What is the common form of the drain outlet for underground tanks?
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Just a nozzle and a blind flange? Nozzle, valve, and blind flange? Make a small liquid pocket at the bottom of the tank, insert a tube, and use a pump to draw it out? Which one is more common on site? O(∩_∩)O Thank you
I’ve seen ones with a small liquid pocket, which makes it easier to clean and drain
Should a valve and blind flange be added to the nozzle, or should a small liquid pocket be created at the bottom of the tank with a pipe connected to it so that a pump can be used to draw out the liquid? 1. First of all, it’s not very appropriate to use no valve. 2. When does it need to be drained to empty the underground tank containing ethanolamine solution? When it is necessary to have people in to clean it up. 3. What should be done before proceeding with cleaning? Hot water (such as deoxygenated water) can be added for dilution, and then a submersible pump is used to pump the water out as much as possible; this actually also serves the function of an oil skimmer ； Then use steam to drive away any oil or gas that may be present, and finally drain all the water. 4. With the issues from yesterday, this morning I also considered whether I should add a liquid pocket at the bottom of the tank and place the pump’s inlet inside that liquid pocket. ——This, regarding the ability to discharge from the bottom, is essentially a matter of the volume of drainage that can be released; it seems more appropriate for this to be used on underground tanks.
1. What’s meant by “adding a valve” is that having several more flange surfaces makes leakage more likely; it’s simpler to just use a blind plate. 2. Guys, how often do you clean your underground tanks? 4. Even if the pump’s inlet is placed inside a small liquid reservoir, when the pump is turned on to empty the tank, it still has to stop once the liquid level in the large tank drops to a certain level, right? . . What if I find some time?
1. Valves are added when required by the process; there have also been cases where as few valves as possible were used in order to reduce potential leakage points. But there’s little pressure in this tank; it’s not a dangerous substance, so there’s no such issue. 2. The bearings of the submersible pump are graphite bearings, and there is no very strict mechanical seal; as a result, some of the material will continuously flow back through an overflow hole located on the outer support (cylinder) of the rising pump shaft, so there is no risk of the pump running dry.
2. Why doesn’t it get emptied when the liquid level drops below the suction inlet? Even if there is some backflow, it can’t be said that this will prevent evacuation