1. Before starting the furnace, inspect the electrical equipment, water cooling system, and inductor copper coils to ensure they are in good condition; operation is prohibited otherwise.
2. Promptly repair the furnace lining if erosion exceeds specified limits. Melting operations are strictly prohibited in crucibles with excessive lining erosion.
3. Power supply and furnace startup must be managed by designated personnel; touching the inductor or cables after power is applied is strictly prohibited. Personnel on duty must not leave their posts without authorization and must monitor the condition of the inductor and the exterior of the crucible. Additionally, ensure that the monitoring and alarm systems for the medium-frequency furnace's cooling water outlet temperature and the flow rate difference between inlet and outlet are functioning correctly.
4. When charging, inspect the furnace charge for flammable, explosive, or hazardous materials and remove them immediately. Do not add cold or wet materials directly into the molten steel. Once the melt reaches the upper section of the furnace, do not add large pieces of material to prevent the formation of a solid crust (bridging).
5. Prevent contamination by iron filings or iron oxide during furnace lining repair or crucible ramming; ensure the crucible is rammed to a high density.
6. Keep the pouring area and the pit in front of the furnace free of obstacles and standing water to prevent explosions caused by molten steel contacting water.
7. Do not overfill ladles with molten steel. When using a manual ladle, two operators must coordinate closely and move steadily-avoiding sudden starts or stops. Pour residual steel into the designated area; indiscriminate dumping is strictly prohibited.
8. Keep the medium-frequency generator room clean; do not bring flammable, explosive, or miscellaneous materials inside, and strictly prohibit smoking.
According to the "Criteria for Determining Major Accident Hazards in Industrial and Trade Enterprises," the presence of non-production-related standing water on the floor of the pit beneath the medium-frequency furnace constitutes a major accident hazard. Furthermore, the furnace's cooling water system must be equipped with monitoring and alarm devices for outlet temperature and inlet/outlet flow rate differences, and these devices must be kept in proper working order. Personnel performing special operations must undergo specialized training and obtain the required operating certification before commencing work. Altitude not exceeding 3,000 m; ambient temperature between 3°C and 40°C (anti-freezing measures required for areas below 0°C); monthly average maximum relative humidity not exceeding 90%; absence of conductive dust, explosive gases, or corrosive gases capable of severely damaging metal or insulation.