Yogstation-13

Guide to Atmospherics: Difference between revisions

Guide to Atmospherics (view source)

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| bgcolor="red"| <div align='center'>'''Note and disclaimer'''<br>The content of this guide is not supported by the wiki administration, the TG Station server administration or Baystation 12 server administration due to concerns in regard to the guide teaching how to disable nearly all potentially dangerous functions that the atmospherics department offers at round start, which may conflicts with roleplay guidelines. The guide contains some interesting points, which is why it remains here, it is however not to be taken as 'This is what you're supposed to do at atmospherics.'. <br>'''-- Wiki and tgs administrator Errorage (14.1.2012) --'''</div> <!-- Do not change this disclaimer unless the guide is reviewed by wiki admins, bs12 admins or tgs admins and the respective official stances on it change. -->
| bgcolor="red"| <div align='center'>'''Note and disclaimer'''<br>The content of this guide is not supported by the wiki administration, the TG Station server administration or Baystation 12 server administration due to concerns in regard to the guide teaching how to disable nearly all potentially dangerous functions that the atmospherics department offers at round start, which may conflicts with roleplay guidelines. The guide contains some interesting points, which is why it remains here, it is however not to be taken as 'This is what you're supposed to do at atmospherics.'. <br>'''-- Wiki and tgs administrator Errorage (14.1.2012) --'''</div> <!-- Do not change this disclaimer unless the guide is reviewed by wiki admins, bs12 admins or tgs admins and the respective official stances on it change. -->
|}
|}


==Advanced Atmospheric Guide==
==Advanced Atmospheric Guide==
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This is atmos. Hopefully, you are an atmos technician. That picture shows you how atmos starts up, but you don't want it to be like that for too long. Even with the exact pressures changed, it is rather pathetic in it's ability to resist tamper or provide oxygen.
This is atmos. Hopefully, you are an atmos technician. That picture shows you how atmos starts up, but you don't want it to be like that for too long. Even with the exact pressures changed, it is rather pathetic in it's ability to resist tamper or provide oxygen.
And that is exactly what you are doing. However, N2 cannot be cut out of the loop. Due to the vastly higher specific heat ( around 300 as opposed to 20) N2 is incredibly better at stopping fires: in 100 KPA of N2/O2 80/20 and 100 KPA of O2 100, the N2/O2 is effectively 12200 KPA as opposed to 100 KPA in terms of soaking up heat and it doesn't allow the fire to grow in size as quickly, the combination of which can even lead to non-permanent ignition sources being snuffed out by themselves.
And that is exactly what you are doing. However, N2 cannot be cut out of the loop. Due to the vastly higher specific heat ( around 300 as opposed to 20) N2 is incredibly better at stopping fires: in 100 kPa of N2/O2 80/20 and 100 kPa of O2 100, the N2/O2 is effectively 12200 kPa as opposed to 100 kPa in terms of soaking up heat and it doesn't allow the fire to grow in size as quickly, the combination of which can even lead to non-permanent ignition sources being snuffed out by themselves.
Due to the minimum of 16 KPA of O2, and the dangers of skirting that in slight reductions in pressure (17% oxygen? 90KPA due to fire from a while ago? You start dying. 20% can go down to 80KPA, at which point the air alarm is in red anyway) become excessively lethal. 20% is realistic and generally agreed upon.
Due to the minimum of 16 kPa of O2, and the dangers of skirting that in slight reductions in pressure (17% oxygen? 90kPa due to fire from a while ago? You start dying. 20% can go down to 80kPa, at which point the air alarm is in red anyway) become excessively lethal. 20% is realistic and generally agreed upon.


At the top are the two machines can dispense infinite pipes, and your wrench can disconnect and connect pipes. A T-ray Scanner helps you look for damage to the system.
At the top are the two machines can dispense infinite pipes, and your wrench can disconnect and connect pipes. A T-ray Scanner helps you look for damage to the system.
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'''Things to make sure of:'''
'''Things to make sure of:'''
*Use the O2 and N2 computers and set their vents to the maximum pressure (5066.25 KPA).
*Use the O2 and N2 computers and set their vents to the maximum pressure (5066.25 kPa).
*Set all Gas Filter's to maximum pressure, and the 'unfiltered to mix' to max (4500 KPA) pressure.
*Set all Gas Filter's to maximum pressure, and the 'unfiltered to mix' to max (4500 kPa) pressure.
*The waste pumps should all be at 4500 KPA pressure. Important: make sure they stay pumps and pointed in the right direction.
*The waste pumps should all be at 4500 kPa pressure. Important: make sure they stay pumps and pointed in the right direction.
*Basically, anything circled green in the guide set to it's maximum possible pressure.
*Basically, anything circled green in the guide set to it's maximum possible pressure.


==When atmos is set up==
 
==When Atmos is Set Up==
There is a short list of things which fall under your stead:
There is a short list of things which fall under your stead:
*First and by far most important: make sure pipes don't get broken and if they do fix them.
*First and by far most important: make sure pipes don't get broken and if they do fix them.
*Go around swiping your ID on air alarms, setting Plasma and N2O to siphon, and then re-swiping to lock it. You can ask the AI to do this as well, and probably should.
*Go around swiping your ID on air alarms, setting Plasma and N2O to siphon, and then re-swiping to lock it. You can ask the AI to do this as well, and probably should.
*Least importantly, maintain the disposals system. You can generate pipes, but it needs welding and is generally a pain in the ass. You can also make fun slides, though.
*Least importantly, maintain the disposals system. You can generate pipes, but it needs welding and is generally a pain in the ass. You can also make fun slides, though.


==Optimising Internals==
==Optimising Internals==
*On a basic view, a 16 KPA minimum O2 requirement in internals. Pure O2 is theoretically toxic in real life, but has no representation for this in code, and takes a while to be really dangerous anyway (they use it to treat certain diseases, for example), and thus using a mixed tank for internals is fairly inefficient.
*On a basic view, a 16 kPa minimum O2 requirement in internals. Pure O2 is theoretically toxic in real life, but has no representation for this in code, and takes a while to be really dangerous anyway (they use it to treat certain diseases, for example), and thus using a mixed tank for internals is fairly inefficient.
*Emergency O2 tanks have volume 3. Extended Emergency O2 tanks have volume 6. The big air tanks have volume 10. Volume is essentially the 'mole divider' when converting between a canister/air pump to your tank; having a higher volume essentially makes the tank that much more efficient, proportionally, so an EEOT has twice the contained air per KPA in comparison to a regular EOT.
*Emergency O2 tanks have volume 3. Extended Emergency O2 tanks have volume 6. The big air tanks have volume 10. Volume is essentially the 'mole divider' when converting between a canister/air pump to your tank; having a higher volume essentially makes the tank that much more efficient, proportionally, so an EEOT has twice the contained air per kPa in comparison to a regular EOT.
*Cold air has more moles to a KPA, and because people breath in moles, and filling tanks usefully for internals is largely capped by the 1000 KPA release pressure, which means cooling your air before using in internals is important. Cooled down air, such as from a freezer-ed canister, is the most efficient way to set up internals.
*Cold air has more moles to a kPa, and because people breath in moles, and filling tanks usefully for internals is largely capped by the 1000 kPa release pressure, which means cooling your air before using in internals is important. Cooled down air, such as from a freezer-ed canister, is the most efficient way to set up internals. Cooling it below 260 K will result in icicles inside lungs, though.
*If you need to empty an internal tank to make space for better, colder air, you use an air pump set to pump in and turned on then off with the tank inside it, allowing you to refill it more effectively.
*If you need to empty an internal tank to make space for better, colder air, you use an air pump set to pump in and turned on then off with the tank inside it, allowing you to refill it more effectively.


==The Gases, their functions, and some basic Pressure, Temperature, Volume and Heat Capacity notes==
==The Gases, their functions, and some basic Pressure, Temperature, Volume and Heat Capacity notes==
'''N2''': N2 soaks up heat in the air, and lowers the temperature of a fire. By association, it can very quickly lower the temperature of a fiery rupture to the point where the flames self-extinguish. Proof of this can be seen if you go down to the incinerator with a can of burnmix, and a can of 20% burnmix and 80% N2. The N2 contaminated fire will not burn nearly as hot or as well. This is why the Toxins guide recommends opening up a can of N2 to the air, it can and will save your life if there's a rupture.
'''N2''': N2 soaks up heat in the air, and lowers the temperature of a fire. By association, it can very quickly lower the temperature of a fiery rupture to the point where the flames self-extinguish. Proof of this can be seen if you go down to the incinerator with a can of burnmix, and a can of 20% burnmix and 80% N2. The N2 contaminated fire will not burn nearly as hot or as well. This is why the Toxins guide recommends opening up a can of N2 to the air, it can and will save your life if there's a rupture.


Heat Capacity: 300
Heat Capacity: 300


'''O2''': You breathe this. Running out of O2 will cause your slow death by suffocation damage. It is also required for a fire to even start, and hold, ending the fire when the O2 or Plasma is depleted. Having less than 16 kPa of O2 flowing into your lungs chokes you.
'''O2''': You breathe this. Running out of O2 will cause your slow death by suffocation damage. It is also required for a fire to even start, and hold, ending the fire when the O2 or Plasma is depleted. Having less than 16 kPa of O2 flowing into your lungs chokes you.


Heat Capacity: 20
Heat Capacity: 20


'''CO2''': An invisible, heavy gas, CO2 is one of the first and fastest gases the scrubbers suck out of the air. It chokes people effectively and quickly, and if you can be bothered to set the alarms up, will result in a invisible room that kills those in it. Takes some setup and can be very, very annoying. The emote for this at low levels is (gasps alone? chokes and gasps?)
'''CO2''': An invisible, heavy gas, CO2 is one of the first and fastest gases the scrubbers suck out of the air. It chokes people effectively and quickly, and if you can be bothered to set the alarms up, will result in a invisible room that kills those in it. Takes some setup and can be very, very annoying. The emote for this at low levels is (gasps alone? chokes and gasps?)


Heat Capacity: 30
Heat Capacity: 30


'''N2O''': A white-flecked gas. Makes you laugh at low doses and at higher ones puts you to sleep. Scrubbers don't deal with it too well and portable scrubbers just choke on it. If using this as a sleep gas mix do *not* forget the O2 at at least 16 kPa, or you will kill someone.
'''N2O''': A white-flecked gas. Makes you laugh at low doses and at higher ones puts you to sleep. Scrubbers don't deal with it too well and portable scrubbers just choke on it. If using this as a sleep gas mix do *not* forget the O2 at at least 16 kPa, or you will kill someone.


Heat Capacity:
Heat Capacity:


'''Plasma''': The one truly flammable gas on the station, plasma is purple, and highly toxic. Of note is the fact that in the presence of any oxygen at high pressures, Plasma pumped into air, and Burn Mix (O2 and Plasma), can and will spontaneously ignite on turf at high pressures.
'''Plasma''': The one truly flammable gas on the station, plasma is purple, and highly toxic. Of note is the fact that in the presence of any oxygen at high pressures, Plasma pumped into air, and Burn Mix (O2 and Plasma), can and will spontaneously ignite on turf at high pressures.


Heat Capacity:
Heat Capacity:


'''Plasma Type B''': While not on Station, Plasma B is premixed burnmix. It can still be adminspawned in a pipetank, as it still exists in code. This is more here as a note of interest.
'''Plasma Type B''': While not on Station, Plasma B is premixed burnmix. It can still be adminspawned in a pipetank, as it still exists in code. This is more here as a note of interest.


Heat Capacity:
Heat Capacity:


'''PV=nRT''' where R = 8  The following are linked by this equation. Sadly, without either Volume or Moles, it's not useful in game and is here for the theory.
'''PV=nRT''' where R = 8  The following are linked by this equation. Sadly, without either Volume or Moles, it's not useful in game and is here for the theory.


'''Pressure (P)''': Measured in kPa, kiloPascals, Pressure is lethal above 750 KPA's. A pressure in a room above 1000 KPA's necessitates internals to breathe properly. <!-- We don't have a pressure cap on breathing air in general, just minimum O2. ~Scottzar -->


'''Temperature(T)''': Measures in K, Kelvin, Temperature above x and below y causes burn damage. Bomb making usually relies on a temperature at or in excess of 90 kK. Floors and walls melt at a temperature of z.
'''Pressure (P)''': Measured in kPa, kiloPascals, Pressure is lethal above 750 kPa's. A pressure in a room above 1000 kPa's necessitates internals to breathe properly. <!-- We don't have a pressure cap on breathing air in general, just minimum O2. ~Scottzar -->
 
 
'''Temperature (T)''': Measures in K, Kelvin, Temperature above 360 K and below 260 K causes burn damage. Bomb making usually relies on a temperature at or in excess of 90 kK. Floors and walls melt at a temperature of z.
 
 
'''Moles (n)''': While not a variable that can be seen, Moles are the amount of particles of a gas in the air. It is moles that cause odd effects with a certain chemical. As it dumps so many moles to a turf, to keep the pressure acceptable, the moles have to be very, very cold, causing the infectious effect.
 


'''Moles(n)''': While not a variable that can be seen, Moles are the amount of particles of a gas in the air. It is moles that cause odd effects with a certain chemical. As it dumps so many moles to a turf, to keep the pressure acceptable, the moles have to be very, very cold, causing the infectious effect.
'''Volume (V)''': Another unseen variable, Volume is the size of a turf, or a canister, tank or piped tank. This helps dictate how much gas it can hold. (Potential list of volume for a tile, pipe, airtanks, etanks, canisters, ect?)


'''Volume(V)''': Another unseen variable, Volume is the size of a turf, or a canister, tank or piped tank. This helps dictate how much gas it can hold. (Potential list of volume for a tile, pipe, airtanks, etanks, canisters, ect?)


'''Heat Capacity''': A gasmix has heat capacity, and it is calculated by taking into account the quantity of all of the gases in the air and their specific heat. Oxygen has a specific heat of around 20, CO2 has 30, and N2 has 300. When you factor in the normal 70% N2 it leaves you with a very high specific heat. The higher the specific heat, the more energy required to heat up the mixture, meaning that with an air mix vs. pure O2 mix, it takes much more energy to heat the air than the O2, and the increase in energy required also decreases how much the fire spreads. Simply slowing it down means that heat energy will be 'soaked up' by the air instead of super-heating everything extremely quickly.  
'''Heat Capacity''': A gasmix has heat capacity, and it is calculated by taking into account the quantity of all of the gases in the air and their specific heat. Oxygen has a specific heat of around 20, CO2 has 30, and N2 has 300. When you factor in the normal 70% N2 it leaves you with a very high specific heat. The higher the specific heat, the more energy required to heat up the mixture, meaning that with an air mix vs. pure O2 mix, it takes much more energy to heat the air than the O2, and the increase in energy required also decreases how much the fire spreads. Simply slowing it down means that heat energy will be 'soaked up' by the air instead of super-heating everything extremely quickly.  


'''Fire''': An effect caused by burning plasma, fire comes in two different forms of hotspot. It causes massive burn damage, and a strong fire will not be stopped by standard firesuits. Plumbing N2 into a room might work, but heavy firefighting is not the point of this section. Fire will ignite any form of combustibles in near tiles. Sufficiently hot fires use less oxygen as they rise in temperature. This is due to the fact that fires remove X plasma and X*(1.4-Y, Y< or = 1) oxygen. X CO2 is produced. Ideal Burnmix is: higher O2 than plasma for really cold ones, such as open air small plasma usage, with a consistent decrease based off of temperature until you reach 28.57% O2. In general, 30% O2 is a good mark for N2 less fires.
'''Fire''': An effect caused by burning plasma, fire comes in two different forms of hotspot. It causes massive burn damage, and a strong fire will not be stopped by standard firesuits. Plumbing N2 into a room might work, but heavy firefighting is not the point of this section. Fire will ignite any form of combustibles in near tiles. Sufficiently hot fires use less oxygen as they rise in temperature. This is due to the fact that fires remove X plasma and X*(1.4-Y, Y< or = 1) oxygen. X CO2 is produced. Ideal Burnmix is: higher O2 than plasma for really cold ones, such as open air small plasma usage, with a consistent decrease based off of temperature until you reach 28.57% O2. In general, 30% O2 is a good mark for N2 less fires.


<!-- Not too much more to say, but you're welcome to codebrowse for the variables I've indicated with x, y and similar. Hawk. -->
<!-- Not too much more to say, but you're welcome to codebrowse for the variables I've indicated with x, y and similar. Hawk. -->


==Using an air alarm==
==Using an Air Alarm==
Air alarms are the central tool of an atmos tech outside setting atmospherics up. To use an air alarm, simply swipe your ID across it.
Air alarms are the central tool of an atmos tech outside setting atmospherics up. To use an air alarm, simply swipe your ID across it.


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'''Vents''': you control vents through the air alarm. There are the following settings:
'''Vents''': you control vents through the air alarm. There are the following settings:
*External on, Internal off: will drain/add air from the tile the vent is on to make it the correct amount. All air being moved goes into/comes out of the pipe the vent is attached to. Set to 0 to drain air, or pressurise to specific levels.
*'''External on''', Internal off: will drain/add air from the tile the vent is on to make it the correct amount. All air being moved goes into/comes out of the pipe the vent is attached to. Set to 0 to drain air, or pressurise to specific levels.
*Both on: completely useless. Don't bother.
*'''Both on''': completely useless. Don't bother.
*External off, Internal on: Drains/adds air to the tile to get the pipe attached to the correct level. Setting a vent to internal and the desired pressure to 0 causes ALL gas which enters the pipe to be shunted out onto the tile.
*External off, '''Internal on''': Drains/adds air to the tile to get the pipe attached to the correct level. Setting a vent to internal and the desired pressure to 0 causes ALL gas which enters the pipe to be shunted out onto the tile.
 


'''Scrubbers''': two settings, scrubbing and syphoning.
'''Scrubbers''': two settings, scrubbing and syphoning.
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*Syphons will do the same, except indiscriminately and drain all gasses on their tile.
*Syphons will do the same, except indiscriminately and drain all gasses on their tile.


==Being a traitorous scum==
 
==Being a Traitorous Scum==
If you are just trying to flood a gas like plasma, you can essentially do the basic set up with plasma instead of a N2/O2 mix.
If you are just trying to flood a gas like plasma, you can essentially do the basic set up with plasma instead of a N2/O2 mix.
*You can C4 the digital valves to let you remove them and shut down AI control, or save a C4 and disable the cameras if you know there's no Cyborgs on the station.
*You can C4 the digital valves to let you remove them and shut down AI control, or save a C4 and disable the cameras if you know there's no Cyborgs on the station.
*Using a gas filter turned on to pour large, ever increasing, amounts of gas onto a single connector port has no visible effects, but if you wrench a canister onto it then the canister will almost immediate fill up with the massive pressure buildup, letting you get super-high pressure plasma/CO2/etc canisters to hit area's with.
*Using a gas filter turned on to pour large, ever increasing, amounts of gas onto a single connector port has no visible effects, but if you wrench a canister onto it then the canister will almost immediate fill up with the massive pressure buildup, letting you get super-high pressure plasma/CO2/etc canisters to hit area's with.


==Useful Atmos Trvia==
 
==Useful Atmos Trivia==
*Using H/E pipes in space you can cool things down to a very low temperature very quickly. By making a cross with two off them you can have two on one tile, which is known as 'sequesteral' cooling.
*Using H/E pipes in space you can cool things down to a very low temperature very quickly. By making a cross with two off them you can have two on one tile, which is known as 'sequesteral' cooling.
*Air Filters on currently burning mixes can siphon out heated but PURE O2 and Plasma. Do the O2 first then the plasma, as there is less O2 in a fire and thus it functions faster. This (and H/E) allow you to reach really obscene temperatures.
*Air Filters on currently burning mixes can siphon out heated but PURE O2 and Plasma. Do the O2 first then the plasma, as there is less O2 in a fire and thus it functions faster. This (and H/E) allow you to reach really obscene temperatures.
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*The gas diverted by an air filter has no maximum pressure, and can therefore reach an insane amount. For example, you can filter out the oxygen into one sealed pipe and it will keep rising.
*The gas diverted by an air filter has no maximum pressure, and can therefore reach an insane amount. For example, you can filter out the oxygen into one sealed pipe and it will keep rising.
*You can hack an air alarm to use it as a non-atmostech.
*You can hack an air alarm to use it as a non-atmostech.
*Any time chemistry sets off an air-affecting grenade (Think Welderfuel/Ground Plasma), the particles spread themselves as part of an airmix. This is bloody annoying, because though the Air Alarms pick them up as "High Concentration of Unknown Particles Detected", they are impossible to suck down to Atmos. Spacing the entire affected air is, as far as I know, the only real "cure". There is a viable way to clean this, if you can safely cordon off the area. Detonating a welding fuel tank usually (always?) cuts a hole to space on the tile beneath it, and thus if you set your internals on and wear a fire suit, is an highly unsafe but effective way of draining the air. It is also one of the few ways to destroy pipes which are at a high pressure and thus can be a useful emergency cut-off if there is plasma irrevocably linked to distribution. It does KO you, do damage, and can make a space tile, which means without internals and a fire suit it can kill you. Caution is advised.
*Any time chemistry sets off an air-affecting grenade (think Welderfuel/Ground Plasma), the particles spread themselves as part of an airmix. This is bloody annoying, because though the Air Alarms pick them up as "High Concentration of Unknown Particles Detected", they are impossible to suck down to Atmos. Spacing the entire affected air is, as far as I know, the only real "cure". There is a viable way to clean this, if you can safely cordon off the area. Detonating a welding fuel tank usually (always?) cuts a hole to space on the tile beneath it, and thus if you set your internals on and wear a fire suit, is an highly unsafe but effective way of draining the air. It is also one of the few ways to destroy pipes which are at a high pressure and thus can be a useful emergency cut-off if there is plasma irrevocably linked to distribution. It does KO you, do damage, and can make a space tile, which means without internals and a fire suit it can kill you. Caution is advised.
*Pipes at around 300 kPa pressure can be unwrenched, however, devices such as pumps and filters don't really 'hold' pressure and can be unwrenched at any time! (Assuming they're off.)
*Pipes at around 300 kPa pressure can be unwrenched, however, devices such as pumps and filters don't really 'hold' pressure and can be unwrenched at any time! (Assuming they're off.)
*Gas pumps are for precise pressure control, volumetric pumps are for really fast pumping, and passive gates are for having 'one way' manual valves.
*Gas pumps are for precise pressure control, volumetric pumps are for really fast pumping, and passive gates are for having 'one way' manual valves.




==Fun projects==
==Fun Projects==
*The Atmospherics system is far from optimal, and I'm talking about just the pipe configuration! Break out that wrench and start experimenting! (Just make sure you know what's what.)
*The Atmospherics system is far from optimal, and I'm talking about just the pipe configuration! Break out that wrench and start experimenting! (Just make sure you know what's what.)
*Extremely high temperature gasses (Like those from a panic siphoned fire.) can really clog the waste loop. Can something be done to correct that?
*Extremely high temperature gasses (Like those from a panic siphoned fire.) can really clog the waste loop. Can something be done to correct that?
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*The mining station doesn't have air recycling. Very long rounds might make this a problem for any miners working there.
*The mining station doesn't have air recycling. Very long rounds might make this a problem for any miners working there.


==The less well know hazards of gasses==
 
*Any gas at pressure over 1000 KPA will cause you to start suffocating as in a vacuum. You can just use internals, though.
==The Less Well Know Hazards of Gasses==
*Any gas at pressure over 1000 kPa will cause you to start suffocating as in a vacuum. You can just use internals, though.
*N2O is invisible at low pressures. If you start giggling, put on your internals to avoid passing out.
*N2O is invisible at low pressures. If you start giggling, put on your internals to avoid passing out.
*Any gas can displace O2, and less than ''16'' (also useful for optimizing internals) KPA of oxygen starts the Oxyloss. CO2 can be removed with the scrubbers, but to get rid of N2 simply apply some way of removing gas from the air and adding O2. My personal favorite is 2 air pumps, 3 connectors and a Air Filter and a canister: 1 pump draws in, goes through the connection and filters N2 into the canister, and the rest to the other pump, which expels it. Can also be used for N2O which is only sluggishly scrubbed otherwise.
*Any gas can displace O2, and less than ''16'' (also useful for optimizing internals) kPa of oxygen starts the Oxyloss. CO2 can be removed with the scrubbers, but to get rid of N2 simply apply some way of removing gas from the air and adding O2. My personal favorite is 2 air pumps, 3 connectors and a Air Filter and a canister: 1 pump draws in, goes through the connection and filters N2 into the canister, and the rest to the other pump, which expels it. Can also be used for N2O which is only sluggishly scrubbed otherwise.
*Pressure's above 750KPA do 10DPS + 5DPS for every extra 375KPA above that mark,  rounded off. Space suits completely block it all, but there is no other defence.
*Pressure's above 750kPa do 10DPS + 5DPS for every extra 375kPa above that mark,  rounded off. Space suits completely block it all, but there is no other defence.
 
 
[[Category:Guides]]
[[Category:Guides]]
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