What even just happened here...

[Quyzbuk]

Just loaded up my save to work on this colony and suddenly my cold (well, cool) spot near the Beetas suddenly has 30+kg of steam in multiple tiles.

[DolphinWing]

Possibly flaking from abyssalite below. Could you check the temperature overlay and see if they are very hot.

[Quyzbuk]

Very strange, suddenly there's a two tile wide section of superheated abyssalite there, can't say I checked beforehand, but what would cause that to happen? I only just started using the area and cleared the uranium and ice on top of it maybe 5-10 cycles prior. Checking a couple cycles before the sudden steam eruption, the abyssalite was 1300C+

[asurendra]

It generated like this. Sometimes worldgen doing strange things. Funny fact is that abissalite does not exchange heat with anything, but it can boil liquids if in contact with them. Dig it and re[lace with regular tiles to prevent further leaks

[DolphinWing]

Or you can just build insulated tiles to cover them.

[cyberwarlord]

19 minutes ago, asurendra said:

It generated like this. Sometimes worldgen doing strange things. Funny fact is that abissalite does not exchange heat with anything, but it can boil liquids if in contact with them. Dig it and re[lace with regular tiles to prevent further leaks

It will exchange heat through anything but another solid. So gases and liquids.

Dump some ice an water on it, it will cool off an be fine.

3 hours ago, Quyzbuk said:

Just loaded up my save to work on this colony and suddenly my cold (well, cool) spot near the Beetas suddenly has 30+kg of steam in multiple tiles.

Yeah, always check the heat overlay near abyssalite. 

[blakemw]

On 1/11/2024 at 7:03 AM, asurendra said:

It generated like this. Sometimes worldgen doing strange things. Funny fact is that abissalite does not exchange heat with anything, but it can boil liquids if in contact with them. Dig it and re[lace with regular tiles to prevent further leaks

That's a significant misconception as Abyssalite has a thermal conductivity of 0.00001, which is sometimes small and sometimes isn't.

Abyssalite does not exchange heat with Abyssalite, Insulation Tiles or Debris (unless the debris is embedded in the Abyssalite, or it's a very small piece of Abyssalite debris exchanging heat with something else). That's because it's is too low to cause temperature to change when the heat exchange rule is "lowest thermal conductivity".

However for cell:cell heat transfer and cell:building (only really applicable to Tempshift Plates and Steam Turbines outside of sandbox) abyssalite can exchange significant amounts of heat, in the case of cell:cell heat transfer it's because the geometric mean of thermal conductivities is used, in the case of cell:building it's because both thermal conductivities and the *thermal mass of the hotter object* are all just multiplied together, since typical Abyssalite cells have an enormous thermal mass of 2,000,000 that multiplier handily compensates for the TC of 0.00001 (this incidentally is a very braindead formula for heat exchange but ONI devs gonna ONI dev).

So as a practical example, say there is very hot abyssalite, call it 1000 C hotter than the thing it's exchanging heat with. Here are some example DTU's:

• To an Igneous Rock Tile: 4.8 kDTU/s (about the same as a Hydrogen Generator)
• To Carbon Dioxide Gas: 10 kDTU/s (about the same as a Coal Generator)
• To Steam: 30 kDTU/s (about the same as a Polymer Press)
• To an Aluminium Tempshift Plate: 2100 kDTU/s (um, about the same as an actively erupting Hot Steam Vent)

(All values measured in game, rather than calculated. Floating point calculation imprecision causes significant deviations when dealing with abyssalite. The above numbers are the heat lost by the Abyssalite rather than gained by the other tile: these two numbers can deviate a little due to floating point imprecision.)

So an exposed hot abyssalite tile can actually be leaking quite a lot of heat even without partial evaporation of liquid, particularly noticeable when it comes to gas. The heat leakage from abyssalite is not that large in absolute terms unless you're using high conductivity tempshift plates. But gas tiles, having low mass, can rapidly rise in temperature due to the heat leakage from abyssalite, a temperature increase which is trivial to see in real time (like changing by 10 degrees or more per second), and easily reaching temperautres high enough to scald dupes.

So don't carelessly leave hot abyssalite exposed. Wall it off with insulated tiles.