Nitrogen AND a compressor

[Chickenthief]

I have replied to a similar thread on another board and my reply here is the same: Introduce a large (several gallons) plenum ie. in/out tank on the in-side of the compressor and keep that at +3-5psi. That way the compressor can gulb up what it needs and never starve or worse get choked on excess N2 from the regulator.

If you rely on micro bore hoses to aid in regulation you're doing it wrong! You need to regulate pressure not flow to do it properly.

As the YH rises in presure built it will also rise in backpressure (residue pressure in the cylinders) and fed pressure will rise and cause havoc.

If you doubt me then clock the YH going from 0-1000, then from 3000-4000. Difference in time right? That is partially/mainly due to pressurised air allready in the cylinder and the lack of a full filling from the pre-stage cylinder. At first it gulbs up close to 100% volume then as pressure rises the recidual air from the previous stroke will occupy some of the cylinder volume and filling will lower.



No pixie dust just psysics (unfortunatly).

 

[Guest]

So I was thinking about the moisture boogeyman. I don't see how he can exist when a tank is being topped off from 3000 PSI or above. I have a check valve which effectively acts as a PMV meaning no air flows into my tank until the compressor pressure is greater than the tank pressure.

The same holds true for folks who do the tank mating dance I suspect.

So maybe the moisture boogeyman just gets summoned when filling from empty, which is a one-time event for most people?

 

[bubblerboy64]

A several gallon plenum would get complicated or so it would seem to me. I understand the necessity to have the correct pressure but my system is not completely sealed so I've got a little flexibility I believe. This is a " make me feel better" project and from the beginning it has been of questionable merit. My N2 tank is getting lower and when I replace the tank I may do this an entirely different way. Fill the tank to 275 bar with the compressor and then the rest of the way with the n2. That would stretch the N2 further. Then when the N2 tank gets down do what I have been doing.

As to the moisture. I really have no educated information to provide. I will say this doing what I'm doing I get very little condensation out of the drain on the daystate compressor.

One more thing. That N2 coming out of the N2 tank is cold and it would seem that might be an advantage as well to the compressor. I monitor the situation carefully. I sit with the unit as it's running and I'm checking for any unusual sounds and I check the flow from the N2 tank and see that it's getting plenty of air. Not too much either.

This is not something that I'd advise others to do and I may not continue. Just something of interest. For some reason I find buying a 6000 PSI n2 tank and turning it back with 2500 PSI still in it offensive. WHY ? Have no idea. I waste WAY more money on other stuff. Some of it is because swapping those tanks is such a PIA. Not so much about the money..