Sub implosion: safety issues raised in 2018, whistleblower subsequently FIRED

[NOBLNG]

21 hours ago, iamsuperdan said:

What's a shark's favourite fast food?

Five Guys.

Yeah, i hear they are serving subs now.?

[iamsuperdan]

4 hours ago, stitchdup said:

mythbusters did a show tha showed what happened when a pressurised diving suit failed at 300ft, the entire body, bones and all were squashed into the helmet almost instantly, at 3800ft they are already spread over a wide area and feeding the fishies and plant life

 

They weren't friends at the start of the trip, but now they're quite chummy.

 

I'll show myself out now...

 

 

[redscampi]

13 hours ago, Raoul Ross said:

I mean, if there were no rules/laws/mandates, we'd all be falling *through* stairs, dying in elevators and being impaled by fancy knobs/levers/ et. al. that were the norm in 50s/60s cars. It's called "Statistics". They allow analysis of data that helps create laws/rules that keep everybody safe (well, at least as safe as stupidity allows)

I agree with this to a point. We've been mollycoddled and safetied ad nauseam  by our government. Even to the point of ridiculousness. A lot of that is brought on by our litigious society trying to second guess the next numbskull vying for the Darwin Award. Have you ever tried to pour gasoline out of one of the myriad stupidly designed "safety cans" without spilling it all over the place? Others may disagree, but I think there is a point at which regulations do hinder innovation, and even just living a normal life. This might be what Rush was trying to get at in his comments, but I think his choice to risk others lives to save a few bucks was criminally negligent. I can think of at least one industry that recently killed several hundred people by trying to avoid a lengthy certification process.

[OldTrucker]

2 hours ago, iamsuperdan said:

 

They weren't friends at the start of the trip, but now they're quite chummy.

 

I'll show myself out now...

 

 

That is so bad!LOL

[1972coronet]

They'd been better off stating with this gem !

[OldTrucker]

1 hour ago, 1972coronet said:

They'd been better off stating with this gem !

[Ace-Garageguy]

On 6/26/2023 at 8:44 PM, Rodent said:

So, while we constantly bash "endless rebleating", has anyone confirmed that photo is real, and if so, is that an actual structural part of the Titan submersible? Looks like a fake carbon fiber wall in someone's mom's basement or a bad photoshop to me.

Purported to be legit video of the submersible's interior, now widely available, do indeed show the frames the image in question was taken from.

 

[bobthehobbyguy]

Somehow it doesn't surprise me that something that incredibly stupid was done. I guess the logic was the hull was 13 cm thick so it wasn't a problem. Will be curious to see the failure analysis report has to say since they've recovered the wreckage. I think that there are going to be multiple problems found.

[redscampi]

1 hour ago, bobthehobbyguy said:

Somehow it doesn't surprise me that something that incredibly stupid was done. I guess the logic was the hull was 13 cm thick so it wasn't a problem. Will be curious to see the failure analysis report has to say since they've recovered the wreckage. I think that there are going to be multiple problems found.

My first thought was that the bond between the CF and the titanium might have failed. Will be interesting to see.

[Matt Bacon]

It’s been a good few years since I was (tangentially) involved in this space, but in the 90s, if you were filament winding a pressure vessel, the end caps were part of it, wound in one piece, with a clever collapsible “mandrel” on the inside that would be removed through the smallest possible hole you could leave and still get it out. I don’t recall any use case where you had a plain cylinder with full diameter hemisphere end caps bonded on, especially made of different materials…

best,

M.

[Ace-Garageguy]

On 6/29/2023 at 3:41 PM, Matt Bacon said:

It’s been a good few years since I was (tangentially) involved in this space, but in the 90s, if you were filament winding a pressure vessel, the end caps were part of it, wound in one piece, with a clever collapsible “mandrel” on the inside that would be removed through the smallest possible hole you could leave and still get it out. I don’t recall any use case where you had a plain cylinder with full diameter hemisphere end caps bonded on, especially made of different materials…

Good observations. Bonded-on caps wouldn't be desirable for an internally-pressurized vessel, in particular.

Pressure vessels are frequently wound over a metallic "liner" that forms the mandrel, which remains in place post-processing and becomes part of the structure.

And there's more than one way to wind...

When it's deemed necessary, one successful technique used for getting the mandrel out of a filament-wound structure is to make the mandrel out of styrofoam.

Once the resin has reached its first cure state, the mandrel is simply dissolved with acetone...prior to post-curing.

But there are so many apparent  (this definition: Appearing as such but not necessarily so; seeming) deficiencies in the design, apparently flawed analysis of structural loads and pressure distribution, and the apparent lack of any initial NDT, or what should have been mandatory NDT after every dive...well, the bonded on end-caps are just one of many issues possibly contributing to the failure of the hull.

Edited July 1, 2023 by Ace-Garageguy

[BlackSheep214]

On 6/27/2023 at 8:09 AM, NOBLNG said:

Yeah, i hear they are serving subs now.?

Oh dear... LOLOLOL 

[Ace-Garageguy]

 

[redscampi]

Thanks for posting that. Very informative.

[bobthehobbyguy]

Very informative. Given all the flaws i find it amazing the submersible didn't fail sooner given all the issues.

[SSNJim]

The US Coast Guard recovered some wreckage and released some findings this week Below is a link that has a little more info. Reader's Digest Condensed Version: the laminate debonded. Unfortunately, there's no link to any USCG or government documents, but some might find it interesting. I did find a 20 minute NTSB hearing video on the page.

 The Ship Model Forum • View topic - Submarine Titan implosion : NTSB report: (shipmodels.info)

Edited September 27, 2024 by SSNJim

[Bugatti Fan]

This has been a very interesting thread to read (apart from the sick jokes about what happened to the people who died in that submersible).