When an ungrounded road tanker is being filled/emptied with a liquid or powder, the road tanker could accumulate enough static to pose a discharge risk.
To counteract this risk, it is important to ensure that the road tanker does not have the capacity to accumulate static electricity. The most practical and comprehensive way of achieving this is to make sure that the road tanker is at earth potential, especially before the transfer process starts.
This is because the general mass of the Earth has an infinite capacity to balance charges which in turn minimises the accumulation of static in the road tanker, and mitigates the generation and presence of voltages on the road tanker.
Using a grounding system can increase the safety and efficiency of the loading/unloading process by reducing the need to physically measure the bond between the earth bar and the road tanker to ensure it is in good condition.
Having a simple display coupled with education of the drivers/operators that they attach the grounding clamp as the primary function ensures repeatable reliability of use. When using a grounding system to ground and monitor the road tanker, a permissive state can clearly be indicated to the driver/operator by GREEN flashing LEDs whilst utilising interlock relays can assist in improving the safety of the loading/unloading process.