Static grounding of the external pipeline network in refineries and chemical plants
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Dear sea friends: Is static grounding necessary for the external pipeline network of refineries and chemical plants? I’ve seen quite a few of them; some are practical while others aren’t. What’s going on here?
There should be requirements, right? In my experience, things are usually grounded separately; I’ll wait for an expert to give a clear answer
Answer: Pipelines for combustible gases, liquefied hydrocarbons, combustible liquids, and combustible solids shall be equipped with static grounding facilities at the following locations: (1) For pipelines within each relatively independent building or structure in the plant area, static grounding can be achieved by connecting them to the metal enclosure of the process equipment (via flange connections)； (2) Grounding connection points should be provided at pumps, filters, buffers, etc., within the pipeline network ； (3) The pipelines in the pipeline network at the entrances and exits of the plant area, at the boundaries between different explosion-hazardous areas, and at pipeline junctions should be grounded; for long-distance pipelines without branches, they should be reliably connected to grounding electrodes every 80–100 meters ； (4) For the non-conductive sections in the middle of metal pipes (such as PVC pipes), in addition to shielding protection, the metal pipes at both ends should be connected to the grounding main line respectively, or connected together using 6mm² multi-core insulated copper wires before being grounded ； (5) Metal parts on non-conductive pipe sections shall be grounded. The grounding resistance value of the dedicated static grounding electrode in each group should be less than 100Ω ； In areas with high soil resistivity in mountainous regions, the ground resistance value should be less than 1000Ω.
I suggest that LZ take a look at the following two standards: HGT 20675-1990 – Code for Design of Static Grounding in Chemical Enterprises. http://bbs.hcbbs.com/viewthread.php?tid=340682&highlight=%BE%B2%B5%E7%BD%D3%B5%D8 http://bbs.hcbbs.com/viewthread.php?tid=347004&highlight=%BE%B2%B5%E7%BD%D3%B5%D8 I believe LZ will understand then: lol
Electrostatic grounding is required! Safety first, and it’s not very troublesome either!