This standard is applicable to distinguishing the degree of harm of workers exposed to industrial dust, and is the basis for scientific management of labor protection. This standard does not apply to radioactive dust and hazardous dust that causes chemical poisoning. GB 5817-1986 Classification of the degree of harm of industrial dust operation GB5817-1986 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Classification of hazard levels due to exposure to industrial dust
UDC 628.511
.001.33
GB 5817—86
This standard is applicable to distinguishing the degree of hazard of workers' exposure to industrial dust and is the basis for scientific management of labor protection. This standard does not apply to radioactive dust and hazardous dust that causes chemical poisoning. 1 Basic definition
1.1 Industrial dust
Solid particles that can float in the air for a long time during the production process. 1.2 Work with exposure to industrial dust
Work in which workers engage in production labor at a workplace with industrial dust. 1.3 Workplace
A place where workers often or regularly stay to observe, operate and manage the production process. 1.4 Free silica content in industrial dust The mass percentage of crystalline free silica in industrial dust. 1.5 Dust exposure time
The actual dust exposure time in a working day. 1.6 Worker dust exposure time Total lung ventilation
Refers to the total volume of air containing industrial dust inhaled by workers during the dust exposure time of a working day. 1.7 Maximum allowable concentration of industrial dust
Refers to the maximum allowable concentration value of harmful substances in workshop air in Table 4 of TJ36-79 "Industrial Enterprise Design Hygiene Standard". 1.8 Exceeding multiples of industrial dust concentration
The multiples of the dust concentration in the air measured at the workplace that exceed the maximum allowable concentration of this type of industrial dust. The number of samples at each sampling point shall not be less than five, and the arithmetic mean of the exceeding multiples shall be taken. 2 Classification of Hazard Levels of Works Contacting Industrial Dust 2.1 The hazard levels of work contacting industrial dust are divided into five levels: Level 0
Level I Hazard
Level II Hazard
Level II Hazard
Level IV Hazard
2.2 This standard classifies asbestos dust, which is carcinogenic to humans, as a category with free silica greater than 70% in this standard. 2.3 Based on the three indicators of free silica content in industrial dust, total lung ventilation during worker exposure to dust, and the multiple of industrial dust concentration exceeding the standard, the hazard level of industrial dust work is classified according to the following table. Issued by the National Bureau of Standards on January 21, 1986
Implemented on November 1, 1986
Content of free silicon dioxide in production dust, %
>10 ～ 40
>40 ～70
GB 5817-86bZxz.net
Grading table for the degree of hazard of production dust operationsDust exposure time for workers
Total lung ventilation
(L/day, person)
～4000
～4000
~ 6000
～6000
Multiple times of production dust concentration exceeding the standard
GB 5817—86
Appendix A
Determination of free silicon dioxide content in industrial dust (supplement)
A.1 Sampling method for determining free silicon dioxide content in industrial dust The floating dust or deposited dust samples near the breathing zone of workers' regular work places should be collected. The factory should collect dust samples for three consecutive days and mix them before determination. Mines should select representative work places in mining for sampling, and the same dust samples should be no less than 3 copies.
A.2 Analysis of free silicon dioxide content in production dust A.2.1 Analysis steps
Accurately weigh 0.1-0.2g of production dust sample and put it into a conical flask (if it is a carbon or organic dust sample, it should be completely incinerated at 800-900℃ before analysis. If it is a sulfide mineral, several milligrams of crystalline ammonium nitrate should be added to the conical flask first), then add 15ml of pyrophosphoric acid, quickly heat to 245-250℃, keep it for 15 minutes, and then cool it to 40-50℃. During the cooling process, add 50-80℃ distilled water to dilute it to 40-50ml. When diluting, add water while stirring vigorously to mix, and then dilute it to 150-200ml with water. Filter it with ash-free filter paper, wash the sediment with 0.1N hydrochloric acid, and then wash it with hot distilled water until there is no acidic reaction. Finally, place the filter paper with sediment in a constant weight porcelain crucible, dry it in an oven at 80°C, and after low temperature carbonization, place it in a high temperature furnace at 800-900°C and burn it for 30 minutes. Then, place it in a desiccator to cool for 1 hour and weigh it to constant weight. A.2.2 Calculation method of free silicon dioxide content in production dust The free silicon dioxide content in production dust is calculated according to formula (1): SiO, (F) =
- free silicon dioxide content, %:
In the formula, SiO, (F)
Crucible mass, g,
Crucible plus sediment mass, g
- production dust sample mass, g.
A.2.3 Treatment of insoluble impurities in dust X100
A.2.3.1 When there are impurities in the production dust sample that are difficult to be dissolved by pyrophosphoric acid (such as silicon carbide, beryl, etc.), the sample sediment after pyrophosphoric acid treatment needs to be placed in a platinum crucible, and several drops of 1:1 sulfuric acid are added to moisten the sediment, and then 5-10 ml of 40% hydrofluoric acid is added. Slightly heat to dissolve the free silica in the sediment, and continue heating and evaporation until no white smoke is emitted. Burn at a high temperature of 900℃ and weigh to constant weight. A.2.3.2 Calculation method of free silica content after impurity treatment The free silica content after impurity treatment is calculated according to formula (2): SiO2(F)
Where: M2\—Mass of crucible sediment, g; -Mass of residue after hydrofluoric acid treatment, g; M3
—Free silica content, %.
A.3 This method is the basic method. If X-ray diffraction measurement method or infrared spectroscopy measurement method is used, it must be checked with this method. (2)
B.1 Determination of workers' dust exposure time
GB 5817-86
Appendix B
Method for determining total lung ventilation during workers' dust exposure time (supplement)
Under normal production tasks, select no less than 2 representative workers for each dust-exposed job, and record the time of various labors and breaks during the entire working day from the start of work to the end of get off work in the format of Table B1, and indicate the dust exposure situation separately. Each measurement object should record for 3 consecutive days, and take the average value of the 3 days to represent the total dust exposure time, the cumulative dust exposure time of various labors, and the cumulative dust exposure time of rest for the workers of this job in one working day. Table B1 holds
Dust exposure working hours record
Action start time, h, min
Action content
Dust exposure situation
Cumulative dust exposure time, min
B.2 Determination of total lung ventilation during dust exposure time
According to the records in Table B1, various dust exposure working times and dust exposure rest times are classified (similar activities are classified into one category), and then the exhaled air of workers during dust exposure rest times and various dust exposure working states is collected, the volume of the gas is measured, the exhaled volume values ​​during dust exposure rest times and various dust exposure working states are calculated, and converted into the volume value of dry gas under standard conditions. Then convert it into the expiratory volume per minute according to Table B2 [standard state expiratory volume, L/gas collection time, min], and finally multiply the expiratory volume per minute during various dust-exposed labor and dust-exposed rest by the corresponding cumulative time of each dust-exposed labor and cumulative time of dust-exposed rest, and the sum is the total lung ventilation volume of the worker during the dust-exposed time in one working day (L/day·person). Table B2
Dust-exposed action (and dust-exposed rest) Content
Determination of total lung ventilation volume of workers during dust-exposed time in one working day Record expiratory volume, L/min
Dust-exposed cumulative time
Dust-exposed total lung ventilation, L
L/day·person
Additional instructions:
This standard was proposed by the Labor Protection Bureau of the Ministry of Labor and Personnel. GB5817-86
This standard was drafted by the Health Research Institute of the China Preventive Medicine Center. The main drafters of this standard are Cheng Yuhai, Fu Shaochang, Zou Changqi, Zhu Huilan, Wang Zhaodian and Xue Jiayao.
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