So how do i get my NOS gas back?

[starfish prime]

I just want the gas, don't need the liquid. The update forced my nos tank to about 160c. It cooled off and started to make liquid. After a few pipes bursting, I now have a tank to catch the liquid, but I don't have any need for it. Is the only way to keep gas to keep the temperature above 160? This update is really confusing and the graph that they provided doesn't make any sense to me.

[Rodhern]

I am not sure I am helpful, but I will give it a try. If you have some storage of liquid NOS, and say it is about 0 C (think it says above -21C), then you can use an expansion valve to let in some of the liquid to an air pipe with low pressure. If the pressure is below say 500 kPa (think it says around 800kPa; that is where the confusing graph comes in) the liquid that spills in to the air pipe will turn to gas NOS. But of course it may be a bit of a hassle to control how to only move a little bit of NOS at a time, and you cannot really store large amounts of gas NOS (except in tanks, which seems to be sort of immune to the liquid phase shift; they just store the liquid AND gas mixed).

[starfish prime]

The problem is that the gas tanks require gas pipes, which blow up in the presence of liquid. At least a certain amount. This is really confusing. I seem to be stuck in a loope of gas turning to liquid, which turns to gas again. It's just circulating in my backup system.

[Rodhern]

Originally posted by starfish prime:

The problem is that the gas tanks require gas pipes, which blow up in the presence of liquid. At least a certain amount. This is really confusing. I seem to be stuck in a loope of gas turning to liquid, which turns to gas again. It's just circulating in my backup system.

Ahh, yes, right!
So maybe you need to store the NOS in a liquid tank instead to get it to work(?).
(The condensation valve will allow you to move the liquid from the gas pipes to liquid pipes).

[starfish prime]

Now everything in the tank suddenly became -25 and it froze and blew up the pipes. I reloaded and put some pipe heaters on it, but they still blew up. I guess I'll come back to the game after I get my PHD

[starfish prime]

Also the gas mixer is completely useless for nos now. Turning it on for a split second causes massive overpressureization of the pipes. The gas condenses and turns to liquid, the volatiles ignite, which causes the mixed pipe to be completely contaminated, and eventually an explosion

"trying to maintain support for existing worlds and not make the game even more complex for new players than it already is". Yeah, massive fail there.

[Drosta]

What's the autoignition temperature now? I read before today it was 50C. I logged in to having my NOS fuel mix tank removed of hydrogen. Presumably to prevent the explosion because my nitrous is also 160C. At what point did it become liquid for you ? And I'm also confused about the state change mechanics. Obviously it isn't as simple as temp below threshold entire contents state change instantly. It seems to be a trickle. Which is fine. But does that mean some portion of the gas is cold enough to be liquid but not all of it? And how do I tell what the temperature should be in order to manage it? The stationpedia information feels very nearly useless as most of the numbers related to a state change doesn't state a temperature. It just says n/a in a few of the cases I had time to look at. But it's not n/a cuz my stuff is state changing. Lol.

[starfish prime]

I'm starting to figure it out. The gasses that will turn to liquid have been increased in temperature to 160c to keep them from condensating and blowing up the pipes. That is how they are managing the existing games.

Basically, what you have to do is make a secondary system. You need a gas tank with a cooling system. (I'm on Mars, so my system is passive.) You also need a liquid tank with a condensation valve coming off of the gas tank and coolilng system. Also, make a return for the gas (from the liquid tank) back into your cooling system with a purge valve.

The gas will condensate and collect into the liquid tank, and release some gasses, which go back into the gas cooling tank. From there you can put little bits of gas back into your filtration loop. I'm just releasing little bits at a time, because it (NOS) seems to start condensing at a very low pressure (like 500kpa.) I could be wrong about that, it has something to do with pressures and temps, as well.

This probably isn't the ideal solution but it works for now. The problem i currently have is that my nos liquid tank is frozen. So anytime I place a liquid pipe on it, it just bursts.

[Rodhern]

Originally posted by Drosta:

... But does that mean some portion of the gas is cold enough to be liquid but not all of it? And how do I tell what the temperature should be in order to manage it? ...

Hi, I don't know if you got your answers already. I think it is helpful to start out with the simplest cases, then think about the more complex scenarios later. Let us take NOS, as that is the topic of this thread.
At low temperature (less than -21C) it all wants to become liquid or ice*. At high temperature and low pressure (warmer than -21C and less than 800 kPa) it all wants to become gas. This transition of all the matter between liquid and gas can take place in gas pipes and liquid pipes alike (and I don't think it damages the pipes as long as the quantities are small).
Now the two/three things that are likely to cause confusion is:
(A) When the state changes, the temperature will change and (potentially) mess up the result.
(B) The liquid NOS can be more mass than you think, and so when it evaporates, the 800 kPa pressure limit might be reached before you think of it.
(C) How do you keep track of the 'ice amount' in pipes (see below)?
Of course I could be complete wrong in all of this, and in that case, please leave a reply so I can edit, so as to not confuse the next player as much.
*) I do notice that the Stationpedia calling -21C the freezing point; it doesn't seem to create ice to me - except I just ran the experiment with pollution in a liquid pipe and it did burst due to ice - so, I don't know - maybe the ice is marked using the gas icon on the tablet (edit: this was just corrected; now a snow flake shows on the icon).
Edit: The hotfix less than an hour ago (2023-07-21) added a snow flake symbol to the gas when below freezing.
Also it seems that at low temperature the preferred state is cool gas (gas icon with snow flake).

[LittleShade]

It seems efficient to keep the gas tanks at 274K and use the new devices for N2O and Pol gas.

*gas state transition
solid(Min) liquid(Max) gas(Min)
O2 56.4K(-217C)=6.3KPa 163K(-111C)=6MPa 90K(-183C)=100kPa
CO2 218K(-55.3C)=517kPa 265K(-8.1C)=6MPa
N 40K(-233C)=6.3KPa 190K(-83.1C)=6MPa 75K(-198C)=100kPa
N2O 252K(-21C)=800kPa 431K(158C)=2MPa
Vol 81.6K(-192C)=6.3KPa 195K(-78.1C)=6MPa 112K(-162C)=100kPa
Pol 173K(-99.8C)=1.8MPa 425K(152C)=6MPa
H2O 273K(0C)=6.3KPa 643K(370C)=6MPa 373K(100C)=100kPa