Selection of pumps for solid-containing acidic liquid streams
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Pump selection for processes such as slurry with a solid content of 30% (Wt), pH=3, cyclic cooling, and pressure filtration transportation? We have tried various pumps, but none of them yielded satisfactory results; the mortar pump with K-type seals, the negative-pressure pump equipped with an auxiliary impeller, and the centrifugal pump IHF with double-end cemented carbide linings – in each case, problems arose with the shaft seals after some time of use ； Are there any better pumps?
Reply to 1# shanzhongwulao: May I ask the original poster, what is the viscosity of the medium? Does it contain solids, in the form of particles, or is it a paste?
Reply to 2# FLYTOINTER: Particle size is 5um, not viscous
Reply 1# shanzhongwulao: Seals often fail because solid particles enter the sealing surface and wear it down. For media containing solids, flushing is necessary when using mechanical seals. API 682 provides two flushing schemes suitable for such media: PLAN31 and PLAN32. PLAN31 involves internal flushing, where the fluid exits the pump and passes through a cyclone separator to have the solid particles removed before the liquid enters the seal chamber to flush the seal surface. PLAN32 uses clean external fluid (one that is compatible with the medium) to directly flush the seal surface. I haven’t used PLAN31 before, but I use PLAN32 frequently; I think it should be suitable for your situation.
Reply to 4# FLYTOINTER: I haven’t worked with pumps that come equipped with a flushing function. I was wondering if there are any requirements regarding the amount of flushing fluid and the flushing pressure
Reply to 5# shanzhongwulao: There are definitely requirements; as for the exact amount, it’s best to ask a sealing manufacturer to help with the calculations, as they are experts in this field
It is recommended that you use positive displacement pumps, rather than limiting yourself to centrifugal pumps. It can be used as a reference for pneumatic diaphragm pumps, hose pumps, and flexible impeller pumps. It is recommended that you send the detailed information.
Original poster, since the substance contains particles and is corrosive, as well as needing to be transported via filtration, you should opt for a pneumatic diaphragm pump. Pumps like centrifugal pumps are no longer suitable in this case. I recommend using WILDEN pneumatic diaphragm pumps – they are made of plastic, imported originally, and ensure reliable performance
Our diaphragm pumps are widely used for pressure filtration transfer, and are suitable for media with high solid content, high viscosity, and corrosive properties