Installation of inspection wells at gas stations
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In the design of gas stations, to check whether oil tanks are leaking, a common practice is to install an observation well near the tank area; this observation well is connected to the tank area through pipes or hidden channels. When an oil tank leaks, oil will flow into the observation well via these pipes or channels. What are the appropriate dimensions and depth for such an observation well? Of course, leak detection equipment can also be installed, but for small gas stations (grade 3), I believe such equipment is an overkill and results in additional costs. I would like to ask if there are any better ways to detect oil leaks?
Right now, I’m also working on the design of such a gas station. I wonder if the original poster knows how to set up inspection wells now? If you know, could you tell me?
It is recommended to install anti-floating devices when constructing the tank pit. Design a slope, and then install a cement pipe with a diameter of about 300 mm for observation! ! For reference! ! !
I’m ignorant – why do gas stations need oil storage tanks? Isn’t burying it directly in the ground quite simple?
Gas station inspection wells are not currently widely installed, but they are necessary; their use should be promoted in future design standards
1. Check the ditches around the oil tank and the tank foundation daily; the presence of oil stains indicates oil leakage at the bottom of the tank. 2. Utilize daily inventory checks, gauge measurements, or measurement instruments to detect any drop in the oil level of stationary tanks, which indicates the presence of a leak. 3. The effect of the observation well was not as good as expected, because the diameter of the tank foundation is large, and there are concrete ring beams around it; therefore, even if oil leaks, it is unlikely to flow into the well. 4. Some other methods for inspecting oil films, cables, and optical fibers are not widely used in actual oil depots in China.
If leak-proof tanks are used, the bottom of the tank should have a certain slope; generally, a sump well is installed at the lowest point, and an inspection well is placed vertically inside this sump well. We usually use DN150 steel pipes, with holes drilled in their lower part. Another approach involves placing a pipe horizontally along the length direction at a depth of 300 mm directly below each oil tank, giving it a certain slope; holes are made in the upper part of this pipe. All the lowest points of these pipes are then connected together with a vertical pipe that leads to the ground surface. By checking for accumulated water or odors inside, it is possible to determine whether there is a leak in the oil tanks. This method is suitable for directly buried oil tanks.
A lower tank should be installed beside the oil tank’s leak-proof pool, at a level 200-300 mm lower than that of the leak-proof pool. The bottom of the leak-proof pool should have a slope leading toward the oil collection tank, and leak detection pipes should be used to check for any leaks. Another issue is: what should be done if a leak is detected? Is there a difference in the way minor oil leaks and major oil leaks are handled?