Recent content by Dullard

The Helium flow through a 1.5m length of 9mm I.D. tubing with the described pressure conditions will be significantly (several orders) higher than 15 LPM. I'm not sure if this is an 'actual' situation or a 'thought experiment,' but the flow is being (mostly) limited by something other than the...

To be fair, an individual's perception of the report probably boils down to a single question: Is evidence required to justify treatment, or to prohibit it? The report does have a 'justify' bias (for those who consider that a 'bias.')

Draw a dotted line (wherever you like) around the system. Don't move the line halfway through the analysis.

One could (were one bored enough) argue for a long time about an objective evaluation of subjective data. The Cass review appears to (correctly, IMO) do little more than point out that there isn't enough reliable data to have much of a conversation.

My Grandfather use to say "If it works, don't F@!%$ with it." This is one of those situations. Grandpa never worked on spacecraft.

Good Luck. It will make perfect sense (once you figure it out).

The 2 leading possibilities: 1. A cable defect (marginal) between the Tstat and the AC 2. An intermittent defect at the main contactor coil. I've seen both (standing in my backyard at 2:00 AM in my underwear). While not always the case, these kind of intermittent AC issuers are often related...

I can think of no reason (theoretically) that you couldn't use O-rings in a static application with the 'gentled' rectangle that you describe. The issue is: Any 'differences' along the O-ring (from the POV of the O-ring) in terms of groove geometry or clearance with the mating surface will...

I'm not going to do the experiment. Assuming nothing exotic about the water supply, best flow will be accomplished with the hose just above/at present water level. As you've already noted, there is no static pressure advantage to submerging the hose and the exit back-pressure (dynamic) will...

Sadly, you can't generally assume whether a generic 'percentage' is volume, mass, or whatever. Units matter. I use '%wt' and %vol' to prevent confusion (and collisions with Mars).

"Same Voltages" is the tricky part of this question. If your single-phase supply is 120 VAC (L-N) and your 3-Phase supply is 120 VAC (L-N) [A.K.A. '208'], then the answer is 'yes.' 120*I : 3*120*I = 208*sqrt(3)*I.

You're describing 'static friction.' There is no fluid equivalent.

I agree with Rive. I would add: Precision is cheap - accuracy is expensive. This thing is probably OK as a gross detector. If it shows 'some' CO, I wouldn't assume that the number on the display is particularly close to the actual concentration.

There are a couple of reasonable possibilities - neither of which involves the magnets: 1. The kind of sensor typically used in a hand-held battery-operated CO sensor is a high-impedance device. There will be signal conditioning/processing hardware, but the fundamental sensor is susceptible to...

Referring to your original question: Get a smarter colleague (you're right).