Active Floating Roof Tank Monitoring System

The GroundGuardian® active floating roof tank monitoring system, developed by ALLTEC, alerts you to resistive changes in your roof-to-shell bond, maintaining a safe work environment and reducing risk.

  • Uses patented, innovative active monitoring technology to detect any change in electrical bond resistance between a floating roof and the storage tank’s grounding system

  • GroundGuardian® continuously monitors the established ground loop for dangerous deviations–commonly caused by corrosion, wax accumulation, or breakage–in the bond resistance between the floating roof and the external floating roof tank (EFRT)’s grounding shell

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Oil & Gas Application

Lightning is a constant danger to oil and gas facilities. Rim-seal fires are the most common type of fires for floating roof tanks, especially external floating roof tanks. Lightning can cause fires by generating incendiary sparks in any combustible vapor/air mixture present.

The innovative safety technology behind the GroundGuardian® floating roof tank monitoring system was featured in Process Engineering Control and Maintenance Magazine.

How it Works

  • GroundGuardian® monitor/alarm is housed in an ATEX rated flame and explosion proof metal enclosure suitable for hazardous environment installations such as External Floating Roof Tank (EFRT).

  • From the monitor/alarm’s Intrinsically Safe (IS) rated subsystem, current is passed to the optional Remote I/O Exclosure, which is rated for installation on the storage tank shell wall.

  • The Remote I/O Enclosure is attached to a self-retracting insulated Monitoring Reel with a bond to the tank’s floating roof and the EFRT’s earthing/grounding system.

  • A simple reference connection is made from the monitor’s supervisor circuit to the EFRT’s earthing/grounding system.

  • During conditions of less than 10 Ohm resistance, a steady green light will flash on the monitor’s front panel display.

  • When resistance exceeds 10 Ohms the GroundGuardian initiates an alarm state; two Dry Relay Contacts change state and the Red LED alarm on the front panel display lights up.

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GroundGuardian® Floating Roof Tank Monitor & Reel
Power Supply 110-120 V 50/60 Hz system (Supply voltage range: 108 V to 125 V)
220-240 V 50/60 Hz system (Supply voltage range: 216 V to 250 V)
Power Rating 12 Watt
Temperature Rating -25°C to +55°C
Enclosure Type KILLARK EXB-10106 N34, or equivalent for use in Class I, Groups B, C & D, Type 3 & 4, Class II, Groups E, F & G and Class III Hazardous locations, as defined by the Canadian Electrical Code and the National Electrical Code.
Weight 80 lbs (36.3 kg)
Construction Copper-free cast aluminum
Monitoring Circuit Intrinsically safe
Output Relay Contact and Rating 2 sets of voltage-free change over switch contacts (DPDT)
Relay contact maximum ratings (resistive load): 250 Vac, 5 A, 500 VA; 30 Vdc,2 A,60 W
Surge Protection Device DynaSheild® Model PT-RD-20-120V-30A or PT-RD-20-250V-30A
Fuse Size & Type 2 Fast Acting Glass Type
Environmental Safety CEI/IEC 68-2-52 Part 2, Severity 2 & per ASTM BB117-11: Passed Operational Testing – Salt Spray/Temperature &
Humidity Test
EN ISO 6988-1985(E): Passed Operational Testing – Humid Sulphurous Atmosphere Treatment Test