Enterprise safety inspection checklist for frozen weather conditions

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I. Safety Management Manual before the Arrival of Cold Weather I. General Requirements 1. Appoint a \"weather duty officer\" to monitor weather conditions (using meteorological service information from the **meteorological agency or equivalent institutions), implement relevant procedures, and organize a well-trained emergency response team. 2. Train the emergency team on how to properly remove snow from rooftops, roads, and equipment. 3. Mobilize emergency supplies, including: ● Large amounts of tarpaulin for wind protection ● Steam hoses for thawing frozen pipelines ● Portable heaters to provide warmth for maintenance workers or to prevent the control room from freezing ● Anti-freezing materials for cooling systems ● Shovels, carts, and snow blowers ● Cold-protective clothing and hand protection gear for maintenance and operation personnel. 4. Prepare snow removal equipment. 5. Ensure that portable heaters are equipped with safety interlocks, have sufficient fuel, and can operate normally. 6. Specify the priority order for steam usage to ensure the operation of critical equipment, and install an appropriate steam tracing system. 7. Place the thermometer in an area where fragile equipment is stored and where heating is not possible. 8. Do not stop operation during prolonged low-temperature conditions. 9. If the factory is unattended, a supervision and alarm system should be installed to monitor power supply, building temperature, the low-water-level fuel shutdown protection on the boilers, water temperature in outdoor reservoirs, and process control devices. 10. In idle areas or areas where freezing has occurred in the past, the water stored in water delivery systems, as well as in any equipment where condensation or freezing might occur, should be drained off, including instrument air pipelines and the dry pipes of automatic sprinkler systems. For equipment where drainage is not feasible, antifreeze should be added. II. Building safety inspection checklist 1. Ensure that the building’s enclosure is intact, and seal any unnecessary openings, especially doors and windows. 2. The insulation layer should be replaced after the repair is completed. 3. Design heating and insulation systems for buildings and equipment to maintain a temperature of no less than 4 degrees Celsius (40 degrees Fahrenheit). 4. Inspect the heating system to ensure that it can maintain a temperature of at least 4 degrees Celsius (40 degrees Fahrenheit) in the coldest areas of the building (such as the corners on the windward side of the building, eaves, or areas without direct heat sources). If the supply contract for a certain fuel might be interrupted, adequate and secure additional emergency heating equipment should be maintained from two fuel sources in areas prone to freezing, and it should be set to activate automatically when the temperature drops below 4 degrees Celsius (40 degrees Fahrenheit). 5. Identify hidden areas, such as those where fragile pipes are installed above ceilings or beneath floors. Consider providing temporary internal openings to allow heat to enter these areas. III. Boiler Safety Checklist
1. Completely drain any water from idle equipment. 2. Raise the low point or install a drain valve on the condensate return pipeline. 3. Where possible, eliminate low points and closed ends. 4. Equip the pipeline with steam traps or drain valves. 5. Install a low-water-level fuel cut-off device, and avoid using exposed pipelines as much as possible. 6. For the pipelines that supply water to the water level gauge, the water level column of the low-water-level fuel cut-off device, and the feedwater regulator, it is advisable to install heat tracing pipelines. 7. Equip important pipeline systems with alarm devices. 8. For water-cooled equipment such as compressors and pumps, adequate heating should be provided, they should be placed in a heated enclosed area, or appropriate anti-freezing solutions should be used. 9. Equip the water filling instrumentation and control circuits with heating and insulation systems. 10. For certain equipment (such as pumps, fans, and compressors), especially those installed outdoors or in rooms without heating, lubricants suitable for low-temperature conditions should be used. 11. For idle air conditioning systems, the water in the oil cooler and water jacket should be drained, and the condenser of the chiller must be emptied. 12. Ensure an adequate supply of fuel, especially for those fuels whose supply contracts may be interrupted. If oil is used as a backup fuel, it is necessary to confirm that the tank is full and that the delivery system to the heating device is functioning properly. 13. Inspect the ventilation openings, pressure relief valves, and safety valves of pressure vessels to ensure that moving parts are properly protected from water accumulation or freezing of water vapor. 14. Construct and install windbreak walls to protect outdoor equipment, pipelines, and instruments. 15. Check whether the dryer in the instrument air system is operating properly. IV. Fire Protection Equipment Safety Inspection Checklist 1. Place a thermometer in a strategic location inside the building—such as near the sprinkler system—to monitor the temperature inside the building. 2. Understand the location of the main groundwater pipelines. Ensure sufficient coverage depth, especially in areas where construction, excavation, or erosion occurs. 3. Dry pipe systems: ● By taking insulation measures and installing a safe space heater, the temperature in the dry pipe valve chamber is kept above 4 degrees Celsius (40 degrees Fahrenheit). ● Check whether the inclination of the pipeline allows condensate to flow to the lowest drainage point; install additional drainage points if necessary. ● Regularly drain the water accumulated at the lowest points, and install additional drainage outlets if necessary. ● Ensure that the system is thoroughly drained of residual water after each annual tripping test. ● Obtain the air supply for the compressor from the area protected by the spray system ； If the humidity is high, an air dryer should be installed or compressed nitrogen should be used. ● Repair air leakage issues in the pipeline system to prevent the dry valve from tripping due to compressor power loss. If the sprinkler system is damaged, please notify the local fire department. The water in the automatic sprinkler system should only be drained as a last resort. 4. Fire pump: ● Maintain the pump room temperature above 4 degrees Celsius (40 degrees Fahrenheit). ● For diesel engine transmissions, the room temperature must not be lower than 21 degrees Celsius (70 degrees Fahrenheit). ● If the pump draws water from an open-air reservoir, it must be ensured that the suction inlet and pipelines are below the freezing level of the ground, and at a sufficient depth underwater to avoid being blocked by ice. 5. Gravity water tanks and reservoirs: ● To flush the heater and pipelines. ● Ensure that the circulation pump of the heater is operating properly. ● Repair vapor traps and filters. 6. Check the seal of the fire hydrant and repair any leaks ； The buried valves also need to be inspected, and any existing leakage issues must be repaired. II. Safety Inspection Manual for Prolonged Low-Temperature Weather I. General Requirements 1. The “Weather Monitor” shall check weather information on a daily basis (using meteorological service data from the **Meteorological Agency or equivalent institutions) and inform the emergency response team of the conditions resulting from low temperatures. 2. Monitor and record the temperature in areas where fragile equipment is stored and where heating is not possible ； During periods of extreme low temperatures, measurements should be taken every few hours. 3. For critical areas, it is necessary to check not only the daytime temperatures but also the nighttime and weekend temperatures. Use alarm devices connected to security services or continuous patrol services. II. Roof safety inspection checklist 1. Roof collapses do not occur out of nowhere. The amount of snow on the roof should be monitored, and it should be removed before it reaches a dangerous level. 2. The roof should have sufficient drainage outlets, which must remain unobstructed and not clogged by ice. III. Conduct a equipment safety checklist to inspect the heating systems and ensure they are operating properly. ■ For water-cooled equipment without other protective measures, the remaining water should be drained. ■ Regularly vent the condensate vapor from the compressed air pipeline. ■ If the plant’s heat source is to be completely lost: ● Drain the water stored in the following equipment: — Process pipelines — Industrial pipelines — Heat exchangers — Process equipment — Compressors — Water jackets — Condensate pipelines — Boilers — Hydraulic systems — Air conditioning systems ● Establish emergency procedures for processes that rely on steam or water. ● Drain pipeline systems containing non-aqueous liquids that are prone to freezing (such as the solidification of heat-treated materials). ——Check whether there is frosting or icing on the ventilation openings, pressure relief valves, and safety valves of the pressure vessel. ——Special care must be taken when thawing frozen pipelines and equipment ； Avoid open flames. IV. Fire protection equipment safety inspection checklist 1. Regularly inspect the wet and dry pipes of the sprinkler system to ensure there is no ice formation. 2. Protect all fire-fighting equipment (such as fire hydrants, hose reels, fire truck connection devices, and spray system control valves) from ice and snow, and ensure easy access to them. 3. Maintain the temperature in the dry-pipe valve rooms of the sprinkler system and in the fire pump rooms at above 4 degrees Celsius (40 degrees Fahrenheit), and in the fire pump rooms driven by diesel engines at above 21 degrees Celsius (70 degrees Fahrenheit). 4. For the gravity water tank and suction water tank, maintain the water temperature above 4 degrees Celsius (40 degrees Fahrenheit).