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Exloc Instruments: your one-stop-shop for instruments and electrical equipment for use in hazardous classified locations.
Saving you time & money solving challenging problems! |
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Static Grounding for Type C FIBC "Big Bags" in Hazardous Locations
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Earth-Rite FIBC
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| 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:
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. |
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System Operation
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| 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. |
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You may also be interested in these related products:
multipoint static control systems • road tanker loading • self testing static control clamps, cables & monitors • shoe testing stations |
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