A dike is usually installed in the acid and alkali storage area. Is there a fixed requirement for the height of this dike? Urgent! Urgent! Urgent! ! !
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A dike is usually installed in the acid and alkali storage area. Is there a fixed requirement for the height of this dike? Urgent! Urgent! Urgent! ! !
The height of the cofferdam next to the salt acid tanks that I’ve seen is very low, around 200 mm. This mainly relates to the distance over which the spray is emitted, the discharge capacity of the outlet, as well as the supply capacity of water for dilution and neutralizing agents.
This post was last edited by Donghai Shui on 2016-5-31 08:15. It is recommended that you refer to the relevant sections of the Building Code GB50016 and the Petrochemical Code GB50160. The volume enclosed by the cofferdam is likely to be half of the capacity of the largest tank inside it; the designed height should be 0.2 meters higher than the calculated height, and it should range from 1.0 to 2.2 meters. P41-42: For liquefied hydrocarbons and liquid ammonia, it is around 0.5 meters.
It was called a cofferdam before; now it’s called a retaining dike. The requirements are the same as for a fire dike
There are no regulations regarding this in building codes or petrochemical industry standards; what is specified are dikes and fire dikes. The height of these cofferdams is generally quite low, around 20 CM, with the purpose of collecting any small amounts of liquid that leak into a sewage lift tank for further treatment.
Yes, there is a difference between fire dikes and cofferdams; a cofferdam with a height of over 150 cm will suffice
According to SH3011-2011 \"Code for Design of Layout of Petrochemical Process Units\", 3.0.18: Dikes should be installed in areas that may be contaminated by flammable liquids, corrosive media, or toxic substances during operation or maintenance; equipment areas dealing with corrosive media should also have anti-corrosive flooring. The installation of the cofferdam shall meet the following requirements: a) The height of the cofferdam above the cofferdam area shall not be less than 150 mm ； b) The cofferdam should be equipped with drainage facilities ； c) The ground inside the cofferdam should slope toward the drainage facilities, with a slope gradient of not less than 0.003.
The SH3011-2011 \"Code for the Layout Design of Petrochemical Process Units\" mentions this in the context of \"operation or maintenance\", but what about storage areas contaminated by corrosive media or toxic substances?
Well, the regulations only specify the requirement for fire dikes for flammable media; there are no guidelines on how to calculate the height of fire dikes for materials that are not flammable but are corrosive.
Code for Layout Design of Petrochemical Plants GB50984-2014 4.4.8 The layout of storage tanks for toxic and corrosive liquids shall meet the following requirements: 1 They should not be located near roads with heavy pedestrian traffic or major production facilities； 2 The tank group shall be provided with a protective dike, and the effective volume within the dike shall not be less than the volume of the largest tank in the group ； 3 The distance from the vertical storage tank to the inner foot line of the retaining dike should not be less than half of the tank wall height ； 4 The floors, drainage ditches, and sump pits within the corrosive liquid tank area should be treated to prevent corrosion.