| Re: [GMCnet] Viair air Compressor deal [message #68338] |
Fri, 25 December 2009 12:51  |
kenneth hugelier
Messages: 89
Registered: August 2008
Karma: 0
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Let's see if I remember this correctly. Duty cycle is a rating that expresses how long a piece of equipment (in this case the compressor) can run at it's maximum rated capacity during a period of run time. In other words, if the compressor ran for one hour, a 25% duty cycle unit could withstand 15 minutes of it's rated maximum output. If you demand more of it during that one hour period, you do it at your peril. The other 75% of the one hour period, the unit could be asked to put out less than it's capacity. So, on the other hand, a 100% duty cycle compressor, can be asked to run at it's maximum capacity for the entire one hour time period. You can see the difference.
Others please chime in here to correct me or to clarify.
Oh, and a MERRY CHRISTMAS TO ALL. I am prepared to leave for the South in the morning.
I will post along the way.
ken "ten percent duty cycle" hugelier 77 PB Det. Mich.
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| Re: [GMCnet] Viair air Compressor deal [message #68354 is a reply to message #68338] |
Fri, 25 December 2009 14:30  |
jayrabe
Messages: 509
Registered: June 2009
Location: Portland, OR
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I interpreted it to mean, if you run it 5 minutes at max load, you need to cool it off for 15 minutes or risk burning up bearings etc.
A 100% duty cycle machine you can turn on and leave running constantly.
Is that right?
J
> Date: Fri, 25 Dec 2009 10:51:35 -0800
> From: kahugelier@sbcglobal.net
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Viair air Compressor deal
>
> Let's see if I remember this correctly. Duty cycle is a rating that expresses how long a piece of equipment (in this case the compressor) can run at it's maximum rated capacity during a period of run time. In other words, if the compressor ran for one hour, a 25% duty cycle unit could withstand 15 minutes of it's rated maximum output. If you demand more of it during that one hour period, you do it at your peril. The other 75% of the one hour period, the unit could be asked to put out less than it's capacity. So, on the other hand, a 100% duty cycle compressor, can be asked to run at it's maximum capacity for the entire one hour time period. You can see the difference.
> Others please chime in here to correct me or to clarify.
>
> Oh, and a MERRY CHRISTMAS TO ALL. I am prepared to leave for the South in the morning.
> I will post along the way.
>
> ken "ten percent duty cycle" hugelier 77 PB Det. Mich.
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| Re: [GMCnet] Viair air Compressor deal [message #68355 is a reply to message #68354] |
Fri, 25 December 2009 14:41 |
GMCWiperMan
Messages: 1248
Registered: December 2007
Karma: 1
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The big problem is, I've never seen anything that resembled an industry
standard for duty cycle. The fine print on some compressors' documentation
says for 25% duty cycle, 15 minutes on & 45 minutes off. Others, like the
Northern Tool web site define 25% as 15 SECONDS on and 45 off. I think the
only safe thing to do is check the actual item's specs -- or buy 100% & be
skeptical. And remember that if you exceed the rating you probably WILL
burn it up.
JMHO (Even though I drove my newly purchased Birchaven from Kerrville, TX to
DeFuniak Springs, FL in '98 with the Dana running continuously -- and it
still worked pretty good when I learned it shouldn't do that.)
Ken H.
On Fri, Dec 25, 2009 at 3:30 PM, Jay Rabe <jayrabe@hotmail.com> wrote:
>
> I interpreted it to mean, if you run it 5 minutes at max load, you need to
> cool it off for 15 minutes or risk burning up bearings etc.
>
> A 100% duty cycle machine you can turn on and leave running constantly.
>
> Is that right?
>
>
>
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