Max liquid pressure per tile

[xialeth]

So, I'm digging (properly) into the Oil Biome for the first time... and am confronted with this: a tile of 18,000kg of oil in a single tile.

Spoiler

I read somewhere that oil likes to have pressure around 800kg per tile, so ... how much of an explosion should I expect?

... I guess I will be saving before digging anywhere near that.

It did lead me to wonder what the max pressure of a liquid in a single tile is--is it the same as the stack size limit?

[Nebbie]

That kind of thing will happily flood the bottom of your base and proceed to get it up to 80 C. Liquid pressure increases at depth so I wouldn't expect exactly 800kg a tile, more an average of 1100kg a tile once it's all spread out if things are fairly vertical.

[ONIfreak]

18000kg - approx 1000kg per tile meaning 18 tiles for 1 tile of oil. Multiply by tiles of oil you have and you will have approx number of tiles ( it might be less than calculation due to pressure). 

Or

Save - dig it - take screenshot - post - come back to save with mental note ( i need half of the map empty to safely open this pandora box)

[xialeth]

I did the math, figured out it was somewhere below 150 tiles worth of oil in there (well, it was somewhere below 150k kg, but at ~1000kg per tile it was close enough), so I almost expected a fountain shooting up... it's not actually looking so bad

Spoiler

I mean, it's still expanding, but I'm disappointed I didn't get my fountain of oil shooting up into my base

 

... Well, on another note, I guess I don't have to pump so much oil now (of course just as I wrote it, it started climbing a lot faster, but it also encountered the horizontal tunnel I dug where I have my entry point, so it's stagnating there for now:

Spoiler

And my poor dupes, valiantly trying to fix the overheat damage xD)

I'm curious to see how far it will climb

[ZanthraSW]

I think you misplaced a zero in your math. It will probably expand to about 5 to 10 times that much volume. 49 tiles times 18 is 882 tiles total as a very rough approximation.

[xialeth]

Oh, it was thankfully only the single tile of 18-19kg (when I counted the tiles, it was at 19.3kg or something); the others were far below that, ranging from 5kg to about 1.3-2kg at the very bottom. Schematic (units are kg, and each tiny square is one tile):

Spoiler

(though in typical mathematician fashion, my basic addition skills are not the best xD, so I wouldn't be surprised if I mis-added somewhere)

[ZanthraSW]

No, your math is probably fine, I just didn't quite understand that it was "only" that one tile overpessurized that much. :). Your diagram is fantastic!

[xialeth]

Just now, ZanthraSW said:

Your diagram is fantastic

It was the height of artistry and finesse

No, this looks much more sensible, I think:

Spoiler

Tiles average a bit above 800kg, so I'm very happy (also found two oil wells to the left and to the right ^^. I had a moment of "get digging, guys!" before I realized I somehow am managing to accrue more coal the more time passes, so switching to a steam turbine isn't actually that needed quite yet)

[beowulf2010]

I love popping open those types of oil pockets. 

I have a natural gas filled geode with around 500kg per tile I'll be opening soon. I think I'll save and pop it open without an airlock to watch, then reload and open it the proper way. 

[ZanthraSW]

As to your main question, I have not seen a hard maximum on the amount of liquid or gas that can be stored in one tile. In order to be able to store very high quantities takes some tricks that are generally considered exploits. Gasses can be stored at very high pressure if the inlet gas vent is sitting in a very small mass of liquid, similarly by using a very small bubble of gas you can prevent a liquid vent from ever over-pressurizing. Liquids at high pressure can break some materials, but if I recall, airflow tiles cannot be broken in that way. 

 

There will of course be a limit to the ammount that can be stored in a tile, but it's probably along the lines of a 32 bit floating point number, around 3x10^38 mcg, or 3x10^29 kg although I think you would hit a soft limit around 3x10^20 or so where the current ammount of liquid in the tile + 10kg rounds off to the current ammount of liquid in the tile, and no longer rises, but don't quote me on that as I am not sure how the values are stored.

[xialeth]

Man, I'm seeing all kinds of things I'm not used to seeing -- now it's 10kg of polluted oxygen in a pocket. Is that a thing that comes with prolonged play time, or is that normal?

[Aelfled]

It happens often when a liquid moves into a gaseous chamber, all the gas ends up squashed into a single tile.

[Lifegrow]

~870kg per tile btw folks, not 800. Higher stacked full tiles will add approximately 10kg to that weight per filled layer above the bottom tile.

[beowulf2010]

1 hour ago, ZanthraSW said:

Liquids at high pressure can break some materials, but if I recall, airflow tiles cannot be broken in that way. 

Both types of solid doors and any amount of gas trapped in place also can hold infinite pressure. 

I mention the gas fact due to a particular type of overpressure liquid storage I use that allows me to empty bottle emptiers into the storage without a pump. 

[ZanthraSW]

1 hour ago, Lifegrow said:

~870kg per tile btw folks, not 800. Higher stacked full tiles will add approximately 10kg to that weight per filled layer above the bottom tile.

Yeah. I think that the increase in mass at the bottom of a column is a neat way of solving the global pressure problem such as filling a U bend from one side and having the liquid rise on the other side to match while only having to compare densities locally. Each tick the density is equalized with adjacent tiles. When the height rises on the filling side, the pressure in the bottom of the bend rises and propagates up the opposite column until the top of that side is above the normal max per tile in which case a new layer of tiles are formed.

[Gunhaver]

22 hours ago, xialeth said:

Man, I'm seeing all kinds of things I'm not used to seeing -- now it's 10kg of polluted oxygen in a pocket. Is that a thing that comes with prolonged play time, or is that normal?

I've seen up to 1,580kg steam in 5 tiles each  7000kg total.. That's a map killer.

[KittenIsAGeek]

On 8/29/2019 at 3:26 PM, xialeth said:

So, I'm digging (properly) into the Oil Biome for the first time... and am confronted with this: a tile of 18,000kg of oil in a single tile.

The oil biome has some interesting properties.  One is that you have pools of oil at high pressure.  Since the oil wants to have a max of around 800kg in a tile, we end up with a roving knot of ultra-high pressure liquid that can do some strange things (like crush tiles).  The only other place that I've really seen this is in the magma zone, though it is a lot less pronounced there.

[DarkMaster13]

Usually when you're going to breach a high pressure pocket like this you want to have a large area already open/cleared in the oil biome that can fit all that overflow.  If you have to open one to get down, try and break into other rooms as well before the oil overflows upwards.  Also be aware that those high pressure pockets can break walls, if they're thin enough.

[SharraShimada]

There was a bug with world gen a short while ago, but they supposedly fixed it.

Either your world was generated prior to the patch (no change applies on existing worlds), or the system is still/again buggy.

[mathmanican]

5 hours ago, DarkMaster13 said:

Usually when you're going to breach a high pressure pocket like this you want to have a large area already open/cleared

These high pressure pockets are perfect for getting oil early game before exosuits. Break one open (all but the last tile) and flee. When the oil breaks that last tile and erupts into a cooler biome, you can often then collect cooler oil without needing exos. Useful if you want to speedrun.

[lunazone]

I'd make a big chasm below it