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Single Stage vs Two Stage

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Gamecock

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Jan 15, 2009
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I am about to install pipes for my shop w/ 3 ports. I have a Curtis 2-stage 5hp 80gal compressor, an ES50 I think. I'm starting with the RapidAir 3/4" blue pipe with a regulator/filter between the compressor and feed into the pipe. What should I run the pressure in the tank to... 150? 160? I plan to keep the pipe at 100, is that ok?
 

sberry

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Is the comp brand new? Here is the simple answer, if yes,,,,, leave it alone. leave it the way they set it at the fuggin factory. It doesn't get any better than that and its done by an engineer with expertise directly in this field and is likely done correctly. Part of the reason you bought this nice tool is that it will do something a pos wont is this not correct? Why screw with it and negate any advantage you bought it for?
Put a ball valve on the tank so you can work on it and as an air service disconnect. Pipe from there to a regulator to a convenient location, hook a fil/reg at this point, easiest is close to the reel and doesn't require extra plumbing.
This allows for full adjustment of the system at that point and most efficient transportation of air and all the off/on pressures to meet the tool demand at all times are in place.
 
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The Tool Tyrant

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Bonita, Ca. (San Diego)
I am about to install pipes for my shop w/ 3 ports. I have a Curtis 2-stage 5hp 80gal compressor, an ES50 I think. I'm starting with the RapidAir 3/4" blue pipe with a regulator/filter between the compressor and feed into the pipe. What should I run the pressure in the tank to... 150? 160? I plan to keep the pipe at 100, is that ok?

If you want it to cycle the least amount of times, set it @ 175psi. The pump is designed for it, and you'll save the motor.

Sorry, I just checked and see that the ES50 is a single stage pump designed for 95-125psi, so 125 is the most you should set it to, if not already.
 
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sberry

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This comp is designed to come on where a single shuts off and stay constant above the inlet needed at the regulator. For mechanics shops of this size using 1/2 air guns this would be about 130=135 or so feeding 50 ft reel with 3/8.
The engineer posted some loss about 5# for a hose, not sure how he figured this or at what demand but it is about 1# per foot for heavy 1/2 gun on 3/8, an old hose may flow a bit more as they enlarge over time. This means 140 in the reg and 90 at the tool.
 

sberry

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This is 100 ft of 1/2 in to this reg across the building, reel screwed right to it and feeds another manifold at regulated pressure for tools. The little blue whip could go, the mechanic put it there to run a blow gun for some rebuilding work and I have used it to connect short hose to to bypass the reel.
We really been doing tis a while before the internet so were familiar with the drop and some sizing issues. In my last remodel actually found a couple bottlenecks that were causing a bit of an issue with 3/4 gun probably, they were short and on the hi pressure side and didn't mean anything to the common tools but they are now long gone.
 

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sberry

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I would consider the 3/4 rapid due to the fact I have long lines. While there is some post about fitting loss and putting turns in its a minor issue at this volume, yes, 100 cfm thru a 1/2 pipe and an elbow will effect it but at 25 not much.
Having said this on a home garage with runs 50 ft or less would also consider 1/2 in tha6t Rapid as I so much rather get to smaller fittings and keep as many 1 size as possible. You will be going to 3/8 on the secondary anyway, the loss from short transmission at the correct pressure will be pretty minor and only the difference between the 2 sizes,,, if we are running a 135-175 system a couple pounds pre reg doesn't mean anything to the user.
 

sberry

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But there is no point in buying a nice 2 stage if you don't plumb it like it was meant to for 2 stage, may as well got a pos for 1/2 the money.
 
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