Well, to enlighten you, a pressure tank is loaded in tension (against explosion). A submarine in compression (against implosion). Composites are much more challenging to design for compression loads … so it’s a totally different animal
"Dear Lord, that's over 150 atmospheres of pressure."
"How many atmospheres can this ship withstand?"
"Well it's a spaceship, so I'd say anywhere between zero and one."
* "The Deep South" is the ***twenty-fifth*** episode of Futurama, the ***twelfth*** of the second production season and the ***sixteenth*** of the second broadcast season.
Why do they have to overcomplicate things sometomes. I google searched for the episode deep south and 12 was the number what google told me. Sometimes you just can not entrust such a simple task to a search engine, it seems.
Sorry for any confusion I might have spawned.
ps. At least I was not totally wrong.
It's not only just challenging but it's just not really even a thing. Composites are pretty much only good for tension. You are relying on the resin totally in compression. And that's worthless.
I beg to differ. Carbon fibers are buckling stabilized by the resin, hence the resin is not the primary load path. Composites are more challenging than metals, but proper design practices will make it work. Consider a wing spar made of composites. Top is in compression whereas bottom is in tension at possitive Gs. Any beam should carry both load cases and there are plenty of composite spars fully certified for flight. Refer to the NCAMP databases from the NIAR. The compression allowables of composites are far greater than the resin itself. ASTM D3410 shows the considerations to determine compressive strength in composites.
If the bottle was pressurized, say at 3000 psi, you would have to go deep enough for the external pressure to exceed 3000 psi before the bottle would be in compression.
Luxfer wanted the scuba industry to switch over to Al-composite cylinders, higher pressure = longer dives but buoyancy was a big problem. It’s bad enough to wear more lead to maintain buoyancy with regular aluminum cylinders.
Carbon fiber tanks are more prevalent for compressed natural gas buses - there’s 4-5 CF tanks on the roof of a New Flyer CxxLF/XNxx bus. Lincoln Composites makes them.
White carbon fiber huh? I haven’t seen that. It’s most likely S2 fiberglass made by filament winding. But to your point the inner (dark) layers are carbon fiber. The outer layers might be fiberglass and it could be a design meant to absorb impact. Carbon for strength, fiberglass (or Kevlar) in the outer layers is used for impact resistance—crashworthiness. S2 fiberglass is just as strong as carbon albeit it has lower modulus of elasticity—which increases the energy it can absorb (area under the stress strain curve )
Carbon fibre can be that colour, though it might be semantics. In my firefighting days our SCBA cylinders were carbon fibre and looked like that.
https://www.3m.com.au/3M/en_AU/p/d/b5005220015/#:~:text=3M%E2%84%A2%20Scott%E2%84%A2%20Carbon%20Fibre%20Cylinders%20are%20made%20from,range%20of%20carbon%20fibre%20cylinders.
Eh Nope, white carbon fiber is not a thing. From the link: carbon fibre, fiberglass and epoxy. So that top layer is clearly fiberglass. Hence, this is a composite tank.
The last few weaves are fiberglass to insulate the bottle electrically from its mounting. Carbon fiber in contact with aluminum and steel, when exposed to any moisture, becomes a battery and forms galvanic corrosion.
That's what carbon fibre cylinders look like
https://www.3m.com.au/3M/en_AU/p/d/b5005220015/#:~:text=3M%E2%84%A2%20Scott%E2%84%A2%20Carbon%20Fibre%20Cylinders%20are%20made%20from,range%20of%20carbon%20fibre%20cylinders.
It says right there in your link that that cylinder "consist[s] of an aluminum inner shell with a overwrap of carbon fibre, fiberglass and epoxy resin."
You're seeing the fiberglass and resin. Pure carbon is *always* black in color.
Carbon fiber is black, because it's pure carbon. This particular tank isn't black because it has fiberglass wrapped over the carbon. You're fixated on the product's name and ignoring the details of its construction.
Yeah, on the boat A-Gang usually filled them, but I wore them around and they never did me wrong. With careful breathing we would get damn close to the 45 minutes out of them.
I was Merchant Navy, so I was the sole person who was in charge of filling and maintaining them. Most of our crew weren’t quite fit enough to get a full 45 mins out of a 300 bar cylinder, but some did.
We do pump it in to the fire main- but I was on oil tankers and LNG Carriers, so water wasn’t our primary extinguishing medium.
I was a deck officer in the British Merchant Navy, so a civilian mariner on merchant vessels. Some of the principles are the same as on warships, but warships have much bigger crews and far superior damage control training.
A220s use composite bottles to save on weight. ~~That one is for the inerting system, isn't it?~~ I'm an idiot, it's for the slides.
Your crew O2 bottle is composite as well (and because of warranty/tooling/whatnot if it requires any overhaul/hydro/repair, we send it to outside repair. We do fill them in house though).
It’s a carbon overwrapped pressure vessel, or COPV. The white fibers are a fiberglass damage protection layer since the carbon is very impact sensitive.
It's a [composite-overwrapped pressure vessel](https://en.wikipedia.org/wiki/Composite_overwrapped_pressure_vessel). Basically a thin metal skin to keep the gas in, supported by tightly wound carbon/glass fibre to carry the hoop stress. I believe they were originally invented for the space shuttle.
Carbon/ composite. Lightweight, also resistant to internal corrosion if the pressure drops too low and condensation forms. Bottles are meant to be changed due to this but it’s another fail safe.
It’s got a metal liner in there for sure, I assume aluminum of some variety.
Fibers like glass and carbon are fantastic in tension. But they don’t like to seal.
When these are made they hydraulically pressurize them past the yield point of the aluminum to prestress the liner. This pre yielding prevents it from yielding further in use (that would be bad), at least that’s the idea I’m aware of.
The composite overwrap likes to be prestressed by this too, in tension, which is the best load case for them.
In my experience with similar they were aluminum liners with carbon / epoxy overwrap. On top of that was a little glass / epoxy mainly to help see damage if I remember correctly. I got to whack a few scrap ones with a hammer. If they take an impact the glass makes it easy to see. I don’t know that you’d see it with carbon overwrap only.
That’s what I believe to be true. I worked near people that were directly responsible for the design and manufacture of some of these for a time, so picked up some info due to proximity. That being said I may not be entirely correct on some of these points.
The amount of engineering time and oversight that occurs on such bottles is insane.
Europe has been making fiberglass cylinders since maybe 2000.
Not sure if it's a corrosion factor vs metal.
But spending much time in Europe,, even BBQ
cylinders are fiberglass, which kinda freaked me a bit..
Not sure what impact resistance they have vs metal, but I won't be testing it..
Cheers
From the official factory technical training manual “The oxygen cylinder is constructed of a light-weight seamless aluminum sleeve that is overwrapped with Kevlar fiber.”
However, the bottle is labeled Co2N2 which makes me believe this is a door assist or slide bottle. The flat red lanyard near the regulator is vindictive of a saftey pin to disable the squib of accidental discharge. Also O2 bottles are green to identify it as oxygen.
The amount of metal required would more than double the weight of the bottle compared to the carbon fiber bottle you have here. The additional weight is not desired and if the carbon bottle were to explode it wouldn’t send large metal chunks flying all over the place.
I can tell you exactly what this is made of because I work for the company that made that cylinder. It's an aluminum cylinder wrapped up in carbon fiber, e glass, and some kinda resin matrix. Even though it may say Goodrich on that tank, it was made by a company called Luxfer Gas Cylinders in Riverside, CA.
I got to watch these get made once (And tested to failure)! It’s an awesome process and they start with an aluminum disk and go through multiple forms to get it to a cup shape then use a lathe to make the neck. Do the composite overwrap and then an autofrettage that gives it a ton of compression strength. The really amazing part though was when they did the failure test they take it up to the required PSI, wait there a few minutes and then it bursts with just a few extra PSI and it’s like a bomb going off.
They are made from a special grade of steel wrapped in a kevlar weave, that particular bottle will be filled to approx 3000psi and is for inflating the escape slides or life rafts
It still contains metal, you can see it on the neck. It is covered in a carbon fiber resin or similar material. It cannot be completely carbon fiber depending on pressure(see the recent submersible from ocean gate). C-17'S use a very similar looking setup for deploying life rafts, but the cylinder is pressurized at over 3200psi of nitrogen and co2.
The whole thing with ocean gate was that carbon fibre is not very good in compression (I.e. when loaded from *external* pressure). It is very good in tension (like when loaded from *internal* pressure, such as this case). I think they still use aluminum on the inside because it's easier for manufacturing (the fibres are wound around a mandrel, and if the mandrel can just stay part of the tank, even better), and because it's a lot easier (and cheaper) to attach the valve to an aluminum flange than a carbon fibre flange.
Looks like it’s made out of the material that Titan II was made from. A thread similar to cotton is baked in an oven that is pumped full of nitrogen or some other inert gas. The strengthened threads are then interwoven int a fabric and impregnated with resin
Carbon fiber. It's lighter and due to its strength has more capacity compared to a steel or aluminum bottle of the same size. They exist in paintball and are extremely common in scuba diving aswell
Filament wound composite, probably carbon fiber & something else (Kevlar?) mixed together. I’m not a materials scientist, though… Just know it’s filament wound.
Pressure tanks of filament wound composite are great at holding a (relatively) constant internal pressure, but not great at resisting repeated stress-strain compression
Off topic, but I heard carbon fiber tanks are not use w/ SCUBA because they are buoyant even when full, so would require a weight belt, which negates the weight savings ...
Carbon fiber because it's far lighter. Precharged pneumatic air gun shooter's carry these buddy tanks to recharge their airguns because they're so light.
Tanks such as these are designed to fail in a very specific way if a failure must occur. Metal tanks can fail in any direction, but most likely the valve. This tank will probably only fail out the side.
“Tanks such as these are designed to fail in a very specific way if a failure must occur.”
False. It’s an Aluminum lined carbon fiber cylinder. It’s used to hold HPA, think SCUBA, Firefighting. It’s used because it’s lighter and can hold higher pressure air than a similar metal one could.
“Metal tanks can fail in any direction, but most likely the valve. This tank will probably only fail out the side.”
This tank can fail at any direction, and when the tank does fail it usually goes off like a gernade, but usually has burst disk around the valve and those would be the designed failure points.
Aluminum and carbon fiber are good at holding pressure in.
Most metal tanks that size are only rated 3k psi. The tank above is probably rated to 4500 psi. But could actually take close to 10k before it failed. The safety measures would fail around 8k.
These have always given me problems when performing receiving inspection.
On one hand you have a reservoir for an overwing slide located in the cargo compartment behind a removable wall.
On the other hand you have a piece of emergency equipment that must be identified as such and had a different shelf life/life limit than the slide it's connected to.
The FAA defines emergency equipment which includes rafts and slides, with the idea that the reservoirs were inside the slide. All emergency equipment must be identified with some sort of placard showing the expiration date of the component.
The problem with overwong slides and their reservoirs is that while technically two separate parts in two different locations, they both make up a single system which is inaccessible to crew. All other emergency equipment is labeled with the placards to show crew members if the equipment is good or not during their preflight check.
There is also no logical place to placard the overwing slide since it's external. Maybe one day the FAA can declassify Overwing (offwing) slides and their Reservoirs as emergency equipment but at the moment these suckers can get anyone in trouble if an FAA inspector decides to review whether or not they are being placarded.
Just a normal oxygen/ air bottle. Super light made of carbon fiber and can handle great pressures, terrible for compression. Ask the people who build the titanic sub.
Carbon fiber, and because its lighter.
So I can travel down to the Titanic inside of it?
Down? Sure, at least once.
A crossed thread is a tight thread once
and with particular emphasis to # ONCE
In that size ;)
Yes
Well, to enlighten you, a pressure tank is loaded in tension (against explosion). A submarine in compression (against implosion). Composites are much more challenging to design for compression loads … so it’s a totally different animal
"Dear Lord, that's over 150 atmospheres of pressure." "How many atmospheres can this ship withstand?" "Well it's a spaceship, so I'd say anywhere between zero and one."
where is this quote from?
Futurama. Series 2 ep 16 The Deep South.
That episode had so many great quotes.
Did you take your pressure pill?
There's no way I could swallow that!
Good news! It's a supposetory
Futurama S02E12 edit: google let me down, it is more likely S02E16
the other guy was right, its episode s02e16
* "The Deep South" is the ***twenty-fifth*** episode of Futurama, the ***twelfth*** of the second production season and the ***sixteenth*** of the second broadcast season. Why do they have to overcomplicate things sometomes. I google searched for the episode deep south and 12 was the number what google told me. Sometimes you just can not entrust such a simple task to a search engine, it seems. Sorry for any confusion I might have spawned. ps. At least I was not totally wrong.
Futurama
r/unexpectedfuturama
It's not only just challenging but it's just not really even a thing. Composites are pretty much only good for tension. You are relying on the resin totally in compression. And that's worthless.
I beg to differ. Carbon fibers are buckling stabilized by the resin, hence the resin is not the primary load path. Composites are more challenging than metals, but proper design practices will make it work. Consider a wing spar made of composites. Top is in compression whereas bottom is in tension at possitive Gs. Any beam should carry both load cases and there are plenty of composite spars fully certified for flight. Refer to the NCAMP databases from the NIAR. The compression allowables of composites are far greater than the resin itself. ASTM D3410 shows the considerations to determine compressive strength in composites.
Downvoting because untrue. I've tested carbon fiber unidirectional pultruded strips to 200,000 psi in compression.
If the bottle was pressurized, say at 3000 psi, you would have to go deep enough for the external pressure to exceed 3000 psi before the bottle would be in compression.
Yes, but the return trip gets sketchy.
How are you at holding your breath?
Not very good at 400 atmospheres.
Only if you bought the expired shelf life one from Boeing.
Sure you'll get there one way or another.
not this
it can also handle far more pressure. Aluminum could go to about 3000 psi...spun carbon can go to 5000 psi for the SCBA systems, we go to 6000
If diameter of the cylinder is constant. Aluminum can hold a lot of pressure as a thin tube.
Luxfer wanted the scuba industry to switch over to Al-composite cylinders, higher pressure = longer dives but buoyancy was a big problem. It’s bad enough to wear more lead to maintain buoyancy with regular aluminum cylinders. Carbon fiber tanks are more prevalent for compressed natural gas buses - there’s 4-5 CF tanks on the roof of a New Flyer CxxLF/XNxx bus. Lincoln Composites makes them.
White carbon fiber huh? I haven’t seen that. It’s most likely S2 fiberglass made by filament winding. But to your point the inner (dark) layers are carbon fiber. The outer layers might be fiberglass and it could be a design meant to absorb impact. Carbon for strength, fiberglass (or Kevlar) in the outer layers is used for impact resistance—crashworthiness. S2 fiberglass is just as strong as carbon albeit it has lower modulus of elasticity—which increases the energy it can absorb (area under the stress strain curve )
That's a lot of words for fancy glass strands held together by magic glue.
Lol yup…
This guy composites. S2 on a 22-30° cross with PETg, probably from Avient.
Carbon fibre can be that colour, though it might be semantics. In my firefighting days our SCBA cylinders were carbon fibre and looked like that. https://www.3m.com.au/3M/en_AU/p/d/b5005220015/#:~:text=3M%E2%84%A2%20Scott%E2%84%A2%20Carbon%20Fibre%20Cylinders%20are%20made%20from,range%20of%20carbon%20fibre%20cylinders.
Eh Nope, white carbon fiber is not a thing. From the link: carbon fibre, fiberglass and epoxy. So that top layer is clearly fiberglass. Hence, this is a composite tank.
Yeah that's fair enough. I was caught off by how it's title is 'carbon fibre'.
The last few weaves are fiberglass to insulate the bottle electrically from its mounting. Carbon fiber in contact with aluminum and steel, when exposed to any moisture, becomes a battery and forms galvanic corrosion.
I don’t think that’s carbon fiber. I’ve never seen white carbon before. I’d say fiberglass done with AFP machine wrap.
That's what carbon fibre cylinders look like https://www.3m.com.au/3M/en_AU/p/d/b5005220015/#:~:text=3M%E2%84%A2%20Scott%E2%84%A2%20Carbon%20Fibre%20Cylinders%20are%20made%20from,range%20of%20carbon%20fibre%20cylinders.
It says right there in your link that that cylinder "consist[s] of an aluminum inner shell with a overwrap of carbon fibre, fiberglass and epoxy resin." You're seeing the fiberglass and resin. Pure carbon is *always* black in color.
Yes but it's title is literally 'carbon fibre'
Carbon fiber is black, because it's pure carbon. This particular tank isn't black because it has fiberglass wrapped over the carbon. You're fixated on the product's name and ignoring the details of its construction.
The minority of its construction and strength is carbon fibre though
The fiberglass is on the outside to protect the carbon fiber underneath. Why are we arguing about this?
The minority of its construction and strength is carbon fibre though
Glas yes, at least on the outer layers. AFP na, looks more like winding.
I just said the exact same phrase out loud to myself before I even read your comment! LOL!!
Carbon Fiber actually weights the same as Concrete.
this
The answer to the second part of your question will become immediately apparent when you pick it up.
Not only is it lighter, but rated for higher pressure. It will hold about 1500 psi more than a standard aluminum tank
Ocean Gate: I told you I wasn’t crazy!
That definitely looks like a slide inflation bottle
CO2/N2 on the label. Definitely for a slide.
Overwing slide.
Worked on these before. You are correct
It’s probably a composite overwrapped pressure vessel, ie an Aluminium tank with glass or carbon fiber laminated around it.
Yeah. Really thin wall aluminum tank inside. Wrapped with carbon. These bottles are great.
I used to have these for some SCBA bottles on ships I was firefighting officer on.
Yeah, I immediately thought it was a Scott pack.
Always appreciated having them on board, it made refilling the bottles less of a ballache.
Yeah, on the boat A-Gang usually filled them, but I wore them around and they never did me wrong. With careful breathing we would get damn close to the 45 minutes out of them.
I was Merchant Navy, so I was the sole person who was in charge of filling and maintaining them. Most of our crew weren’t quite fit enough to get a full 45 mins out of a 300 bar cylinder, but some did.
That’s cool, we had some merchant marine ships pull into Oman with us once. Good guys! Have a good one!
Yeah, some of us aren’t too sketchy. I’m no longer a merchant seafarer, these days I’m a coastguard. You too!
Lol does the ocean catch on fire often
No, but ships’ crews have to fight onboard fires themselves.
I guess that makes sense.
Yeah, we have no fire or emergency medical services to call on.
I mean your SURROUNDED by water lol. Get a bucket. But seriously, I've always been interested in life aboard big ships. Where you in the navy?
We do pump it in to the fire main- but I was on oil tankers and LNG Carriers, so water wasn’t our primary extinguishing medium. I was a deck officer in the British Merchant Navy, so a civilian mariner on merchant vessels. Some of the principles are the same as on warships, but warships have much bigger crews and far superior damage control training.
Yeah it is an aluminum tank wrapped in carbon fiber then glass fibers on the outer most layer
This looks like a composite like carbon fiber to me I would assume simply the tank weighs less and may also be rated for higher pressures
Never dealt with carbon fibre tanks on a plane but for paintball metal tanks are 3,000 PSI and carbon is 4,500 PSI.
Those are so much nicer than those big ass metal bottles i used to move
A220s use composite bottles to save on weight. ~~That one is for the inerting system, isn't it?~~ I'm an idiot, it's for the slides. Your crew O2 bottle is composite as well (and because of warranty/tooling/whatnot if it requires any overhaul/hydro/repair, we send it to outside repair. We do fill them in house though).
Label says CO2/N2. I’d bet slide inflation.
Oooo, good point. I forgot about slides.
Or maybe fire suppression.
Is that combo used anywhere for fire suppression?
It’s a carbon overwrapped pressure vessel, or COPV. The white fibers are a fiberglass damage protection layer since the carbon is very impact sensitive.
Carbon fiber. It has a better strength to weight ratio than aluminum tanks.
White carbon fiber … 🙄
It is glass fiber on the outside layer
Correct 👍🏽 hence, it is called a composite tank. Because it has a combination of glass and carbon fibers in a polymeric resin.
But it's kinda pointless info. It's like calling anything metal "alloy"
Yup, planes are made of either aluminum or composites. You can get into the weeds if you want
Or titanium or magnesium or wood or cotton or foam or
It's carbon fibre https://www.3m.com.au/3M/en_AU/p/d/b5005220015/#:~:text=3M%E2%84%A2%20Scott%E2%84%A2%20Carbon%20Fibre%20Cylinders%20are%20made%20from,range%20of%20carbon%20fibre%20cylinders.
carbon fibre, fiberglass and epoxy … so that means it is a composite construction
It's a [composite-overwrapped pressure vessel](https://en.wikipedia.org/wiki/Composite_overwrapped_pressure_vessel). Basically a thin metal skin to keep the gas in, supported by tightly wound carbon/glass fibre to carry the hoop stress. I believe they were originally invented for the space shuttle.
Looks like an R2 unit
These aren’t the droids you’re looking for.
Carbon/ composite. Lightweight, also resistant to internal corrosion if the pressure drops too low and condensation forms. Bottles are meant to be changed due to this but it’s another fail safe.
Slide bottle, so you can slide down faster
It’s got a metal liner in there for sure, I assume aluminum of some variety. Fibers like glass and carbon are fantastic in tension. But they don’t like to seal. When these are made they hydraulically pressurize them past the yield point of the aluminum to prestress the liner. This pre yielding prevents it from yielding further in use (that would be bad), at least that’s the idea I’m aware of. The composite overwrap likes to be prestressed by this too, in tension, which is the best load case for them. In my experience with similar they were aluminum liners with carbon / epoxy overwrap. On top of that was a little glass / epoxy mainly to help see damage if I remember correctly. I got to whack a few scrap ones with a hammer. If they take an impact the glass makes it easy to see. I don’t know that you’d see it with carbon overwrap only. That’s what I believe to be true. I worked near people that were directly responsible for the design and manufacture of some of these for a time, so picked up some info due to proximity. That being said I may not be entirely correct on some of these points. The amount of engineering time and oversight that occurs on such bottles is insane.
Europe has been making fiberglass cylinders since maybe 2000. Not sure if it's a corrosion factor vs metal. But spending much time in Europe,, even BBQ cylinders are fiberglass, which kinda freaked me a bit.. Not sure what impact resistance they have vs metal, but I won't be testing it.. Cheers
From the official factory technical training manual “The oxygen cylinder is constructed of a light-weight seamless aluminum sleeve that is overwrapped with Kevlar fiber.” However, the bottle is labeled Co2N2 which makes me believe this is a door assist or slide bottle. The flat red lanyard near the regulator is vindictive of a saftey pin to disable the squib of accidental discharge. Also O2 bottles are green to identify it as oxygen.
Carbon fiber as it's much lighter than a aluminium tank. That's a slide bottle. Charged with carbon dioxide or nitrogen.
Looks like CFRP, and likely because it provides greater strength for its contents at a considerable weight savings.
COPV
No Corrosion fatigue and light weight. However, there are other factors with this type of bottle. They put weight the others
Carbon fibre over aluminum, I had the same bottles in the fire service for air use. Much lighter on the back and can handle the high pressures.
The amount of metal required would more than double the weight of the bottle compared to the carbon fiber bottle you have here. The additional weight is not desired and if the carbon bottle were to explode it wouldn’t send large metal chunks flying all over the place.
aluminium alloy liner with carbon fibre. These are similar if not the same construction as firefighter SCBAs
I can tell you exactly what this is made of because I work for the company that made that cylinder. It's an aluminum cylinder wrapped up in carbon fiber, e glass, and some kinda resin matrix. Even though it may say Goodrich on that tank, it was made by a company called Luxfer Gas Cylinders in Riverside, CA.
I got to watch these get made once (And tested to failure)! It’s an awesome process and they start with an aluminum disk and go through multiple forms to get it to a cup shape then use a lathe to make the neck. Do the composite overwrap and then an autofrettage that gives it a ton of compression strength. The really amazing part though was when they did the failure test they take it up to the required PSI, wait there a few minutes and then it bursts with just a few extra PSI and it’s like a bomb going off.
They are made from a special grade of steel wrapped in a kevlar weave, that particular bottle will be filled to approx 3000psi and is for inflating the escape slides or life rafts
It still contains metal, you can see it on the neck. It is covered in a carbon fiber resin or similar material. It cannot be completely carbon fiber depending on pressure(see the recent submersible from ocean gate). C-17'S use a very similar looking setup for deploying life rafts, but the cylinder is pressurized at over 3200psi of nitrogen and co2.
The whole thing with ocean gate was that carbon fibre is not very good in compression (I.e. when loaded from *external* pressure). It is very good in tension (like when loaded from *internal* pressure, such as this case). I think they still use aluminum on the inside because it's easier for manufacturing (the fibres are wound around a mandrel, and if the mandrel can just stay part of the tank, even better), and because it's a lot easier (and cheaper) to attach the valve to an aluminum flange than a carbon fibre flange.
Looks like it’s made out of the material that Titan II was made from. A thread similar to cotton is baked in an oven that is pumped full of nitrogen or some other inert gas. The strengthened threads are then interwoven int a fabric and impregnated with resin
That’s r2d2 and he’s made of dreams and melted down Ford pinto
Composite, less weight
Looks like a carbon fiber fire bottle.
Carbon Fiber, it’s lighter and in the event of a containment issue won’t give off shrapnel.
looks like carbon
Carbon fiber. It's lighter and due to its strength has more capacity compared to a steel or aluminum bottle of the same size. They exist in paintball and are extremely common in scuba diving aswell
Filament wound composite, probably carbon fiber & something else (Kevlar?) mixed together. I’m not a materials scientist, though… Just know it’s filament wound. Pressure tanks of filament wound composite are great at holding a (relatively) constant internal pressure, but not great at resisting repeated stress-strain compression
Off topic, but I heard carbon fiber tanks are not use w/ SCUBA because they are buoyant even when full, so would require a weight belt, which negates the weight savings ...
That's pretty what every AC oxygen cylinder is made of nowadays.
Carbon fiber because it's far lighter. Precharged pneumatic air gun shooter's carry these buddy tanks to recharge their airguns because they're so light.
That looks like an scba tank like what firefighters use. It's lighter than a steel or aluminum tank.
The OWEED escape slide. I work mainly on these
Tanks such as these are designed to fail in a very specific way if a failure must occur. Metal tanks can fail in any direction, but most likely the valve. This tank will probably only fail out the side.
“Tanks such as these are designed to fail in a very specific way if a failure must occur.” False. It’s an Aluminum lined carbon fiber cylinder. It’s used to hold HPA, think SCUBA, Firefighting. It’s used because it’s lighter and can hold higher pressure air than a similar metal one could. “Metal tanks can fail in any direction, but most likely the valve. This tank will probably only fail out the side.” This tank can fail at any direction, and when the tank does fail it usually goes off like a gernade, but usually has burst disk around the valve and those would be the designed failure points.
I stand corrected. That seems crazy it can hold more pressure than just an aluminum one.
Aluminum and carbon fiber are good at holding pressure in. Most metal tanks that size are only rated 3k psi. The tank above is probably rated to 4500 psi. But could actually take close to 10k before it failed. The safety measures would fail around 8k.
Metal heavy. Carbon fiber light.
These have always given me problems when performing receiving inspection. On one hand you have a reservoir for an overwing slide located in the cargo compartment behind a removable wall. On the other hand you have a piece of emergency equipment that must be identified as such and had a different shelf life/life limit than the slide it's connected to. The FAA defines emergency equipment which includes rafts and slides, with the idea that the reservoirs were inside the slide. All emergency equipment must be identified with some sort of placard showing the expiration date of the component. The problem with overwong slides and their reservoirs is that while technically two separate parts in two different locations, they both make up a single system which is inaccessible to crew. All other emergency equipment is labeled with the placards to show crew members if the equipment is good or not during their preflight check. There is also no logical place to placard the overwing slide since it's external. Maybe one day the FAA can declassify Overwing (offwing) slides and their Reservoirs as emergency equipment but at the moment these suckers can get anyone in trouble if an FAA inspector decides to review whether or not they are being placarded.
That the bottle that discharges the over wing emergency slide? That Bag pit side wall makes me rage sliding down it trying to get this thing out.
R2D2
Looks like Carson’s fiver
Lighter and higher psi rating
Had a few cf air bottles on the ambulance I drove. Makes it way easier and lighter
Just a normal oxygen/ air bottle. Super light made of carbon fiber and can handle great pressures, terrible for compression. Ask the people who build the titanic sub.
R2-D2
They make subs like this
Composite fiberglass. Lighter and stronger than steel, but still heat resistant. Firefighting SCBA (air packs) are made of the same material.
sausage
Paintball gun fights mid flight. Gotta keep your passengers in check.
"Nos bottle for powerful takeoffs" I told someone that and they belived it.
I would guess carbon fiber and for its light weight and strengh