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re: Francis Scott Key Bridge in Baltimore has collapsed - container ship wrecked into it
Posted on 3/27/24 at 9:42 am to baldona
Posted on 3/27/24 at 9:42 am to baldona
quote:
Seemingly if it just lost power and turned the motor into neutral, why would it have not just continued on straight under the bridge?
Current, wind.
1
Posted on 3/27/24 at 9:44 am to WeeWee
quote:
Is it really going to take months to clean up the wreckage enough to reopen the harbor? How long does it take recover the bodies of victims and then put enough explosives on the wreckage to make it sink in tiny pieces?
I think there is more to this than that. The victim piece is the easiest. They're going to need massive cranes to be brought in which don't ship overnight from Amazon. They have to survey for likely a couple of weeks before even getting started, etc.
Posted on 3/27/24 at 9:48 am to prplhze2000
prplhze2000
Francis Scott Key Bridge in Baltimore has collapsed - container ship wrecked into it
How would you know? Settlement was sealed.
You talking to me? Close association with the barrel racer who went into the river with her dually and a trailer full of horses.
Francis Scott Key Bridge in Baltimore has collapsed - container ship wrecked into it
How would you know? Settlement was sealed.
You talking to me? Close association with the barrel racer who went into the river with her dually and a trailer full of horses.
Posted on 3/27/24 at 9:59 am to baldona
No, the main doesn't power anything but the wheel. It also didn't shut down. You could never restart that engine in that time frame. It lost rudder control when it went dark.
The hydraulic pumps for the steering are usually electric.
No. It's a single screw on a blacked out ship. The slower you go, the less the rudder will work.
The hydraulic pumps for the steering are usually electric.
quote:
could you not steer the boat with a reversed prop in the proper direction?
No. It's a single screw on a blacked out ship. The slower you go, the less the rudder will work.
Posted on 3/27/24 at 10:00 am to BrotherEsau
Rudder position probably wasn't centered either.
Posted on 3/27/24 at 10:14 am to SPEEDY
Posted on 3/27/24 at 10:27 am to SPEEDY
The target bridge lifespan in current national guidelines is 75 years
We aren't far off from needing multiple bridge replacements in Louisiana
We aren't far off from needing multiple bridge replacements in Louisiana
Posted on 3/27/24 at 10:37 am to baldona
quote:
If that’s the case though, could you not steer the boat with a reversed prop in the proper direction?
It was likely the cavitation and counter rotation that caused the veer towards the stanchion. Dragging the anchor likely exasperated the veer
Posted on 3/27/24 at 10:39 am to nicholastiger
Make no mistake. IF they do bridge work in Louisiana, they will do it all at once to cause even more issues.
Posted on 3/27/24 at 10:41 am to baldona
quote:
Its odd to me as a laymen the ship basically veered starboard only. There wasn't any noticeable back and forth at all?
Understandable and explained well in the two video links posted earlier in this thread. If you wish to really get in the weeds, check out G Captain, a blog / forum started perhaps ten or more years ago IIRC by a former U.S. Navy officer and subsequent civilian mariner. Lots of Gulf of Mexico marine industry content as well as other geographic areas.
G Captain
There, you'll learn such esoteric things such as the admiralty law term for a vessel collision with a stationary object, called allision. Their Dali thread is as speculative as ours, but informed by maritime professionals.
It appears as if Dali lost mains power twice in the span of 70 or so seconds, not far from the Key bridge. Why is a question to be answered, helped greatly by the pending recovery of an intact engine room.
It will not be difficult to discover the root cause of the mains blackout failure. My guess is the vessel's chief engineer already knows.
Posted on 3/27/24 at 10:43 am to DownshiftAndFloorIt
quote:
No, the main doesn't power anything but the wheel. It also didn't shut down. You could never restart that engine in that time frame. It lost rudder control when it went dark.
The hydraulic pumps for the steering are usually electric.
Its also possible the main shut down and never restarted. I don't think its been released what issues they had?
The main down but with forward momentum already and lost rudder with a slight starboard turn could have caused this right?
Posted on 3/27/24 at 10:43 am to nicholastiger
quote:
The target bridge lifespan in current national guidelines is 75 years
We aren't far off from needing multiple bridge replacements in Louisiana
Don't start looking at bridges nationwide. We have a serious problem with bridges going to shite, and it only gets worse as time goes on. 50,000 have been deemed "structurally deficient". This is why I laugh at people who are proponents for commuter rail in the US and the billions of dollars it will cost. Fix the shite that is already falling down around our ears before you start talking about that shite.
Posted on 3/27/24 at 10:49 am to Mr Breeze
quote:
It will not be difficult to discover the root cause of the mains blackout failure. My guess is the vessel's chief engineer already knows.
I maybe misunderstanding the term mains, but main to me would be the main engine that runs the screw.
My understanding is that the main engine does not also run the electricals that control the rudder?
Posted on 3/27/24 at 10:49 am to baldona
quote:
Seemingly if it just lost power and turned the motor into neutral, why would it have not just continued on straight under the bridge?
Current - the event occurred on a full moon, which creates large variances in high/low tide
Posted on 3/27/24 at 10:50 am to BourreTheDog
quote:
Current - the event occurred on a full moon, which creates large variances in high/low tide
Is that a fact? A stuck rudder with forward momentum seems more likely to me.
If there was current to starboard, the rudder should have been pointing to port to counter act it?
Posted on 3/27/24 at 10:57 am to LegendInMyMind
quote:
Don't start looking at bridges nationwide. We have a serious problem with bridges going to shite, and it only gets worse as time goes on. 50,000 have been deemed "structurally deficient".
The American Society of Civil Engineers has been beating this drum for quite some time.
Severe bridge foundation hydrodynamic scouring, like the one over the Jordan River on I-10 near Diamond Head, MS is but one example. Thankfully, I rarely cross that bridge nowadays.
How the I-10 Lake Chuck bridge is still upright is a mystery.
Posted on 3/27/24 at 11:16 am to baldona
quote:
I maybe misunderstanding the term mains, but main to me would be the main engine that runs the screw.
My understanding is that the main engine does not also run the electricals that control the rudder?
Mains, yes the very large propulsive engine. Rudder hydraulics may run off a shaft generator or a dedicated separate one. I'm not familiar with this particular Maersk vessel cookie cutter design, and am purely speculating.
Search for the MV Dali "Failure Modes and Effects Analysis" a.k.a. FMEA and that document might pop up. It will answer most of the questions you pose. The vessel is classed in Japan, who are very good about documenting things.
Posted on 3/27/24 at 11:23 am to Mr Breeze
quote:
How the I-10 Lake Chuck bridge is still upright is a mystery.
I’ve been hearing about how bad this one is for a long time. If that one goes down, it’s going to be a cluster frick
Posted on 3/27/24 at 11:41 am to LegendInMyMind
quote:
This is why I laugh at people who are proponents for commuter rail in the US and the billions of dollars it will cost. Fix the shite that is already falling down around our ears before you start talking about that shite.
Get rid of highway widenings and new roads first, since those use the same federal funding that bridge replacements do.
Posted on 3/27/24 at 12:20 pm to Wally Sparks
quote:
Get rid of highway widenings and new roads first, since those use the same federal funding that bridge replacements do.
Or maybe stop sending billions to Ukraine and Iran and funding gender programs in Pakistan paying billions to illegals, and fix our shite at home instead.
frick the rest
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