GB 8958-1988 Safety regulations for oxygen-deficient hazardous operations
Some standard content:
National Standard of the People's Republic of China
Safety regulation for working under hazardous conditions of the oxygen deficiencyUDC 614. 8
：628.55
GB 8958-88
This standard is formulated to ensure the safety and health of workers in oxygen-deficient environments and prevent the occurrence of oxygen-deficient accidents. 1 Subject content and scope of application
This standard specifies the definition and safety requirements of oxygen-deficient hazardous work. This standard applies to all operations with oxygen-deficient hazards. 2 Definitions
2.1 Oxygen deficiency: refers to the state where the oxygen concentration in the air is lower than 18%. 2.2 Oxygen-deficient hazardous work: refers to various operations with potential and obvious oxygen-deficient hazards. 2.3 General oxygen-deficient work: refers to simple oxygen-deficient hazardous work in ordinary workplaces. 2.4 Special oxygen-deficient work: refers to oxygen-deficient hazardous work in special workplaces or with the presence of other harmful gases. 3. The oxygen-deficient hazardous working environment can be roughly divided into three categories: 3.1. Closed equipment: refers to cabins, storage tanks, reaction towers, refrigerated trucks, caissons and boilers, etc. 3.2. Underground limited space: including underground pipelines, basements, underground warehouses, underground fortifications, culverts, tunnels, culverts, pits, mines, waste wells, cellars, biogas pools and septic tanks, etc. 3.3. Above-ground limited space: including storage rooms, wine lees pools, fermentation pools, garbage stations, greenhouses, cold storage, granaries, closed workshops or laboratories, etc. 4 General requirements for oxygen-deficient work and safety precautions 4.1 Before work
When engaging in any work with oxygen-deficient hazards, in accordance with the principle of testing before work, the oxygen concentration in the working environment must be accurately measured before the work begins, and the following items must be recorded: a.
Measurement date;
Measurement time;
Measurement location;
Measurement method and instrument;
On-site conditions during measurement;
Measurement times;
Measurement results.
Before the oxygen concentration is accurately measured, it is strictly forbidden to enter the workplace. 4.1.2 Take corresponding measures according to the measurement results, and record the key points and effects of the measures taken. Approved by the Ministry of Labor and Personnel of the People's Republic of China on March 30, 1988298
Implemented on November 1, 1988
4.2 During operation
GB8958-88
During the operation, the changes in the oxygen concentration in the working environment air should be monitored and necessary measures should be taken at any time. In the operation where the oxygen concentration may change, the necessary number of measurements or continuous monitoring should be maintained. 4.3 Main protective measures
4.3.1 Monitoring personnel must be equipped with accurate and reliable analytical instruments, and they should be calibrated and maintained regularly. 4.3.2 In the workplace that has been determined to be an oxygen-deficient environment, sufficient ventilation measures must be taken to keep the oxygen concentration in the ambient air above 18% during the operation. It is strictly forbidden to use pure oxygen for ventilation. 4.3.3 For places where ventilation measures cannot be adopted due to explosion-proof and oxidation-proof measures or where ventilation is not easy to be fully provided due to the working environment, the operators must be equipped with and use air respirators, oxygen respirators or hose masks and other respiratory protection devices. It is strictly forbidden to use filter masks.
4.3.4 When there is a risk of falling due to lack of oxygen, the operators must use safety belts and reliably install necessary safety rope net equipment in appropriate positions.
4.3.5 Before each operation, the breathing apparatus and safety belts must be carefully checked. If any abnormality is found, they should be repaired or replaced immediately, and it is strictly forbidden to use them reluctantly. 4.3.6 The number of operators should be accurately counted before entering and leaving the hypoxic environment. 4.3.7 When working in an environment with the risk of hypoxia, supervisors must be arranged to closely monitor the working conditions. If any abnormality is found, effective measures should be taken in a timely manner.
4.3.8 The operators and supervisors should stipulate clear contact signals in advance. When the danger of hypoxia is found, the operation must be stopped immediately and the workers must leave the work site quickly. 4.3.9
4.3.10 If the danger of hypoxia at the work site may affect the safety of workers in nearby work sites, these work sites should be notified in time. It is strictly forbidden for unrelated personnel to enter the hypoxic work site, and signs should be made in conspicuous places. 4.3.11
4.3.12 In the workplace where there is a risk of hypoxia, rescue equipment must be equipped. Such as: respirators, ladders, ropes and other necessary equipment and equipment. In order to rescue workers in emergency situations. 4.3.13 When the danger of hypoxia occurs, the workers and rescuers must immediately use isolated respiratory protective equipment. 4.3.14 Workers who have suffered from hypoxia should be given first aid and medical treatment immediately. 5 Special work requirements and safety protection measures
5.1 The following hypoxic work should be treated as special work: 5.1.1 Harmful gases exist in the air of the workplace at the same time. 5.1.2 Harmful gases are used or may be generated during the operation. 5.1.3 Operations in special places.
5.2 Operation requirements and protective measures
5.2.1 All provisions in Chapter 4 apply to this type of operation. 5.2.2 When harmful gases are present in the air of the workplace, the concentration of harmful gases must be measured at the same time as the oxygen concentration, and corresponding measures must be taken based on the measurement results. Operations can only be carried out after the air quality in the workplace reaches the standard. 5.2.3 When drilling, tunneling and other operations are carried out, the workers are in danger of suffering from hypoxia and poisoning syndrome due to the escape of harmful gases such as hydrogen sulfide, carbon dioxide or methane. Predictive investigations must be carried out using methods such as test drilling. When the above gases are found to exist, the treatment method should be determined first, the operation plan should be adjusted, and then the operation can be carried out.
5.2.4 When welding with argon, carbon dioxide or ammonia in a closed container, ventilation must be carried out during the operation to keep the oxygen concentration above 18%, or the workers must use isolated respiratory protective equipment. 5.2.5 When carbon dioxide fire extinguishers are installed in workplaces with poor ventilation conditions, such as basements and cabins, the fire extinguishers should be placed firmly and are prohibited from being started at will to prevent accidental leakage of carbon dioxide. It is recommended to set up obvious signs at the location where the fire extinguishers are placed. 5.2.6 When operators are working inside special places (such as cold storage, cold storage rooms or closed equipment, etc.), if the doors or covers for operators to exit cannot be easily opened from the inside and there are no communication or alarm devices, it is strictly forbidden to close the doors or covers. 299www.bzxz.net
GB8958-88
5.2.7 When operators are working inside closed equipment connected to the transmission pipeline (such as oil tanks, reaction towers, storage tanks, boilers, etc.), the valves must be tightly closed or blind plates must be installed. The valves of pipelines that transport hazardous substances should be guarded by someone, or signs prohibiting starting should be set up in conspicuous places. 5.2.8 When operators are working in closed equipment, the doors or covers of the entrances and exits should generally be opened. If the equipment is connected to a pipeline that is being evacuated or is already in a negative pressure state, it is strictly forbidden to close the door or cover of the exit. 5.2.9 When performing compressed air operations underground, oxygen-deficient air should be prevented from leaking into the workplace. If there is oxygen-deficient air in the facilities connected to the workplace, it should be discharged directly to prevent oxygen-deficient air from entering the workplace. 6 Safety Education and Management
6.1 Safety education for oxygen-deficient operations for the person in charge of the operation should include the following contents: 6.1.1 Regulations related to oxygen-deficient operations.
6.1.2 Causes of oxygen-deficient hazards, symptoms of oxygen deficiency, occupational contraindications, preventive measures, and first aid knowledge for oxygen deficiency. 6.1.3 Common knowledge of the use, inspection, and maintenance of protective equipment, respiratory protective equipment, and rescue equipment. 6.1.4 Methods for measuring the concentration of oxygen in the air of the workplace and harmful substances. 6.2 A completion certificate should be issued after the completion of the oxygen-deficient operation safety education. People who have not received safety education shall not serve as the person in charge of the operation. 6.3 Safety education for general workers should include the following contents: 6.3.1 Asphyxiation hazards and safety operation requirements in oxygen-deficient places. 6.3.2 Knowledge of the use of protective equipment, respiratory protection equipment and rescue equipment. 7 Management
7.1 The labor and technical safety management department is responsible for supervising the implementation of this standard. 7.2 Before carrying out oxygen-deficient hazardous operations, it is necessary to report to the superior department for approval and determine a qualified person in charge of the operation. 7.3 Each department shall formulate implementation rules based on this standard. Additional notes:
This standard was proposed by the Beijing Labor Protection Science Research Institute. This standard was drafted by the Beijing Labor Protection Science Research Institute. The main drafters of this standard are Xia Yuliang, Huang Chongyi and Cao Zhonghe. 300
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