Recent content by Dullard

The table appended to post 17 is probably correct, but it may leave a reader with the wrong impression. Helium is difficult to contain. Helium is a small molecule - That's more about the mass than the diameter. At a given temperature, a smaller molecule moves at a higher velocity (MV^2). It...

As I understand it: For the purposes of your question, water vapor (no condensation, no evaporation) is sufficiently close to ideal.

I'll stand by my post; The 'amount of water' and 'vapor pressure' are not the same thing. Your last paragraph is correct (and is exactly what I was trying to convey), so I think we agree.

Possibly noteworthy: The water content of compressed air is typically 'saturated.' This can be misleading. The vapor pressure of water is a function of temperature (only). A tank of 120 PSIG compressed air has as much water (per unit volume) as a tank of 60 PSIG compressed air (equilibrium...

I don't know the details of the VFD that you're considering, but: Reducing the output frequency would be (approximately) the torque equivalent of option #2 (gear down). Worth a shot, I think.

If I were using a winch with a guillotine device on the cable, I'd want to be absolutely, positively certain that the device had not been "pecking" at my cable (damaging but not severing it). This arrangement makes operation an all-or-nothing event.

Military aircraft (back when I worked on them, anyway) use 400 Hz for precisely the reasons described in post #2. Size and weight are dominant considerations in that application.

Evaluation of the boiling point of a target solution (compared to a theoretical 'pure' salt solution) may give some insight into the magnitude of the effect of the anti-caking agents. FWIW: My experience with humidity sensors suggests that the accuracy claims can be misleading. Most have...

Not precisely responsive, but may be useful to sanity-check results: The theoretical maximum water production rate is approx 5.6 Kg/Hr per Ton of refrigeration. That's a fairly expensive way to produce water...

I have successfully used the combination of a step-ladder, an extension ladder, and the house roof to 'bridge' that kind of porch roof. Have a trustworthy person brace the step-ladder.

You didn't say what you're doing with the furnace. If you just want to 'backfill' the furnace with Argon, your setup will work. Gas won't flow from low pressure (furnace) to high pressure (bottle). The furnaces that I've been involved with weren't as simple as just 'backfill' - they required a...

You got it.

I'm wondering what 'high-tech' means. I agree that Engineering involves a lot of approximation, but that's a feature - not a bug. Engineering (Design) is about optimizing on specific axes. It might be cost, weight, energy consumption, temperature range, etc., or some combination of those...

I agree with most of what's been posted - I haven't seen any mention of: One good reason to use a Woodruff key is as a "mechanical fuse." They may be sized (and of proper material) so that they fail before anything else. That approach obviously requires some room between the 'running' and...

You absolutely need to have enough amperage (capacity). The capacity of your panel is well-defined. Your 'required' capacity is less so. There are a number of different sizing methods which (ultimately) take advantage of the fact that everything won't be on at full capacity all at once. Note...