another compressor question
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Posting Guru
Joined: Jun 2004
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From: Dracut, Massachusetts
another compressor question
ok, i priced out the #8-3 wire and it would cost almost 300 bucks, just for the wire i need. 
so i'm abandoning the 220 in the garage idea.
my question is; i have a 26 gallon compressor, and if i get another 26 gallon compressor and plumb them together in addition to incraesing my capacity will it also increase the cfm output?
i'm hoping for about 9 cfm @ 90 psi. that should be more than enough to run anything id need. plus id have about 50 gallons of researve.
i can get a 26-30 gallon compressor for about 100 bucks maybee less and not have to drive far to get it. im just not sure if i should look for a working compressor or just another tank for the capacity im after.
so i'm abandoning the 220 in the garage idea. my question is; i have a 26 gallon compressor, and if i get another 26 gallon compressor and plumb them together in addition to incraesing my capacity will it also increase the cfm output?
i'm hoping for about 9 cfm @ 90 psi. that should be more than enough to run anything id need. plus id have about 50 gallons of researve.
i can get a 26-30 gallon compressor for about 100 bucks maybee less and not have to drive far to get it. im just not sure if i should look for a working compressor or just another tank for the capacity im after.
Posting Guru
Joined: Sep 2004
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From: Sapulpa OK
An extra receiver does nothing to cause your compressor to keep up better. Once it is full it will take longer to empty it but on the other hand it will also take longer to refill it. Do not choose your compressor based on receiver size. Consider only the CFM rating and compare that to the CFM you are going to use. Consult the instruction manual that came with your tool to determind how many CFM it consumes at 90 PSIG and select your compressor to provide ample reserve.
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Posting Guru
Joined: Jun 2004
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From: Dracut, Massachusetts
well what i mean is, if i have 2 working compressors hooked together at the same time will that increase the cfm? if not i'm just going to get another tank so i have more researve.
Junior User
Joined: Oct 2005
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The answer to your question is yes, if you combine two compressors, you will increase the CFM. What you will then have to consider is the increase in draw on your electrical supply. If they both kick in together they will put a heavy amperage load on your system.
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Posting Guru
Joined: Jun 2004
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From: Dracut, Massachusetts
i dont think it would be any different than haveing two window a/c units going at the same time. i have 3 different 110V circuts to choose from so i dont have to worry about overloading the circut. thats for your help.
Senior User
Joined: Dec 2006
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You might already have 220
You said you have three different 110 outlets. If one of the three outlets is on a different leg of the power coming to your house, you have 220 in your garage, or shop.
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Senior User
Joined: Oct 2005
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From: NW NJ
Hi 77F250
Just curious .... what 220V compressor were you going to install that needed #8 wire?
Just curious .... what 220V compressor were you going to install that needed #8 wire?
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Posting Guru
Joined: Jun 2004
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From: Dracut, Massachusetts
i was told id need #8-3 wire and a 50 amp breaker, the same run would double as welder power. why is that not right? the run id have to make is about 100 feet.
Fleet Mechanic
Joined: Jul 2005
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From: Staten Island, NY
If you're going to twin two (or more) compressors you'll need to do a little work on the controls. You'll need a single pressure switch controlling a couple of relays which then control both compressor motors. One of the relays should be a time delay relay so both compressor motors don't start at the same time.
If you just pipe two compressors together the one with the highest cut in pressure will start first. If you're not using enough air at that moment to cause the system pressure to continue to drop the second compressor will never run.
If you just pipe two compressors together the one with the highest cut in pressure will start first. If you're not using enough air at that moment to cause the system pressure to continue to drop the second compressor will never run.
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Posting Guru
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From: Dracut, Massachusetts
right now i think im going to just look for an extra tank so i get more run time.
one question i have is this, the cfm rating, is the rating of the pump correct? the same amout of air comes out of a 5 gallon tank at 90 psi as an 80 gallon tank at 90 psi right?
the reason i ask is i've never had a problem running any air tool with my compressor other than having to stop for the compressor to catch up. which is really only a problem with highspeed tools, like sanders and grinders.
one question i have is this, the cfm rating, is the rating of the pump correct? the same amout of air comes out of a 5 gallon tank at 90 psi as an 80 gallon tank at 90 psi right?
the reason i ask is i've never had a problem running any air tool with my compressor other than having to stop for the compressor to catch up. which is really only a problem with highspeed tools, like sanders and grinders.
Fleet Mechanic
Joined: Jul 2005
Posts: 1,464
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From: Staten Island, NY
right now i think im going to just look for an extra tank so i get more run time.
one question i have is this, the cfm rating, is the rating of the pump correct? the same amout of air comes out of a 5 gallon tank at 90 psi as an 80 gallon tank at 90 psi right?
the reason i ask is i've never had a problem running any air tool with my compressor other than having to stop for the compressor to catch up. which is really only a problem with highspeed tools, like sanders and grinders.
one question i have is this, the cfm rating, is the rating of the pump correct? the same amout of air comes out of a 5 gallon tank at 90 psi as an 80 gallon tank at 90 psi right?
the reason i ask is i've never had a problem running any air tool with my compressor other than having to stop for the compressor to catch up. which is really only a problem with highspeed tools, like sanders and grinders.
Yes, the 5 gallon tank and the 80 gallon tank will both deliver the same volume of air at a given pressure. However the 5 gallon tank won't deliver it for a useable period of time. That's why larger industrial compressors have 150-300 gallon tanks.
The other thing to watch out for is the fact that some inexpensive compressors will advertise the cfm output at a lower pressure. For example: 4.0 cfm @ 45 psi. As the pressure in the tank rises, the compressor head delivers less volume. A compressor head that will deliver 4.0 cfm @ 45 psi may only deliver 1.8 cfm @ 100 psi. That may not be an issue for keeping up with a paint gun but it certainly is for an impact wrench.
Lead Driver
Joined: Jul 2007
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From: Rhode Island
You shouldn't have to worry about startup current, since that only lasts for about 1.5 seconds or less. Yes it should be taken into consideration, but every motor I have has wire rated slightly over the maximum running current, not the startup current.
