A short trigger event resulting in voltage and current oscillation sounds like inertia may have been too low to stabilize the system.
Possibly the trigger event excited some resonance in the bulk power system.
Admitted the current evidence is thin and essentially hearsay.
Yahoo News
April 29...
Quote from FIU webpage Link
I would not read this to say that the pylons and cables provide much if any additional capacity to the bridge deck. The geometry does not appear to support the pylon handling that much bending force.
The arrangement should redundantly support the pylons and cables.
Bangkok’s Collapse Scandal: Fake Steel, Chinese Builders, and a $60M Disaster
China Spotlight
Per this, there are all sorts of engineering, material, and administrative misdeeds.
The construction (generic picture below) if correct is a type I expect is more sensitive to construction details and...
It may be desirable to adjust the steam admission nozzle size, or reduce the number of active nozzles to match the load. This is another thing to consult with the turbine manufacturer.
Link to USGS shake map https://earthquake.usgs.gov/earthquakes/eventpage/us7000pn9s/shakemap/intensity
Bangkok ground shaking was nowhere near as intense as near the fault.
7.7 magnitude earthquake, building under construction. Many under construction buildings will not meet design case load capacity, and this was a strong shaking. Many other buildings / structures damaged. This is clearly a tragedy.
Building collapses in Bangkok after powerful earthquakes...
I suspect that after the track is in place, it will have a much slower speed limit than previously, until it is machine tamped several times
Tamping Machine Wikipedia
and then measured with a geometry car.
The better the track geometry the faster the allowed maximum speed limit. Other things...
The Key Bridge Collapse NTSB after action findings start to arrive, as we suspected there are a number of bridges at risk of ship strikes.
March 18, 2025 NTSB Report MIR-25-10 Safeguarding Bridges from Vessel Strikes:Need for Vulnerability Assessment and Risk Reduction Strategies
With...
Some video
I-10 Bridge Collision in New Mexico
Casey Jones -
Per NM Vdot span will be contracted for replacement soon. Entire bridge was already scheduled for reconstruction in 2027
Skydrol™ = aviation phosphate ester.
I have some experience with a different phosphate ester, it is seriously difficult to ignite, I doubt that was the cause of the fire. My bet is on a fuel leak.
Dominion Power places arrastors on underbuilt distribution
Application of Station Class Arresters on Underbuilt Distribution Lines; INMR, July 19, 2024 indicates 2 km spacing of station class arrestors is effective in protecting underbuilt distribution from the top higher voltage layer. The...
Trying to use undervoltage ride through to keep a positive displacement pump working seems too risky (as pointed out above). If you really want to try this construct an experiment, to prove the concept works.
Solutions that place a UPS in the motor starter(s) feeder, and solutions that place...
The preliminary NTSB report is out
News Release
Reports
AIR-25-01
Investigations
DCA25MA108
This illustration clearly explains why the recommendation is to prohibit helicopter flights when the runways are in operation.
This looks like composite concrete with the girder being a bulb T.
If this was a job handed to me I would (as the previous responders indicate)
Close access to the public as the walkway cant be safe for pedestrians.
Start a hunt for a structural engineer specializing in concrete structure...
I would handle this the same as boiler blowdown. The minimum volume of the receiving blowdown vessel is approx 3x of the blowdown volume. Then the liquid needs to be drained before the next blowdown. If you use an open top tank expect some liquid to splash out the top, depending on how the...
Enlarging the picture posted by the OP, I see a fatigue crack (more resolution would be helpful), but no weld.
Do these hangers get any periodic NDE? A dye penetrent test would find this. A visual inspection might not.
I was unfamiliar with the abbreviations, so I looked them up.
Opinion - Both of these products look like they have a place in power distribution. The OP's position that the choice needs to consider the features of both products, including the need for any specialized training and tooling, is...
