1. Appearance Integrity: Inspect the equipment casing for cracks, deformation, or corrosion, ensuring structural integrity. Explosion-proof mating surfaces should be undamaged, and all fastening bolts should be present and secure.
2. Sealing and Protection: Confirm that the clamping nuts of cable entry devices (such as explosion-proof glands) are not loose and that the sealing rings are not aged. The observation window should be clear, undamaged, and well-sealed.
3. Operating Status: Monitor the equipment for abnormal noises, vibrations, or temperature increases during operation. For liquid-immersed equipment, check that the protective fluid level is within the marked range.
4. Markings and Nameplates: Explosion-proof markings and nameplate information should be clear and complete, ensuring that equipment parameters match the operating environment.
1. Electrical Connection Reliability: Check for loose terminals, damaged cable sheaths, and whether electrical clearances and creepage distances meet requirements. Grounding Resistance of Intrinsically Safe Circuits: The grounding resistance of intrinsically safe circuits must be <=1Ω, and the cross-sectional area of the grounding wire must be no less than 4mm².
2. Internal Component Status: If necessary, open the cover to inspect internal components (such as circuit breakers and contactors) for damage or aging, and check for deterioration in insulation material performance.
3. Functional Testing: Test critical functions such as safety interlock devices and pressure relief devices to ensure their effectiveness. For example, liquid-immersed equipment requires regular replacement of the protective fluid and testing of pressure relief performance.
4. Environmental Adaptability: Assess the adequacy of protective measures and the proper functioning of ventilation and heat dissipation in harsh environments such as humid and dusty conditions.
1. Cycle: Regular inspections should generally not exceed once every 3 years, and once every 12 months for mobile equipment. However, depending on actual risks, this can be shortened to annually or more frequently.
2. Personnel Qualifications: Inspections and maintenance must be performed by professionally trained personnel with explosion-proof knowledge and experience, and training records must be maintained.
