Mechanical seal Plan53A – seal tank pressure setting
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How should the pressure in the seal tank for the mechanical seal Plan53A be set? I remember there is a formula used for this; could you please provide the specific formula? ! !
It is sufficient to have a pressure that is 0.2~0.3 MPa higher than that of the sealed chamber.
The pressure of the isolation fluid is 1.4–4.1 bar higher than the pressure in the liner at the throat of the sealing chamber
The pressure in the PLAN53A sealed tank is not specified; generally, it should be 0.2~0.3 MPa higher than the pressure in the sealing chamber. If this pressure is too high, the sealing fluid will enter the primary sealing chamber, while if it is too low, the medium in the primary sealing chamber will flow into the secondary sealing chamber. Some information available for PLAN53B regarding pressure states that: Sealed tank pressure = Pressure in the sealed chamber + (0.14~0.41) MPa.
I have always been skeptical of double-end face mechanical seals, as an external sealing fluid with a pressure of 0.05–0.15 MPA higher than that of the medium is introduced into the sealing chamber
Actually, the people who answered above all have some validity in their points, but it’s not complete. I work in mechanical sealing, having worked for both domestic and foreign companies. Below 2.5 MPa, generally the level of the isolation fluid inside the 53A unit is 0.1~0.2 MPa higher than that in the pump chamber; actually, it’s fine if it’s a bit higher as long as it remains within the design pressure range for sealing purposes. For values greater than 2.5 MPa, it is generally necessary to use 10% of the medium’s pressure; for example, at 5 MPa, 53 A would require a value of 5.5 MPa. The reason why 2.5 MPa is generally expressed as 0.1–0.2 MPa is that such operating conditions represent low-end scenarios in sealing factories abroad; therefore, no detailed calculations are done. Detailed calculations are only carried out for high-end applications. I hope this helps you
The pressure in the sealed chamber can be calculated; one formula is Pm=Ps+0.1X(Pd-Ps)
Formulas do exist, but they are likely empirical formulas, and there will be discrepancies with actual data. For newly installed equipment, the manufacturer can provide the pressure in the sealing chamber; however, for modified equipment, an external pressure gauge is required to measure the pressure in the sealing chamber – otherwise, that pressure value will not be accurate, and the setting for the sealing chamber pressure will also be incorrect.
Could you ask what it means in Chinese?