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Hey Trader (or anyone else)

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Martin Kellner

04-09-2002 07:56:31




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In the compressor thread you mentioned "bogus horsepower". what is the difference in ratings, how can it be inflated etc. I am kinda dumb about some stuff, but curious. Also, what is the duty cycle that was mentioned. Thanks for informing me. I would like to know this stuff before I buy a compressor. -- Martin




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Roger

04-09-2002 22:37:54




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 Re: Hey Trader (or anyone else) in reply to Martin Kellner, 04-09-2002 07:56:31  
If you need 100% duty cycle you need a screw or a vane. Reciprocating compressors will start to run very hot at 100% duty cycle, which results in a lot of oil carryover and valve failure. Unless of course, it is liquid cooled ($$$$$). Still, any reciprocating device will be subject to a lot more wear and tear than a rotary device.

On some IR units now, you will see Peak HP and Running HP on the sticker on the tank. One such unit I just saw had 7hp (peak) written on it, while the fine print said 3 hp running. It was still a pretty nice unit for home though, vertical twin, cast iron pump. If I was buying one for my house, it would be that one, or a good cast-iron Campbell Hausfeld. Quincy make some nice smaller machines too.

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John in MA

04-09-2002 14:13:32




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 Re: Hey Trader (or anyone else) in reply to Martin Kellner, 04-09-2002 07:56:31  
Most cheapie air compressors are rated in peak HP. That's the maximum amount of power the motor can deliver while being brought to a total stop, while being hit by lightning. Can be anywhere from a third to double over the real HP.

Next, one horsepower is 746 watts. That means if you're getting more than one HP per 6.4 amps at 115V (or 3.1 at 240V), it's bogus. You're not going to get that good anyway, because motors in the real world aren't 100% efficient. The amp rating on cheap tools is the only way to get a real measure. I should note that most pro compressors (ie: 80 gallon, 240V types) are rated in actual HP.

I have 1/2 HP induction motor that's 8A @ 115, and a 1.5 HP motor that's 19.2A.

Good luck.

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Trader

04-09-2002 08:52:59




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 Re: Hey Trader (or anyone else) in reply to Martin Kellner, 04-09-2002 07:56:31  
Hi Martin, I am by no means an expert and I am sure someone else will be able to post a better answer, But what I have been told is that if a motor is rated at anything other than 1,2,3, 5, 7 1/2, 10 etc.. it is a phony rating. It can still be phony with one of those numbers as well though. I think I also remember that if you look at the amp rating that a 5 hp should be around 25 or 27 amps. Also an air compressor makes about 4cfm per hp. so if you have a 5 horse compressor you should be able to get 20 cfm (idealy) or close to it. If it is not even close that is a clue that the hp rating was phony. as far as duty cycle goes I have not heard of that on a compressor. I think they should all be 100%. Hope this helps and that I am not too far off the mark.

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Don Young

04-09-2002 20:45:19




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 Re: Re: Hey Trader (or anyone else) in reply to Trader, 04-09-2002 08:52:59  
The duty cycle of a compressor is the percentage of running time it is rated at. If the compressor is rated at 50% duty cycle its off time should be equal to its on time for the ratings to apply. Its ratings would be lower for 100% running time. This is basically a cooling function and applies primarily to the motor.



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