I need help with a problem regarding centrifugal pumps for concentrated sulfuric acid
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Hello everyone, I’m reaching out for help. As our company has launched a new product, a nitration process is required, which involves the use of fuming sulfuric acid and concentrated nitric acid. These two acids need to be transferred from the storage tanks to the reaction vessels using centrifugal pumps. There are a few points that are not clear at the moment; please give me some guidance, senior. 1: For the pipeline segment from the discharge outlet of the centrifugal pump to the reaction tank, how can we prevent concentrated acid from remaining in the pipeline after the centrifugal pump stops operating? If such residue remains, it is not only dangerous but also causes corrosion of the pipeline. How should this pipeline for the centrifugal pump be installed? 2: Relevant pipeline technical standards, **is mandatory acceptance required?
This is a problem: the concentrated sulfuric acid we have here needs to be transported at heights of several meters, and the pump outlet pipeline is always filled with concentrated sulfuric acid! What you mentioned really does deserve some consideration~
The outlet pipe should be vertical or at an upward angle; open the inlet valve to allow the sulfuric acid in the pipe to flow back into the sulfuric acid tank.
Isn’t your material acid-resistant? Why are you still worried about corrosion? It would be so troublesome to have to purge the pipes every time after pouring the material.
There are two issues here. One is the problem of installing the pipes at an inclined angle, and the other is the issue of cleaning the material inside the pipes. For the inclined installation of the pipes, a slope of around 2.5–3% is sufficient. As for cleaning the material inside the pipes, since it involves fuming sulfuric acid and *AO acid, both of which are volatile substances, it is possible to use vacuum pumps or small metering pumps to recover these substances at the lowest point. If an open system is used, the substances can be simply discharged or collected in containers; however, this is not a viable option, as these are volatile acids that can cause significant pollution. Blowing out the pipes is also not advisable