It happened at least once to all to receive an electrostatic shock getting off the car and touching the door handle to close it. If we are...
It happened at least once to all to receive an electrostatic shock getting off the car and touching the door handle to close it. If we are not insulated from the ground (bringing rubber shoes), the static energy accumulated while standing on an insulated car discharges to earth through our body, coming into contact with the ground.
To prevent this phenomenon, it's possible to add to the car a conductive strip that, being always in contact with the ground, allows to instantly discharged the stored energy, thus avoiding the use of our body as the conduction element.
In potentially explosive atmospheres these phenomena occur during loading and/or unloading operations of vehicles that carry inflammable and explosives products, such as tank trucks for transport by road or LNG carriers for transport by sea.
For this reason, the grounding systems must be designed so as to ensure all the functionality of the system and, at the same time, guarantee the safety of operators in charge, in accordance with the compulsory regulations in that matter.
What can be the dangerous environments in which a grounding system is needed?
A. The loading/unloading bays tankers
B. The Jetty at sea, for the loading/unloading of oil tankers, gas tankers or gas carriers
C. Silos for liquid or solid products pouring
As an indication only, we give below the description of a typical operating sequence for loading/unloading of a tanker in the loading/unloading bay. After positioning the tanker under the loading/unloading shelter, proceed with the operational sequence of our grounding system GRD-4200 series, such as described below:
One of the peculiarities of our system is the special "clamp” that prevents the formation of sparkles in contaminated areas, thanks two "Ex d" micro chambers which avoids the spark propagation in the connection phase between the two systems.
This is obviously not enough to ensure a proper connection. For this reason, the electronics of our system is equipped with a protection and verify circuit that measures the resistance value and compares it with the parameter pre-set at the factory. If this value is within the range pre-set, it closes the electric circuit between the two equipotential systems.
This analysis allowed us to test the device by a certifying body, in order to obtain a certification responsive to safety requirements (SIL), in accordance with the relevant EN 61508 and EN 50495 standards, mandatory for the compliance with the minimum safety and health requirements for industries, including thus all the chemical and petrochemical.
We conclude this short essay saying that our grounding device, GRD-4200 series meets all functional and safety specifications required by the regulations for such operations and it is built to be installed in environments at risk of explosion due to the presence of gases and/or dusts. We recommend to operators to comply with all rules laid down in our Use and Safety Instructions always attached to our product.