How to construct and install explosion-proof monitoring
2024-4-11 View：
Explosion-proof equipment is defined as "electrical equipment that will not cause the surrounding explosive environment to ignite under specified conditions." Therefore, explosion-proof cameras should refer to "cameras that will not cause explosions." It can coexist peacefully with more than 100 kinds of "hot-tempered" flammable gases.
Some special industries, such as petroleum, chemicals, natural gas and other industrial enterprises, may leak and spill a variety of flammable and explosive gases, liquids and various types of gases and liquids during experiments, production, processing, transportation and storage. Dust and fibers are prone to explosions and fires, causing heavy losses to the country and people.
It is necessary to install explosion-proof cameras in these special industries. Explosion-proof cameras are a cross-product of the explosion-proof industry and the surveillance industry. Its installation is very particular. How to install it to maximize its effect?
1. Precautions for installation of explosion-proof cameras
The application of anti-riot cameras is mainly concentrated in finance, public security, prisons, commerce, subways, mining and relatively harsh environments. It can not only deal with man-made malicious acts of vandalism, but also deal with harsh natural and production environments to reduce them. It will cause damage to the camera, so what should you pay attention to when installing it?
The cable inlet of the explosion-proof camera must be sealed with a rubber sealing ring. It is prohibited to use other methods such as filling sealing putty or asbestos rope instead; it is prohibited to fill the cavity with any substance. Loss of explosion-proof performance; it is prohibited to discard the sealing ring and matching compression nut at the cable inlet for the sake of convenient connection; it is prohibited to merge multiple single wires into the cable inlet through a single-hole elastic sealing ring. The oil stains on the rubber sealing ring should be scrubbed clean to avoid aging and deterioration.
It is strictly prohibited to arbitrarily modify the structure, parts and internal circuits of the explosion-proof camera. The fastening bolts must not be arbitrarily replaced or missing. The elastic sealing gasket and metal gasket of the excess inlet and outlet must remain sealed at the factory, and the compression nut should be tightened to seal the inlet.
It is prohibited to conduct maintenance of electrical equipment and circuits while powered on in explosion-risk areas, and it is prohibited to schedule power transmission or power outage. A warning sign saying "No closing is allowed when someone is working" should be hung at the power outage. During maintenance, if the explosion-proof camera is dismantled to a safe area, the power cable ends of the equipment on site should be explosion-proof and it is strictly prohibited to energize it.
During daily operation and maintenance inspections, try to avoid opening the explosion-proof camera casing. When it must be opened, the power supply should be cut off first. If the flameproof shell is opened, the flameproof surface should be properly protected and not damaged. During maintenance, the flameproof surface should be placed upward and not directly in contact with the ground. After cleaning, the flameproof surface should be coated with phosphating paste or 204 anti-rust oil.
All explosion-proof cameras should establish equipment files, from equipment installation, commissioning, operation, maintenance, to explosion-proof downgrading and scrapping of the equipment. Various technical data from different periods should be collected, archived, and numbered one by one on the equipment.
The explosion-proof infrared camera relies on the infrared lamp equipped with the CCD to emit infrared light and reflect it on the object to the CCD camera lens to form an image. Therefore, when installing explosion-proof infrared cameras, we should avoid completely black objects, open spaces, water and other objects that absorb infrared light in the field of view. If the infrared rays are absorbed or weakened, the effective irradiation effect of the infrared light will be greatly reduced. This affects the monitoring picture effect of the explosion-proof infrared camera.
2. Example: Selection and precautions for explosion-proof cameras in gas stations
For key safety precaution areas such as oil depots, gates, and oil storage tanks in gas stations, the front-end camera-assisted lighting device, in addition to the general requirements for explosion-proof shield cameras, also has explosion-proof levels for explosion-proof shields and explosion-proof camera pan/tilts. Corresponding requirements also require a combustible gas detection system. When the detection reaches a certain concentration, the camera will monitor it accordingly and trigger an audible and visual alarm.
Gas stations have strict requirements for the installation of front-end equipment (explosion-proof cameras), and they also require the products to remain stable and reliable during use, without the need for frequent maintenance. Since gas stations are flammable and explosive environments, when installing surrounding environment monitoring equipment, special attention must be paid not to use flammable tools and flammable installation methods, and to avoid live installation. Explosion-proof electrical equipment must be used in gas station explosion hazard areas that are higher than or equal to the oil vapor level or group of the corresponding area. The connection and laying of wires must meet explosion-proof requirements. Connecting wires are usually protected with explosion-proof hoses or galvanized pipes.
From the experience of monitoring projects, we found that in order to have a safe and stable monitoring system, we must have a stable power supply. Due to unstable mains voltage, power outages often occur in suburbs. As a 24-hour gas station, this is not allowed. There are monitoring blind spots. Therefore, an online UPS power supply should be designed at each gas station to meet the monitoring needs. In terms of camera selection, explosion-proof shielded cameras are generally used, and nighttime assistance is considered according to monitoring needs.
In addition, gas stations with security systems installed have more or less potential safety hazards in terms of lightning protection measures. Therefore, gas stations should be equipped with air-termination devices, down conductors and grounding devices. Lightning rods should be installed at gas stations with open spaces and prominent buildings. The oil tank shall have at least two grounding points, and the tank body, pipes and other metal accessories shall be electrically connected and grounded. When a thunderstorm occurs, oil unloading operations should be stopped, and tank trucks parked in gas stations should be grounded for protection.
Some special industries, such as petroleum, chemicals, natural gas and other industrial enterprises, may leak and spill a variety of flammable and explosive gases, liquids and various types of gases and liquids during experiments, production, processing, transportation and storage. Dust and fibers are prone to explosions and fires, causing heavy losses to the country and people.
It is necessary to install explosion-proof cameras in these special industries. Explosion-proof cameras are a cross-product of the explosion-proof industry and the surveillance industry. Its installation is very particular. How to install it to maximize its effect?
1. Precautions for installation of explosion-proof cameras
The application of anti-riot cameras is mainly concentrated in finance, public security, prisons, commerce, subways, mining and relatively harsh environments. It can not only deal with man-made malicious acts of vandalism, but also deal with harsh natural and production environments to reduce them. It will cause damage to the camera, so what should you pay attention to when installing it?
The cable inlet of the explosion-proof camera must be sealed with a rubber sealing ring. It is prohibited to use other methods such as filling sealing putty or asbestos rope instead; it is prohibited to fill the cavity with any substance. Loss of explosion-proof performance; it is prohibited to discard the sealing ring and matching compression nut at the cable inlet for the sake of convenient connection; it is prohibited to merge multiple single wires into the cable inlet through a single-hole elastic sealing ring. The oil stains on the rubber sealing ring should be scrubbed clean to avoid aging and deterioration.
It is strictly prohibited to arbitrarily modify the structure, parts and internal circuits of the explosion-proof camera. The fastening bolts must not be arbitrarily replaced or missing. The elastic sealing gasket and metal gasket of the excess inlet and outlet must remain sealed at the factory, and the compression nut should be tightened to seal the inlet.
It is prohibited to conduct maintenance of electrical equipment and circuits while powered on in explosion-risk areas, and it is prohibited to schedule power transmission or power outage. A warning sign saying "No closing is allowed when someone is working" should be hung at the power outage. During maintenance, if the explosion-proof camera is dismantled to a safe area, the power cable ends of the equipment on site should be explosion-proof and it is strictly prohibited to energize it.
During daily operation and maintenance inspections, try to avoid opening the explosion-proof camera casing. When it must be opened, the power supply should be cut off first. If the flameproof shell is opened, the flameproof surface should be properly protected and not damaged. During maintenance, the flameproof surface should be placed upward and not directly in contact with the ground. After cleaning, the flameproof surface should be coated with phosphating paste or 204 anti-rust oil.
All explosion-proof cameras should establish equipment files, from equipment installation, commissioning, operation, maintenance, to explosion-proof downgrading and scrapping of the equipment. Various technical data from different periods should be collected, archived, and numbered one by one on the equipment.
The explosion-proof infrared camera relies on the infrared lamp equipped with the CCD to emit infrared light and reflect it on the object to the CCD camera lens to form an image. Therefore, when installing explosion-proof infrared cameras, we should avoid completely black objects, open spaces, water and other objects that absorb infrared light in the field of view. If the infrared rays are absorbed or weakened, the effective irradiation effect of the infrared light will be greatly reduced. This affects the monitoring picture effect of the explosion-proof infrared camera.
2. Example: Selection and precautions for explosion-proof cameras in gas stations
For key safety precaution areas such as oil depots, gates, and oil storage tanks in gas stations, the front-end camera-assisted lighting device, in addition to the general requirements for explosion-proof shield cameras, also has explosion-proof levels for explosion-proof shields and explosion-proof camera pan/tilts. Corresponding requirements also require a combustible gas detection system. When the detection reaches a certain concentration, the camera will monitor it accordingly and trigger an audible and visual alarm.
Gas stations have strict requirements for the installation of front-end equipment (explosion-proof cameras), and they also require the products to remain stable and reliable during use, without the need for frequent maintenance. Since gas stations are flammable and explosive environments, when installing surrounding environment monitoring equipment, special attention must be paid not to use flammable tools and flammable installation methods, and to avoid live installation. Explosion-proof electrical equipment must be used in gas station explosion hazard areas that are higher than or equal to the oil vapor level or group of the corresponding area. The connection and laying of wires must meet explosion-proof requirements. Connecting wires are usually protected with explosion-proof hoses or galvanized pipes.
From the experience of monitoring projects, we found that in order to have a safe and stable monitoring system, we must have a stable power supply. Due to unstable mains voltage, power outages often occur in suburbs. As a 24-hour gas station, this is not allowed. There are monitoring blind spots. Therefore, an online UPS power supply should be designed at each gas station to meet the monitoring needs. In terms of camera selection, explosion-proof shielded cameras are generally used, and nighttime assistance is considered according to monitoring needs.
In addition, gas stations with security systems installed have more or less potential safety hazards in terms of lightning protection measures. Therefore, gas stations should be equipped with air-termination devices, down conductors and grounding devices. Lightning rods should be installed at gas stations with open spaces and prominent buildings. The oil tank shall have at least two grounding points, and the tank body, pipes and other metal accessories shall be electrically connected and grounded. When a thunderstorm occurs, oil unloading operations should be stopped, and tank trucks parked in gas stations should be grounded for protection.