Pump selection for acid waste tanks
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We have a project that features an acid waste tank (an underground tank) with a depth of 3600 mm. The density of the waste acid (which contains butyl acetate) is 1.5, the pump’s flow rate is 5 m3/h, and its head is 30 m； We started by considering fluoroplastic submersible pumps, but the manufacturer stated that it was not possible to achieve a submersion depth of 3.6 meters ； Then we want to choose a fluorine-lined self-priming pump, but its self-priming depth is not even 3.6 meters. Additionally, there is the issue of priming the pump at startup; if water is used as the medium, it will mix with the waste acid (a strong acid), resulting in heat generation, and this poses a problem for priming ； Dear experts, please help me figure out which pump would be more suitable Of course, price is also a factor. . .
If a high self-priming capacity is required, a twin-screw pump will work fine. What are the main components of waste acid? Is there a proportion as high as 1.5? How is the fluidity of the spent acid? Can 304 withstand corrosion?
The main medium is concentrated sulfuric acid + butyl ester; its specific gravity is around 1.5, it contains no particulate impurities, and it has decent flow properties. However, 304 material cannot withstand corrosion
Well, the specific gravity of concentrated sulfuric acid is around 1.5, and 304 steel indeed cannot withstand it. What material is your tank made of?
The pool takes anti-corrosion and waterproofing measures into account, using granite；
Okay, I sent you a message
I came in excitedly after seeing the title, only to find that fluoroplastic pumps really are useless and can’t be used. There is no cure; the only option is to try using a fluorinated centrifugal pump and create a siphon tank. 3.6 should not be difficult.
We are using the vertical long-shaft pump VS4 from Lewis in the United States, made of Lumite alloy. We have just purchased 6 units of such pumps for our alkylation unit, which are also used for treating spent acid
The most annoying aspect of these pools is that submersible pumps have always been a problem. Leaks and rainwater intrusion are even more troublesome. During personnel operations, the bottom of the pool also needs to be flushed with circular air pipes.
This post was last edited by liuzhihui125 on 2018-8-14 at 16:19. We often use waste acid; for our applications we use siphon tanks along with engineering plastic pumps (ordinary engineering plastic pumps are sufficient for temperatures below 70°C, and they are also inexpensive; for temperatures above 70°C, the type of plastic needs to be taken into consideration). A tank located 5 meters underground is no problem at all. With a flow rate of 5 m³ and a head of 30 meters, there’s absolutely no issue. :victory:
It’s not certain whether a diaphragm pump can achieve such a high suction lift; it’s advisable to consult the manufacturer.