What Are The Preventive Measures To Avoid Fire During The Use of Fume Hoods?

Regarding electrical safety

Standardize electrical circuits: The electrical circuits of electrical equipment used in fume hoods, such as lighting fixtures, sockets, motors, etc., must be laid in accordance with the standards. Avoid disorderly wiring and random connection to prevent the generation of electric sparks due to wear, aging or poor contact of the wiring. For instance, the lines should be protected by appropriate conduits to avoid direct exposure, reduce the chance of contact with corrosive gases or vapors, and lower the risk of damage to the insulation layer of the lines.

Regularly inspect the electrical system: Arrange for professional personnel to regularly inspect the electrical system of the fume hood, including the insulation performance of the circuits, the tightness of the sockets, and the operating status of the motors, etc. Detect and handle electrical faults in a timely manner, such as short circuits and leakage. For instance, an insulation resistance tester can be used to regularly test the insulation resistance of the circuit to ensure it meets safety standards.

Avoid overloading: Do not connect too many high-power electrical devices simultaneously in the fume hood to prevent overloading of the electrical circuits. Overloading can cause the circuit to heat up, increasing the possibility of a fire. For instance, if the rated power of the socket in the fume hood is limited, it is advisable to avoid using multiple high-power heating devices or stirrers simultaneously.

In terms of flammable material management

Control the storage quantity of flammable materials: Try to minimize the number of flammable reagents and items stored in fume hoods. If it must be stored, it should be placed in a dedicated fireproof container and kept away from heat sources and fire sources. For instance, flammable organic solvents should be stored in fireproof cabinets that meet safety standards, and the amount stored each time should not be excessive; it is sufficient to meet the experimental requirements.

Proper handling of flammable waste: Flammable waste generated during experiments, such as filter paper and cotton balls contaminated with flammable reagents, should be collected in a timely manner and properly disposed of. Do not casually discard these wastes in or around the fume hood to avoid causing a fire. For instance, flammable waste can be placed in dedicated metal containers for regular cleaning and disposal.

Prevent leakage of flammable substances: When using flammable reagents, strictly follow the operating procedures to avoid reagent leakage. In case of leakage, immediate measures should be taken for handling, such as using adsorption materials to absorb the leaked reagents to prevent them from spreading to other parts of the fume hood or the surrounding environment. For instance, when handling flammable organic solvents, leak-proof droppers or pipettes can be used, and oil-absorbing cotton or other adsorption materials can be placed in the fume hood for emergencies.

Regarding equipment maintenance

Keep the fume hood clean: Regularly clean the dust, debris and residual reagents inside the fume hood to prevent excessive accumulation of these substances and cause a fire. In particular, the ventilation ducts and filters of fume hoods should be cleaned and maintained regularly to ensure the normal operation of the ventilation system. For instance, a simple cleaning of the interior of the fume hood can be carried out once a week, and a comprehensive inspection and cleaning of the ventilation ducts and filters can be conducted once a month.

Check the ventilation equipment: The ventilation equipment of the fume hood is an important component to ensure the safety of the experiment. Its operating status should be checked regularly. Ensure that the fan rotates at a normal speed and has sufficient air volume to promptly expel the harmful gases and heat inside the fume hood to the outside. If any abnormality is found in the ventilation equipment, such as increased noise or reduced air volume, it should be repaired or replaced in a timely manner. For instance, the operation of the ventilation equipment can be checked every day before the experiment, and parameters such as the rotational speed and air volume of the fan can be recorded.

Maintain heating equipment: If heating equipment such as electric heating mantles and muffle furnaces are used in the fume hood, regular maintenance and inspection should be carried out. Ensure that the temperature control of the heating equipment is accurate and the heating elements are in good condition to avoid fires caused by excessive heating. For instance, before using the heating equipment, it is necessary to check whether the temperature sensor is working properly and whether the heating element is damaged or short-circuited.

In terms of operation norms

No smoking or open flames: Smoking, using open flames or performing operations that may produce sparks are strictly prohibited around the fume hood. Post a clear "No Smoking or Fire" sign on the fume hood to remind the operators to pay attention to safety. For instance, when conducting experiments involving flammable reagents, it is essential to ensure that there are no open flame sources in the experimental area, such as lighters and matches.

Standardize experimental operations: Operators must strictly follow the experimental operation procedures to conduct experiments to prevent fires caused by improper operation. For example, when conducting heating experiments, it is necessary to control the heating temperature and time well to avoid the decomposition and combustion of reagents due to overheating. When transferring and mixing flammable reagents, do it slowly and carefully to prevent the generation of static electricity or sparks.

Personnel training: Provide safety training to the operators of fume hoods to ensure they understand the safe usage methods of fume hoods and fire prevention measures. Enhance the safety awareness and emergency response capabilities of operators to ensure that correct measures can be taken promptly for fire suppression and evacuation in the event of a fire. For instance, regularly organize fire safety training and drills for operators to familiarize them with the usage of fire extinguishers and the escape routes in case of fire.