Chemical Industry (Chemical Plant,Oil Storage）

Successful Cases of Copper Clad Ground Wire in Chemical Industry

Case	Relation products
Sinopec Ningbo Engineering Company	Exothermic welding powder,groundr od, copper clad steel wire, resistance reducing agent
Sinopec ZRCC	Exothermic welding powder, ground rod, resistance reducing agent
Sinopec Tenth Construction Co.,ltd	Exothermic welding powder, ground rod, Copper clad steel wire
Zhejaing Shaoxin Sanyuan Petrochemic co.,ltd	Exothermic welding powder, ground rod, Copper clad steel wire,Busbar
CNCEC(3rd )	ground rod, Copper clad steel wire
CNCEC(6th)	ground rod, Copper clad steel wire
Guangdong Petrochemical Construction Group Corporation	Chemical ground eletrode syste, grounding rod, exothermic welding powder, ground rod
China National Offshore Oil Corporation	Exothermic welding powder, ground rod and Couplings
Sinopec Maoming Branch	Copperclas steel tape, exothermic welding flux, copper bonded ground rod
PetroChina Fushun Petrochemical	Earth rod,calwld powder, CCS TAPE
Daqing Oilfield	Copper coated earth rod, and clamps. welding powder, mold
Ningbo Daxie Mitsubishi Chemical	Copper coated earth rod, and clamps. welding powder, mold, CCS Wire

Chemical Ground Electrode System

To make reliable connection of the leakage of electrical appliances with the conductive part
of the grounding device and earth is absolutely crucial in grounding system. Grounding resistance is a direct reflection of the lightning protection grounding is an important indicator of compliance with regulatory requirements. As for the grounding device, it is better for the smaller the grounding resistance. Because the smaller the grounding resistance, the faster the dispersion, the faster the step voltage, the smaller the ground voltage. The main factors affecting the grounding resistance are soil resistivity, the type of grounding body, size, shape and burial depth, grounding wire and grounding body connection. Among them, soil resistivity and grounding body plays a decisive role in the size of grounding resistance. In order to protect the safety of chemical enterprises, to prevent electromagnetic coupling interference; to prevent strong lightning strikes power distribution equipment and instrumentation, etc. caused by personal injury, to ensure smooth production, electricity system must be well grounded.

How to install chemical ground electrode system in chemical plants

1. The non-electric metal body in the use of facilities for flammable and explosive places, such as ball mills, sieving machines, granulators and other equipment on the metal parts, should be direct electrostatic grounding, grounding resistance value should be less than 10Ω, in mountainous areas and other areas of high soil resistivity, grounding resistance value should not be greater than 1000Ω.
2. Direct electrostatic grounding line can be used in the three-phase five-wire power supply system PE line, but is strictly prohibited to use the three-phase four-wire power supply system in the zero line.
3. Direct electrostatic grounding line can be used to ground the equipment or induction lightning grounding line, but is strictly prohibited to use the grounding line against direct lightning.
4. In flammable and explosive places, the workbench and workplace floor should be paved with anti-static materials, anti-static material grounding resistance value should be in the range of 104-109Ω.
5. The anti-static material on the workbench should be grounded through the metal conductor, when the anti-static material is connected to the grounding conductor, its close contact area should not be less than 20 square centimeters.

Petrochemical enterprise pipeline electrostatic grounding range of chemical ground electrode

Pipeline electrostatic grounding design is not easy to attract attention to what needs to be electrostatic grounding designers, builders often lack a clear and clear definition, the usual practice is based on past project experience. Can not deny the experience in the project preparation and implementation process is very important, but experience, but also need to be screened. A project in defining the scope of the need for electrostatic grounding, there is a great controversy, the mainstream view that the pipeline should be defined by the medium of electrostatic grounding, that combustible media, oxygen, gas-solid pipelines need electrostatic grounding, while other pipelines such as air pipelines, nitrogen, etc., because the medium is not combustible, do not need to be grounded, steam, boiler water, circulating water, etc., because the medium conductive, also do not need to be grounded. These views are certain problems, if this viewpoint to define the scope of electrostatic grounding of the pipeline, there is a risk. Define the electrostatic grounding range of the pipeline should be based on the explosion and fire hazard area division, combined with the pipeline media to determine.

The scope of the pipeline electrostatic grounding in chemical ground electrode

The following pipelines should be electrostatically grounded.
(1) Pipelines located in the explosion and fire hazard zone should be electrostatically grounded. In the explosion and fire hazard zone, there may be combustible gas and combustible dust collection, if the generation of electric sparks, may cause fire or explosion accidents. Both strong and weak electrical facilities in the explosion and fire hazard zone need to be explosion-proof, which is to prevent point sparks from being generated during the use of electrical facilities and igniting or detonating combustible gases or combustible dust. If the explosion and fire hazards within the pipeline can not be well grounded, static electricity gathered to a certain extent to generate electricity and sparks, may cause a fire or explosion accident.
(2) oxygen pipeline should be electrostatic grounding. Oxygen is a special medium, which itself does not burn, but is a strong oxidizer, in the environment of pure oxygen, the steel pipe itself can be ignited. Therefore, although oxygen is not a combustible medium, but the pure oxygen pipeline must be well grounded.
(3) gas-solid pipeline should be grounded electrostatically. Gas-solid pipeline will generate a lot of static electricity during operation, and must ensure that the pipeline is well grounded to quickly transfer the charge and prevent a large amount of static electricity from collecting.
(4) parallel laying of the pipeline, the net distance is less than 100, should be every 20m, set electrostatic span. Close parallel laying of the corridor, in order to ensure that the two pipeline equipotential, need to set up every 20m span.
(5) pipeline in and out of the device boundary area should be electrostatic grounding, to prevent the transfer of charge between the pipeline outside the boundary and the pipeline inside the device.

The way of pipeline electrostatic grounding in chemical grounding system

The way of pipeline electrostatic grounding is divided into two kinds of direct grounding and indirect grounding. Direct grounding, that is, the pipeline electrostatic grounding set directly connected to the device trunk grounding network; indirect grounding, refers to the pipeline through and has been grounded equipment or steel structure connection, indirectly connected to the device trunk grounding network. All of the equipment is set up with electrostatic grounding, and all of the pipeline is connected to the equipment, the vast majority of the pipeline is indirectly grounded. However, when the grounding resistance of the pipe system is greater than 100 ohms, a separate grounding should be set. The piping system is usually indirectly grounded, and the work of piping grounding is mainly in the electrostatic cross-connection of non-welded connections in the piping system. These parts that need to be considered for electrostatic cross-connection include.
1) Flanged or threaded connections between metal piping and piping.
2) Flanged or threaded connections between metal piping and equipment piping.
3) flanges or threaded connections between metal piping and valves
4) flange or threaded connection between metal piping and instrumentation
5) flanges or threaded connections between metal pipes and special pieces
6) flange connections between valves and special fittings, equipment orifices and instruments.