If you care to become a survey nerd, the National Geodetic Survey has a webanar series that often addresses high precision uses of the Global Positioning System. For example this months offering GPS Campaign Surveys for Estimating Vertical Land Motion to Inform Coastal Management (the video...
Manhattan is seismic, https://www.eng-tips.com/threads/nyc-earthquake.518017/
https://apnews.com/article/east-coast-earthquake-7d03f7a44a6c1a1ea877820515808bee
See attached asce 7 report.
Cataloged circuit breaker (AC and DC) interrupting ratings need to be respected, changing trip curve time constants does not change the interrupting rating.
IE if the circuit breaker is rated at 120V and 50,000A interrupting capacity, exceeding the interrupting rating can result in the breaker...
The slopes you describe are flat enough that given that the curve of the earth surface is about 1 foot per mile, if your ditches have significant length you will need to set grade stakes using geodetic leveling.
For work like this it is beneficial to the project if a licensed surveyor sets the...
Seems like applying a MPCB to a heater circuit would be a misapplication, in the NEC world the correct device would be a Circuit breaker with ground fault (30mA?) trip.
Please provide a snapshot of the device label.
Do you have an estimate of the available fault current?
As often stated by...
I think the above deal with most of the questions the OP presented, so the following might be a bit of a rabbit trail.
Wikipedia Link - Permanent magnet synchronous generator (PMSG)
A PMSG can only work as a constant voltage source when the system it connects to has sufficient size to provide...
At zero torque load, slip is nearly identical for all rotor resistance selections.
As the torque load increases, the impact of increasing resistance on motor speed becomes large.
figure from http://www.allaboutcircuits.com/textbook/alternating-current/chpt-13/wound-rotor-induction-motors/
Your model is not too far from reality. Overpressurization often results in fishmouth failures. The comments above about end connection constraints while valid can be ignored if your purpose is to experiment with the software to see what kind of failures occur with different constraints.
This...
How do you rebuild a railroad?
PART 1: CSX is Rebuilding the Clinchfield ~ THE DESTRUCTION THEY WILL FACE 11/6/2024
PART 2: Rebuilding the Clinchfield ~ BIG TOYS 11/14/2024
Step 1 Big Machines - build a road.
Step 2 Bigger machines - build a railroad
Lots of seat of the pants engineering to get...
FEMA FIRM's generally assume floods are defined by a free pond elevation. For debris flow, the flow energy makes the free pond elevation almost not relevant. The linked video includes examples in the field of both the trigger areas, and some locations where the flow overshot the pond elevation...
Setting camber in walkway like this can be done by blocking the lower cord to the desired shape before welding in the diagonal members. For a structure like this camber is mostly cosmetic ie it does not change the member stresses.
All of the questions regarding correct engineering calculations...
My choice for this sort of application is a duckbill valve (like the red valve tideflex). These valves are very tolerant of trash, and can be installed horizontally. If you need more backpressure and can tolerate "active control" a pinch valve will handle ground up sewage solids.
When I was actively estimating, I used a combination of RSMean's, Richarson's, and historical data adjusted by one of the St Louis FED industrial construction producer price index. Richardson's has an industrial focused cost data product.
The rub rails appear to be unstiffened aluminum sheet, This is going to provide a negligible additional amount of load capacity, as any significant compression will cause it to buckle.
To answer your question you either need to measure the OD/ID, if not cut, guess at the ID, or dig up enough pipe to see the markings.
https://www.plasticpipe.org/PPI-Hom...ications/Download-HDPE-Handbook-Chapters.aspx, CH 5
If you are trying to find fittings, you can select a mechanical...
I-40 Repair in North Carolina and Tennessee Progress Report, Casey Jones - Professional (Oct 30 2024)
These coal miners build roads like combat engineers.
‘West Virginia Boys’ move a literal mountain to build a road so Helene victims can finally return home: ‘Nothing short of miraculous’ By...
Bootstraping, works faster than FEMA.
Asheville is Worse than We Realized - Can They Rebuild? Project Atticus
Solar power requires sun. It could be a partial solution, but I doubt there are many locations in the deep hollows with enough sun time to make the economics work. Bringing in solar...
1. All good deareators are counterflow. First steam must heat the drops, inward flow of condensing steam will prevent difusion of non condensibles. Once the drop is heated to steam temperature, noncondensible gas can difuse out of the drops. Smaller drops have less distance for the gas to...
