Summer Extreme Weather Hazardous Chemical Safety Risk Tips
Entering the summer, high temperature, high humidity, lightning, rainstorms, extreme weather increases, hazardous chemical accidents into the prone to frequent period. Tiefeng District Emergency Management Bureau for extreme weather hazardous chemical enterprises in the jurisdiction to make the relevant safety risk tips.
Risk Identification
01
Risk of reaction of hazardous chemicals in contact with water or moisture: during the flood season, there is a lot of rain and the air is humid, and some hazardous chemicals (e.g., sodium, potassium, lithium, magnesium powder, zinc powder, phosphorus trichloride, fluorine, sulfur trioxide, alkyl lithium, etc.) have the danger of explosion in contact with water; some hazardous chemicals (e.g., insurance powder, sodium hydrothiocyanate, butyl lithium, ethylborane, triethylaluminum, dimethylzinc, etc.) have the risk of combustion in contact with water; and some hazardous chemicals (e.g.: Phosphorus pentoxide, sodium phosphide, potassium phosphide, sodium cyanide, potassium cyanide, potassium trichloride, trichlorosilane, sulfoxide chloride, benzoyl chloride, etc.) react with water to produce toxic gases, resulting in poisoning risks.
02
Risk of spontaneous combustion of decomposition of hazardous chemicals: In hot weather, some hazardous chemicals (e.g. ammonium nitrate, nitrocellulose, sodium azide, white phosphorus, potassium hydride, lithium aluminum hydride, sodium methanol, acetaldehyde, peracetic acid, dibenzoyl peroxide, etc.) are easy to decompose when exposed to heat and emit a large amount of heat. If the ventilation is not good, the heat is gathered and not dispersed, resulting in the temperature rising, and the accumulation of heat reaches the auto-ignition point which will lead to spontaneous combustion, and some of the substances with a lower auto-ignition point may exceed the temperature during the daytime in summer. Some substances with low auto-ignition points may exceed their auto-ignition points during the daytime in summer, which may easily cause fire and explosion.
03
Thunderstorms can easily cause power shaking or blackout of the plant, leading to large-scale power failure and unplanned stoppage of the chemical plant. Under the humid and rainy environment, the insulation of electrical wiring and facilities is reduced, and leakage is easy to occur, and leakage is also easy to occur when emergency drainage equipment is used improperly. Lightning is also a source of ignition for combustible and flammable substances, which may cause fires and explosions in chemical production units, hazardous chemical storage tanks and fireworks storage areas.
04
Flood season rainy season road conditions are complex, low visibility on rainy days, rain leads to slippery road surface, reducing braking resistance, while the road is affected by heavy rainfall is prone to landslides, landslides, the transportation of hazardous chemicals on the road safety has a significant impact.
05
Heavy rain may cause poor drainage and flooding in a short time, and rain and sewage can not be diverted in time, resulting in the spillage of hazardous chemical sewage, which has an impact on the water environment.
06
High winds will have a greater impact on the outdoor construction site, triggering damage and collapse of scaffolding, improvised scaffolding, isolation barriers, tower cranes, etc., which may also lead to breakage and damage of corrosion-prone parts of the production devices and storage equipment, and cause secondary accidents.
Safety Preventive Measures
Strengthen the safety management of storage of hazardous chemicals.
Proper management of sodium cyanide and other highly toxic substances, strict implementation of the “five double” management requirements, packaging, storage sites and monitoring and alarm facilities are always in a normal state. Hazardous chemicals that need to be stored under temperature control should be stored in special warehouses, special tanks or cold cabinets to ensure the effective operation of the temperature control system; barrels of flammable liquids and compressed gas cylinders should be kept out of direct sunlight. Hazardous chemicals that are exposed to (wet) water for chemical reaction, easy to cause fire and explosion, and produce toxic substances, etc., shall not be placed in damp, permeable and roof leakage of the warehouse. Storage warehouses, tanks, drums, bottles, etc., should strictly implement moisture-proof and water-proof measures to prevent accidental loss or leakage of hazardous chemicals secondary to typhoons, thunderstorms and other inclement weather. The storage of hazardous chemicals, especially flammable and explosive, moisture and heat, poisonous products, etc. in the flood season before a reasonable reduction in the amount of storage, as far as possible to achieve “zero storage”.
Strengthen the inspection and maintenance of electric facilities.
Lightning protection and grounding of all equipment, electrical, instrumentation and other comprehensive and detailed mapping and verification to ensure that no loose, no serious corrosion, comprehensive testing of lightning protection and grounding impact grounding resistance value, so that none of the negligence, timely rectification of the problem, every place are qualified. Do temperature testing on transformers, cables, cable joints, motors, contact points of electrical components, etc., to prevent over-temperature; transformer and distribution rooms, switching stations, junction boxes, bearings, etc., to do a good job of rain and waterproofing, and to do a good job of inspection after the rain. Enterprises should continuously improve the emergency plan for large-scale power outages and conduct drills to ensure that power outages can be handled correctly when they occur and that the impact can be minimized. Production devices, storage facilities, safety valves, venting ports and other key parts of lightning protection, vulnerable to lightning strikes and fires, enterprises should strengthen process control to ensure that safety valves, rupture discs intact, shall not be over-temperature and over-pressurization caused by the release of materials. Focused control of high-altitude discharge points to prevent leakage of lightning strikes and fires.
Effectively implement flood prevention and waterlogging measures.
Comprehensively check the rainwater, sewage diversion and discharge system, flood drainage facilities, drainage ditches, canals, ports, etc., timely dredging to ensure smooth. Strengthen the inspection and maintenance of sewage treatment facilities to ensure that they are always in good operating condition, and strengthen the testing of discharged wastewater to achieve discharge standards. During thunderstorms and heavy rain, take effective measures to realize rain and sewage, clean sewage diversion, prevent sewage from being strung into the rainwater drainage system, deal with the low-lying water in the plant and device area in a timely manner, and ensure that the drainage facilities are in good condition, so as to avoid the occurrence of environmental pollution accidents.
Strengthen the safety management of hazardous operations and construction work.
Chemical (hazardous chemicals) enterprises in thunderstorms, typhoons and other inclement weather conditions should stop fire operations, work at height, temporary electricity, lifting and other special operations, stop the loading and unloading of hazardous chemicals. The construction site of the isolation barrier, scaffolding, temporary scaffolding, lifting cranes, etc. to carry out a comprehensive investigation of hidden dangers, the implementation of reinforcing measures. Strengthen the operation and maintenance of production devices and storage facilities, and timely replace severely corroded pipelines, flanges, equipment, facilities, etc., to prevent typhoons from damaging equipment and facilities and causing hazardous materials running, bubbling, dripping and leaking.
Strengthen the management of hazardous chemical transportation.
Choose reasonable and better driving routes, stay away from towns and residential areas, and do not enter the area where dangerous goods transportation vehicles are prohibited. Vehicles transporting highly toxic chemicals should follow the time and route approved by the public security authorities, and should not be changed arbitrarily. Transportation vehicles should have good rainproof measures to ensure a dry environment inside the car; maintain a reasonable distance between the vehicles in front of them, and reduce the speed and increase the distance between them in case of thunderstorms and other inclement weather.
Strengthen the duty and emergency management.
Hazardous chemical enterprises (units) to strengthen the typhoon, thunderstorms during the leadership on duty, strengthen the key parts of the inspection tour, timely study and judgment of the risk of production safety, and coordination to deal with a variety of abnormalities, prominent situation. Develop emergency plans for typhoons, thunderstorms and other special weather conditions, carry out targeted emergency drills at the right time, equip with applicable and effective emergency supplies and equipment, implement rescue and relief forces, and make decisive decisions on major dangers or disasters and accidents, respond quickly, respond appropriately, and dispose of them efficiently. At the same time, the system of reporting information on production safety accidents and major safety risks is strictly implemented.
