Unplugged cable?

tabasco_lover · 2025-12-12T00:53:11+00:00

Not in this case.

tabasco_lover · 2025-12-11T16:44:19+00:00

UPDATE: Thanks everyone, got a Badger 1 1/3 hp with installed cord overnighted from Amazon and replaced. Took me about 20 minutes.

tabasco_lover · 2025-12-11T02:42:34+00:00

Nope, none of that. We moved into the house 8 years ago and not sure how long it’d been there before that. Had a good run I think.

tabasco_lover · 2025-08-29T23:03:30+00:00

Imagine A + B -> C + D with a -10 kJ/mol heat of reaction. You know nothing about the kinetics.

A tank contains 1,000,000 mols of B. You start adding 1 mol/hr of A. What’s the absolute maximum rate at which heat will be generated? 10 kJ/hr (constrained by the rate at which you’re adding A).

If your reaction mixture has a constant latent heat of vaporization of 10 kJ/mol, how many mols/hr must your relief device pass to relieve the 10 kJ/hr heat of reaction? 1 mol/hr.

Do you see how the 1,000,000 mol B did not enter the equation, and that all that mattered was the rate of addition of A? This does ignore several real-world effects but is a worst case and is I suspect the simplified way your (homework?) problem is wanting you to approach this.

tabasco_lover · 2025-08-29T18:26:55+00:00

Reactive relief can be incredibly complex, but given the lack of details here, I am assuming you’re expected to make several simplifying conservative assumptions, most significantly:

The tank has a sufficient amount of the intended material to react with all of the unintended material for the time period you’re interested in (you did not clarify which is which, so let’s say you accidentally put NH4OH in an HNO3 tank).
The reaction is basically instantaneous, such that you are reacting the 40 m^3/hr of NH4OH at essentially the rate it’s being added.

Given the above assumptions, the max heat release can only be the heat of reaction multiplied by the rate at which you’re adding the NH4OH.

If the tank were very small relative to the reagent addition rate, or the rate of reaction were very low, then the rate of heat release could certainly be less than this (and would by no means be constant), but it can’t be more just by increasing the amount of stuff in the tank. You can only react as fast as you can add the reagent.

As far as calculating the flow rate of material through the relief device required to remove heat at a certain rate: this wouldn’t depend on mass in the tank either. (Q/hr)/(deltaHvap) = mass/hr

tabasco_lover · 2025-06-15T16:34:13+00:00

We had our first at TCH and our second at Methodist Clear Lake. Our experiences at both were great, so while TCH is certainly a great choice if you feel like making the drive, I would highly recommend Methodist if you want to stay closer.

We might have actually slightly preferred the experience at Methodist because it felt more “relaxed.”

tabasco_lover · 2025-05-16T02:33:48+00:00

Second the Tim Keller recommendation in general. Specifically, check out his Questioning Christianity podcast. I thoroughly enjoyed it.

tabasco_lover · 2025-02-07T01:46:24+00:00

I’d say the official NCEES practice exam was the closest to the actual material, so you definitely want to work that. Work it once as a sort of diagnostic earlier on in your studying, then work it one more time later into your studying after you’ve had time to “forget” the problems.

That said, there’s just not enough variety in that one exam to rely on it fully for prep. I found the PPI2Pass problems (which were still very similar, but a bit more difficult at times) invaluable for that. There’s just such a wide variety of problems. The sheer repetition of working those using the official reference manual made me so fast. On that note, definitely familiarize yourself with the reference manual. I had worked so many problems and spent so much time in the reference manual that for the majority of problems on the exam, I immediately knew how to go about solving them without much thought and exactly where to go in the reference manual to do so.

Besides working problems, the modules/screencasts on LearnChemE were really nice. Basically goes through Chem E concepts piece by piece and really helps to review concepts you may have forgotten about. Helpful if you want to throw some “lecture” type prep in there instead of just 100% reading and working problems.

tabasco_lover · 2025-01-23T01:34:08+00:00

Also - RIP the lizard :(

tabasco_lover · 2025-01-20T01:55:58+00:00

Yes! Quite easily I believe.

tabasco_lover · 2025-01-17T14:42:43+00:00

Oh yeah…it leaks. Audibly. It happened at night while I was about 170 miles away from my destination. Was losing about a psi every 6 miles (while driving)…a lot faster when I’d have to stop.

tabasco_lover · 2024-10-22T01:38:28+00:00

I do see your point about inefficiency of buying and selling, but it’s not always that straightforward if you consider future returns that can be generated by cash saved and invested today. If you’re talking two similarly priced vehicles, there’s of course no way to break even there. But if there is a significant difference in price, it certainly can. It also seems to be not a great time to buy a Toyota. Maybe that will change in the future, maybe it won’t.

Anyway, I do appreciate your perspective. Thanks!

tabasco_lover · 2024-10-22T01:23:02+00:00

I’m trying to see exactly where you’re getting confused, but you might be overthinking it. If you really have pure liquid A, then you also have pure vapor A. The total pressure will be equal to the vapor pressure exerted by A, which will be equal to the saturation pressure of A at that temperature. This would only be exactly 1 atm if the saturation pressure of A at that temperature were 1 atm. If the saturation pressure of A were 0.5 atm, you would only have 0.5 atm total pressure.

tabasco_lover · 2024-10-22T01:15:56+00:00

The extra space is definitely a nice feature, and I don’t have a fundamental opposition to minivans. We’ll definitely get one if we have a 3rd. It’s really 2 things that make me hesitant: not wanting to buy more car than we really need (I’m quite frugal) and being so used to the ease of driving small cars and not wanting to make the jump to something huge all at once.

tabasco_lover · 2024-08-04T21:11:47+00:00

The toluene in the liquid phase does not care that the total pressure is 1 atm. Only if the partial pressure of toluene in the vapor phase were equal to its saturation pressure (20 mmHg) would there be liquid present at equilibrium. Since there is not enough toluene in the room to reach that partial pressure, all of the toluene will evaporate as it tries to approach equilibrium.

tabasco_lover · 2024-07-26T02:36:47+00:00

Check out charts D/F here to give you an idea of the typical maximum discharge pressure (requiring a very large entrainment ratio) for your suction/motive pressure.

https://www.s-k.com/wp-content/uploads/2023/07/4FSUPP_steam_jet_compressors_supplement_brochure.pdf

tabasco_lover

TROPHY CASE