Do cable conduits need to be grounded?

Lightning protection requirements for chemical equipment (1) When the thickness of the tank roof steel plate is greater than 4mm and a breathing valve is installed, a lightning protection device does not need to be installed. However, the oil tank body should be well grounded, with no less than 2 grounding points and a spacing of no more than 30m. The impact grounding resistance of the grounding device should not be greater than 30Ω. (2) When the thickness of the steel plate on the top of the tank is less than 4mm, even if a breathing valve is installed, a lightning rod should be installed on the top of the tank. The horizontal distance between the lightning rod and the breathing valve should not be less than 3m, and the protection range should not be less than 2m above the breathing valve. (3) Floating roof oil tanks (including inner floating roof oil tanks) do not need to be equipped with lightning protection devices, but there should be reliable electrical connections between the floating roof and the tank body. (4) Storage tanks for non-metallic flammable liquids should use independent lightning rods to prevent direct lightning strikes. At the same time, there should also be measures to induce lightning. The lightning rod impact ground resistance is not greater than 30Ω. (5) For underground oil tanks with soil covering thickness greater than 0.5m, lightning protection measures do not need to be considered, but the breathing valve, oil measuring hole, and gas extraction hole should be well grounded. There should be no less than 2 grounding points, and the impact grounding resistance should not be greater than 10Ω. (6) Open storage tanks of flammable liquids should be equipped with independent lightning rods, and their impact grounding resistance should not be greater than 5Ω. (7) Lightning protection for outdoor overhead pipelines: ①For outdoor pipelines transporting flammable gases, flammable or combustible gases, the grounding resistance at each location should not be greater than 30Ω at the beginning, end, branches, corners and straight parts of the pipeline every 100m. ②When the distance between the pipeline and the explosion-risk factory building is less than 10m, the two ends and every 30m-40m of the section close to the factory building should be grounded, and the grounding resistance should not be greater than 20Ω. ③When pipe connection points (elbows, valves, flanges, etc.) cannot maintain good electrical contact, metal wires should be used to bridge them. ④Metal brackets can be used for grounding down conductors. If it is a movable metal support, a jumper must be added between the pipe and the support ； If it is a non-metallic bracket, additional down conductors must be made. ⑤A grounding device is a device that uses electrical equipment to protect the ground. Grounding of fixed equipment for tanks, towers, and containers (1) Outdoor tanks, towers, and containers are generally equipped with lightning protection grounding, and there is no need to install separate static grounding. However, inspections should be carried out in accordance with the requirements for electrostatic grounding. For tanks, towers, and containers larger than 50M3 or with a diameter of more than 2.5m, there should be no less than 2 grounded parts. The grounding points should be arranged symmetrically with a spacing of less than 30m. (2) In principle, equipment such as tanks and towers requires repeated grounding on each component, and the grounding wire should be located away from the inlet and outlet of the material. (3) All metal parts inside and outside tanks, towers, containers and tool parts entering the tank should ensure reliable anti-static grounding. Grounding of pipe network systems (1) Pipeline systems transporting flammable and combustible liquids, gases, powders and their mixtures should have reliable grounding connections at the beginning and end of the pipeline through pumps, oil tanks and other equipment. (2) Filters, buffers, etc. in the pipe network should be equipped with grounding connection points. (3) The grounding of pipeline systems generally adopts the welding method, and the grounding wire and the grounding terminal are firmly connected through terminal crimping. If some pipes or components in the pipe network system are non-conductors, in addition to bridging and grounding the conductor pipes, the non-conductor pipe sections should also be provided with conductive shielding layers on their surfaces. The specific method is to use bare copper soft wire to make a spiral winding or install a metal mesh on its surface. You can also use the method of spraying a conductive covering layer to enhance the leakage of charge. (4) When equipment and pipelines are connected by metal flanges, it must be ensured that more than two bolts are reliably connected and the contact resistance between them is not greater than 10Ω. Under normal circumstances, it is not necessary to install additional jumper wires. Grounding of loading and unloading platforms and dock areas (1) Loading and unloading platforms, crane pipes, pipelines, rails and the beginning and end of the railway should be connected to form electrical paths and grounded. Before starting to fill the oil, the special ground wire clamp must be connected to the designated position of the vehicle. (2) In addition to being grounded, the rails in the loading and unloading platform and the oil depot must also be protected from zero. That is, all ground wires in the stack area should be connected to the zero line of the electrical equipment to prevent the potential difference between the track and the zero line from causing harm. (3) When a metal-structured oil tanker floats on the water, it does not need to be grounded separately. However, the equipment, components, pipelines, etc. on the ship must be electrically connected to the hull. When pipelines on land and pipelines on ships are connected with insulated hoses, there should be no jumpers on both sides, and their original grounding systems should be used respectively. Grounding of automobile oil loading platforms and oil and liquefied gas tank trucks (1) Moving parts such as automobile oil loading platforms and crane tubes should be grounded. Before oil loading begins, a special grounding wire must be installed at the designated position of the tank truck. The grounding wire should be installed before opening the tanker cover. The removal of the grounding wire should be done after the oil filling operation is completed, the tank cover has been closed, and then allowed to stand for a specified period of time. (2) When the oil loading crane pipe is a non-metallic hose, conductive oil-resistant rubber pipe should be used. If an ordinary oil-resistant rubber pipe is used, a soft copper wire with a diameter of not less than 2 mm should be wrapped around the outer skin of the pipe to connect it to the pipe head and the pipe, and be grounded through the pipe. (3) When filling a liquefied gas tanker with gas, the ground wire should also be installed and removed in accordance with regulations, and the movable hose should have conductive properties. (4) Cars loaded with oil (liquefied gas) should try to use tires of conductive materials to facilitate grounding. At the same time, a conductive drag strip with a resistance value between 140Ω and 200Ω must be installed on the vehicle body. (5) When various types of grounding devices are connected to the car body, the connection location should be on the side or rear of the station, away from the material loading inlet and discharge port.

It needs to be grounded to prevent leakage, and there is a lot about lightning protection.

It is better to be grounded to prevent lightning strikes

Cable conduit (metal) needs to be grounded to prevent leakage and eliminate induced electromotive force generated by current in the cable.

Grounding is required to prevent lightning strikes and induced currents. Generally, the wiring pipes in the process area and the equipment grounding are all connected to the same grounding grid.

I also learned some knowledge. People involved in chemical safety seem to be a bit weak in electrical aspects. ． ． ． ． ．

Need to be grounded! ! ! ! ! ! ! !

From the aspects of preventing electric shock, fire and explosion, grounding is required! ! !

You must be grounded, this is what the master taught you, and this is what the regulations require.