This standard stipulates the allowable continuous heat exposure time and rest time limits for workers working in high temperatures. This standard applies to general indoor high-temperature operations. You can also refer to this when adjusting the working hours for special high-temperature operations or temporary high-temperature operations. This standard does not apply to open-air operations with high temperature and strong radiant heat [radiation intensity exceeding 12.56J/(cm2·min) or 3cal (cm2·min)]. GB 935-1989 Allowable continuous heat exposure time limit for high-temperature operations GB935-1989 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Limit value of allowable continuous heat exposure time in hot environment1 Subject content and scope of application
This standard specifies the allowable continuous heat exposure time for workers working in high temperature Time and break limits. GB 935— 89
This standard is applicable to general indoor high-temperature operations. You can also refer to this when adjusting the working hours for special high-temperature operations or temporary high-temperature operations.
This standard does not apply to open-air operations with high temperature and strong radiant heat [radiation intensity exceeding 12.56J/(cm2·min) or 3cal/(cm2·min)]. 2 Reference standards
GB934 Method for determination of meteorological conditions in high-temperature working environments 3 Terminology
3.1 Work in hot environment refers to industrial enterprises and service industry workplaces with productive heat sources. When summer actually occurs outdoors in the region, When calculating the temperature for outdoor ventilation design, the temperature at the work site is 2°C or more than the outdoor temperature. 3.2 Work place work piace
refers to the place where workers need to stay frequently or regularly to observe production conditions or perform production operations. If due to the needs of the production process, operations must be performed at different locations within the workshop, the entire workshop is called a work site. 3.3 Productive heat sources: Production equipment, products and workpieces that can often dissipate heat during the production process. 3.4 Allowable continuous heat exposure time, ACHET refers to the time that workers are allowed to work continuously in a hot environment. 3.5 Necessary rest time Necessary rest time, the rest time necessary to ensure the recovery of physiological functions after NRT continues to be exposed to the thermal environment. 3.6 Temperature of workplace refers to the temperature determined for the working place in accordance with the principles required by this standard and the relevant provisions of Chapters 5, 6 and 7 of GB934 for the purpose of arranging working hours. 3.7 The difference between indoor and outdoor temperature is the difference calculated after actual measurement of the working place and outdoor temperature. 4 Limits of allowable continuous heat exposure time for high-altitude operations 4.1 The allowable continuous heat exposure time under different working location temperatures and different labor intensity conditions shall not exceed the values ??listed in Table 1. State Bureau of Technical Supervision approved on 1989-03-22 for implementation on 1989-10-01
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Working place temperature
C
30~32
> 3234
≥34~36
>36~38
>3840
>40～42
>42~44
table 1
Light
GB935-89
Permissible continuous heat exposure time limit for high-temperature operations
80
70
60| |tt||50
40
30
20
moving
中
waiting
labor||tt ||70
60
50
40wwW.bzxz.Net
30
20
10
moving
4.2 The necessary rest time after continuous exposure to heat shall not be less than 15 minutes. Get out of the hot environment when resting. heavy
labor
motion
60
50
40
30
20
15| | tt | | 10 | | tt | | min | Time limit for the working place temperature to be 2°C. 4.4 Please refer to Appendix B (Supplement) for the deadline for adjusting working hours in each region. 24
A1 Determination of working place temperature
GB935—89
Appendix A
Determination of working place temperature, labor intensity, and air humidity (supplement)||tt ||A1.1 Temperature difference
When the outdoor temperature is equal to or greater than the calculated outdoor ventilation design temperature in summer in the region, the working place and outdoor temperatures are measured simultaneously under the condition that local cooling measures are stopped. The temperature measurement at the workplace should be done at a location where workers often or regularly stay; the outdoor temperature measurement should be done at a relatively open place upwind of the workshop. The measurement time is between 13:00 and 14:00 on the representative day of the hottest month in summer. Take the average value of three consecutive days to calculate the temperature difference.
A1.2 Working place temperature
Determine the working place temperature based on the maximum temperature plus the temperature difference in the weather forecast of the local meteorological station. A2 Determination of labor intensity
The labor intensity is determined based on the average pulse rate for a single operation. If there are multiple movements of labor during the operation, and the labor intensity varies greatly between each movement, measure the pulse rate of each movement separately. Calculate the average pulse rate. Sporadic operations lasting less than 2 minutes will not be considered. For the pulse rate measurement method, 46 workers in the same working group were selected. During the labor process, their pulses were measured 5 minutes after the start of work, and the pulse rate was counted for 0.5 to 1 minute. If the average pulse rate is less than 92 beats/min, it is light work, if it is 93 to 110 times/min, it is medium work, and if it exceeds 110 times/min, it is heavy work.
Determination of A3 air humidity
should be measured with a ventilation thermohygrometer. The point selection and number of measurements are the same as those of temperature. Appendix B
Adjustment of working hours in various regions
(supplement)
Table B1 Time when the five-day average maximum temperature is higher than 30℃ in major cities across the country City name
Beijing
Shijiazhuang
Hohhot
Changchun
Shanghai
Hangzhou
Fuzhou
Jinan
Wuhan| |tt||Start and end time
(month, day)
6.1~8.30
6.1~~8. 30
6.1~~7.30
7 . 1～8. 15
6.15~8.30
6.15-8.30
6.15~~9.15
6.1~~8.30
6. 1 ~~ 9.15
City name
Tianjin
Taiyuan
Shenyang
Harbin
Nanjing
Hefei
Nanchang
Zhengzhou
Guangzhou
Start and end time
(month, day)
6. 1~8.30
6. 1~8.15| |tt||6. 15~-8. 15
7. 1~8. 15
6.18.30
6.15~8.30
6.15~9.15|| tt||6. 1 8. 30
6. 1～10.15
25
Ct
City name
Nanning
Chengdu
Yinchuan
Guiyang
Start and end time
(month, day)
6. 1 ~~10. 15
6.1~8.30
6.15~7.30
7.1~8.30
Note: Above: The table is excerpted from the National Meteorological Administration data from 1980 to 1983. GB 935—89
Continued Table B1
City name
Changsha
Xi'an
Urumqi
Lanzhou
Appendix| |tt||Examples of application of limits on the allowable continuous heat exposure time for high-temperature operations (reference parts)
How to arrange the summer labor time of brick and mortar kiln workers? Determine the temperature of the working place
Measure the temperature of the working place and the outdoor temperature, and calculate the temperature difference. Start and end time
(month, day)
6.1~9.15
6. 1 ~8. 15
6.15~8.15 | 32℃, 32℃, the average temperatures inside the kiln and outside are 36.8℃ and 31.8℃ respectively, with a temperature difference of 5℃. According to weather forecast data, it will be mainly sunny in the near future, with a maximum temperature of 30°C, so the temperature at the work site should be determined to be 35°C (that is, 30°C plus 5°C). C2 determines the labor intensity of this type of work
Since workers of this type of work have two actions during operation, one is stacking bricks and the other is pushing carts, the pulses of these two actions should be measured separately.
The pulse rate measurement results of four workers were 105 times/min, 112 times/min, 120 times/min, 115 times/min when stacking bricks, and the average was 113 times/min. When pushing the cart, the speed is 106 times/min, 92 times/min, 98 times/min, 93 times/min, and the average is 97 times/min. The average pulse rate of the two operations is 105 times/min. According to the requirements of A2 in Appendix A, the labor intensity of the kiln installer is determined to be medium. C3 table 1 shows that the sealing workers are allowed to work in a high-temperature environment for no more than 50 minutes and must rest for at least 15 minutes before entering the high-temperature environment again.
Additional notes:
This standard is under the jurisdiction of the Labor Environment Sub-Technical Committee of the National Ergonomics Standardization Technical Committee. This standard was drafted by the Physical Factor Research Office of the Beijing Institute of Occupational Disease Prevention and Control and the Occupational Health Teaching and Research Office of Nanjing Railway Medical College of the Ministry of Railways.
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