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Posted by Jim Wilkins on May 14, 2008, 5:32 pm
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> >What is the correct way to hook up more than one?
My pieced-together smaller compressor has one female quick disconnect
directly from the tank and a second one after the regulator. I made
this pipe cross adapter to connect it to another larger compressor or
a portable tank;
O O is pressure gauge #4
>--+--X--> > female QD #3, + cross, X valve, > male QD #2
v v male QD #1
A cross is like a tee but with four legs. You could use a tee and omit
the gauge.
Close the valve and plug QD#1 into the tank of the smaller compressor.
Plug an air hose from the larger compressor into QD#2 and open the
valve to connect them. Close the valve before unplugging.
The portable tank has a female QD in the outlet. Plug QD#1 into it to
fill and use the tank. Fill from QD#2, draw air from #3.
The highest pressure shutoff setting in the system has to be less than
the lowest safety blowoff valve. On mine the large compressor shuts
off at 120PSI, the smaller one's relief opens at 125, which is
probably too close.
The small one has a true 1/2HP motor belted to draw 8-9A at shutoff. I
can sandblast continuously with it at 50PSI, using the large
compressor's tank as a reservoir (the large one runs but needs more
work). The pressure slowly drops while blasting and recovers to ~60PSI
while I fill the cup.
This is an updated rehash of my first RCM discussion with Fitch about
15 years ago.
Jim Wilkins
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Posted by Tom Gardner on May 15, 2008, 12:04 am
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>
>
> >I have a Craftsman 30 gallon 5 horsepower 110 volt air compressor. It
> > puts out 6 cfm at 90. I would like to be able to paint and do more
> > such as sandblast. Could I get another similar sized compressor and
> > hook the both togther or do I have to break down and just buy an
> > expensive bigger compressor?
>
> I have 3 hooked together and they cycle as demand increases or decreases.
What is the correct way to hook up more than one?
*********************************************
Mine all just connect to the main 1" pipe that feed the whole shop. They all
have ball valves on their output. One has it's pressure switch at 65 low/110
high, one set at 70/110, one at 80/110. (if I remember correctly, it's been
years) If #3 kicks in, we're using a LOT of air. 90% of the time only one
compressor is running.
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Posted by Ecnerwal on May 15, 2008, 8:26 am
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> Mine all just connect to the main 1" pipe that feed the whole shop. They all
> have ball valves on their output. One has it's pressure switch at 65 low/110
> high, one set at 70/110, one at 80/110. (if I remember correctly, it's been
> years) If #3 kicks in, we're using a LOT of air. 90% of the time only one
> compressor is running.
You probably should shift the setpoints around every year or so, if the
compressors are similar, to balance the runtime (logic changes if they
are different sizes.)
--
Cats, coffee, chocolate...vices to live by
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Posted by Tom Gardner on May 15, 2008, 11:52 am
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>
>> Mine all just connect to the main 1" pipe that feed the whole shop. They all
>> have ball valves on their output. One has it's pressure switch at 65 low/110
>> high, one set at 70/110, one at 80/110. (if I remember correctly, it's been
>> years) If #3 kicks in, we're using a LOT of air. 90% of the time only one
>> compressor is running.
>
> You probably should shift the setpoints around every year or so, if the
> compressors are similar, to balance the runtime (logic changes if they
> are different sizes.)
>
> --
> Cats, coffee, chocolate...vices to live by
They're Quincys, I'm not sure where they ARE anymore...probably should change
the oil! (kidding!)
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Posted by Bruce L. Bergman on May 15, 2008, 2:21 pm
Please log in for more thread options On Thu, 15 May 2008 11:52:46 -0400, "Tom Gardner"
>>> Mine all just connect to the main 1" pipe that feed the whole shop. They all
>>> have ball valves on their output. One has it's pressure switch at 65 low/110
>>> high, one set at 70/110, one at 80/110. (if I remember correctly, it's been
>>> years) If #3 kicks in, we're using a LOT of air. 90% of the time only one
>>> compressor is running.
>>
>> You probably should shift the setpoints around every year or so, if the
>> compressors are similar, to balance the runtime (logic changes if they
>> are different sizes.)
>
>They're Quincys, I'm not sure where they ARE anymore...probably should change
>the oil! (kidding!)
Use some air, then shut everything else down and follow the low
thumping sound. You'll find it back in the corner.
I wouldn't shift the setpoints, but if they all have magnetic
starters consider wiring in a triplexer between all the pressure
switches and starter coils to rotate the running order - first call
starts them 1 - 2 - 3, second call goes 2 - 3 - 1...
And if they are all big piston units, when one dies look into a
constant-run screw compressor with a VFD for the 'main unit' and save
the piston jobs for backup. Will help your demand charge a Lot just
by eliminating all the start surges.
--<< Bruce >>--
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