The challenge of pump selection
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My company has a suspension of a reactant, and this mixture contains dilute sulfuric acid, which causes severe corrosion to the pipes. We are currently using ordinary packing pumps, and the material causes significant corrosion to these pumps; we have to repair them almost every day. Is it possible to use a different type of pump? We later applied for a pump made of 316L material for water cooling – will it work effectively?
316L material is not resistant to corrosion by dilute sulfuric acid; it is recommended to use fluoroplastic pumps
Fluoroplastic pumps are the best choice
Use a mechanical seal with a ceramic or stainless steel rotating ring and a graphite-impregnated resin stationary ring; 316L pumps can be used, but fluorinated-lined pumps are better, and it is ideal to use fluorinated-lined pipelines as well.
What the classmate above said is correct – stainless steel does not resist dilute sulfuric acid; therefore, it is recommended to use fluoroplastic centrifugal pumps, or pumps with a steel lining covered in PTFE
It is unknown what the viscosity and specific gravity of the medium being pumped are, as well as whether it contains solid particles. If the viscosity is not high, the density is not greater than 1.85, and there are no solid particles present, a fluoroplastic magnetic pump can be used. Fluoroplastic magnetic pumps have strong corrosion resistance and no leaks!
In cases like this, a fluorine-lined centrifugal pump is an excellent choice – it offers great value for money!
Fluoroplastic centrifugal pumps are used, with ceramic mechanical seals.
Fluorinated composite pipes offer excellent performance across various aspects.
If the solid content is below 5%, use a fluorocarbon-lined magnetic pump. If it is above 5%, use a pneumatic diaphragm pump (if an air supply is available)
I hope the original poster can provide detailed parameters; doing this is a waste of other people’s time. What if the temperature of the material is very high (above 150 degrees) or the flow rate is high (several thousand cubic units)? Would the suggestions given above still be useful in such cases?
Does your medium contain particles in addition to dilute acid? If that’s the case, choosing a fluoroplastic pump won’t work either! It is best to choose a wear-resistant and acid-resistant pump made of PVDF! Of course, the temperature shouldn’t be too high; it’s best to keep it below 120°, with a maximum of 150°