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Some jars are yellow, while others are silver-white. What properties do these jars represent? Could you be more specific?
In the petrochemical industry, light oil tanks (gasoline or diesel) are typically painted silver-white, heavy oil tanks are painted gray, tanks containing alkali or ammonia are painted yellow, water tanks are painted green, and foam tanks and foam lines are painted yellow. For specific details, refer to the relevant regulations on applying marking colors in the petrochemical industry.
Most heavy oil tanks these days use galvanized iron sheet as the outer protective layer, so there is no need for a marker color
Yeah, nowadays light oil tanks are generally painted silver-white. Chemical products are all yellow.
In accordance with general labeling requirements: water (light green) \ steam (sea gray) \ mineral oils, vegetable oils, animal fats, flammable liquids (light brown) \ gaseous or liquid gases (except air and oxygen) (iron yellow) \ acids and bases (light purple) \ air or oxygen (light phthalo blue) \ other liquids (black).
I can’t remember exactly, but the standards specify it clearly
The colors specified by standards are merely provided as a reference for industry owners and are not mandatory. In reality, to accurately determine the stored substances, it is best to ask the personnel on duty at that particular unit, especially in small and medium-sized enterprises
SH/T 3043-2014 Specifications for Surface Color and Marking of Steel Structures for Pipelines in Petrochemical Equipment
Given the practicality of insulation, white or off-white is more common. Personal opinion, for reference only.