Why Nitrogen is Pumped Into The Center Fuel Tank

[@mlehky]

The way the NGS work is actually better described as an oxygen level reduction system, it does not actually generate any Nitrogen. Compressed air from the engine bleed enters the system and the system removes some of the oxygen, that “oxygen enriched air” is dumped overboard. You end up with “nitrogen enrich air” that gets pumped into the tank. The key thing to keep in mind is the system does not actually generate any nitrogen, it really removing a small amount of oxygen. The other thing is the tank is rendered inert not with pure nitrogen but with nitrogen enriched air. Regular air is 21% oxygen, the NGS REMOVES enough oxygen to make the air roughly 15% oxygen (roughly the same as the air you exhale). That relatively small reduction in the oxygen level is enough to get the level low enough that it won’t support combustion.

[@dramjet7]

Well said, same system on 787. Better described as an Oxygen reducing system resulting in higher N2.

[@Lozzie74]

All good except I don’t agree that we exhale 15% oxygen. Our oxygen uptake is minimal. The main function of breathing out is to export CO2. The exhaled air is rich in CO2 but still contains around 20% oxygen

[@md.naimurhasansharon7585]

you guys are extra ordinary... Keep making vedios like that. Its so supportive to aviation students

[@AircraftScience]

Thank you! Will do!

[@d.h1270]

This video rocks! Comprehensive introduction with the associated history event leads we the audience to a thorough understanding of this special system design. Thank you very much for your input in this video, and I’m looking forward to every coming videos!

[@AircraftScience]

Our pleasure!

[@aecelik]

Wow! I've been an aviation enthusiast for so long and I never heard of this system. Very informative

[@Aeronaut1975]

Despite the robot voiceover, this was a very informative video. Thank you for posting.

[@shubhpanchal5487]

Incredible Work...Kudos to Aviation Science! 👍

[@TC-BCN]

Great information and narrative, thank you again for this useful and informative upload!

[@AircraftScience]

My pleasure!

[@LastLoveSong1029]

I found this channel is very useful. Boeing manuals simplified too much that here I can get more information about the system.

[@mkxair]

Excellent presentation on this beautifully engineered system.

[@byloyuripka9624]

algo. your videos are the best thank you for investing the time to make them

[@AircraftScience]

My pleasure!

[@anarabbasov5910]

I love all his videos! please dont stop, and would love to see more videos about 787!

[@satyaranjanbehera1538]

The video is Owesome as always in 3D view. Please make more videos on B777 aircraft.

[@77cats-2]

Came here after watching a video on the crash of the airplane that led to this tank inerting solution. Great animations!

[@andrescastaneda8833]

Thank you for making these videos!!! The content is magnificent

[@worldaviation4k]

Question: I was watching some other channel about an aircraft always pumping in air, making sure more air is pumped out than let out or the other way around. But when they are in cruise surely the air going out and in is the same to maintain that cabin altitude. I wonder if you could help shine a light

[@DareTheMachine]

At higher altitudes the cabin is pressurized (more air pumped in than out) since atmospheric pressure is lower the higher you climb.

[@worldaviation4k]

@@DareTheMachine it would be like a helium balloon, needs air to exit as it climbs. Once it is up there well just make sure it is steady

[@DareTheMachine]

@@worldaviation4k No it’s purely for human survival by preventing hypoxia. Has nothing to do with lift. Check out a video of a pressurization failure incident. Aircraft will keep flying along just fine but the occupants perish.

[@worldaviation4k]

@@DareTheMachine I mean just that it has to let out air so there's no stress on the aircraft, say to around 8000 cabin altitude then keeps it there while it's level

[@mohammedayubayub7931]

Year great do more on engine starting system ❤❤ easy to understand with this graphics.

[@andrescastaneda8833]

Please do one on the Landing Gear, when you get a chance

[@AircraftScience]

Noted!

[@binhnguyen3871]

Great video as always!

[@elrobo3568]

I was a crew chief on USAF fighters and the F-16 has a similar system where Halon is injected into all the fuel tanks when the aircraft is in combat mode This is done in case there is damage to a tank by a bullet etc the void space will not have flammable vapors to ignite. Unfortunately the environmentalists made us take all the Halon tanks because they thought they threatened the ozone layer. This system didn't help much if hit by a missile.

[@AllanBrogdon]

At American Airlines the system on the 737 from Boeing worked great. They bought some after market system on some and they were terrible.

[@nidees23]

Wonderfully explained

[@davidcerven5072]

3:53 Why waste the oxygen ? It can be supplied into the engines and APU to 1. increase thrust and 2. reduce NOx emissions

[@ArmyofSeaturtles]

extra plumbing for negligible amount of performance

[@ShadowedZer0]

Plumbing oxygen through hot areas to engines, sure...

[@shahidbashir6189]

Good technical outstanding information

[@Zorroxyz123]

Excellent.

[@tahirwahdat4135]

Amazing Please make a video series of electrical system of Aircraft thanks n advance

[@larrydockery7201]

great vids on the 777 she is a great airplane i sure miss the l-1011 back in the day she was a dam good airplane

[@TheRealEstate]

Good Video and plausible explanation of #flight800. I may not agree with you on the reason for the explosion. But then again I may be too close to the situation. My mom unfortunately passed away on on that flight, July 17, 1996 at approximately 8:30pm.

[@andrescastaneda8833]

The GE90 series is incredible

[@badiskebsisi6541]

Very nice video Thanks ❤🇩🇿 The only problem is that the components are very small and there’s no accès to work Very difficult

[@feathermerchant]

Who would have thought that running electrical wiring through a heated, aerated fuel tank could possibly have presented a problem? ;-)

[@erbenton07]

How come in all the years before they used nitrogen enrichment there were no fuel tank explosions, center or otherwise?

[@Noman1000]

Could you make a video on how a/c packs work? They are black magic to me.

[@AircraftScience]

Yes, the topic is already on the list of upcoming videos.

[@Noman1000]

@@AircraftScience thanks. I am so new to ac maint and your vids are really helpful for me to wrap my head around what the systems and parts are actually doing!

[@b43xoit]

W'pedia explains them pretty well.

[@craigbrown5359]

The question remains two fold ...why was this system not engineered into aircraft from the getgo and why can't the air-conditioning packs be relocated or properly shielded to dissipate heat...i.e. ceramic tiles like the space shuttle???

[@FlightFixer]

Very informative

[@xpeterson]

Why is the excess oxygen not dumped back into the engines?

[@MeaHeaR]

instedd ov dumping the oxygen overbored, why thay dont be use itt or be store itt insted of having those dangerous oxygen producing canisters that masques drop down fromm ¿¿¿¿

[@ShadowedZer0]

Oxygen enriched air produced isint pure oxygen needed for proper oxygenation to offset hypoxia at higher altitudes. Thats before even considering air processing and associated oxygen safe plumbing required for delivery to passenger service units overhead as that would almist certainly involve a riser running up sidewalls of aircraft that could compromise in an accident too. In layman terms, unsuitable product.

[@bigmakskartoshechkoy6210]

thanks a lot! great!

[@AircraftScience]

You are welcome!

[@peterackson883]

Great

[@andrealeonardi3524]

Grazie

[@Col.J.N.W.SinghKhandala]

This stuff is just fantastic!

[@andrikurniawan6459]

Fuel Allahumma sholli wa sallim wa baarik ala Sayyidina Muhammadin wa'ala ali Sayyidina Muhammadin fil awwalin wal aakhirin wa fil mala'il a'laa ilaa Yaumiddin

[@Boyarsskiy]

Why fuel doesn’t pumped into the central tank from wings? When central tank is empty.

[@ShadowedZer0]

Wing loading and bending force reduction, per xpexplained in video at 0:45

[@RounakKushwaha]

Thanks bro

[@IIGrayfoxII]

Surprised that bleed O2 is not captured for use in an emergency. Even if it is a small amount.

[@dustingermain7037]

Its such a small amount, that the added complexity and energy that it would take to pump it into the engine(s) wouldn't be worth it. I know because I had a similar idea and ask some other engineers at an SAE committee meeting about it.

[@b43xoit]

No doubt similar considerations reveal that pumping it into the cabin would not be worth the cost and would have negligible benefit.

[@MikeSmith-is1yy]

Pretty simple, no O2, no fire.

[@mohammadsalehi8550]

👌🏻👌🏻

[@OdelinSerrano-zu5fo]

He said 83,000 kilogram fuel vapacity for centrr tank. A quick calculation indicates the following: 83,000kg × 2.2 lbs = 182,600 lbs. Divide product by 8.6 lbs [a gallon of milk] the quotient us over 21,000 gallons in the center tank. I'm no engineer, but i don't think that's possible.

[@FayuYang]

looking at my 777 AOM here, the center tank takes 87,887KG of fuel. 1 liter of jet a fuel = 0.85KG = 74703 liter = 19734 gallons. So yes it's possible. Jet fuel is lighter than water by the way. I fly a 787, our center tank takes 71,000kg of gas. That's about 16,000 gallons of jet fuel.

[@Jcanos2011]

N2 is not flammable...

[@praveenshetty2066]

👏👏

[@kayrxx7123]

Why ? Cause TWA 800.

[@Hyperactivman2]

83 To of Fuel 😂

[@himmetramthakur6525]

More same vidio

[@CarlinDontCare]

TWA 800’s center fuel tank explosion is just a theory or let’s just say a cover up.

[@theadmiral5425]

no doubt about it

[@b2instructor166]

Ok. And what is about Phillipine and Thai Airways?

[@dominickmiecik9549]

super fake news air jet engine ned fuel ???????????

[@b43xoit]

Otherwise, what is the source of the Gibbs free energy the engine needs to accelerate air and produce thrust?

[@samuelmatheson9655]

This video is wrong, the Nitrogen is used for NITRO

[@maianbaaii]

🤣🤣🤣🤧🤢💨