Speaker A
So, legend has it that if you take a potato and put it under extreme pressure and heat, then explosively release that pressure, the potato will peel itself.
Engineer builds a high-pressure steam device to peel potatoes and other fruits, capturing the process in slow motion with surprising results.
Ask about this video. Answers come from its transcript only — with the timestamp, so you can check them.
Generated from the transcript and can be wrong — check the timestamp.
Key Takeaways
- Rapid pressure release of superheated steam can peel potato skin effectively.
- Building a safe high-pressure vessel with viewing capability is complex and requires careful engineering.
- The process works on various fruits but results can vary and are not fully understood.
- Safety precautions are critical when working with high pressure and temperature systems.
- Slow-motion filming reveals detailed insights into the peeling mechanism.
What the video covers
- The video explores the legend that extreme pressure and heat followed by rapid pressure release can peel a potato.
- The creator designs and builds a high-pressure steam boiler and chamber to test this theory safely.
- Engineering challenges include machining stainless steel, creating seals, and designing a pressure vessel with a viewing window.
- The device uses superheated water under pressure to generate steam that rapidly expands and peels the potato skin.
- Safety is a major concern due to the high energy stored, equivalent to multiple sticks of dynamite.
- The experiment is filmed in slow motion to observe the peeling process in detail.
- The device is also tested on other fruits like apples and strawberries with unexpected results.
- The video includes detailed explanations of the physics behind steam peeling and the engineering solutions implemented.
- The creator shares the iterative process of building, testing, and refining the device.
- The video ends with a sponsorship mention and reflections on learning and engineering challenges.
Chapters
- 00:00Introduction and Theory of Steam Peeling
- 01:31Design Challenges and Safety Considerations
- 02:54Machining and Building the Boiler
- 05:32Constructing the Pressure Chamber
- 06:59Assembly and Features Overview
- 10:04Testing and Observations with Potatoes
- 19:10Testing with Apples and Other Fruits
- 26:18Final Thoughts and Sponsorship
Full Transcript — Download SRT & Markdown
Speaker A
Wo! I wanted to see this for myself in slow motion, which meant building a device to do this that I could see into, which is a lot easier said than done.
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It's storing the energy of three sticks of dynamite, and it really wants to blow up, but I'm using engineering to try to make it not do that. It was so dangerous, I had to make a blast chamber and run it remotely. The results
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exceeded my expectations. And it also turns out you can peel other stuff with some pretty unexpected results, and I really don't understand what happens to strawberries. My wife certainly enjoyed it. I think she really appreciated a potato peeler with a three-stage 47-point
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checklist. I feel like I'm diffusing a bomb. So, this general idea is not new. This is how they supposedly peel potatoes for potato chips and things where you can't have skin on it. I've tried to find videos of it online, and there's
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nothing. And that is why I'm doing this project. I want to see what happens to the potato. If you're wondering how pressure and steam makes a potato peel itself, it's actually pretty simple. Steam transfers heat to things a
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lot faster than air. So, when it surrounds the potato, it will heat up the skin really fast. It'll do it so fast, the heat will only penetrate a little bit below the potato skin. The water just under the skin of the potato
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will get so hot that it would boil if it weren't under pressure from the steam.
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It's like a pressure cooker. But if you quickly release all the pressure, all the superheated water under the skin of the potato will boil and expand.
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But it's trapped under the skin of the potato, so it'll just pop it like a balloon and it should just come off the potato. At least in theory, which doesn't sound that bad until you realize the temperatures and pressures that
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we're operating at. I find pressure cookers very scary. Like I'm just looking at that thing waiting for it to just explode in my face. And this is going to take pressure 10 to 20 times that of a pressure cooker. So I've been
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thinking how to actually do this practically. To make the steam, I'll make some kind of strong metal pressure vessel filled partially with water and an immersion heater in the water, which will heat up the water, but it won't be
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able to boil because it's in a closed container like a pressure cooker. So it'll get hotter and hotter and higher and higher pressure. And then I'll put some kind of valve on top of this. If you open the valve, the pressure will
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drop, which will let some of the water instantly turn into steam. It's called flashing. So, this will be our steam generator. Then we'll make another sealed container that we can attach to the steam generator that we can put a potato in. Now, if you turn it
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on, the steam will expand and go into that chamber and heat up the potato. And then, if we attach another valve to this chamber that's normally closed, we can open that once the potato's heated up to release all
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the steam pressure and do the peeling. And then something that's going to be tricky is seeing into this chamber because I want to film what happens to the potato. But this is a high pressure, high temperature vessel
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and they really don't like having holes in the side of them. So it's going to take some engineering to figure out how to do that. So it's actually a pretty simple thing. The hard part is just going to be designing it so
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that everything can withstand the temperatures and pressures and be safe because there's an enormous amount of energy in this. So, I guess it's time to do some engineering and see if we can give a potato the absolute worst case
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of the bends you can imagine. We're making the boiler out of a thick stainless steel pipe and some thick plates to close the ends. But it won't seal unless the ends of this pipe are flat and smooth, which they are not.
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This is dangerous. If I start machining on the end here, there's a good chance the forces of cutting into this are going to just knock this out of the chuck and make it fly across the room.
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99% chance it would hit me in the face. So, we need to make a fixture, which is making a thing that's going to help you make another thing. Sometimes you need a fixture to make the fixture to make a thing. Although, this one's
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pretty simple. It just holds up the end of the pipe so it doesn't fly out.
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Almost everything on this is stainless steel, which can be difficult to machine. It can work hard in where it gets much harder to cut, which will just break your tools. So, this is a project that really makes me appreciate
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the water jet. It can do 90% of the work on all the flat parts, and there's really nothing to it. It just works. To get a good seal between the pipe and the end caps, I have to make some
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gaskets. This is a fairly soft, high temperature silicone rubber. And I could cut these on the water jet, but it's pretty easy to make them by hand.
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This is the valve that will let us release steam from the boiler. And it attaches with an annoyingly complicated stack of seals.
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And then after that, it's just a matter of squeezing the cylinder and the gaskets between the two plates. The pressure of the steam is going to be pushing on both these caps with about 10,000 pounds of force. So, I'm using a
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special grade of rods that can withstand the stress at an elevated temperature. So, now that it's all put together, it's time to accessorize. The first thing is the heater. This is a 2 kW 240 volt immersion heater. It'll sit
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in the water, get really hot, and heat it up. And then next to that is the drain plug, which is a great thing to have next to 240 volt wires. And I have a way to make this not as dangerous as
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it sounds. And then up top, we need a way to open and close the valve. So, I'm making this little thing to let me attach an air cylinder, which lets me open and close it remotely with some air
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valves. So, now we just need the potato pressurization zone, which you might call the chamber. And just like the boiler, it starts life off as a section of stainless steel pipe. And I also made all its flat parts on the
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water jet. Although there is some cool five-axis stuff to help me with my welds.
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Being able to cut a relief like that is so handy. If you know, you know.
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The construction of the chamber is pretty different because I need to be able to get in and out of it all the time to load specimens. So, it's designed totally differently and is mostly welded. Once all the
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individual parts are the right shape, it's just a matter of welding them all together to make a more complicated part that hopefully is also the right shape. And this is why no one has ever paid me to weld for them. All
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the heat and stress from the weld shrinking distorts the tube, which is a problem because the inside surface is a seal. So, I'm using my manual mill to bore it out to a nice smooth round surface.
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Now we just need to make the two things kiss, which is easy. They already, you know, they like each other. Wasn't hard to do.
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Making a door that's easy to get on and off with a window that can withstand the temperature and pressure was challenging, but the design ended up being pretty simple. And then a bit more accessorizing, and this thing is ready
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to go. So, I've got it mostly together. And I can give you a little tour of all the various features. So, this down here is the boiler. As the water heats up, it's contained, so the pressure will increase. And on top of the boiler is
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this valve, which I modified to be air operated. This will let me open it without being anywhere near this thing.
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And up here is the chamber. This is what's going to hold our potato or whatever other...
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as possible. It'll be really loud to release that pressure. So we've got a muffler which hopefully won't restrict the flow too much. The door has this kind of weird construction. There's the front stainless steel plate which is what gives everything the structure.
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Then we have this aluminum disc thing which is what does all of the ceiling.
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There's an O-ring on the outside which seals against the inside face of the chamber. And there's another O-ring on the inside of it which seals against this glass disc. And the glass disc just sits inside the ring. The force of the
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pressurized steam will push the disc into the stainless steel plate. And these little 3D printed plastic pieces are just to keep it from falling out and breaking. And I decided to go with O-rings instead of a a face seal because
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a face seal is just more sensitive. You have to have everything cranked down really nice and evenly. It's just easier to have a leak. So, I designed the boiler for a specific pressure and temperature. And so, I have this
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mechanical safety valve. It's made for steam. And if the pressure in the chamber gets above 200 PSI, it'll open very quickly and vent the pressure, which will prevent any boneheaded mistakes from causing this to detonate.
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But this makes a whole other danger because if I set this port open, it could just shoot super hot steam at [music] you. So, I have some extra plumbing to route the steam down.
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There's a muffler so that it's not too loud when it comes out. So, the design of this boiler with threaded rods holding the two plates on the end is unusual. Normally, it would just hold the top and bottom of this on with a
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flange, just like the chamber does. I just don't trust my welding enough to do that. So, I designed it this way, which eliminates the welding, but it introduces some new actually more subtle dangers. So when the boiler heats up,
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this tube is going to expand and get longer. And the threaded rods are also going to expand, but the stainless steel expands more, and that's going to try to stretch the rods. [music] And if you run the numbers, the stress of the boiler
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stretching out these rods will take them about 80% of the way to failure. [music] If you just bolted these threaded rods on top and bottom, there's a good chance that it would fail, which is what the stack of washers below this nut is for.
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[music] These washers are actually a special kind of spring called a Belleville washer. And they have a sort of cone shape. And if you push on them really hard, that cone will flatten.
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They don't move very far, which is why I have four of them stacked [music] on top of each other. So, initially, when everything's cold, I'll tighten the nut to compress these washers down a predetermined amount, which should put
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enough force [music] onto these plates to hold in the steam. But the ble won't be bottomed out. So, when this thing expands, [music] it'll push this plate up and it can compress the Bville washers further. And that'll take up
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[music] the slack and should keep everything nice and safe. Now, you're probably wondering, I'm so afraid of welding flanges onto the boiler. Why did I weld a flange onto the chamber? And [music] it really just comes down to the
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amount of energy that we're talking about. This thing is like probably multiple sticks of TNT [music] of energy in this. It has an enormous amount of superheated water in it that can all flash to [music] steam and it would be
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very bad. The chamber is only gonna have steam in it. So much less energy than the boiler if [music] this thing blew.
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I'm sure it would blow the door off and it'd be really cool and scary, but it just wouldn't be that bad. So, I just felt more comfortable welding that. I did not feel comfortable welding this.
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But before we try to pressurize this thing with steam, I don't want to find out if it doesn't work catastrophically.
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[music] So, I'm going to do something called hydro testing. This is commonly done for pressure vessels. [music] And it works by filling the thing you want to test up with water and then pressurizing [music] that water beyond the pressure you plan to operate at. And
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if it doesn't explode, then you know you should be good. And you do this because it is way safer. Because if [music] you think about air or steam, as you pressurize it, you're compressing it like a spring. And if [music] this thing
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fails, all that compressed gas can expand very quickly, which is very dangerous. That's [music] what's basically an explosion. But water at these pressures is basically incompressible. It It's not going to expand in that dangerous way. It'll just kind of go.
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I'm using a highpress air pump and a small buffer tank to do the pressurization. It's a little sketchy, but not really dangerous. Just kind of sketchy. Starting with the chamber because I'm just less scared of that than the boiler.
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Well, that's not good. So, once again, this is why no one has ever paid me to weld anything. But I found my stubby torch, so I can fix it now. And you know what? This just turned into hydro
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testing hell. I would fill it up, [music] test it, get some leak, take it apart, fix it, put it back together, fill it up again, have some other issue, repeat that too many times. Although, I did eventually work through all the
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issues. [music] And it was a lot better to do this with cold water than very hot, very angry steam.
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All right, everything works. No more excuses. It's time to test this thing. Uh, well, we do have to install everything back on it before we can do that.
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And I also forgot I have to build a control panel for it, which is what I'll be using to operate it remotely. It has controls for the valves. It also lets me monitor and control the temperatures.
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It's incredibly important for controlling this thing, but there's also not really anything to it, so not a lot to show. And I should probably clean up the shop because it's getting kind of dangerous.
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And I should probably also beef up the blast shielding a little bit. Not because I'm afraid of something catastrophic, more to shield me from any kind of steam leak, cuz even a small one could cause pretty bad burns. All right, we're done
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with all the excuses. It's time to test this thing. The peeler does have startup and shutdown procedures with [music] checklists as well as a firing procedure and checklist because it would be easy to do something wrong and get really
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[music] messed up. All right, potato. Nice knowing you. It controls pressure indirectly with temperature because if there's liquid water and the steam is saturated and you know it's temperature, you know it's pressure.
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Come on, baby. Uh-oh. Do I hear leakage? Oh, I hope not. So, the safety release valve was leaking. I cooled everything down and took it apart and was able to receat it with some high pressure air. And when we
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charged everything back up, it's leaking around where the heater screws in. And since the pressure was really low, I tried to tighten it, but I didn't turn off the power. Well, I did accidentally.
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[music] In a stunning display of you get what you pay for, my $5 500 pack [music] of wire splices split apart when I twisted the wire one half of a turn and shorted out. [music] I'm going to give them a
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bunch of layers of Capton and avoid twisting them in the conduit. All right, let's try this again. So, this can go up to 200 PSI. We're doing 20 PSI just to make sure everything works. It's probably not going to peel a
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potato. First thing [music] we do is charge it. Things are getting steamy. All right, closing the vent.
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All right, vent in three, two, one. Yeah, that didn't do much. So, the skin is kind of loose. It's not nothing. I think this potato [music] needs more power. First thing we do is charge in 3 2 1.
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All right, we will close chamber now. Vent. All right, this is amazing. Look at this. It almost worked. The skin is cracked off the side of it. We're getting really close. All right, 40 was [music] good. We need more power.
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Charging the chamber in two one. Ice lost an enormous amount of energy. All right, let's try that again.
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Discharged now. I think that pretty much almost worked. And oh, hot potato. Ah, we can't really see the potatoes sitting on the bottom of the chamber. [music] So, I made this.
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It's the simplest possible thing I could imagine to hold a variety of things in the [music] middle of the chamber.
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And while we're at it, we should just give it more power. Charge. All right, vent in 3 [music] 2 1.
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That was dramatic. The skin is getting ripped off and plastered against the window [music] like some horror movie. Man, I would not want to be in this chamber.
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Although the skin is coming off, [music] this is almost working. That is crazy, man. It just takes the skin right off.
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Okay, goodbye potato. [music] Obviously, what we need is more power venting in three, two, one.
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Yeah, it works. [music] But I want the skin completely off. More power. All right. Charging in three, two, [music] one.
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Venting in three, two, one. The potato skin's getting pinched against the window, which doesn't [music] help. It's hard to say this isn't just working, but I'm not stopping until I get the potato naked. That sounded different in my head. All right,
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I think I figured it out. We need more power. Charge in three, two, one.
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Inventing in 3 2 1. It's naked. Yes. I knew that it was going to [music] work.
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No. Yes. That is exactly what I imagined. It's so good. The potato just says goodbye skin. My people need it or something.
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I am so pleased. [music] This is I got to save that before it's gone. Wow, one piece came out of all the indentations perfectly. And there's almost zero potato in the skin. That's like perfect potato yield preservation. I think at
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200 PSI this would be even better, but I can't because the heater's leaking again where it screws in. And it gets bad at higher pressures. I've tightened it as much as I can, but it's not stopping.
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This is a bigger fix. But it doesn't really matter because it peels stuff. Let's see what happens if we stick other stuff in here. So, an apple is probably the most [music] obvious thing. Charging venting in 3 2 1.
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It looks like Voldemort just cast one of the worst non ya spells on this apple.
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[music] It's one messed up looking apple. Smells like apple pie in here. All right, you got to check this out. [music] If you look closely, you can see the skin separating from the apple as the steam is vented. Man, that's awesome.
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What are you going to [music] do to a tomato? Seems hard to peel. Charging.
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All right, venting. That looks interesting. [music] This might actually be the worst Harry Potter spell.
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[music] It definitely skinned it. Wow. I don't think I've ever seen a peeled tomato before. They're creepy. All right, place your [music] bets. Will it do anything to this lemon as a It's a thick skin.
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All right, closing the charge and venting in 3 2 1. Oh, it smells like lemon big time.
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That's weird, man. Little pestules appeared and then were squeezed [music] like lemon zits or something.
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It's a lot of force to tear a lemon skin. So, maybe with a higher pressure and temperature or a faster release, it could work. Maybe we'll try it if we have time. What is with this guy? Has he
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seen the size of this project? It's not going to happen. Seems like people will say that peeled grapes are kind of a high society thing.
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So, let's see if we can join the upper crust. All right, charging in [music] two one.
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Venting. It looks very uh mey, which [music] it either really messed up the skin or it peeled it. Let's see.
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That looks like some special effect from Inception [music] or something. What is going on? So, it looked crazy on the camera like it was just messing [music] up the skin, but I think it actually peeled it. Look at this. All right,
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let's see what a peeled grape is like. Oh, that's too No, thank you. So, a blackberry seems like it would be pretty hard [music] to peel. Charging.
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Uncharge. Venting. Now the Blackberry appears to have left the building. [music] All right, let's try that again. All right, closing the charge and venting in 3 2 1.
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All right, it's kind of hard to see, but I think what happened is all the little berry bits just [music] exploded. The liquid came out and just an empty blob of fleshy skin was left over. All right, strawberry. What do you think it's going
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to do? Shoot all the seeds off the side. Maybe charging in three, [music] two, one.
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Closing the charge. Venting. It smells like strawberry. I'll tell you what. Whoa. What on earth, dude?
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Looks like [music] super meat boy. All right, let's see what this highspeed looks like.
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Oh my goodness. I would not have expected [music] that. It looks like the strawberry turned into strawberries and cream.
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If I made all my predictions of what would happen, this wouldn't even be in the top 100. But I can't tell what actually happened. It's like the [music] skin came off. I'm pretty sure this is not the skin, but the seeds are still
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there. Maybe. I mean, it certainly did something interesting. I don't know if it did something useful. Very interesting.
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All I just wanted to give you a heads up. My camera somehow turned on its beauty filter. It's creeping me out, too. So, just try to ignore it. So, I was just showing my friend Dustin some of the footage from this thing, and
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[music] he's really smart. It's probably why his YouTube channel is called Smarter Every Day. He made me realize that this thing actually generated more questions than answers. There's [music] just so many unexplained interesting things. So, I'm going to be making a
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part two. We're [music] going to get footage with a much better high-speed camera, trying to get answers to what is going on with some of [music] these foods. And if you have anything that you think would be interesting to try with
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this, I'm taking suggestions on my Patreon page. And it's kind of silly I'm talking about part two because I'm not even done with part one. Like I don't even know what my wife thinks yet. So let's find out. You ready to see some
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stuff? Yes. So what do you want to peel? I got greens beans [music] potatoes tomatoes.
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Tater. Tater. All right. So the first thing to do is close the peel vent. Yeah. Press that.
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Oo. Nice. All right. So, the temperature is in range. That's what we're checking. Pull out the charge lever.
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There you go. Feel like I'm diffusing a bomb. Now, when this gets to zero, close the charge.
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Okay. Now, pull, peel, [music] and watch this screen. Whoa. It's like a magician. Whoa.
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Chick has been hatched. Is that how chicks hatch? [music] Oh, I see the peel back there. It's like a bug with its wings back. It's very nicely peeled. Yeah. So, you want a rating?
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Yes. Rate me. Rate my potato. Kind of lumpy. It is very cool. Very satisfying. But six out of what?
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10. I was going to say out of seven. That seemed awfully low. Okay. No, but it's a Okay. It's a prototype. [music] Yeah.
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It exists to peel one potato on camera. [music] And I said it does a great job at that.
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So, you gave it a six. All the work. All the work. You have to put on your future vision glasses where [music] you see the man that this boy could become.
Speaker A
Well, you didn't ask me to rate your future grownup man. Potato peeler. [music] She keeps me motivated. If she gives me a nine, I'm going to kick back and say, "Well, I did a [music] good job. What else is there to do?" You did give me a
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high score for something else. Golf club. That was [music] uncharacteristic. The next day she's like, "Nine. What was I thinking?" I was going to say, "Everyone slips up sometimes." Yeah.
Speaker A
Well, our daughter had a great idea. Popcorn. That is a really good idea. I think that's how those street vendor like explosive [music] popcorn makers work.
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The pressure keeps the popcorn from popping. Then when you release the steam, they should all just instantaneously [music] pop if it works right. They make corn cobs that you can pop. We just need to get one of those.
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We'll do it. There you go. Something I've been thinking about is my kids. [music] And I don't talk about them very much. I actually have three, which is wonderful. And they're just getting into school, which has me asking
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important questions like, do I start them off on the CNC [music] machine or do I give them the rusty chisel? Because the rusty chisel worked pretty well for me, but [music] they just had access to tools that I could only dream of when I
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was a kid. Like, if I wanted to learn something, I had to go to the library [music] and find the one book with a little black and white picture of what I was interested in. Nowadays, they can learn
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anything, which is why I think this video sponsor is really important. It's the best tool that I know for learning technical stuff, and it's called Brilliant. [music] And the way it works is really smart. It has thousands of
Speaker A
lessons across math, programming, AI, and [music] they teach you with a combination of lessons and interactive problems, which really helps you absorb the information. But the [music] big news, which when I saw it was just like, of course, that makes so much sense.
Speaker A
They added a tutor, which is just a legitimately great application of AI, makes me think of all the times [music] my daughter's been learning programming.
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I have to sit next to her the whole time. Whenever she gets stuck, I explain things in different ways. If I wasn't there, she would go on until she got stuck. Try really hard for a while, but then give up. The brilliant tutor is
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doing the same thing I was. If you just don't get something, it'll explain it to you in different ways until you get it.
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[music] They can even draw on the screen to show you things. And just like me, it will not give you the answer. And they've dialed all the courses in for anyone around fifth grade [music] to college. So, if that's you or your kid
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Speaker A
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Speaker A
check it out. All right, my shipment of COBS finally came in. So, let's see what happens. All right, we're at 370°.
Speaker A
That's almost 160 PSI. Our leak is leaking quite a bit at this pressure and temperature. Here [music] we go.
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Charging. 3 2 1. [music] That is really cool, but it's not quite popping it. I'd say that's maybe 70% popped. I think we just needed to be hotter. And it could go hotter if it weren't for the leak in the boiler,
Speaker A
which I'll be fixing before we do [music] part two. So hopefully we can take the machine all the way to the limit and truly pop one of these cobs.
Speaker A
So if that sounds interesting, consider [music] subscribing so you don't miss it. And I'll see you on the next one.
Speaker A
[music]
Topics:potato peelingsteam pressurehigh pressure vesselengineering projectslow motionsuperheated steamsafety engineeringStuff Made Herefruit peelingpressure cooker
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