The truly scandalous thing here is this: > Depth Validating > As an interim step in the path to classification, we are working with a premier classing agency to validate Titan’s dive test plan. A licensed marine surveyor will witness a successful dive to 4000 meters, inspect the vessel before and after the dive, and provide a Statement of Fact attesting to the completion of the dive test plan. They clearly did not do…
Why isn't Titan classed? (2019)
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Re: Why isn't Titan classed? (2019)
#62Earlier quoted context omitted.
The craft survived several launches - that proved it can do it. Whether it can do it reliably / survive fatigue accross repeated cycles is a different question. Imagine we'll find out as the investigation progresses.
As far as I'm aware, and please correct me if I'm wrong, they had never dove to this depth before. So, sure, it was launched before and recovered, but it never experienced the same conditions which caused the failure.
They did: http://web.archive.org/web/20200814020351/https://www.oceang...
(At least twice, and probably more times).
Re: Why isn't Titan classed? (2019)
#63> OceanGate’s submersibles are the only known vessels to use real-time (RTM) hull health monitoring. With this RTM system, we can determine if the hull is compromised well before situations become life-threatening, and safely return to the surface. This innovative safety system is not currently covered by any classing agency. > No other submersible currently utilizes real-time monitoring to monitor hull health during…
const int well_before_in_milliseconds = 50;
Re: Why isn't Titan classed? (2019)
#64Earlier quoted context omitted.
Wouldn't they have communicated that back if they had? There wasn't even an "Uh-oh", as far as we know.
James Cameron has been giving various interviews where he speculates they probably audibly heard the delamination occurring with enough time to cause them to drop the weights and try to abort based on what he's hearing from people in the know within the circle of deep sea explorers involved in the search and rescue. None of this validates using the audio sensor as a warning system because whether you have millisecond…
> [...]minutes warning prior to rapid decompression
Do you mean rapid compression (i e. implosion)? The internal pressure in such subs is kept at roughly 1 atmosphere at all depths. The massive pressure difference at depth is why hull integrity is of the utmost importance, if it's compromised, things go south rapidly.
Re: Why isn't Titan classed? (2019)
#65The truly scandalous thing here is this: > Depth Validating > As an interim step in the path to classification, we are working with a premier classing agency to validate Titan’s dive test plan. A licensed marine surveyor will witness a successful dive to 4000 meters, inspect the vessel before and after the dive, and provide a Statement of Fact attesting to the completion of the dive test plan. They clearly did not do…
> Simply lowering the thing to the ocean bottom uncrewed would have found this problem
It had made several trips to Titanic depth already. A more serious testing and classification probably would have prevented disaster but let’s not pretend this is trivial
Re: Why isn't Titan classed? (2019)
#66Patent for their hull monitoring system: https://patents.google.com/patent/US11119071B1/en
With the right waveform analysis algorithm you could monitor stress, cracks and the progress thereof. Get more warning.
It's true - for example, waveform analysis that detected the CEO saying "bringing an outside entity up to speed on every innovation before it is put into real-world testing is anathema to rapid innovation" could have raised warnings as much as four years before the fatal accident.
Re: Why isn't Titan classed? (2019)
#67The truly scandalous thing here is this: > Depth Validating > As an interim step in the path to classification, we are working with a premier classing agency to validate Titan’s dive test plan. A licensed marine surveyor will witness a successful dive to 4000 meters, inspect the vessel before and after the dive, and provide a Statement of Fact attesting to the completion of the dive test plan. They clearly did not do…
Found what problem? You realize they literally took this thing to the Titanic and back multiple times?
Re: Why isn't Titan classed? (2019)
#68The truly scandalous thing here is this: > Depth Validating > As an interim step in the path to classification, we are working with a premier classing agency to validate Titan’s dive test plan. A licensed marine surveyor will witness a successful dive to 4000 meters, inspect the vessel before and after the dive, and provide a Statement of Fact attesting to the completion of the dive test plan. They clearly did not do…
How would droppingb it to the bottom found the issue? The theory is that each dive reduced the integrity of the ship and eventually it would fail. Could be 10 or it could be 10,000 drops. And that number would be different if you built a second ship. How many tests do you do?
Re: Why isn't Titan classed? (2019)
#69I'm sure Ocean Gate is scrambling to NDA all employees, but at some point someone will speak up, and we'll get a better picture if the Titan was indeed routinely inspected for safety.
Re: Why isn't Titan classed? (2019)
#70It's not classed because nobody would have signed off on it with the level of testing they had done. Carbon fibre reinforced polymers don't have a defined fatigue limit, so stress cycle failure can't be ruled out, and it's difficult to estimate how much a design based around that material can endure. To get certified, OceanGate would have had to do destructive endurance testing on a replica hull, but they only proved it could survive a single dive! Their more serious competitors wouldn't dare take that risk.