Purge Valve bug ?

[Emrys]

If I set 3000 kpa, I still have more than 4000 kpa in the liquid line, for example, since the total pressure only takes the gases into account and does not correspond to the total pressure. Is that normal?

[ulzgoroth]

What are you saying is the difference between the pressure of the gasses and the total pressure? The total pressure is the sum of pressure of gasses.

[Emrys]

no/yes, when you set the purge valve, the total pressure in the liquid line is ignored, only the gas pressure is taken into account. However, since the pressures of gases and liquids in a tube cannot be separated at all, it must be a bug.

[ulzgoroth]

Originally posted by Emrys:

no/yes, when you set the purge valve, the total pressure in the liquid line is ignored, only the gas pressure is taken into account. However, since the pressures of gases and liquids in a tube cannot be separated at all, it must be a bug.

Only gas pressure exists. Liquids don't exert pressure. (They do fill volume.)

I'm not sure I understand what you believe you're seeing. If you want to try to clear it up, maybe go through a gas analyzer screenshot?

[Emrys]

In real pressure have gases and liquids both.(and they fill both volumes).
I don't know if this is also simulatet in Stationeers, but it seems so.
One Purge Valve works korrekt, it's setting comapres to the pressure in the liquid pipe.
There is only gas in there (or near 99%). Another Purge Valve has more liquid in there and the settings not compares to the pressure in the liquid pipe. I's higher.

[Dunkurtin]

Originally posted by Emrys:

In real pressure have gases and liquids both.(and they fill both volumes).
I don't know if this is also simulatet in Stationeers, but it seems so.
One Purge Valve works korrekt, it's setting comapres to the pressure in the liquid pipe.
There is only gas in there (or near 99%). Another Purge Valve has more liquid in there and the settings not compares to the pressure in the liquid pipe. I's higher.

What is the pressure of the pipe the purge valve connects to?
Is this happening still if you pump from the gas pipe you are purging to to keep it at low pressure?

[Emrys]

First Purge Valve (correct pressure)
Gas pipe; 4,54 MPa (N gas 99,9%)
Luiqid pipe: 3 MPa ( is set to 3000)
N gas: 99,2%

Second Purge Valve (incorrect pressure)
Gas pipe: 4,54 MPa (N gas 99,9%)
Liquid pipe: 4,25 MPa (is also set to 3000)
N gas: 47,4% / N liquid: 52,5%

[Emrys]

I have now tested it again differently and think that the Purge Valve works correctly, but is a bit slow in gas exchange. The real problem is that the liquid pipes can withstand far too little pressure (approx. 6 MPa) and the pipes can therefore burst quickly. Liquid tanks with a maximum pressure of 10MPa, for example, can no longer be completely filled because the lines will burst beforehand.
Gas pipes can withstand 10 times the pressure. Did the developers make a mistake by a decimal point?

[Dunkurtin]

Not a mistake but intended. States in the patch notes liquid pipes limit is 6MPa and gas pipes limits is 60MPa. Liquid pipes are not intended for large amounts of gas.

[Emrys]

Unfortunately, this doesn't work very well in practice. For example, in the production of liquid nitrogen, you need pressures of around 5 MPa, or very low temperatures. There's not much room left before the pipes burst. I would therefore increase the maximum pressure of the liquid pipes from 6MPa to 10MPa. That should be enough then.

[Dunkurtin]

Yeah, you're meant to store liquids at stable temperatures. That's the entire point.

[Witgang]

it seems that the purge valve is just a valve so it does not vent any gas if the pressure on the other side is same or higher than pressure inside the liquid pipe.
i was kinda bummed to discover that considering they take 100w each, i mean what's the power consumption for if there is no "pump" in it.. maybe should make them passive as well as the condensation valves and be done with it, that way we can use turbopumps to suck the gas out of liquid lines .
right now having to use 4-5 purge valves and a turbopump is quite power hungry setup