I’m a bit confused about PLAN 52B’s flushing procedure

It makes sense that the pressure of the flushing fluid is 0.2 MPA higher than that of the medium, because if hot oil leaks out from the pump, it can cause a fire; the flushing fluid can enter the pump, but the medium cannot leak out. Does the accumulator serve to maintain pressure in case the internal seal fails? Do you think a medium pressure of 0.85 can be maintained?

As the name implies, a reservoir serves to store energy; it contains a bladder that, when the pressure of the fluid inside it drops, helps to maintain that pressure by ensuring it remains higher than the pressure in the pump chamber.

The pressure in the accumulator is higher than that of the medium; in other words, the pressure of the circulating sealing fluid in the external seal is greater than the pressure inside the sealing chamber. When the internal seal fails, the medium in the external seal can only leak inward. If it is detected that the pressure in the accumulator has decreased, it indicates that the internal seal is leaking, and the sealing medium has entered the pump. If the pressure in the accumulator is lower than that of the medium, the internal seal fails, and the medium will leak into the sealing tank. In scheme 21, the fluid is drawn from the pump outlet, cooled, and then introduced into the sealing chamber to reduce the temperature of the internal seal; at the same time, it flushes the area ahead of the internal seal. Of course, the pressure has to be 0.2 higher – otherwise, how can the fluid be injected there?

Our medium pressure is 5 Mpa, the bladder pressure of the accumulator is set at 4.25 Mpa, and the isolation fluid has a pressure of 5.2 MPA. How should the bladder pressure be replenished? Isn’t its pressure already lower than that of the medium? Even if the internal seal leaks, the internal pressure is 5 MPa, while the bladder pressure is only 4.25 MPa. . .

Dude, you didn’t understand what I said. The pressure in the accumulator is 4.25 Mpa, while the pressure of the medium is 5 Mpa. Tell me how to top it up Is this set value intended to allow the medium to leak into the accumulator? For PLAN21, it’s definitely fine for exporting to importing; I didn’t intend to ask about that. .

Options 53A and 53B are similar: in option A, external nitrogen is used to pressurize the isolation fluid, while in option B, an accumulator is used for this purpose. In either case, the pressure should be 0.13–0.17 MPa higher than the pressure of the medium to be sealed. Since the pressure of your medium is 5.0 MPa, the pressure of the isolation fluid should be around 5.13–5.17 MPa. I’m not quite sure about this

Now I understand even less with what you’re saying. The flushing protocol is Protocol 21; is a flushing pressure of 5.2 a pressure that has been reduced? It’s a bit wrong if there’s no pressure reduction; an outlet pressure of 5.2 while the inlet pressure is 5.0 doesn’t seem right at all! Do you confirm the inlet pressure is 5.0? ? ?

I think you might be mistaken; the pressure in the sealing chamber is generally a bit higher than the inlet pressure of the pump, but not by much. The outlet pressure of the pump cannot be used as the pressure in the sealing chamber. Please confirm whether 5 MPa is the inlet pressure of the pump?

I understood it all at once; I had been confusing one thing – the pressure inside the pump is not the pressure at the pump’s outlet! ! ! ! I said it just wouldn’t work no matter what~

I made a mistake myself; I mistook the pump outlet pressure for the pump body pressure! ! - -