Application of Static Grounding Monitoring System
Issuing time:2022-04-28 15:20
Legislation concerning static electricity in hazardous area process industries
The ignition risk posed by static electricity is addressed in European and North American legislation. In the US, the Code of Federal Regulations that addresses hazardous location activities, 29 CFR Part 1910 "Occupational Safety and Health Standards", states that all ignition sources potentially present in flammable atmospheres, including static electricity, shall be mitigated or controlled.
In Europe, Annex II of the ATEX Directive 2014/34/EU states the following:
Section: 1.3.2 Hazards arising from static electricity: Electrostatic charges capable of resulting in dangerous discharges must be prevented by means of appropriate measures so "electrostatic discharges" are a known potential ignition source and must be considered as part of the explosion risk assessment.
Safety directives and function safety
Anti-spill and electrostatic grounding systems loaded on tank trucks shall comply with the ATEX directives and standards. The system meets the general requirements of EN60079-0, EN60079-1 and EN60079-11 for intrinsically safe circuit boards and electric equipment.
ATEX specifies minimum safety requirements for use in explosive atmospheres.
Its purpose is to ensure that equipment such as oil spill sensors and control monitors do not pose an ignition risk in an explosive atmosphere. ATEX does not assess the safety function of the system, that is, its ability to detect liquid product and stop the flow of product.
Function safety standards focus on the ability of a system to properly perform its safety function, that is, to detect hazards and implement automatic protections to ensure that in the event of a fault, the system fails in a predictable and safe manner. Accredited functional safety bodies should carry out functional safety certification to provide an unbiased assessment of the design and performance of safety systems.
Every year in the world, many oil depots and gas stations explode and catch fire due to improper operation of operators. Therefore, it is essential to strengthen operator training in flammable and explosive areas and should not be ignored. Operators working in EX/HAZLOC areas should be trained in the basics of electrostatics!
They should be trained on the intended function and proper use of grounding equipment and the use of grounding equipment in accordance with company standard operating procedures. For example, when loading and unloading oil into metal barrels, many operators do not directly ground the metal barrels, and directly start the process of paying and unloading oil. In this process, a large amount of static electricity will be generated and cause accidents.
Operators should be trained to avoid the following situations:
For example, if the grounding system and process interlocks have their ground connections removed from the process, thereby initiating an emergency shutdown process (e.g. switching down a pump), there may still be movement of material after the machine is stopped, thereby assuming the risk of continued electrostatic charge generation. If operators notice equipment has been changed or damaged (e.g. frayed cable connections), they should be encouraged to report the matter to the relevant personnel location (line manager, local maintenance staff) until someone who is able to use the equipment believes the equipment is safe and appropriate to use. Failure to provide training risks improper use of grounded equipment and/or failure to follow company standard procedures regarding static control.
Before the installation of our equipment, we will provide professional guidance to the on-site operators, and return visits regularly to supervise their normal operation.
1. Road tanker truck flammable
2. Filling, mixing and blending of flammable/combustible materials in drums, portable containers, mobile tanks and railcars.
3. Railway loading and unloading, etc.