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Most people know that there are cofferdams around the tank; pumps, process structures and unloading areas for buildings, trucks and rail vehicles, and locations where there is a risk of leakage are provided with slopes. Both cofferdams and slope embankments have important environmental protection functions – preventing soil and surface water from being contaminated. At the same time, they have other important security features.
such as:
â— Limit the spread of fire. When flammable materials overflow and are ignited, it protects other equipment from fire.
â— Prevent contact with other incompatible materials when the reactive material leaks.
â— Limit the spread of corrosive substances that leak, prevent it from coming into contact with and damage the equipment.
In 2001, the American Chemical Safety and Hazard Investigation Commission (CSB) investigated a fire in Texas that destroyed an oil distribution plant. Due to the flaws in the design of the cofferdam and the lack of maintenance, the burning liquid spreads the fire to one tank after another, and eventually the entire factory is swallowed up by the fire.
what can you do
• Regular inspections of cofferdams, slopes, and drains around tanks are included as part of routine factory safety inspections. Pay attention to find out whether there is damage to the appearance, whether there is overflowing material, whether rainwater accumulates in the cofferdam, and whether the sewer is blocked. Be careful to find any obstructions such as debris, equipment, etc. that affect the flow of the spill.
◠Make sure that the factory's system covers the discharge of rainwater from the cofferdam – if there is rainwater in the cofferdam, it cannot cope with the large leak.
â— To discharge rainwater from the cofferdam, if any valves and pipes are installed, make sure they are off when they are not in use, or block them.
â— If repairs or construction are carried out on the cofferdam, the integrity of the cofferdam is destroyed and it is necessary to repair it before the end of the work.
In the above picture, the red arrow refers to a hole in the cofferdam. There are more damage to the bottom and upper part of the cofferdam. Other examples of damage include cracks in the wall and floor of the cofferdam, holes installed through the wall of the cofferdam, and other conditions that allow spilled material to flow out of the cofferdam.
Check and maintain the cofferdams and slopes in your factory!
(Source: Team Security)
[Editor: Chen Guofang]
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