Pressure Testing the Boiler Shell! Pennsylvania A3 Switcher, Part 7
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- Опубликовано: 14 окт 2024
- This episode on Blondihacks, I’m hydro-testing my A3 boiler barrel! Exclusive videos, drawings, models & plans available on Patreon!
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Hey everyone! Turns out I was mistaken about regular tapered pipe threads not being intended to have sealant. That’s what I get for going off script without looking that up. 😬 If anyone asks, I say incorrect things just to get the comment engagement. I swear.
Of course the exception is NPTF, also known as DrySeal, which uses deformation of the threads to create the seal. We’ll say that’s what you meant 😉
I was taught (Toolmaker, not boilermaker) Brass on steel makes a good seal. Brass on brass, pain in the ass. Copper on anything will strip like a ... Well it will just strip.
Congrats on the pressure test....Thank you mam 👍
Might be worth checking the calibration on your finite element analysis machine.
I was surprised by how many special fittings were required to pressure test your boiler at this point, but I'm so glad it passed with flying colors!
Every piece of a steam thing you build requires at least five new custom fittings. It’s a rule of the universe. 😄
@@Blondihacks Why don't you just pop in at your local Steam Fittings & Loco Supply store?
@@g.tucker8682 You mean the one that closed down back in 1923? Seems like only yesterday.
The dramatic reenactments are always top notch 😁
How I wish we could do hydrostatic testing in the HVAC world. Nothing more frightening to someone who has seen a pressure vessel explosion than testing refrigerant systems to 600psi with nitrogen. Only thing second to that is having a 3/4" line full of refrigerant fly apart at 300 psi and dump 30lbs of freon in half a second because another company had used crimp fittings and forgot to crimp one final joint on an elbow. Three of us had a code brown that day.
True, it would be nice to be able to do that.
Machining mixed with software development life cycles! I’m in love!❤❤❤
OMFG Quinn!!!! You are now officially my hero! I am a software engineer for a major medical device company and I am constantly arguing why unit testing is cost effective and critical! You just NAILED my arguments entirely!
I notice machinists like to pet their work even if they are not checking for chips or burrs. I guess you bond with your work and a nice pet won't hurt. Well, unless it is not de-burred. I'm amazed with the speed your project is progressing.
A kiss at the end too 😂
29:20
Only NPTF (dryseal) tapered threads don’t require sealant - NPT threads are designed to be used with sealant. Awesome work - enjoy your videos - they are all gems!
The suspense was intense, during the pressure test.
Yeah... I really felt the pressure.
Ba-dum-bump...
Brilliant episode, well they all are, but the nervous tension waiting for the leak that never arrived was better than watching a Hitchcock horror movie.
Nice one 👍
Oh boy, the best part of Saturday afternoon 😊
Since I'm kind of a new viewer I end up watching a bunch of your older videos. I have experienced this before with other channels but what is surprising and great about your channel is how you maintained consistency through the years. Sometimes maintaining a formula is a good thing. I may lean politically and socially liberal but for many things, I am very conservative. I hate CHANGE. I miss the old days when TV programs followed a formula for YEARS without trying to "shake things up" as they do now. I've seen your videos from 2 to 3 years ago and although editing, delivery, writing, and video quality have improved, it isn't a shock to the system to watch an older video compared to the newer ones. It gives me something to fill the gaps between new video releases. Also, it appears that you've been doing this long enough that you aren't going to burn out because of too much work any time soon. It is funny though when I watch an older video and say "Hey wait a second! Didn't she get a new one of those things a long time ago?"
She does have a well developed style.
I feel she has changed and experimented, but it's slow and subtle such that it's not that noticeable and always an improvement
Quinn, hey if the boiler fails you can always fall back as a hand model... 🤪
Your narrations are great...
Have a great day.
While watching this, the thought crossed my mind of the incredible patience, focus, experience, and skill required for your successful result. I'm not a "technical person," but you might be interested to know the same spirit, dedication and mindfulness is required to grow bonsai, which IS a passion of mine. I doubt 2 hobbies could be further differentiated, but the same spirit is recognizable to me. This is why I so enjoy your videos. Thank you!
Also, I laughed previously at your "trees/wood" jokes in an earlier episode. Wood is alive and does not always do what we tell it! 😉🤣
Once again I've learned something at this channel. For example, who of you already knew that a successful preliminary test on your project earns it a heartfelt kiss? See 29:21.
I really cannot wait to see this thing finished! It know it will be a few years, probably, but I really hope that you dont give up!
I love the "extended" metalworking techniques that I have seen so far!!
First time I've seen a successful boiler test end with a kiss! LoL 😂😆
Great job 👍!
A friend of mine worked for a well known high end vapour blasting manufacturer. Their machines had hideously complex gaskets. They were all just silicone sealant - smear it on, assemble, let it cure and turn the machine on. The beads cut perfect gaskets every time!
I love how your channel really communicates how these projects can steamroll together to increase your shop's capacity and ease. Specifically the indicator holder on the mill, and then the water feed pump can also do pressure testing, because if I think about it for a second of course it can.
It did give a good test of the feed pump as well. Now she knows that it can more than supply the pressure she needs.
Congratulations!!!! Well Done
Great video , your workmanship is really something to behold.Most people videos say we tested the boiler and it was good .Not you each step is described ( good or bad ) this has got to be one of best hobby machining video I've seen . Thanks
Great Job Quinn!! All the attention to detail in the silver soldering paid off.
I think I've heard you mention 3D printing in the past. Another option for making your own o-rings (and other gaskets) might be 3D printing them with TPU. I made an o-ring that was round but the cross section was oval so as it was crushed down it would expand to seal better. +15% flow rate to compensate for stretching, plus slow and hot made for good layer adhesion.
Thanks for the video!
I feel so smart after armchair machining for so long: I said to myself, "Self, I wonder if the end-plates need to be clocked so the rods clear the other features?" when you were so carefully aligning the plug hole. I'm allowed to be smugly correct only once per year. (And, to be clear, no shade! You have made something here that I'm pretty sure I couldn't ever do while also filming each step.)
"A lot of those disciplines have really cool things that you might not have otherwise know about."
The number of times I've used my Cricut for jigsaw templates or a t-square for sewing..
Yep. I've used my O frame reloading presses more than once to move a stubborn pin. Great when it's too small for the hydraulic press.
When hydo testing submarine systems I use sheet rubber as a blank flange gasket glued to the blank. It makes the blank seal on all shapes as long as it is flat.
I love the dramatic reenactments hahahahahaha
After a while, you'll end up with box full of those custom adapter fittings. Then you can pretty much fit anything together. Saves a day when you really need to fit that HDMI cable to the garden hose!
Congrats Quinn! I think that's twice now you've had a virtually perfect test.
The only thing I would do different is to cut a groove in each plate to hold the flat back up ring, one to make sure side pressure would not move it, and gives less surface area to the water to push on!
@13:00 Tapered threads DO require dope or tape to seal. Thread shape leaves a gap at the peak/ valley all the way up the helix. One can often get them to seal in softer materials. But the expectation should be to use some type of thread sealant.
If you have a "machinist fit" on your straight threads, you can get them to seal similarly in smaller sizes. Which is likely why you have such good outcomes getting reliable seals. Tapered threads can be thought of as a poor man's shortcut to the properties of a machinist fit. Sealing for the rest of us using mass machined interchangeable parts:)
And the steam dome thingy block off plate WAS non-explodey. Well done.
Thanks, and Meow to Sprocket.
The only thing I would comment about your hydrotest fixture is that its a good practice to have machined grooves or shoulders (which you call registration features on your channel) which can locate the tube diametrically on either ends and also possibly hold both those ends on the same axis/centerline. And also they become the features to hold the seals, in a way that your seals get slightly stretched as you insert them over/in those shoulders or grooves.
For such low pneumatic pressures, both rubber and teflon backup rings work well as long as they are stretched and inserted correctly to sit flush with all the surfaces to be sealed. O-rings will never be the correct size that you want them to, so if you had a registration feature you could easily stretch the next smaller size and still get an excellent seal.
I belong to the Metric/ISO world, but the one thing in hydraulics I like from the American system are NPT threads. I'd take taper threads for fluid sealing almost any day over parallel threads. M14×1.25 threads are uncommon even in our world but its not surprising to see gauges use fine threads like these as they can hold strength over short thread engagements.
A great way to pressure-test is to fill the boiler with water, and then screw in a zerk fitting, which is a check valve. Then attach a grease gun and start pumping grease into the fitting. Achieving several hundred psi with a grease gun is super easy. Sure, a small amount of grease may enter the tank, but it's a very small amount, so cleanup is no big deal. I haven't proven this, but have read that a manual grease gun will deliver up to 15,000 psi. 200 is no problem at all.
You've got this guy about to turn blue. I'm breathing again. Thanks a lot!
Looking good! One point about npt. There is always a path on the thread ridge/trough interface so you always have to use sealant. There is an nptf (f for fuel, not female) that has sharp ridges and troughs with the intent of not needing sealant which could break off and plug an engine fuel system. And, of course, they're really finicky to use.
It's good to know you always have a shell to retreat to under pressure!
Congratulations Quinn, this is a big step! Love seeing this come together! Thanks for bringing us along! 😁
I'm no machinist - just a vise, hacksaw, file & mini drill press garage tinkerer - but I really appreciate the time taken on this channel to explain & demonstrate setup & order-of-operation matters. It's a mindset I've tried to adopt and it's made my projects easier & better.
yay! I'm so relieved this went well!
thank you for making these model engineering videos so accessible for someone with no experience but lots of enthusiasm! much kudos
First off I’ll give you my creds. I worked on boilers and boiler systems, both commercial and residential, for 30 years. Not locomotives though, they are different animals. But I have ALWAYS used pipe dope, teflon tape, or other pipe thread sealer. Just because they are tapered doesn’t mean they will seal without it. Pipe dope is sold for a reason. I like teflon tape because it’s not messy but you have to put it on in the same direction as the threads and keep it tight while you’re putting it on. I like to put 2 layers on. The only time I’ve ever had leaks is when the threads are damaged. I hope this helps you on your journey.
Also, if you have trouble with your flange plates not sealing, try machining them with a boss where you want them to seal. It provides a smaller surface area which will increase the pressure on the gasket at that location. The gasket will conform to any small irregularities on the mating surfaces better.
Anyway, great job!! I love your videos!!!
Hey from the UK,
I have just spent the last couple of weeks binge watching your channel like it was parks and recreation!! I just wanted to say thank you for everything you share with us. Being a software engineer, I love and get the analogies you use to illustrate your points! The detail you go into and how you cover your thought process with things like fixturing is an immense help in creating the full picture of what you do and how you do it!
I am all but ready to invest in machine tools so I can pick up this craft properly ( I've had one of those silly unimat all in one machines for years but that simply wont... cut it).
I have just received the Tubal Cain books so I am going to attempt to make the Polly engine. wish me luck!
Once again, thank you for being an inspiration and keep at it!!!!
🥇
Hi, Thanks for the video. It makes my Saturday afternoon when you video notifications pop up.
Thank you for another wonderfully entertaining and informative video. There is a serenity to your videos that I'm sure is enjoyed by more than just me. I am never tempted to just go look at the end product. With your projects it's as much about the journey as it is the finished item. Thanks again.
That was satisfying. Some minor adjustments to the testing rig, but the tank itself is bulletproof. 200 lbs... yipes!
That was a ton of work building all that “scaffolding” to perform the test. Glad it proved successful.
Yaaaay Quinn videos, we all love quinns videos!
I’ve noticed AVE, often says tappy tap tap. I reckon he is having a go at you, in his usual funny fashion. Keep up the good work.
Nah, I think we both got it from Adam Sandler or The Simpsons.
Yay! It's Blondihacks time!!
You can be proud of that boiler . Greetings from germany.
Always good to know it isn't going to blow. Plus, if you ever need to race someone... You know how much extra pressure you could get away with to boost your speed. Like Scotty on Star Trek knowing, "I can give you a wee bit more power, Captain!" :p
The anticipation for this pressure test is literally more exciting than any movie I've seen in the last 20 years.
Hi Quinn The safe way to turn a plug into a safe relief fitting is to make a hacksaw cut through a number of threads on the plug end. When the plug is removed it will bleed air/water but will not be projected out a high velocity. Just leave enough thread engagement. Also tank manufacturers (not necessarily pressure vessels) will often make the hole in the tank smaller than the mating intruding pipe and then bend/form a radius on the opening into the tank shell so that the joint is not a square butt joint. This is typically radiused outward. In your case if you radius inward, then it presents a nice well for the silver solder. Cheers
I'm reminded of the time I used a loop of cord and some landscaping material (a rock) to encourage feeding into a dull bandsaw blade. Not my saw, just pirating shop use.
Congratulations on a successful pressure test for your boiler shell!
Thanks Quinn
Dann, a Video where the machining footage is just like the dramatic reanactment at 20:08 would be absolutly hillarious. Maybe an idea for first of april?!😂
Nice work. For your next boiler make it easier. Just two additional, thin plugs with normal o-rings. Kept by your plates. They are made very fast on your lathe, even when o-rings are sitting in a facial grove. Like your work very much. Learned a lot.
The test system looks very technical. Great work in all.
I second your 'think outside the box store' @16:00. I recently acquired a load of ancient veterinary dental equipment for 25 GBP - it included a pendant motor, with shaft and loads of bits, like a Foredom but more powerful. Not sure what I'm going to do with the equine gags and speculums, but I'll keep them with my other stuff that might come in handy (even if I never use it).
Congratulations on the first attempt hydrostatic test! Getting both the boiler and test setup functioning the first time is a great indicator of all your hard-earned experience.
Good job, Quinn !!!
congrats on the passing pressure test.. looking forward to seeing the next step
Thanks Quinn, very exciting, helps a lot!
...and, loving the comment engagement strat.
Rule of thumb for holes on a flange to get a face seal is
Gotta love McMaster. I know they specialize in Unobtanium, but O-ring backers for a size O-ring that is non-extant is just wild.
It was weird that they didn’t sell the O-rings that apparently fit these backers 😂
I know absolutely nothing about plumbing copper or anything like that but I never miss one of your videos ever I love your work it's just a joy watching you. Oh yeah I work with wood so you know where I'm at again I love what you do I do not miss an episode ever you are awesome
I must admit I geeked out a little while you were pumping up past 150, I knew that since it was getting towards the end of the video that were about to witness one of two possible outcomes. So happy it went well and congrats on a new personal best pressure. How about a miniature steam turbine project in the future?🤔
Hi Quinn, congrats with the boiler test, and thanks for making me laugh out loud over and over with your funny remarks,
big hug from Chris in France.
Three cheers for the super useful hero speed hole!!
Speed Holes- The Silent Heroes
@@Blondihacks
Should I go there? Something about the street pops to mind, but no, I will not go there.
Hi Quinn, BSP (British Standard Pipe) threads have I believe similar threads TPI wise as NPT which are parallel and I am sure would relieve you of all your niggles of producing tapered threads. During my experience, I have always changed NPT out for BSP without any problems. I know it’s more expense but much easier to use. Just a thought. I don't know why you doubted yourself @ 0:09 as nothing horrible happened 😉 I’d call that a win for sure.
That's not just true for software engineering.
It's true for every qualification that needs to be done.
Every tests reduces the risk and if you can qualify a unit or even a component before you system level qualification (with reasonable cost and effort) you should do so.
That is true for software, model locomotive bulids and satellites alike
Show! Congratulations!!
Congratulations on a successful test! I see why you don't like pipe thread - no sealant. I'm not a fan of tapered thread either (BSPT or NPT) but have used it with success up to 6000 psi. Try using thread tape or a thread sealant like Loctite 567. It may take your hate down to a mild dislike. Thanks for another great episode!
well done! 200psi is quite impressive - and you didnt even need to go back and fettle anything!
The concern about the solder joint in the steam dome got me thinking about other possible techniques. A possibility of using a TIG welder with the current turned down by at least half to either solder or braze the joint. Just a thought is all.
200 psi is some pressure, i removed a plug from a central heating system with only one bar and could not put the plug back until all the water had drained.
Congratulations Quinn!
Congratulations, Quinn, that was an impressive first - and also last - unit test for this step! No small achievement!
Neat test video Quinn. Great work on the sealing up plates, covers and plugs. Just a visual aide you may try. Use food coloring in your water test media. Easy to spot leaks, and you can change colors after fixing leaks to distinguish between old and new.
Thanks for sharing.
Oh the luxury i have, i have a treaded rod cutter at my job, alltough expensive, it works like a charm and no problems wit burrs or broken treads :)
Congrats Quinn, a well deserved success. 👏👏👏
Awesome test Blondie 👌 👏 soo glad that the steam vent resess were just that 👍🍹
Well done on your pressure test including all of those one off plumbing fittings. Thanks for the video.
Fantastic!!! Go Girl Go!
Bloody well done there!
I would have just gotten a inner tube and sliced it up, and used the result as sheet rubber. Then just make a sandwich in the press. But I’m a bit primitive that way. 😂
Quinn, you just keep doing it the proper way. Thumbs up 👍
Congratulations on another successful boiler pressure test, awesome work Cheers.
Fantastic work Quinn, this one is going to be great boiler.
well done
Hi Quinn. We used to use Boss White and hemp and later F.T.F tape when we tested pipe details.
For pressures that low, you could also make 1/4" BSP thread instead of the tapered NPT. It will seal absolutely fine with PTFE tape. On the other hand it might require yet another tap for you to buy. I really enjoy watching your content, whether it's boiler building or workshop remodelling.
Nicely done Quinn.👍👍
Having worked with O-rings, you can get a ring that is too small and stretch it. You then adjust the groove to the stretched cross section.
Congratulations on this success !
Well done Quinn! What a great and satisfying result for that milestone. Unit test #1? Check!
Congratulations, Quinn ! I think it's a great idea to pressure test parts unlike the book ( page148) where Kozo-san tests the whole assembly. 13,8 bar doesn't sound like a lot, but when you consider that the inside surface of the copper shell ( without the end plates ) is 602 square centimeters , that means the inside of the copper shell is holding back 8400 kilograms! Wow!
Intro was awesome!
Hi, great video & pleased it was a successful test and a testament to your skill. Can I suggest a stop valve after the check valve & a 'T' piece with a 'blowdown' valve fitted to your test rig. That way you are able lock-in the pressure without relying on the check valve. In fact many boiler inspectors also ask that pump is discounted. Reliving the pressures with a blowdown valve more controllable, so much safer than loosing fittings.
Congratulations on a succesful pressure test at the first attempt.
Pressuring to 200psi (without creating a power shower) is seriously impressive! 👏🎉🍾
The working pressure of the A3 Flying Scotsman was originally only 180psi.
Awesome work 👍
Great work Quinn!