What are the main reasons why the vibration level of the bearing housing in a sealless pump is lower than that in a conventional centrifugal pump?
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SH/T3140 Light-duty centrifugal pumps in the petrochemical industry: sealless centrifugal pumps with a flow rate of ≤4.5 mm/s, and centrifugal pumps with a flow rate of ≤3.0 mm/s
The cantilever length of pumps without seals is small; the cantilever length of ordinary single-stage centrifugal pumps is much larger than that of pumps without seals
This post was last edited by 3983596_FPPZ on 2018-11-1 at 18:53. It seems to be the correct answer – there are few large pumps without seals; their vibration is not significant, and they are also more finely crafted than ordinary centrifugal pumps
The way the original poster framed the question is quite unique; usually, noise and vibration are discussed together, so focusing on vibration alone is a bit confusing. 1. Is it the precision due to fewer exposed parts in the sealless pump, as well as a smaller number of components, which gives it a more refined appearance? But it has little to do with vibration outside. The refinement on the inside lies in the surface finish; the interior of the casting, using the same casting method, should be no different as well. 2. If the cantilever effect can be explained in single-stage pumps, what about multi-stage pumps? Ordinary centrifugal pumps hardly have cantilevers, and multi-stage pumps are not distinguished by standards. So, I’m a bit confused; maybe there are other reasons as well?
This post was last edited by reeuy801 on 2018-11-6 at 13:45. It seems that aspects such as support methods, rigidity, short axis, coaxiality, and suspension still need to be further elaborated upon by fellow users.