Factory explosion-proof instrument has hidden dangers? Doing so will make your work safer!
Author:vacorda Source:vacorda.com Date: 2018-09-04 14:35:09
In the electrical engineering, installation and construction, operation and maintenance and safety technical management of explosion hazardous areas, explosion-proof measures must be taken to achieve overall explosion protection.
The explosion-proof instrument does not have safety hazards, which can play a real protective role. Therefore, the safety inspection of explosion-proof electrical equipment is mainly aimed at the selection, installation and construction of explosion-proof electrical equipment in explosion-hazardous places, whether it is standardized and correct, whether there are defects in the facilities in use, and whether the management system is complete.
Factory explosion-proof instruments have hidden dangers, is it safe?
1. The explosion-proof and disturbing tube is not fixed and is not protected. If the instrument is removed, it should be blocked.
2. Why is the threading pipe not blocked?
3. Cables in hazardous locations should be protected by pipes!
4. The diameter of the cable is inconsistent with the size of the threading hole, and it is sealed with explosion-proof glue.
5. The wiring hole is blocked, the insulation cotton can not be used!
6. The explosion-proof seal ring is aging, it must be replaced in time!
7. The explosion-proof introduction device is loose, what are you waiting for?
8. There is no effective isolation between different regional interfaces; the conduits or through holes on the wall of different explosion hazardous areas are not effectively blocked.
Accurately install and maintain factory explosion-proof instruments to make work safer!
Explosion-proof instrument installation requirements
The instrument and installation materials installed in the explosion hazardous area shall have nameplate and explosion-proof mark. Before installation, check whether the model and specification meet the design requirements, and there should be no damage or crack on the outside.
For wiring of instruments in explosion hazardous areas, cables and wires must be laid with galvanized steel pipes. Between the thread-protecting tubes, the protective tube and the junction box and the cable box should be connected by a cylindrical pipe thread.
When protective tubes, sinks, and cable trenches pass through different levels of explosion hazardous area boundaries, sealing measures (such as explosion-proof flame arresters, seal assembly isolation, filling and sealing, etc.) should be taken to prevent explosive gases from being struck from a hazardous location. Into another dangerous place.
When the protection tube is connected with the field instrument, detection component, electrical equipment, instrument box, junction box and cable box, the explosion-proof sealing pipe fitting should be installed within 0.45m of the joint, and if necessary, fill and seal. A flexible pipe connection can be used between the sealed pipe fitting and the field instrument, the detecting component, and the electrical equipment.
2 explosion-proof instrument filling and sealing
The filling seal is also called a glue seal or a glue seal, that is, a seal that is poured into the glue.
The explosion-proof cable gland shall be filled and sealed in the following cases:
Since the diameter of the cable and the diameter of the sealing joint are not matched, it is looser and smaller than the diameter of the sealing joint; when 2 to 3 cables are simultaneously connected through a sealed joint.
Inspection and maintenance should be carried out frequently. The inspection should look at the appearance of the instrument, the environment (temperature, humidity, dust, corrosion), vibration, and whether the installation is firm.
When the explosion-proof instrument is to be maintained under power-on conditions, the junction box and the observation window must not be opened. The power must be cut off before opening the cover. Never open the cover for maintenance.
No sparks may be generated during maintenance. The test instrument used shall be an explosion-proof or intrinsically safe type of instrument to prevent the test instrument from causing induced sparks or directing excessive voltage to an inappropriate location.
When disassembling, care should be taken to protect the explosion-proof thread and the explosion-proof plane. It must not be damaged or scratched. In particular, longitudinal scratches are not allowed on the explosion-proof plane.
When disassembling the rubber sealing element, do not use a sharp instrument to harden it, harden it, and do not have any longitudinal scratches on its sealing surface.
When assembling, it should be carried out in the order of assembly, and the anti-loose parts and fasteners must not be leaked.
Corroded and damaged components should be replaced in time, and the rubber sealing components that are aging, damaged, and not sealed should be replaced in time.
After the instrument is regularly inspected, it must be confirmed that the explosion-proof performance has been restored before it can be put back into use!
Sichuan Vacorda Instruments Manufacturing Co., Ltd
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