Minor issues with double-flange level gauges
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As shown in the figure, is there anyone who can explain this?
Who told you that P-=P? What you wrote later is correct
P inside the tank does not need to be calculated
The pressure of the capillary silicone oil should be increased
I see it written like this in this PPT
p+ = P+ρgH, P- = P+ρ₁gh. What’s the problem with that? . . . . ?
The PPT states that it comes without an isolation fluid, while you say it has one
p_=p probably does not take the capillary pressure into account.
It’s not specified that everything in the PPT has to be true either. There’s something wrong with the PPT you’ve downloaded; since you’ve indicated the density at the pressure transfer tube, it’s assumed that there is a sealing fluid inside, so pressure definitely needs to be taken into account, right? If it’s empty, what’s the point of marking the density? Besides, the actual condition can’t possibly be empty; over time, condensate and similar substances will form, and it’s not possible to drain them regularly. These are pressure vessels after all, under pressure.