General The probe shall detect and report a change in liquid 1.0 The tank manufacturer shall supply a continuously mon- level either above(high-alarm point)or below(low-alarm itored hydrostatic head pressure leak detection systempoint) the neutral level established during the initial The system shall be designed by the manufacturer to filling and subsequent maintenance of the system. detect a leak in either the primary tank or the secondary The probe shall not operate by inducing an electrical tank in either a wet or dry excavation, current into the liquid medium that is being monitored. The system shall include: a monitoring fluid in the The sensing range represents a built-in allowance for interstice of the double-wall tank, a reservoir mounted pressure and thermal variation. Until the liquid level on top of the tank to provide a medium for monitoring, exceeds the allowable variation, the probe shall not and an electronic monitoring system to sound an send a signal to the monitor unit. audible and visual alarm when the liquid level of the The probe shall be capable of being mounted in the reservoir rises or falls to predetermined alarm points. reservoir in a manner that allows adjustment of location. Part II: Standards The probe must be able to be mounted so that normal fluctuation of the liquid level does not interfere with the 2.0 The double-wall tank with a brine-filled interstice shall be normal operation of the probe. listed by Underwriters Laboratories (UL).The electronic The probe shall be capable of operating at a distance of monitoring system used to monitor the liquid reservoir 500'from the control panel. and the attached collar riser shall also be listed by UL for 4.2 Attached Collar Riser Probe intrinsic safety in a hazardous location. (if applicable and shown on the drawing) All equipment shall be installed in accordance with the The probe shall be constructed of a material that is manufacturer's instructions and all applicable federal, suitable for prolonged, complete immersion in any of state and local laws and regulations. the fluids listed in Underwriters Laboratories(UL) Part III: Requirements for Standard for Safety 1316,Table 14.I,all columns. Liquid-Filled Double-Wall Tank The probe shall detect the presence of liquid in the riser 3.0 The interstice of the double-wall tank shall be factory- when the liquid level has risen to a maximum of one filled with a monitoring fluid.The reservoir shall be inch above the bottom of the probe, as located in its constructed of fiberglass and mounted directly to the permanent mounting position.The permanent mount- top ounttop of the tank. The reservoir shall be fitted with one ing position is determined by the installer at the time of 4" NPT fitting for installation of the electronic-reservoir installation. probe. The reservoir must remain vented at all times. The probe shall be capable of being mounted in the Part IV: Requirements for riser in a manner that allows adjustment of location. The probe shall be able to be mounted so that an Electronic Monitoring System increase in the liquid level does not interfere with the 4.0 The Controller normal operation of the probe. The panel shall receive the signal from the reservoir The probe-mounting assembly supplied and installed by and/or attached collar riser and provide for the contractors shall provide protection for the probe from following indications: the operational activities that may take place within the 1. System normal riser. 2. System fault(The"fault"indication must not be the The probe shall be capable of operating at a distance of same as the"alarm" indication.) 500'from the control panel. 3. Systern leak alarm 4.3 Operating Parameters: Also, a system test switch indicating the system is Temperature: 0°F to 150° F functional shall be provided. Voltage: 110 or 220 VAC, SO/60 Hz Al alarms shall be both audible and visible. Part V: Performance The unit shall be able to be reset. 5.0 The continuous hydrostatic monitoring system, The control panel shall provide indication of which tank including the electronics and the probes, shall be is in the alarm condition, if more than one tank is being capable of detecting and alarming when the liquid level monitored. in the tank reservoir rises or drops beyond the allowable The control panel shall be capable of monitoring up to variation. eight probe points. Part VI: Materials The system shall provide intrinsic safety at the probe 6.0 The materials used in the monitoring system shall be locations. corrosion-resistant to the liquid used to fill the interstice. 4.1 Reservoir Probe Part VII: Installation The probe shall be constructed of a material which is 7.0 The monitoring system shall be installed in accordance suitable for prolonged, complete immersion in the with the manufacturer's Installation Manual and monitoring liquid. Operating Guidelines, and all applicable federal, state The monitoring liquid may be: salt brine (30% CaCI in and local laws and regulations. water.