My 3 ARB compressors do about 7 atmospheres. Probably could push is to 10 with a lot more wear & tear with longer term damage.
'Catastrophic implosion': All five people onboard missing Titanic sub confirmed dead'
It probably is a result of compression decomposition cycles, similar to the 'de Havilland Comet' aeroplane cycles, which was then tested in a water tank for the entire hull. Stress cracking for altitude compression decompression was the result of catastrophic hull failure.
Another issue which could have been a key issue was dissimilar material in the hull, putting portholes aside.
Hopefully at least they saw a view of Titanic's bow before the end.
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Apparently the submersible was not licenced, inspected or approved with any certificate by a recognised body. All passengers had to sign a waiver. A former crew member said some parts of the submersible were only good for 1300mtr depths, and safety concerns had been raised before.
I don't understand why the search parties covered an "area the size of Lebanon". The Titanic's location is known precisely, so the submersible would have been released at those exact same GPS coordinates. Then presumably it went straight down. What am I missing?
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I don't understand why the search parties covered an "area the size of Lebanon". The Titanic's location is known precisely, so the submersible would have been released at those exact same GPS coordinates. Then presumably it went straight down. What am I missing?
Not sure, but I guess we will wait until the movie is made and released
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....... the submersible would have been released at those exact same GPS coordinates. Then presumably it went straight down. What am I missing?
All they knew is that it lost contact 1 hour 45 minutes into the dive. Did ocean currents then carry it away? Like air currents, ocean currents often flow in varying directions at different levels.
I'm only surmising here but if the current was going one way at the full depth, but a different direction part way down they could have been carried in different directions. Maybe they had managed to reach the surface and that was a different direction again.
So those searching had no way of knowing if it had already perished and was lying on the ocean floor at those coordinates. The correct course of action would be to search in a wider field while there was a possibility they could have been carried there.
I guess the relevant point is that those searching were far more qualified to make those decisions than us.
I don't understand why the search parties covered an "area the size of Lebanon". The Titanic's location is known precisely, so the submersible would have been released at those exact same GPS coordinates. Then presumably it went straight down. What am I missing?
I dunno how big Lebanon is...or even how/ why that place gets a guernsey in a discussion about a tiny, tiny sub in the Altanic ocean...but wouldn't ocean currents play a part in finding the thing?
Did you see footage of the rear of this tiny, tiny tin can?
The prop looks tiny...or should l say ' looked ' tiny in previous footage.
I don't understand why the search parties covered an "area the size of Lebanon". The Titanic's location is known precisely, so the submersible would have been released at those exact same GPS coordinates. Then presumably it went straight down. What am I missing?
Air search, they were looking to see if it was floating on the surface, it couldnt be opened from the inside so they still had limited air supply.
230 atmosphere is almost 3400 psi, check your units of measurement...
The units of measurement are correct Barney. My maximum recommend operating pressure is 220 bar I fill to 230 bar and it drops back to around 220 on the gauge as the temperature normalizes.
bar = 14.503 psi atmosphere = 14.695 psi .
Landy
-- Edited by landy on Saturday 24th of June 2023 07:42:59 AM
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My ARB compressors have a safety valve at 180psi or in other words 12.4 bar. The pressure regulator/moisture trap is set to 135psi as is the pressure switch. The ARB compressors can go to 150psi with a 150psi pressure switch.
The blue industrial hose lines are rated at 300psi or 20.7 bar.
If your compressor is 220 bars it probably is a 4 stage compressor, probably for filling diving tanks.
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Its a .22 PCP air rifle Barney. It has a 480cc carbon fiber tank and at full power gives me about 60 shots with a muzzle energy of about 33 foot pounds.
I use it for vermin control. and a bit of bench rest target shooting.
As Whenarewethere has suggest it could in theory be used for filling dive tanks, but as it only cost me a couple of hundred dollars I don't think it would last long in that application.
Landy
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I have a small capacity compressor that I regularly take up to 230 atmospheres.
Although in my application I only need to run it for 60 to 90 seconds at a time to achieve that pressure the speed that heat
builds up is incredible.
Landy
That is why I added heatsinks external & internal & fan cooling to this 12.4 bar set up, plus after cooler (third compressor in boot).
Prior to heatsinks the outlet for the start of the hose was over 100°C. Now I can hold the outlet. In a compressor review the ARB was up to 130°C at the hose connection. Standard hoses melt.
For a car there is no need for more than 12 bar or there abouts. You also need volume. My tryres are about 70 litres each & take 28 seconds per corner from 20psi to 35psi. Takes about the same time to charge the system with 4 litre air tank. There is no point going any more as the tyre valve can't cope with higher volume as my compressor are a bit ahead & switch off before tyre can accept air. Actually it take 60 seconds to deflate tyres as per above figures.
This is about a 1kW system.
I would hate to think of the heat produced on a 220 bar compressor. You would certainly need a serious after cooler.
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Thanks Landy, makes sense now. Carbon fiber makes good pressure vessels for containing pressure as everything is in tension. Not so good at resisting external pressure.
-- Edited by BarneyBDB on Saturday 24th of June 2023 06:21:41 PM
Controlling the heat is my main challenge as I don't want to contaminate my tank with condensation. Although the compressor cylinder is water cooled. and I rarely let my tank pressure drop bellow 170 bar in the 60 to 90 seconds it takes to pump up to 230 bar the temperature will lift from ambient to 55c and climbing rapidly.
The metal line with the compressed air, get a longer section & run that through water to cool the air & condense the moisture& a valve to bleed off the water.
You could also refrigerate the air input which will dry the air to start with.
Also dessicant pre dryer.
Every atmosphere you compressor air that is a another multiple of water you add to the system.
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Friend working for a gas extraction company puts 6000 PSI in Carbon Fibre tanks. Carbon Fibre presssure vessel technology is well tested and being used in virtual Gas pipelines in mining. 6000 PSI pusing out seems a reasonable use of the Material.
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The metal line with the compressed air, get a longer section & run that through water to cool the air & condense the moisture& a valve to bleed off the water.
You could also refrigerate the air input which will dry the air to start with.
Also dessicant pre dryer.
Every atmosphere you compressor air that is a another multiple of water you add to the system.
They say life is easier if you plough around the stump. I think I will try filling it in two runs of 45 seconds and let it cool in between. I only fill it about once a month. Landy
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Moisture is in the air whether we like it or not. It's quite eye opening when one sees the condensation inside a moisture trap after pumping up one tyre from a compressor's 7 atmospheres.
Just pointing out some very easy & cheap solutions to reduce water in the system.
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Interesting article in today's "Fitz column" in the Age and SMH - by Frank Owen (Submarine Institute of Australia), regarding Titan's Carbon Fiber hull.
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