Why are the big chimneys in factories mostly red and white stripes and blue and white stripes? What do you mean?

The red and white ring on the chimney is an aviation obstacle sign, which is a general rule of international civil aviation. China also has many laws and regulations. There are not only colored circular obstacle signs, but also obstacle lights. The following excerpt:

Description of national standards and specifications for chimney design (excerpt)

13 installation of aviation obstacle lights and signs in chimneys 13.6438+0 general provisions

13. 1. 1 Chimney is regarded as an obstacle of aerial vehicles and a hidden danger of flight safety. So chimneys, especially towering chimneys, must be marked with obstacles. A series of administrative regulations stipulate that aviation obstacle lights must be installed, such as Civil Aviation Law promulgated by China Government, Regulations on Aviation Clearance Protection formulated by the State Council, and Airport Clearance Protection Document issued by the State Council and Central Military Commission. 13.2 aviation obstacle lights and signs

13.2. 1 Annex XIV of the Convention on International Civil Aviation has perfect technical requirements and strict regulations on the installation of obstacle lights in chimneys, especially in high-rise chimneys. The technical standard of "MHJ 1-85" flight area formulated by Civil Aviation Administration of China refers to this standard.

13.2.2 For tall chimneys, using high-intensity flashing white obstacle lights is the most effective way to indicate the existence of high obstacles. Whether in day, dusk or night, cloudy or foggy climate, anti-solar time, etc., it is easy to identify.

13.2.3 according to article 6.2 of annex 14 to the convention on international civil aviation. The banded signs of chimneys are annular, which are generally divided into seven according to the total height of chimneys, and the color bandwidth does not exceed 30m. 13.3 installation and distribution of aviation obstacle lights.

13.3- 13.3.6 the distribution and marking requirements of aviation obstacle lights in the chimney are shown in figure 13.4.

13.4. 1 Obstacle lights on the chimney should flash at the same time, and control equipment should be added. In order to ensure normal operation, it is necessary to use power supply for the equipment.

The standard 13.4.2 stipulates that when setting up obstacle lights, consideration should be given to avoid making residents feel unhappy, and only scattered light can be seen from the ground.