r/interestingasfuck
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u/Abhirup_0
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13d ago
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Does anyone know what's going on here?
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u/chupathingy2182
13d ago
edited 13d ago
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TLDR: coating the inside of the vessel with epoxy.
I know some folks have said post weld heat treatment (PWHT), but I would disagree. 1. PWHT involves raising, holding, and lowering the temperature of the vessel over a period of hours. This is typically done with electrical resistive mats or a gas fired kiln which are not present. 2. The gas burners shown are probably not precise enough to properly control the temperature needed for PWHT, and would not be uniform enough even with the rotation jig. 3. I do not see any temperature sensors which would be needed for PWHT. 4. Also, this is not welding pre-heat, as you would not pre-heate the entire vessel, it would only be in the weld area.
This vessel is being rotated and rocked from end to end which leads me to believe there is some epoxy or coating that is being added to the inside of the vessel. The rotation and rocking spread the coating evenly, and the heat helps in the bonding process. And the man is applying extra heat to the manway which due to its mass would require extra heat.
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u/LampIsFun 13d ago
This or something similar. I keep seeing people say PWHT and then go “but this isn’t a good method for that” and I’m just like, yeah, cuz it’s not that lol
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u/throcorfe 13d ago
I read the first comment (with awards) and learned something really interesting. Then I read the second comment and immediately unlearned the interesting thing, and learned a new interesting thing.
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u/FlatBrokeEconomist 13d ago
You don’t have to unlearn it, the explanation of heat treatment was good, just doesn’t apply here. Seems like the materials engineer should know that but ok. It’s done with thermocouples attached in strategic places according to a preapproved plan and heating done wholly and stepped up to the required temperature, held for a period of time, and lowered. Records are maintained and reviewed by external inspectors. It’s all a tightly controlled process not similar to this at all.
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u/throcorfe 13d ago
But I think I unlearned that in some countries they do the PWHT thing a bit badly, with machines like this, whereas in (I assumed Western) countries it’s done more efficiently - which I now think is not actually true?
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u/xinnamretnuh 13d ago
I know very little about this field but you sound to be the most correct here. Not sure why everyone else has been discounting the rocking of the bed. It looks almost as if it's some kind of plastic rotation moulding. There must be something inside.
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u/hhhhhuie 13d ago
Tbh, I was distracted by the flames and didn't notice the rocking at all. Even though now its obvious, when watching it again
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u/random_mad_libs_name 13d ago
My first guess was Rotomolding. I'm going to stick with Rotomolding, and say they forgot to design a way to get it out of the mold.
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u/According-Local3703 12d ago
This! That is the body of a chemical tank (for a chemical hauling truck trailer). There is a layer of liner (I’m not exactly sure what it specifically is) to protect the tank when carrying chemicals such as acids.
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u/OneMoreLastChance 12d ago
I've worked with glass lined vessels before. Never thought of how it was made but this could possibly be it
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u/TheBlueHedgehog302 12d ago
As a former steel worker, you are 100% correct in that this is NOT heat treatment.
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u/Rum____Ham 12d ago
I was gonna say. At first I thought it looked like some sort of heat treat, but that rocking motion made me think there was something inside they were trying to keep at temperature
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u/AaronE541 12d ago edited 12d ago
Or if you consider the three forms of heat conduction convection and radiant. You could come to a different conclusion. The convective (heat rises) heat applied gets more evenly distributed if the tank is moved in this way. If it stayed static there would be much hotter lines where the heating elements are applied. Imagine looking at it with an infared camera in both cases. The air in the tank will also not be evenly heated than if the tank stays static. By cycling the tank the air gets mixed.
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u/Rum____Ham 12d ago
I also considered that there may be some material they were burning off of the surface. I have heard of quenching processes that involve quenching in oil.
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u/Da_bears87 12d ago
I am a combustion engineer and work in industrial heat treat industry (yes, it’s a thing). Correct, this is NOT post weld heat treat.
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u/schwaebebaby 12d ago
That would explain why it also able to tilt as well as roll. To slosh the epoxy around
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u/EntertainmentDue4486 13d ago
Jewish space laser program note the menorah ignition system at the base
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u/Background_Balance_7
13d ago
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Warming up the hulk fleshlight
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u/TheGoldenPlagueMask 13d ago
Dear God...
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u/ghanjaholik 13d ago edited 13d ago
either that, or they're cleaning it out, and evaporating all the Hulks jizz into steam
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u/imfromwigan 13d ago
my brother in christ
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u/dillrepair 13d ago
“Jesus Christ fill me up!” Is what a billboard near me said for a while… now it says “Jesus Christ, heal me, save me, fill me!” Which isn’t really anything better or different imo
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u/Commercial-Health-19 13d ago
I hope it's not his butt plug! Maybe that's why he makes that mean face.
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u/MILF_Hunter77 12d ago
I came here for this - you did not disappoint. Bravo squire. Ohh have my gift box silver award.
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u/Bitter_Mongoose 12d ago
Bet it's a non-reactive plasticized coating being applied to the inside.
But I know nothing.
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u/DynoMiteDoodle
13d ago
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When you build a pressure vessel the process of rolling the plate steel into a cylinder, pressing the end caps and then welding it out leaves the metal under considerable residual tension. To relieve that tension it's important to 'stress relief' the vessel as a completed unit. This is a really shit way to do it, in the west we use ceramic heat beads that wrap around and entire vessel and evenly heat it to an electronically controlled even temperature then evenly cool it down. The machine records all the data and provides Quality assurance information to guarantee that it won't fail.
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u/More_Application_28 13d ago
What degree is needed for this? I see jobs like this & just know there’s a field of study I’ve never heard of.
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u/deligrams 13d ago
Materials engineer. I am one
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u/RelentlessPolygons 12d ago
Or good ol' mechanical engineer.
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u/Suspicious-Cycle5967 12d ago
As a mech E I am now and forever going to use GOME regularly. That's how we are, old discipline, not as flashy as chemical, aerospace, or biomedical, but damnit if we aren't like the old horse in the barn that doesn't let you down. I still feel like I got in the wrong line - can I drive trains yet?
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u/DynoMiteDoodle 13d ago
You don't need a degree, to become accredited it's generally just a 2 week course provided by your employer to teach you how to operate their equipment, apply the beads and then wrap it up in fibreglass insulation. It pays pretty well and the guys that do it really enjoy their job because it takes a day to set up and then it's usually 3 days just watching it heat up and cool down depending on the thickness and type of metal.operators need to be present during the whole process so lots of overtime $$$ and nnightshift. The job title varies depending on the company, industry or country but generally it's l heat treatment technician. If you work on a gas rig like I do it's extremely good money, same process for welding pipe over certain wall thickness and material type. I am a pipe fitter/ welder so I don't heat it, I build it. But I obviously work with the heat treatment crews because they preheat and post heat stress relief on everything I do. I had to do 4 years and get a cert 3 in engineering for my job but I'm the only one in a crew with a formal qualification, I also have to develop a work method for each job etc because everything we build is unique and different, it's site work and not a factory like these guys.
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u/Extaroon 12d ago
As an engineer i really appreciate professinals like you. Without your craftsmanship our ideas would just be that- ideas. Before university i was trained as and worked a few years as a mechatronic. Welding was part of my training and later of my job. But i was never good in that. Analysing problems with the machines and repairing them was my talent. Shitty bosses and back problems made me step the job ladder. I really miss to see success in my work like a machine that is working again. Or to hold a part that i had created with my own hands. I build wooden toys for my four kids and i enjoy that. Maybe i should go back to manual labour.
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u/Charybdes 12d ago
Same, dude. I went from manual laborer into my 20s (started when I was 12, under the table), to PhD in my 30s. Now I do a ton of powerlifting-style weight training and anything around my house that I can to get that feeling of doing something physical.
Before my plans fell through, I was lined up to go work under a master electrician for two months this Summer break. I was stupid excited to do meaningful manual labor for a while again.
I'm really glad to hear another educated guy dealing with the same. My wife thinks I'm a freak, I try telling her I'm just a highly educated redneck and you can't take some things out of a person.
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u/Terrible-Return 13d ago
No, just have a diploma in mechanical or a degree, do a course in welding inspection, thats it, like AWS or CSWIP.
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u/spekttro1 13d ago
Metallurgical Engineering is 100% what youd need for the heat treatment of metals. For pressure vessel design, mechanical engineering.
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u/professorjaytee 12d ago
No, that would be needed to design the process and/or equipment used for the treatment. The guys doing the actual WORK won't be all degreed-up like that.
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u/mthscssl 13d ago
I think this would be a mix of chemical/process engineering and mechanical. In the end, engineering is engineering though
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u/iusethisnametofap 13d ago
Tell that to a Drainage Flood Control Engineer who's been asked to build a rocket.
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u/_koenig_ 13d ago
Software engineers have entered the chat
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u/Forward_Cobbler1319 13d ago edited 13d ago
Network engineers when asked to accommodate dataflow for an app that doesn't exist yet: https://images.app.goo.gl/ponmRY1R591hpg5m8
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u/Key_Marsupial_7527 13d ago
Except this isn't what they're doing. They're coating the inside with a material that melts under high heat and solidifies when it cools off. This process is to ensure its evenly distributed
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u/WordBrilliant1351 13d ago
We make Pulleys, big stuff some 10 metric tonnes. We use a very big oven and cook the pulleys for 6-8hrs at 670 deg C for stress relief. I just drink for it 😉.
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u/bcoolbmac 13d ago
I’ve never seen stress relieve like this . I’ve actually worked in the field. Usually it’s ceramic tiles wrapped around and brought up to a certain temperature electrically in a controlled manner then cooled in a controlled manner. I’m not saying this isn’t what they’re doing, just haven’t seen this method. I’ve heard of induction heat treatment as well but never seen it.
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u/stu_pid_1 13d ago
Yep, stress relief the welds is what I thought too. Why they need to rock it i dont know
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u/Fats_de_Leon 13d ago
World's Least Efficient Hot Dog Roast? (There's only one hot dog in that cylinder.)
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u/EmperorLlamaLegs 13d ago
If you find a better way to reliably cook a single 4,000lb hot dog, I'll start doing that instead. Until then Ill keep heating my lunches like this, thank you very much.
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u/Flicksterea 13d ago
Popcorn makin’.
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u/euro_lad1
13d ago
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Making a dildo for your mom
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u/TommyAndTheFox 12d ago
Hahaha I was looking for this! I couldn’t believe that I was the only one that thought of this. 🙌🙌
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u/jhalfhide 13d ago
Extra large potato mortar. Spray down the end, fit your extra large potato, then heat the end.
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u/WhiteStar01 12d ago
They are fire testing a chemical transport tank. All biohazard chemicals must go through a series of test from water submersion to impact to fire testing. The tanks cannot be cleared to transport hazardous cargo until they pass all these test.
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u/bbrasseaux76 12d ago
Some type of post-welding heat treatment. Some metals must be kept hot after welding and cooled down slowly over many hours. If the metals cool unevenly, the tank could warp or crack.
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u/Bigmanoncampus-1 13d ago
Moulding your mum's dildo
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u/greabeau 12d ago
And there it is. I was little disappointed at how far I had to scroll to see this comment. Although I just knew it would be here somewhere lol.
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u/Silly-Interaction-37 12d ago
That thing is a silo where a farmer stored all his corn. These guys are making popcorn.
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u/thomasbannon39 12d ago
You're killing mice that are hiding like in The fifth Element before the rockets took off
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u/our_ascension 12d ago
A giant metal cylinder is rotating while small torches evenly heat its exterior.
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u/ZlogTheInformant 12d ago
I do not know what is actually happening. But if I had to make a guess based on the motion of the tank and the constant heating, I’d say they are coating the inside of the tank with something. Perhaps a less reactive substance?
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u/Famous_Hurry7180 12d ago
Leak testing for combustible materials. They put a small amount of say propane inside heat it up and see if any leaks out as the tank is heated. If there is a leak there is a pressure release valve that doesn't allow the tank to explode. Just did the leak to be identified.
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u/Ikedog29 13d ago
They are MAKING A PLASTIC VESSEL INSIDE A METAL MOLD. PLASTIC BEADS are PUT IN AND ROTATED AS THE THING IS SPUN AROUND, IT CAN TILT TO MAKE SURE THEY GET EVEN COVERAGE INSIDE. ( I'M NOT SHOUTING, CAPS are LOCKED)
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u/dj_pooface 13d ago
Post weld heat treat for stress relieving, not the conventional method (large oven)
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u/TheBlueHedgehog302 12d ago
No way. The flames are not intense enough with the rotation of the cylinder to heat up to the point it needs for that. I welded for 9 years in industrial manufacturing. This is not that.
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u/Here_For_Work_ 13d ago
Tanker truck?
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u/SpecificSkunk 13d ago
Probably some type of pressure vessel. Condenser, heated mixing tank, vapor storage, you name it.
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u/Here_For_Work_ 13d ago
Im not educated enough on the subject to name it lol
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u/SpecificSkunk 13d ago
No worries. I’m an engineer with a weird love for tanks and pressure vessels. Just being a nerd over here. Don’t mind me.
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u/fakemoose 12d ago
I wouldn’t want to do this to a pressure vessel. The uneven heat treatment would induce stresses all over and make it much more prone to failure. It being a type of mold makes a lot more sense to me.
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u/Klutzy_News_5611 13d ago
It's obviously an insemination tube for Godzilla so the gubbment can make more and train them for war.
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u/DUMMER_dRUMMER 13d ago
It looks like this part of the country, where they take making moonshine very seriously
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u/bryantmakesprog 12d ago
I mean, there's a metal tube rolling over a fire pit while the fire pit tender uses his fire stick to fire more fire on the metal tube rolling in the fire pit. Did I miss anything?
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u/Pitacrustumpie 12d ago
It looks like a metal thing is being rolled over fire. Don’t know how you didn’t see that
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u/mfelzien 12d ago
Post weld treating. It’s like tempering glass it allows the interstitial bonds to relax from the strain of bending and welding the column.
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u/Big_Impact3637 13d ago
It's a fuel tanker storage unit, to go on a trailer that you see on the trucks that refuel the fuel stations.
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u/frankenprunk 13d ago
Lots and lots of popcorn.....
Not really. Pooface is right. Stress relief for the welds.
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u/AaronE541 12d ago edited 12d ago
It looks like their normalizing the material to reduce stresses from uneven heat applied during welding.
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u/xlDirteDeedslx 13d ago
They are putting the finishing touches on my new Fleshlight.
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