what are the safety knowledge of confined space operation? Please read the article compiled by Zhongda Consulting.

1. Basic knowledge of limited space 1. Definition of limited space: A limited space refers to a space that is closed or partially closed, relatively isolated from the outside world, with narrow entrances and exits, where operators can't work for a long time, and natural ventilation is poor, which is likely to cause accumulation of toxic, harmful, flammable and explosive substances or insufficient oxygen content.

2. confined space operation: refers to the operation activities carried out by workers in confined space.

3. Classification of limited space: (1) Underground limited space: such as basement, underground warehouse, cellar, underground engineering, underground pipeline, culvert, pit, waste well, sewage pool (well), biogas digester, septic tank, sewer, etc. (2) Limited space on the ground: such as storeroom, greenhouse, cold storage, distiller's grains pool, fermentation pool, garbage station, granary and silo, etc. (3) Closed equipment: such as cabin, storage tank, vehicle-mounted tank, reaction tower (kettle), ball mill, cement silo, pressure vessel, pipeline, refrigerator (truck), flue, boiler, etc.

2. Hazards and identification of confined space operations 1. Problems in safety management of confined space operations: (1) Lack of understanding of the dangers of confined space and failure to take necessary safety protection measures. (2) The safety management of confined space operations is neglected and not in place. Organize the operation without ventilation of the operation site, detection of toxic and harmful gases and supervision of protective personnel. (3) The enterprise's safety education and training work is not solid, and the operators lack basic safety knowledge and self-help and mutual rescue ability in limited space operations. (4) The lack of protective equipment and the lack of necessary protective equipment such as self-rescuer and gas mask and gas detection and monitoring instruments. (5) The enterprise has not formulated effective emergency plans. After an accident, the number of casualties often increases due to blind rescue. (6) Some areas have not paid enough attention to the safety supervision of limited space operations, and there are weak links and loopholes. 2. Types of hazardous and harmful factors that may exist in limited space operation Limited space name Main hazardous and harmful factors Closed equipment cabin, storage tank, vehicle tank, reaction tower (kettle), pressure vessel, gas pipeline and equipment are short of oxygen, CO poisoning, volatile organic solvent poisoning, explosion refrigerator, pipeline short of oxygen flue, boiler short of oxygen, CO poisoning above-ground limited space storage room, greenhouse, cold storage short of oxygen distiller's grains pool, fermentation pool is short of oxygen, H2S poisoning, Oxygen deficiency in combustible gas explosion garbage station, H2S poisoning, oxygen deficiency in combustible gas explosion granary, PH3 poisoning, oxygen deficiency in dust explosion silo, oxygen deficiency in dust explosion pit, pool and warehouse, oxygen deficiency in underground limited space, underground works, underground pipelines, culverts, pits, waste wells, sewage pools (wells), biogas digesters, septic tanks, sewers, H2S poisoning, etc. Poisoning; Explosion; Other hazards, such as drowning, electric shock and falling accidents, also include burns and corrosion, and heatstroke caused by high temperature operation; Physical injuries and other mechanical injuries caused by sharp objects. 4. The direct cause of accidents in confined space: the existence of dangerous substances; Poor ventilation, resulting in the accumulation of dangerous hazards; Ventilation and protective measures are not taken, or protective equipment fails; Poor guardianship; Ignition source; Job injury, etc.

III. Requirements for Safety Management of Limited Space Operation 1. state administration of work safety Order No.59 "Interim Provisions on Safety Management and Supervision of Limited Space Operation in Industry and Trade Enterprises" was considered and passed at the office meeting of Director state administration of work safety on February 8, 2113, and is hereby promulgated and shall come into force as of July 1, 2113. 2. Safety management requirements for confined space operations: (1) identification; (2) establishment of rules and regulations; (3) special training; (4) equipment allocation; (5) operation approval; (6) site management; (7) contract management; (8) emergency rescue. 3, industry and trade enterprises should be engaged in limited space operations on-site responsible person, guardian, homework personnel, emergency rescue personnel to carry out special safety training. Safety training shall have special records, which shall be signed and confirmed by the participants.

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