What flushing method should be used for the mechanical seal of the pump shaft that transports acrylic acid? Frontal flushing must be available.
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Acrylic polymerizes easily, which is why PLAN11+PLAN52 were chosen for the flushing scheme. The issue now is that for plan 52, an end-to-end seal with a pumping ring is desired; however, considering that the medium inside the pump chamber could seep into the interior of the pumping ring, this could lead to the springs getting stuck. So I’m wondering if there are any other types of seals that could be used? May I ask if back-to-back type mechanical seals can be used in combination with PLAN11? Are there back-to-back mechanical seals with a pumping ring structure? The original bellows-type mechanical seal was not chosen because, due to the tendency of the medium to polymerize, crystals would form in the gaps of the bellows.
This post was last edited by foam_ZPTK on 2018-6-20 at 15:34. It can be changed to a back-to-back design; PLAN53A should be used for flushing. It is preferable to use bellows, as well as graphite gaskets or imported perfluoroether compounds. A thermal insulation jacket is also recommended.
Thank you, but the process requirements specify that no other liquids should mix with the acrylic acid in order to maintain the purity of the material. Therefore, the pressure in the pump chamber must be higher than that in the sealing chamber. Can the 53 model still be used under these conditions?
Under normal conditions, the leakage rate per sealing surface is less than 5.6 g/h. There isn’t much isolation fluid left in one of the storage tanks either. If they simply won’t let you in, then think of another way.
Mechanical seals that use wave springs as compensation elements have a much lower resistance to clogging; springs are far superior in this regard
The series-mounted seal uses plan52+11 – there’s always one that suits you:lol:lol
This medium is quite hazardous; could we consider using a shielded pump or a magnetic drive pump?
The pump has this structure; can PLAN11 be used? If PLAN11 is used, how does the liquid return to the pump? According to the materials I read before, in PLAN11, after the front surface has been washed, the liquid returns to the pump through the gap between the throttle bushing and the shaft; however, it seems that there is no throttle bushing in this diagram.
The seal is not visible; it seems that the gap between the shaft sleeve and the pump cover is not large
Then it probably can’t use Plan 11