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Second Air Compressor or Tank for Relatively Long Distance

sberry

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Jun 18, 2005
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35,747
Location
Brethren, Michigan
It obviously helps and I understand the concept of making it last and do. I am all about that. But this isn't a racecar and runni g it within it's design parameters isn't abusing it, it's more efficient and improves transmission losses significantly. Like he said,, it's a pressure problem rather than a true demand issue.
In a busy shop I would also plumb in a second or unused equipment, got no argument with that but its kind of backwards trouble shooting. The performance would take another big leap with the machines set PROPERLY, would cycle a lot less especially with larger tanks.
As to pipe size,, yes above a certain threshold and larger is more helpful if the pressure is low, lower the pressure it's a bigger factor. I mention I have some 1/2 runs, can't tell any difference between them than the 3/4 because the pressure never falls below the output side of the regulator.
Somewhat similar to the concept of using 2 stage on oxygen bottle. As bottle pressure drops the output is stable. In air it makes up for transmission loss, the tool doesn't know how big the pipe is supplying the regulator as long as it sufficient,, it IS the reason it's used, can run a 3/8 hose in to the reg and 1/2 out. Same for gas but the steps and pressures are different margins, 3/8 line to a reg, 3/4 out.
Most,, loss, especially on 2 stage is in secondary, hoses and some fittings. From the comp , say 150#,, Got 5# drop on the main (Could be reduced to 2 with 3/4) and then 35 loss down the reel to the tool, the couple that could be gained on the main is totally irrelevant to operation but could chop the hose length in 1/2 and gain 20 on the end for free.
It's the beauty of 2 stage, simply turn it up a little and all the problems can be compensated for. We had engineer on one of these forums calculated some pos 400$ comp would work for him with 10% juice left over and then spend 4 grand, loops, all kinds of stuff trying to make up for what for what would have cost 400 more on a pos HF 2 stage comp would have done from a 3/8 hose.
 
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sberry

Banned
Joined
Jun 18, 2005
Messages
35,747
Location
Brethren, Michigan
I found a couple bottlenecks on my own when I remodeled. They only showed up a little with a 3/4 gun, below that didn't matter much but I used some smaller hydraulic hose I had on hand for some jumpers. I did them during setup and really forgot. Old hoses are better, you can tell some didnt fit on thr reel the same as they get older, even the outside is bigger than a new one. I have one on a reel, doent leak but bet a guy could roll a 1/2 ball bearing down that old hose. Tools really fly on it.
 
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39CAMC

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Joined
Feb 26, 2019
Messages
471
Location
St. Louis, MO
Any chance you can give us a few photos of the tank, pump, control box, basically anything past just metal, any tags or plates. Usually on the tank will be a metal plate welded on the side. should have specs for capacity, PSI, birthday ETC.

I will get info next time we do service. The compressor is not somewhere where I can walk up to it easily. My partner has an oil change and filter schedule, not sure what it is, but relatively often

Also do you have an idea of how many grinders, sanders, ETC your running here? How many people are in the shop running tools.

Regularly, 1 or 2 die griders, plasma table, tire machine, rack. 4 people using air maximum, usually 2 or 3.

Initially I was thinking 1-2 people running a rack and tire machine but with a bunch of demand in the middle... and high demands air grinder, sanders you could easily be draining you line as if it was wide open. extra tank is providing air both directions, basically doubling its size.

In terms of maintenance, why not do an oil change? or at least see what the oil looks like.

See above about the oil changes.

You are 100% correct on your initial usage assessment. I would be the only one using the rack or tire machine, so never at the same time. In the middle (actually closer to the compressor) is the plasma table and the die grinders.

I am not using many CFM, but need good pressure down with the tire machine. THe metal shop in the middle needs CFM for the plasma and die grinders and pressure, but they weren't having a problem, it was on my end.

THanks all for the info and help. I will get the pump info and draw upon the great amount of knowledge here.

DaveW
 
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Iron Beaver

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May 3, 2020
Messages
684
I would say run tank pressure all the way to the end of the shop, and add a regulator. That way you're sending air at higher pressure but lower flow, which translates into less overall energy loss. (Assuming no leaks)
 

sberry

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Jun 18, 2005
Messages
35,747
Location
Brethren, Michigan
Yes, that's the way 2 stage is designed to work, regulator at far end. As for oil changes, it's kind of a false sense of security,, sort of. Personally I put synthetic and forget about it. I think some is rated in the 5k to 8 k range in an air comp, 4 years of 40 hr run. 20 hrs run be 8 years. My own may be in the 10 yr frame right now, clear yet. I got a couple I will never change.
I looked an old one a while back,,, way before modern oil, I know it's been in 70 years and still clear. It's not used a lot but that's a long time on oil.
 
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