Compressor

   / Compressor #31  
</font><font color="blue" class="small">( Mine is a true 5 HP electric motor..... not one that is about 2 HP, but some engineer has some fancy way of figuring out how to call it a 5 HP by doing some fancy footwork )</font>

Not fancy footwork.. just depends on how it was rated... could be listed as peak HP?

This is a common situation in many industries. Take audio amplifiers. You generally want to see the watt rating in rms ( root mean square (for the non-electronic types ).. but you still see peak watt ratings used in many applications.. and those just are not realized outputs Sine wave measurement really muddies the watter with differences between average, rms, peak, and peak to peak readings.. not to mention specialized test equipmet.. like peak reading vom's .

Same holds true with most small engine manufacturers. I can run down to tsc and buy a 3500$ lawnmower that advertises the same engine HP as my ford 8n is rated for. No offense.. but a huskie lawnmower doesn't crank out the 'same' 26 HP and my 8n does. Torque has alot to do with it and rpm rating. Reading the specs for what is done when testing engine hp claims is like watching sausage being made. In many cases, the max hp rating of an engine is taken bare bones, and at an rpm that is pretty much just about to make the engine self detonate.. situations you'll never see when mowing the grass...

I chalk it up to too much advertising influence over the engineering process.

Soundguy
 
   / Compressor #32  
CH got the pants sued off them and now rate at "Running HP" in addition to "Peak HP". This makes a huge difference in lighter duty high RPM compressor HP rating.
 
   / Compressor #33  
<font color="blue"> </font>" and at an rpm that is pretty much just about to make the engine self detonate.. situations you'll never see when mowing the grass"...You haven't seen me mow my lawn /forums/images/graemlins/grin.gif.
 
   / Compressor #34  
That's good. We had an old compressor with a 5 hp motor.. and theis new one has the 5hp peak motor.. big difference in motor size.

Soundguy
 
   / Compressor #35  
</font><font color="blue" class="small">( You haven't seen me mow my lawn .
)</font>

/forums/images/graemlins/laugh.gif /forums/images/graemlins/cool.gif /forums/images/graemlins/grin.gif

Good one!

Soundgu
 
   / Compressor
  • Thread Starter
#36  
Here are some news:
Today I bought compressor, industrial grade, made 1978.
It has 4kW(5.5HP), 3phase, 400Volts motor. Pump is 3cyl, single stage, splash lubricated, run at 1200rpm. Tank is 87 liter (25gal).
It increases from 6-9bar for 35 seconds.
So, calculated flow is 450 liter/min - 16cfm, max pressure is 10bar (145psi).

It's not a Quincy, but is pretty heavy built /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif

Need some work on it, to make up it, but it works pretty good for 250$, what I paid for it /forums/images/graemlins/cool.gif
 

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