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ljhhontx
Member

Registered: 03/25/07
Posts: 2
Re: Can you go too big on air line diameter? new [Re: JR_]
      #6034694 - 08/18/12 09:08 PM

I agree, but it only happens once if you leave the compressor and lines hooked up.

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JR_
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Registered: 03/13/09
Posts: 15382
Loc: Rhode Island
Re: Can you go too big on air line diameter? new [Re: ljhhontx]
      #6034711 - 08/18/12 09:24 PM

I've had a cold joint let go at pressure. No big deal... It just pisses air. It's not like it's compressing volatile gases.

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blackhatModerator
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Registered: 02/18/05
Posts: 12182
Loc: Regina Sask Canada
Re: Can you go too big on air line diameter? new [Re: JR_]
      #6034789 - 08/19/12 12:15 AM

One thing to keep in mind planning your layout - large diamemter pipe will have very low velocity. oil and moisture will not travel as far in the pipe. Plan a drain close to the compressor. If you are dealing with metric sized tubing, silfoss will fill the gaps on loose fitting fittings where soft solder won't.

--------------------
Blackhat
"He is not worthy to live at all, that for feare, or danger of death, shunneth his countries service, and his owne honour: seeing death is inevitable and fame of vertue imortall." - Sir Humphrey Gilbert circa 1576.


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A Squared
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Registered: 01/28/05
Posts: 10611
Loc: Anchorage AK
Re: Can you go too big on air line diameter? [Re: JR_]
      #6034798 - 08/19/12 01:40 AM

JR_ said:


LIL
Too much capacity can run a small compressor for too long.
Food for thought.





Ehhhh...

A 10 foot section of 1" diameter pipe has a volume of 94 cubic inches, or about .4 gallons. So, if he used 100 feet (seems a lot for a shop) it would add about 4 gallons of storage capacity to a 50 gallon compressor. Filling up that extra volume once a session is going to be small potatoes compared to running an orbital sander, or a die grinder for a little while.

I'm with you on the brazing vs soldering issue though. The Copper Development Association has design data showing working pressures of 500 psi for up to 200 F with 95-5 solder on 1 inch joints, but even with the more conservative values in your table it's still way more than you'll ever encounter in a shop air system.


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JR_
Honored Veteran

Registered: 03/13/09
Posts: 15382
Loc: Rhode Island
Re: Can you go too big on air line diameter? new [Re: A Squared]
      #6034848 - 08/19/12 06:46 AM

I was talking about adding a lot of capacity to a small pancake or similar sized compressor. Particularly to oil-less types. They get hot if they don't get a break from running.

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daddo
Sparky

Registered: 06/13/04
Posts: 8007
Loc: McQueeney,Texas
Re: Can you go too big on air line diameter? new [Re: JR_]
      #6034910 - 08/19/12 08:37 AM

Here's a good explain of the layout. I like the way the pipe is tilted toward the drip leg.

However, I think a drip leg before the first outlet would be a good idea. Wouldn't it be better to trap some moisture before it get to the main lines?








On a previous compressor I had- noise and vibration was an issue with me using hard pipe, so I installed a vibration isolator between the compressor and the main line.


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JR_
Honored Veteran

Registered: 03/13/09
Posts: 15382
Loc: Rhode Island
Re: Can you go too big on air line diameter? new [Re: daddo]
      #6034921 - 08/19/12 08:55 AM

My next compressor is going in a soundproofed outbuilding

I don't mind the DC noise but that compressor is annoying. I need one of those old slow RPM 2 stage types. I keep checking CL but to no avail.

I have an older one but it needs a 5 HP motor and a double v-belt pulley. Broke the pulley trying to remove it from the motor. Been looking for that too.


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