Gas station lightning protection and grounding problems, what are the contents of comprehensive ligh

The lightning protection and grounding requirements of gas stations are relatively high, and the lightning protection and grounding construction requirements are relatively strict, so in the lightning protection and grounding of gas stations, we must choose high-quality grounding brand consumables when choosing exothermic welding powder and electrolytic ion grounding electrode, because gas stations in such places, gasoline is volatile, and a little static electricity may cause serious consequences, so it is forbidden to play in such places, and gas stations must do a comprehensive lightning protection grounding, and lightning protection grounding in this kind of place has strict construction specifications. Specific lightning protection and grounding need to do the following points:

1. The oil tank shall be grounded for lightning protection, and the grounding point shall not be less than two.

3. When the lightning protection, anti-static grounding, working grounding of electrical equipment, protective grounding and information system grounding of gas stations are separately provided with grounding devices, the grounding resistance of the lightning protection grounding device of the oil tank, the grounding resistance of the grounding device at both ends of the metal sheath of the wiring cable and the grounding device at both ends of the protective steel pipe is not greater than 10; The protective grounding resistance is not more than 4; The grounding resistance of the grounding device at the beginning, end and branch of the above-ground oil pipeline is not more than 30.

4. The buried oil tank and the process pipeline exposed to the ground are electrically connected to each other and grounded.

8. Both ends of the cable metal sheath or cable metal protection pipe of the power supply system are grounded, and the power supply end of the power supply and distribution system is installed and the equipment is resistant.

Overvoltage (surge) protector for voltage level.

9. The beginning, end and branch of the oil pipeline laid on the ground or in the trench are equipped with a joint grounding device that prevents static electricity and induction lightning, and its grounding resistance is not more than 30.

11. Metal wires are used to connect the flanges and hoses at both ends of the oil pipelines in the most dangerous area. When there are no less than 5 connecting bolts of the flange, in a non-corrosive environment, it can not be jumped.

12. The grounding resistance of the anti-static grounding device is not greater than 100.

13. The lightning protection and anti-static device has been tested and qualified, and is within the validity period of the test.

In fact, the most important thing to pay attention to is the erection and grounding of independent lightning rods, according to some of the lightning protection and grounding problems we have solved, it is often the side strike of the independent lightning rod and the counterattack of the ground potential that causes the damage to the tanker. It can be said that there is no gas station due to a poor anti-direct lightning, which can be seen that the grounding of the general tank is still easy to meet the requirements, mainly because the fuel dispenser is damaged.

Therefore, when erecting an independent lightning rod (lightning belt), one is to pay attention to the protection radius, the other is to pay attention to the use of materials (it is best to use a round twisted wire as a lightning belt and down wire to prevent tip discharge), and the third is to pay attention to the distance between the independent ground grid and the fuel dispenser and the tank grounding should be far enough (to prevent the ground potential counterattack).

The tank can be simpler, it doesn't matter if you do the ground net, it is also a way to weld flat iron with a few grounding piles, but the lightning rod and lightning belt must be done with the ground net, the resistance value of the direct lightning resistance required in the specification is not more than ten ohms, this resistance is still very easy to achieve, but considering the anti-corrosion and service life of the grounding material, it is not better to do it below four euros in your own private gas station, four euros is also very easy to achieve, and the input is about the same.

Improve the lightning protection and grounding of gas stations, mainly from the reasonable design, construction aspects to consider, you want to save costs is not a way, is to save not much, then again, as long as the design and construction is reasonable, the lightning protection grounding of gas stations does not cost much.

The grounding of the buried tank can be done according to your ideas, the lightning protection belt and independent lightning rod on the roof should pay attention to the down line to be led down the pipe, and the ground network is actually a discharge pit on the line, the general soil 2 * 2 * 2 drainage pit to do one or two euro resistance should be said to be very easy, the other is to pay attention to the introduction of the power line or should do power lightning protection, ** line network line or something to do signal lightning protection, so that the gas station should not have any problems.

1. If you need to make a grounding grid, you can drive two grounding piles into them and weld them with flat iron, use round steel as the grounding body, and bury them at a depth of meters. Each tank needs to be grounded in two places.

2. Because there is gasoline in the tank and cannot be welded, the flat iron linked to the grounding electrode can be screwed on the manhole cover but not less than two bolts.

3. Because this grounding body also has the function of anti-static grounding, its grounding resistance value should not be greater than 10 ohms.

Fourth, the oil tank burial should also consider the problem of anti-corrosion, should use a strengthened anti-corrosion, that is, asphalt-fiberglass-asphalt-asphalt-fiberglass.

The oil tank of the gas station must touch the stool for lightning protection and grounding, and the grounding point should not be less than one. （）

a.That's right. b.Mistake.

Correct Answer: Tremor B

The lightning protection grounding, anti-static grounding, working grounding of electrical equipment, protective grounding, grounding of electronic systems, grounding of lightning protectors, etc., should share the grounding device, and its grounding resistance value should not be greater than 4 ohms. The ground network is not known to be designed as a ring-closed lightning protection grounding device according to the terrain. The horizontal grounding body uses 40 4mm galvanized flat steel, buried to a depth of meters; The vertical body uses L50 50 5 galvanized angle steel, which is long and buried deep; Non-metallic grounding modules are used between vertical ground bodies.

The ground net test pole is drawn out of the ground for later detection. The tower is connected to the ground grid through four legs, and the steel bars in the foundation of the machine room and the substation room are connected to the ground grid at the four corners.

After the gas station building is used as a ring grounding device, all the metal pipes, cable metal sheaths and wire protection pipes entering and exiting the ring grounding device are connected at the intersection of the ring grounding device. All the equipment and components that need to be grounded in the gas station, such as oil tanks, fuel dispensers, ventilation pipes, switchboards, electronic system switchboards, switches, lamps, etc., should be connected with the grounding network, so that the adjacent metal conductors and equipment shells have equal potential, prevent lightning from counterattacking sparks and avoid electric shock to maintenance operators, and protect equipment and personal safety. There are two aspects to the gas station equipotential connection:

The first is to directly connect the fuel dispenser shell, refueling gun, oil tank, breathing valve, cable metal shielding, metal doors and windows of the gas station with conductors, so that the whole gas station becomes a good equipotential body;

The second is to connect a suitable overvoltage protection device at the power line or the wire that is connected to the outside world, and the grounding end of the protection installation is directly electrically connected to the lightning protection ground of the gas station. When detecting, a multimeter can be used to measure whether the hidden part is an equipotential body.

Gas station tank farm does not need to install lightning rods, now gas station canopies, station roofs are generally made of steel structure and greater than or equal to 4mm, according to the specifications do not need to install lightning rods Only need to lay a circle of galvanized round steel with a diameter greater than or equal to 10mm. The gas station is a level 2 lightning protection and that's pretty much it.

Externally mounted lightning rods! Do a good job of grounding! All kinds of metals inside are electrostatically grounded! The internal power supply is equipped with a power surge protector! --Zhengzhou Putian lightning protection technology --- user name.

1. Recognize the properties of lightning and take correct measures Lightning is a discharge phenomenon in nature. When lightning is generated, the voltage can reach more than 300,000 volts and the current can reach more than 200,000 amperes. Lightning strikes directly on buildings, has a considerable impact, and generates heat.

Its power can knock down giant trees and shatter boulders. The heat generated by the lightning itself is enough to make a fire.

1. I don't know how rotten the rotten steel pipe you are talking about? If it is severely rusted and corroded, it is useless;

2. The length, diameter and wall thickness of the steel pipe will affect the effect of lightning dispersion, the length should be at least meters, the diameter should be 4cm, and the wall thickness should be more than 2mm;

3. The steel pipe should be buried vertically into the ground at a depth of 1 meter + (the upper end of the steel pipe is 1 meter + from the ground).

4. The problem of welding joints, the length of the weld between the steel bar and the flat iron, the flat iron and the steel pipe, and the steel bar and the nitrogen tank should be more than 10cm and should be seamlessly welded on both sides;

5. Use a steel bar with a diameter of 2 cm to reliably weld the exhaust pipe and the grounding wire;

6. All the wires exposed to the air should be painted with anti-rust paint, including welded and unwelded parts.

It's okay to pour it in concrete! As long as the grounding resistance value meets the requirements!