What is electrostatic protection? What are the protective measures?
Admin:EMP Date:2023-04-15 Browse:195

Static electricity protection refers to the protective measures taken to prevent explosion accidents caused by static electricity in oil receiving containers connected to pipeline terminals. The static electricity in the petroleum industry is mostly generated by the flow of oil products in pipelines. When oil products flow along the pipeline, the pipe wall carries a polar charge, while oil products carry opposite polar charges. Under the same flow conditions, oil products with a conductivity within the range of 1-10pS/m, such as gasoline, coal, diesel, etc., will carry more charges. There is generally no danger of electrified oil in pipelines, but when charged oil enters the receiving container, a potential difference is formed between the oil surface and the container shell filled with oil vapor. When the potential difference is sufficient to cause discharge, it can ignite the oil vapor and cause deflagration.

Try to eliminate the main factors that generate static electricity (such as the characteristics of the object, surface state, charging history, contact area and pressure, separation speed, etc.) as much as possible; Make the positions of objects in contact with each other in the charged sequence as close as possible; Keep the contact area and pressure between objects small, the temperature low, the number of contacts small, the separation speed small, and the contact state not changing rapidly. During transportation, powder, liquid, and gas may generate static electricity due to friction. Therefore, measures should be taken to limit flow velocity and reduce pipeline bending. Measures such as increasing diameter and avoiding vibration.

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In addition to reducing speed, pressure, friction, and contact frequency, selecting appropriate materials and shapes, and increasing conductivity, static electricity protection can also take the following measures:

① Grounding.

② Overlapping (or bridging).

③ Shielding.

④ Use antistatic agent for insulators that can hardly leak static electricity to increase conductivity and make static electricity easy to leak.

⑤ Use spray, watering and other methods to improve the environmental humidity and inhibit the generation of static electricity.

⑥ Use an electrostatic eliminator to neutralize static electricity.


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