I'm not an electrical engineer. Recently I learned that gas powered cogeneration plants (common on wastewater treatment sites) are poor replacement for a Diesel engine for an emergency power supply, and about another problem:
Frequency inverters produce high frequency signals on the side of the...
https://fortune.com/2022/06/10/elon-musk-tesla-nhtsa-investigation-traffic-safety-autonomous-fsd-fatal-probe/
"On Thursday, NHTSA said it had discovered in 16 separate instances when this occurred that Autopilot “aborted vehicle control less than one second prior to the first impact,”...
The manufacturer of rabble rakes for static primary sludge thickeners has concerns that the rake might get stuck if it's not moving for a longer time (ay power failure). How likely is this actually? How thick does primary sludge get, when thickened statically?
The circular thickeners in...
This week a residential building in Essen, Germany, caught fire:
https://www.dw.com/en/germany-fire-rips-through-apartment-complex-in-essen/a-60852478
3 lightly injured, ~100 residents made it out unharmed.
Fire broke out on a balcony, spread over whole facade
The building was from 2016 or...
I'm talking about pipe couplings like this:
My concern is the gap between the pipe ends - 5m at small diameters, 5-10 at larger (starting at 57 mm). The general wisdom is that gabs and cracks in pipelines are at risk of corrosion. I'm concerend about this 5mm gap (not the coupling). As far as...
There's decent formulas and rules of the thumb about for using 90° bends to absorb thermal expansion in pipelines.
How to account for this shape:
The pipeline follows the parapet on the top of a series of vessels.
the pipe is stainless steel, DN 250, to the left it's ~7m to a fixed point...
I have a hunch: Until a few decades ago, engineers would do their design, then in many cases the foremen or other skilled crafts persons on the shop floor would figure out what jigs to build etc. to manufacture something efficiently. Anecdotally this is confirmed by stories from one of my...
We will need expansion joints, to account for thermal expansion, in a pipeline DN150 carrying sewage sludge (between digester and HX).
Looking at different expansion joints, I prefer rubber ones like these: https://elaflex.de/en/products-catalogue/section-4-rubber-expansion-joints#H*file~1562...
In a current project we will have high points in sludge pipelines from the anaerobic digester to the sludge HX. There's the question on how to get residual gas from these high points. There's space where we can safely vent this gas, the question is how to get the gas from the pipeline
How much...
I hope this is the right forum for this question!
https://blogs.sciencemag.org/pipeline/archives/2021/02/02/myths-of-vaccine-manufacturing
Apparently, in the production of mRNA vaccines the microfluidic components play a major part in encapsulating the mRNA in a stable lipid coat (the...
https://www.click2houston.com/news/local/2021/04/18/2-men-dead-after-fiery-tesla-crash-in-spring-officials-say/
“no one was driving” the fully-electric 2019 Tesla when the accident happened. There was a person in the passenger seat of the front of the car and in the rear passenger seat of the...
An anaerobic digester for PS and WAS in a WWTP, air-lift with sewage gas injection below the draft tube - are there better sparger designs than just an open pipe end?
AFAIK air lift pumps are more efficient with smaller bubble sizes (to a point the higher pressure loss is offset by better...
This is a picture from the DIN ISO 62424 (equivalent to the IEC 62424):
Now it would be really cool to be able to draw something like this, then export the data in way that you can copy into your control narrative (for each hexagon/control task), to add a bit of text and setpoints so the...
At a wwtp, we will be installing a new cogeneration plant and adsorption chiller. Because adsorption chillers don't com in abritrary sizes, we may have 10 or 20 extra kW cooling power (in the form of cold water, ~ 5°C/15°C).
Now the plant operator has the idea to cool the air inflow into the...
Beyond the specific codes etc. I work with in my field, what are essential readings on the above?
I'm interested in the social aspects as well as in how to systematically think about the technical aspects. Reports of investigations into specific accidents may also be interesting.
My own field...
This is the situation:
For clarity, this is a P&ID sketch of part of the same manifold:
I don't understand the position of the three way mixer, as this would mix hot water into the return and serves no function to control the heat of the flow to the HX - it could limit flow to the HX but...
I need air for two applications.
Application one is flushing filters:
~ 500 Nl/min
4 bar,
dew point +3°C
The other is operating small valves and the like:
~ 3 or 4 Nl/min
6.5 bar
dew point -20°C
Both need quality class 1 re. particulates and oil. Since the client does not want to deal with...
Three submersible pipes in paralell will feed a pipeline, lifting wastewater by about 7m and feeing into a tank (near the bottom). Sveveral instruments will be installed along the pipe, including a static mixer, flow meter, etc. I think it would be a good idea to be able to empty the pipe.
The...
"Forward osmosis (FO) is an osmotic process that, like reverse osmosis (RO), uses a semi-permeable membrane to effect separation of water from dissolved solutes. The driving force for this separation is an osmotic pressure gradient, such that a "draw" solution of high concentration (relative to...
I have two problems: I find it hard to make realisitc estimates how long something wil take me and I find it difficult to be productive when juggling several projects.
I'm consultant engineer. Typically I have one or two construction sites and one project in a planning/design phase...
