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Hi Ashereng, I didn't shut off air reciever inlet valve. There are leaks upstream as well as down. You are right, there are I/P positioners with a constant bleed. However, I have identified them all (approx 10), and have attributed an scfm consumption to them. I appreciate the input/questions.

After pressuzing my air receiver to 120psi, I turned off the two air compressors and watched how quickly the receiver pressure dropped: - after ~0:35 (35 secs), pressure had dropped to 80psi; - after ~1:10, pressure had dropped to 60psi; - after ~2:20, pressure had dropped to 40psi. Note...

thank you, sir! [thumbsup]

Can no one help me with my queries above?

You're right, it's 4.5mm which is ~3/16" not 3/8" as I mistakenly noted.

You're a star, thanks again!

Hi Latexman, When you say x iterations, it leads me to believe that you created a spreadsheet for this calculation. Did you? If yes, would you mind sending it to me at lmjwalcott@caribsurf.com. I doublechecked the ID of the '1/4' hose. I found it to be approx 4.5mm (=~3/8"). If not, it's...

Sorry, but upon further consideration, I'm still a little confused here. How do you account for when the compressor is in off load and idle states? The rotor will still be making revolutions, but no compressed air is being delivered to load. Also, will the scfm delivered when demand is high...

You guys have been brilliant! I didn't realize how complicated a problem I was facing! I'm going to try to digest all the information which katmar has been so kind enough to type out. I do, however, feel I'm going to be needing to refer to a fluids book (as I doubt my mechanical colleagues...

vzeos, OK, gotcha. Unfortunately, we don't have rev counter. Is there any way to approximate the revs based on a log of the power consumption (taking readings x1/min)?

To Composite & MikeH: How I've described the air distribution to our elec panels is actually in place now - and has been so for years. My goal is to show them how much compressed air/energy/$ they're wasting, and to suggest a possible solution. Furthermore, the whole premise of creating a...

Latexman: For hoses discharging at 8psi: [a] size before and after regulator is 1/2" [b] length from regulator to 1st hose = 10' [c] to last hose = 10' + 15.25' = 25.25' - Number of hoses is actually 14 - Length of each hose is approx 2' - 1/2" pipe from regulator braches into two upon...

I'll check on those things for you, Latexman...

OK, sailoday, I'm confused on a few fronts. 1st, you lost me when you started talking about mach number, fl/d, critical flow area. I'm 'only' an electrical engineer [tongue]. 2nd, I'm not sure where you've got these control valves coming from. These air hoses are open to atmosphere. Each...

Thank you, vzeos. Your formula will prove useful. However, I don't believe that it totally answers my question. This will determine the scfd assuming the compressor is: [1] working at max air output 100% of the time, [2] has its servo set to the default (or rated) setting. I could be wrong...

Hi guys, Rotary vane compressor with 30kW rated motor. I measured the power consumption over a 24 hour period, and can therefore calculate the average kW consumed for that period. I also know the servo valve setting. The compressor is rated at 165cfm. How can I determine the average scfm...

I have 100psig in a 1/2" pipe which gets regulated down to 8psig. This pipe then has ten (10) 1/4" offshoot hoses exiting. The discharge is to atmosphere, yes. Same scenario for the hoses at 2psig. The source temperatures are unknown.

I have approx 15 hoses, all approx 1m in length. The exit pressure is 8psi for 10 of them, and 2psi for the others. Should I be considering them as short hoses and/or small losses?

This is the 1st thing that came up when I performed a Google search: http://www.globalspec.com/FeaturedProducts/Detail/ClippardInstrument/Hose_Tubing/12471/0?fromSpotlight=1

I'm trying to determine the flow rate for compressed air escaping to the atmosphere via an orifice of known diameter. Through my search of the web, I managed to come across this link... http://www.air-dispersion.com/msource.html It's exactly what I was looking for. With one exception. It...