Crude oil unintentionally evaporated to sour gas

[Kotcha]

So, I just lost a game because my base filled with sour gas. My question is this:

I had a large amount of crude oil near lava. I dug an opening near the bottom and filled it with metal to transfer heat to the oil to produce petroleum. No lava was in direct contact with the oil. The metal's temperature itself never reached 400 degrees. The area surrounding the oil never reached 150 degrees. The oil was heating up slowly but I could never find an oil tile (including the one in direct contact with the hot metal tile) that went above 160 degrees. Yet oil was turning into petroleum and was rising above the crude oil. When the petroleum reached the top, it slowly turned into sour gas. Again, temperature of the area surrounding the petroleum never reached 150 degrees. 

 

Can someone please explain why this happened?

[Neotuck]

you must have missed a tile some where 

check the abyssalite near the lava

[Lurve]

You didn't LOSE a game, you GAINED free sour gas!

[badimo]

26 minutes ago, Kotcha said:

So, I just lost a game because my base filled with sour gas.

Ruining your base and then recovering is half the fun of ONI.  I'm sure you can pull through.  You can do it!

[Kotcha]

I wish. I tried, but now I'm running out of food and dupes are already dying.

[peachkillu]

sounds like an opocalypse imagine purposely building a small base that can house 3 dupes near a cool enough clean water source and starting over just turning the lights out on the rest of the base and letting the remaining few dupes turn to zombie morbs after the huge hit to moral and the depression wears off slowly move back into the what remains of the broken old base doing quick supply runs for what little algea you can find or a few meal lice seeds that had been long forgotten 

Sorry got a little to into that one 

[Neotuck]

@Kotcha

no harm in starting over and learning from mistakes to make better colonies, I do it all the time

Next time pay attention to the abyssalite tiles under the oil biome near lava, some of them start off at 500C and if you dig them up and expose them to crude oil it will boil

[Iriswaters]

Also, the abyssalite can break under the weight of a deep oil lake.  This can potentially dump a ton of crude oil into the magma, and produce a lot of sour gas

[Neotuck]

24 minutes ago, Iriswaters said:

Also, the abyssalite can break under the weight of a deep oil lake.  This can potentially dump a ton of crude oil into the magma, and produce a lot of sour gas

Unlikely, if you dig down to reach the Abyssalite between an oil lake and lava then you've already relieved the pressure in the oil lake when you mined though it

[Iriswaters]

I've had it happen basically every time I've dug down to magma, unless I took careful precautions to prevent it.  It's not unlikely, it happens frequently.

[Neotuck]

I'll take your word for it, I rarely have a reason to dig for lava

[Coolthulhu]

Sounds like the "sweating" mechanic.

Very hot abyssalite can turn adjacent oil into petroleum and then sour gas without visibly heating it first, in 5kg chunks. The energy is all preserved, it's just that phase change happens instantly, without waiting for the whole tile to heat up.

[Oozinator]

Use liquid reservoir and drop a mix out of petrol/water on the ground, fill it with petrol from steelproduction..
Something is wrong with conductivity in some cases..

 

[impyre]

2 hours ago, Coolthulhu said:

Sounds like the "sweating" mechanic.

Very hot abyssalite can turn adjacent oil into petroleum and then sour gas without visibly heating it first, in 5kg chunks. The energy is all preserved, it's just that phase change happens instantly, without waiting for the whole tile to heat up.

This... some of the abyssalite tiles near lava are 1500C, those tiles will turn oil into sour gas, though not for very long. always try to avoid exposing those tiles, they are easy to spot in the thermal overlay since they are a much brighter shade of red.

[Kotcha]

On 12/6/2018 at 8:52 PM, Neotuck said:

@Kotcha

no harm in starting over and learning from mistakes to make better colonies, I do it all the time

Next time pay attention to the abyssalite tiles under the oil biome near lava, some of them start off at 500C and if you dig them up and expose them to crude oil it will boil

Yeah. I already started a new round. Thanks

On 12/6/2018 at 10:08 PM, Iriswaters said:

I've had it happen basically every time I've dug down to magma, unless I took careful precautions to prevent it.  It's not unlikely, it happens frequently.

Really??? Even if the abyssalite is 3 tiles thick?

On 12/6/2018 at 10:16 PM, Coolthulhu said:

Sounds like the "sweating" mechanic.

Very hot abyssalite can turn adjacent oil into petroleum and then sour gas without visibly heating it first, in 5kg chunks. The energy is all preserved, it's just that phase change happens instantly, without waiting for the whole tile to heat up.

So what you're saying is crude oil will turn into sour gas instantly if the adjacent tile is hot enough?

[beowulf2010]

27 minutes ago, Kotcha said:

So what you're saying is crude oil will turn into sour gas instantly if the adjacent tile is hot enough?

Pretty much. Look at the abyssalite in the temperature filter (F3). Some of it will be the darker red of 1,000+ degrees.

If crude oil contacts that directly, it will mostly convert directly to sour gas but there will be some petroleum as well. If you have exosuits and have enclosed your base thermally, this isn't a big deal. If not, don't dig out the tiles that will expose the hot tiles to the crude. 

Funnily, the hot sour gas will boil off polluted water if some of that is floating on the crude oil so it's not all bad as boiling polluted water purifies it. 

[Xuhybrid]

I don't understand how sour gas got all the way from the bottom of the map into your base.

[Neotuck]

31 minutes ago, Xuhybrid said:

I don't understand how sour gas got all the way from the bottom of the map into your base.

that depends on what gases are between them, sour gas is lighter than CO2 or chlorine so it will rise above those

[beowulf2010]

1 hour ago, Xuhybrid said:

I don't understand how sour gas got all the way from the bottom of the map into your base.

The first time I encountered this issue I triggered a lot of the hot spots. And by a lot, I mean that after all the steam recondensed to water and the gasses finished settling out, roughly 3/4 of the gas was sour gas at around 3kg a tile. 

[Neotuck]

1 hour ago, Xuhybrid said:

I don't understand how sour gas got all the way from the bottom of the map into your base.

another thing is the sour gas will be very hot (over 500C) and will boil any liquids on its way up making steam which will also rise 

simply put allowing oil to boil in or near magma without proper airlocks will cause an explosion of heat that will rise quickly though the map

[cpy]

Have you ever not notice when your metal refinery is buttplugged and there is devilishly hot 1600C steam waiting to reign hell upon your base? Yeah me neither

Freshly cooked dupes! Managed to cool it down eventually. Just flooded the damn thing and let the steam rip.

[Ixenzo]

It's the sweating from hot abyssalite. That's how primordial sour gas originates.

Another source of large amounts of sour gas is digging hot abyssalite up. The dropped item will very quickly equalize temperature with surrounding oil, and in many cases that will be enough to turn some of it to gas.