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[Lemunde]

Works like a weapon trap except it hits the target with flames instead of weapons when they pass over it.  Construction would require a single mechanism and maybe a pipe section and it would need fuel such as coke or charcoal and perhaps rendered fat to operate.  Damage potential should be relatively high since it requires more maintenance and valuable fuel.

[LordSlowpoke]

Works like a weapon trap except it hits the target with flames instead of weapons when they pass over it.  Construction would require a single mechanism and maybe a pipe section and it would need fuel such as coke or charcoal and perhaps rendered fat to operate.  Damage potential should be relatively high since it requires more maintenance and valuable fuel.

It's here. We call it the "magma drowning chamber"

[Safe-Keeper]

It's a very cool idea (I've been thinking of flame throwers as siege engines, myself), but firstly, I personally think that it should have a higher priority to make traps and mechanics realistic (ie. not being able to simply slap down a magical invisible cage in the middle of a hallway and wait for a goblin to stumble into it), and secondly, burning creatures are a grave threat both to your fortress and FPS.

Dwarf Fortress being what it is, I picture this scene:

Winnie the Grizzly Bear comes lumbering by to raid your booze stockpile and on his way in gets torched by the flame trap. Unabated, he continues on, filling your hallway with smoke and setting fire to the chained guard dog and a warrior who runs away to the meeting hall, setting fire to the other dwarves, who were throwing a party there. The bear then reaches the booze stockpile and ignites the nearest barrel, causing an explosion that wipes out your entire food and booze supply and fills the entire fortress with smoke. Then, tantrum spirals. Then, survivors killed by goblin raid.

[Squirrelloid]

It's a very cool idea (I've been thinking of flame throwers as siege engines, myself), but firstly, I personally think that it should have a higher priority to make traps and mechanics realistic (ie. not being able to simply slap down a magical invisible cage in the middle of a hallway and wait for a goblin to stumble into it), and secondly, burning creatures are a grave threat both to your fortress and FPS.

Dwarf Fortress being what it is, I picture this scene:

Winnie the Grizzly Bear comes lumbering by to raid your booze stockpile and on his way in gets torched by the flame trap. Unabated, he continues on, filling your hallway with smoke and setting fire to the chained guard dog and a warrior who runs away to the meeting hall, setting fire to the other dwarves, who were throwing a party there. The bear then reaches the booze stockpile and ignites the nearest barrel, causing an explosion that wipes out your entire food and booze supply and fills the entire fortress with smoke. Then, tantrum spirals. Then, survivors killed by goblin raid.

How is that not an argument in favor of fire traps?

[Quietust]

The bear then reaches the booze stockpile and ignites the nearest barrel, causing an explosion that wipes out your entire food and booze supply and fills the entire fortress with smoke.

Repeat after me: "Booze does not explode".

It could burn (once it reaches 832°F/444°C), but all you're likely to see is it boiling away (at 182°F/83°C) in a harmless red cloud.

[Squirrelloid]

The bear then reaches the booze stockpile and ignites the nearest barrel, causing an explosion that wipes out your entire food and booze supply and fills the entire fortress with smoke.

Repeat after me: "Booze does not explode".

It could burn (once it reaches 832°F/444°C), but all you're likely to see is it boiling away (at 182°F/83°C) in a harmless red cloud.

The lack of explosive booze is one of the biggest disappointments in the game.

Booze sealed in barrel = alcohol vaper pressure = explosive.

[Umi]

We need that chemical compound the Romans had that caught on fire when it touched water.  We don't even know how they did it to this day.

Imagine getting caught on fire and jumping in a lake to put it out.  Only to have it nearly explode with the abundant fuel.  >

[Funk]

as a way of keeping the trap from geting over powerd
a range of fuel's
i.e.
water even if you add salt it is not too hot
but quicklime can be add to water to heat it.
fat and oil is hotter but need to be kept hot
acids/venom need no heat but based of power of the venom or acid.

all liquid traps need power to work there pumps,
some need to be keept hot to work(at room temp oil is a joke)

edit:quicklime is the most likey one.

[Neonivek]

We need that chemical compound the Romans had that caught on fire when it touched water.  We don't even know how they did it to this day.

Imagine getting caught on fire and jumping in a lake to put it out.  Only to have it nearly explode with the abundant fuel.  >

It is called Sodium

[Lord Shonus]

We need that chemical compound the Romans had that caught on fire when it touched water.  We don't even know how they did it to this day.

Imagine getting caught on fire and jumping in a lake to put it out.  Only to have it nearly explode with the abundant fuel.  >

It is called Sodium

What he's referring to is "Greek Fire" the formula for which has been lost for centuries. There are a number of compounds that do the same thing, but we have no idea which, if any, of those known was used. It did not, however burn water. Water merely served to ignite it. (Sand and urine were the only recorded extinguishing agents.)

[Fetus4188]

Compounds have been concocted the display all the known properties of Greek fire using only materials they would have had available. It's not so much unknown as it is "unsure which one they actually used."

[immibis]

We need that chemical compound the Romans had that caught on fire when it touched water.  We don't even know how they did it to this day.

Imagine getting caught on fire and jumping in a lake to put it out.  Only to have it nearly explode with the abundant fuel.  >

It is called Sodium

Actually it's Cesium.

[Pilsu]

Heated sand is a devastating weapon. Goggles Armor does nothing to protect you since the sand pours in from the tiny holes and seams. Mind you, this isn't something you launch, you pour it on them. Don't get any ideas involving catapults, it won't work.

[Mangled]

We need that chemical compound the Romans had that caught on fire when it touched water.  We don't even know how they did it to this day.

Imagine getting caught on fire and jumping in a lake to put it out.  Only to have it nearly explode with the abundant fuel.  >

It is called Sodium

Actually it's Cesium.

Most of the metals that end in 'ium' work for that.
Sodium and Calcium are some of the more explodey however.

[Shades]

Most of the metals that end in 'ium' work for that.
Sodium and Calcium are some of the more explodey however.

Calcium is not explodey, you meant Cesium which is. Sodium isn't either but does react with water.

Potassium is more reactive than Sodium but less so than others, Francium is fairly bad and will react with water in the air too.

Basically all the Alkali metals react to some extent with water.