Immediately before the failure, the majority of power on the grid was inverter sourced, not rotating. I have heard talk of motorizing retired generator units in order to improve inertia of heavily solar/battery supplied grids.
One supplier of ours that uses John Deere engines has strict back pressure limits on the fuel returns. We have to run checks because we have multiple engines sharing common returns.
I haven't heard about this incident. The writing of the article is very strange and doesn't explain the situation well. This article does a little better but both have similar references so there must be a parent pre-AI article somewhere...
As an operator of propellers, its obvious by watching the wash of a propeller that the concept of a tidal generator is totally absurd. The wash rapidly expands and fans out due to turbulence in the fast moving water. Trying to reverse that process and convert a small cross section area of that...
If there was corrosion due to water I would expect pitting on surfaces. The report makes no mention of that and oddly ommitted all images of the parts that actually failed.
I have an issue with that report on the freewheel gear. They found corrosion products in the freewheel mechanism and assumed it was due to water intrusion despite no actual water being present and no sources of ingress found. Did the investigators not know of fretting corrosion? That will occur...
A typical self-priming centrifugal pump will lose prime and stop pumping before it pumps all the water out of its casing. It will continue to self-prime until water is available to pump again. It will self-prime as long as there are no checked valves on the discharge side of the pump. You may...
With that language I believe you are not a fan of plug welded wallpaper? I've plug welded corrosion resistant cladding to brake drums but wouldn't do it again today knowing what I know today.
Greg, it appears there is very little structure to withstand w moment about 11 and 12. The mast does appear bent in the photos. If it bent while the rotor was perpendicular to that skid unit that could create quite the moment.
However, the structure that we see still attached to the...
Engineering papers typically have an abstract so that readers can quickly identify relevance to their inquiry. Can we please require that posted videos have some type of abstract so we don't have to wait 22 minutes to find that nothing interesting has been discussed?
I think the most notable detail is that the top deck of the helicopter separated from the frame with the rotor and transmission attached. How is the deck secured to the helicopter frame?
Do you have any requirements for how long this needs to run at power? You should start there. If this is an emergency generator it may be required to meet an equivalent to US EPA Tier 3. These engines often have significantly higher BSFC numbers than any other rating.
