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Static Grounding for Type C FIBC "Big Bags" in Hazardous Locations
Illustration of an FIBC big bag with static grounding control using an Earth-Rite FIBC system. Photo of a Newson-Gale Earth-Rite FIBC static control monitor with cable and clamp for use in hazardous classified locations.
Earth-Rite FIBC
  • Insures correct grounding
  • Checks bag dissipative condition
  • Includes interlock control contact
  • Intrinsically safe
  • FM approved Cl I II III, Div 1, Grp A-G
  • ATEX certified
  • LED status indication
  • Self testing
  • Suitable for other static dissipative containers
Mark of certification to ATEX Directive 94/9/EC
Mark of Factory Mutual approval
PROBLEM: The use of Flexible Intermediate Bulk Containers (FIBCs) has grown with the worldwide transportation of powdered, flaked and granulated products. While this has increased productivity and efficiency, it has also created a safety issue involving the dangerous build up of electrostatic charges during FIBC filling and discharging.

As the FIBC is filled there is a steady accumulation of static charge which may result in spark discharges from the surface of the FIBC, or charging of adjacent isolated conductors by induction. This may in turn provide sufficient energy for ignition of flammable vapours and suspended dust, as well as dangerous physiological shocks.

Type C "anti-static" or "conductive" bags minimize the risk by the use of either interwoven conductive threads or other static dissipative materials.The container is then earthed/grounded using one or more clamps attached to designated tags, enabling static charges to dissipate.
Even when Type C FIBCs are used, questions remain:
  • Has the operator correctly fitted the clamp(s) and effectively grounded the bag?
  • Has the bag lost some of it's anti-static properties through damage or wear and tear?
  • Is the operator using the correct FIBC type?

SOLUTION: The Earth-Rite FIBC system can check that Type C anti-static FIBCs have the correct static dissipative qualities and are correctly grounded/earthed. A relay contact is provided to create a safety interlock in the event that these conditions are not met.

To suit different installations the system can be configured to either monitor resistance between the lifting loops and one clamp with respect to ground, or between two separate clamps with respect to ground. The system is FM approved intrinsically safe for use in all hazardous (classified) locations, and ATEX certified.

Schematic diagram of an FIBC bag prtected by a Newson-Gale Earth-Rite FIBC static control system.
System Operation
The system utilises a stainless steel monitoring clamp which should be attached to the conductive ground loop of the FIBC. This clamp is connected via a chemical and abrasion resistant Hytrel-coated spiral cable and forms the monitoring connection so that the resistance through the bag and down to ground can be monitored. The static dissipation path is provided by the lifting hooks which should be bonded to ground.

If the lifting hooks cannot be used for grounding, the system verifies the resistance between the monitoring connection and an additional connection to ground. The system also provides a visual indication of ground condition via red/green LEDs.

The system interlock will permit product transfer circuit only when the resistance through the container is within the range of 500 ohms to 100 megohms. If customers are using non-standard FIBC bag types, or have their own safety standards, alternative resistancemeasuring ranges may be supplied to special order.

Earth-Rite FIBC Basic Specification
Approvals & Certification Factory Mutual: Cl I Div 1 Grps A-D; Cl II Div 1 Grps E,F,G; Cl III Div 1
ATEX: EEx ia IIC T4; exlosion proof power supply option: EEx d IIB T5
Clamps Body material: stainless steel
Body length: 4.27"/108mm
Cable Hytrel coated spiral single conductor cable, fitted with in-line quick-connects.
Monitored Resistance 500Ω to 10mΩ standard, other ranges to specail order.
Status Indication Red / green LED indication.
Power Supply AC powered version: 110/120V or 220/240V AC 50-60 Hz
Output Relay Contact One voltage free switch contact, 240VAC, 4A, resistive load
Earth-Rite FIBC Available Models
USA Version EMFU01U Earth-Rite FIBC System, 110/120 VAC.
USA Version EMFU01U/230 Earth-Rite FIBC System, 220/240 VAC.
ATEX Version EMUF01 Earth-Rite FIBC System, 220/240 VAC.
ATEX Version EMUF01/110 Earth-Rite FIBC System, 110/120 VAC.
ATEX Version EMUF02 Earth-Rite FIBC System, 220/240 VAC, with explosion proof power supply.
ATEX Version EMUF02/110 Earth-Rite FIBC System, 110/120 VAC, with explosion proof power supply.
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This page last updated 6/24/11. ©2004–2011 Exloc Instruments, Inc. All rights reserved.