Are there any specific requirements for facilities to prevent liquid leakage?
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According to building codes: 4.2.6 For semi-outdoor storage areas for Class A liquids, bottled storage areas for Class B and C liquids, and liquid storage tanks (areas) with a flash point greater than 120°C, fire dikes may not be required provided that facilities are in place to prevent the leakage of liquids. Explanation of the provisions: Generally, simple dikes made of non-combustible materials such as clay and brickstone, as well as spill containment ponds, are used to prevent the spread of liquids. Should the height of the simple dike or the volume of the oil spill containment area also be calculated based on the largest tank farm, or not?
The height of the simple dike or the volume of the accident oil pool shall be calculated based on the largest tank farm
1. Set up cofferdams. 2. Install an overflow port. 3. Install a high liquid level alarm. 4. Strengthen management of dew point vulnerability
Of course it needs to be calculated; otherwise, if the leaked material overflows the dike, it will lose its protective function
There are requirements regarding the height of the dike～～ The capacity must be greater than the maximum storage volume～～ For the other requirements, just follow what was mentioned for the third floor, and that will be fine
So what’s the difference from a fire dike?
To be precise, there is no such term as \"cofferdam,\" although the word \"cofferdam\" is mentioned in some specifications or standards. However, no relevant requirements for cofferdams can be found in the regulations; in other words, all cofferdams and fire dikes are treated as the same thing, and cofferdams should be designed in accordance with fire dikes.
The cofferdam should be lower in height than the fire dike, right? The cofferdam is meant to prevent a smaller amount of liquid from leaking out compared to the tank area! Personal understanding
In my opinion, installing diversion ditches and collection ponds should also be considered a measure.
For liquid storage tanks or storage areas with a flash point above 120°C, as well as storage sites for liquids of categories B and C in barrels or bottles, and semi-outdoor storage areas for category A liquids (sheds with roofs but no walls), since the likelihood of explosion in liquid storage tanks is low or the amount of liquid that could spill in the event of an explosion in barrelled liquids is small, fire dikes are not necessary provided that effective measures are in place to prevent the spread of liquids. In practice, simple dikes made of non-combustible materials such as clay and brickstone, along with spill containment ponds, are generally used to prevent the spread of liquids.
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