Hydrostatic Testing a 95-Year-Old Cylinder - Modern Diver

[@deankay4434]

You have to keep in mind something that many never thought of. The steel used! First, iron ore harvested for the production of steel was a very high grade especially around the “Great Lakes” area of the US & Canada. Ore was testing at 55% or higher in the early part of the 20th Century. Today’s ore is lucky to have 3% iron content per every ton harvested. And this means no recycled metals add to the “Bessemer” iron smelting process creating crankshafts for P51 Mustang aircraft that were designed with hollow crank journals. This idea for this 1978 ASE Master tech is unheard of, until I saw on. Merlin, Allison and others produced entire engines or just parts for the war effort during WW-II. These crankshafts had 12 cylinders and extremely heavy but, engineers figured out if the drill a large 1 3/4” hole in the rod journals and plug them with Welch plugs, oil under pressure did not leak out, provided 80 PSI oil to the main journals. More important to an airplane is weight! This drilling reduced the weight of crank by 70lbs! Huge… NASA estimates that it takes $100,000 dollars per pound to place an object in outer space including satellites, in 1969 dollars! Wow! But oxygen tanks, Sherman tanks, aircraft steel parts had virgin iron used to produce steel, no used scrap. Those days are forever gone unless a new deposit of rich iron ore is found. Pure magnetite is only found in meteorites after striking the earth. The “Great Lakes” region has a thick bowl shaped deposit of hard rock called “Dolomite” that keeps water from leaking out, and what makes “Niagara Falls” so stabile from a large amount of erosion, that would cause it to wear & recede into Canada further than it has. Dolomite in many places is called “Iron Stone” because of its durability. The earth is a wonderful place and the US sits upon thousands of miles of this hard rock formed by mile thick glaciers over areas like New York. While the continental plates shifted over millions of years, the North America land mass pointed North & South and joined Europe. Iron particles in volcanic areas find pointed North / South and the Midwest was near the equator. It was tropical, dried, salt underground form thousands of acres under Hutchinson Kansas and under the Great Lakes back toward Pittsburgh! Ask Morton where they get salt? Why are dinosaurs bones found in Nebraska, South & North Dakota into Montana! Think about this! You high pressure tank will most likely last decades more! DK, Omaha.

[@jn2957]

Im in school for respiratory and i thought this video was pretty cool! Thank you

[@cryoine7194]

this tank will probably out live us all

[@janjanboquia6738]

😂

[@nspro931]

That symbol is not for good luck, it is a manufacturer's mark of some kind, well known in the industry

[@donanything6816]

Very cool! Thanks for the video.

[@chriserickson4417]

Very interesting. Good job on the video. Thank you!

[@tobedetermined4180]

Super cool! Did you restored?

[@midas693]

Cool video man! Wondering if you think that ultrasonic testing will take over from hydrostatic. Considering it is faster and more accurate, and no removal of the valve or emptying of the cylinder required

[@WaschyNumber1]

Very cool video 👍🖖

[@phredzilla]

What did you stamp on the cylinder???

[@aldricazucena9598]

You talking about the Swaztika? I saw that too lmao

[@janjanboquia6738]

whta is the name of the gauge to check the surface rust and how do you used that? how deep should the pitting rust be that will result to it failing. what will happen to cylinfer if it failed the hydro test.? how important is the water jaket?coz here in the philipines we dont use those.

[@profuse007]

Can you do a shop tour?

[@graemepace5183]

What cylinder clamp are you using to remove the valve?

[@sickle40]

hi im writing from chile nice video I have my own hydrotest , i would like to know more info about digital pressure manometer and where can I buy one. How do you get the calibration? thank you

[@spoofer20]

Those are called pressure transducers, in my country we have to recertify them every year by an independent company.

[@cjohnramos]

I've hydo tested a LPG tank from 1928 haha

[@jackmclane1826]

Hydrotesting is the single most damaging process you could do to these cylinders. Water and steel, not properly drying it on the inside. Add oxygen from the air, and there goes your tank. If you just kept it dry... pretty much all tanks would last 100 years.

[@SeersantLoom]

These cylinders have to be tested regularly. Using liquids is the most safe way to do it, or so I'm told. So, any suggestions with what to replace the water?

[@jackmclane1826]

@@SeersantLoom I know the requirements, but if the cylinders are not properly dried, the testing alone is severely limiting the lifetime of the cylinders.

[@steventraum5203]

I want to see a follow up in a 2027.

[@mq9886]

2Q. are the test to be different if cylinder use oxygen or nitrogen gas

[@denisradichi3012]

No, doesnt matter the gas as long as you keep the work pressure

[@mq9886]

🌹🌹🌹🌹🌹

[@mq9886]

Why percentage 1.8 is meaning pass what we doing if result become 2 or 4

[@phredzilla]

All 3 series cylinders have a 10% margin.

[@earthstewardude]

I still don't understand how the process works. The tank is filled with water and submerged in another sealed tank but from there, I don't know where the pressure is applied. Is it possible to show another video that explains every step of the way? Or can you recommend a video that shows how all this works?

[@The4Crawler]

Alec Peirce has a good video on the process: kzbin.info/www/bejne/ooe8lnmGnb1khacsi=2pQtphpYGmMxp7ny Tank pressurized, it expands and forces water out of the test chamber. That water is collected, volume measured (159 in this video). Then pressure released, that excess water is sucked back into the test chamber and what's left it measured (3 in this video).

[@johnfogarty4360]

From what I saw looks like the he is measuring the water pushed out of the tub thing. as the cylinder expands under the test pressure .

[@mandoramos1183]

Shouldn't you let the water stabilize for 8 hours at least??I'm pretty sure the water inside the cylinder should be at room temperature before it gets hydrotested. And its a cylinder not a tank.

[@bigbudzz]

I bought one at an estate sale for $20 bucks are they worth anything

[@bigbudzz]

I wanted to exchange it for a full aluminum to use