compressed air piping

[StereoInstaller1]

True story. I had a bunch of books I had to study out of when I got my present job. In one of them it had a topic on this. Oils from compressors migrate and with the moisture it makes an acidic compound.

See?

There is supposed to be some special PVC tubing made just for this purpose. I NEED to get my shop plumbed before spring...I iz gonna be busy, and airhoses trailing all over the shop blows! (haha, get it?).

Anyone got leads on air hose reels that are better than Harbor Freight cheapies but aren't $150 each?

Luke

[bdi_fc]

My dad uses PVC for his overhead compressed air piping with no issues in 5 years.

But, according to OSHA, that's a bad idea:
http://www.osha.gov/dts/hib/hib_data/hib19880520.html

Then again, his is enclosed in the ceiling and the pressure does not typically exceed 90 PSI.

[trent]

My dad uses PVC for his overhead compressed air piping with no issues in 5 years.

But, according to OSHA, that's a bad idea:
http://www.osha.gov/dts/hib/hib_data/hib19880520.html

Then again, his is enclosed in the ceiling and the pressure does not typically exceed 90 PSI.

huh? Why does it not see over 90? They should have compressor pressure in them.

[trent]

"Last year, a section of PVC pipe being used for compressed air exploded 27 feet above a warehouse floor. A fragment of the pipe flew 60 feet and embedded itself in a roll of paper. Fortunately, nobody was in the area at the time.
A PVC pipe explosion in a new plant in Selah broke an employee's nose and cut his face.

PVC piping buried 3 feet underground at a Yakima manufacturing plant exploded, opening up a crater approximately 4 feet deep by 3 feet across. "

Sweet!!!

[hugh jass]

huh? Why does it not see over 90? They should have compressor pressure in them.

prolly has the pressure set at 90 psi at the compressor. most air tools don't need more than 90 psi.

[trent]

prolly has the pressure set at 90 psi at the compressor. most air tools don't need more than 90 psi.

Yea, but that is the lame way to do it. There are SIGNIFICANT PSI losses when traveling through pipe and hose. 90 in the compressor, depending on pipe and hose can dump down to as low as 40-60PSI. Idealy, you want to have the pressure set *AT* the tool you are using. This is why GOOD paint guns have pressure setters ON the gun -- as they are very senstative to PSI changes.

[hugh jass]

Yea, but that is the lame way to do it. There are SIGNIFICANT PSI losses when traveling through pipe and hose. 90 in the compressor, depending on pipe and hose can dump down to as low as 40-60PSI. Idealy, you want to have the pressure set *AT* the tool you are using. This is why GOOD paint guns have pressure setters ON the gun -- as they are very senstative to PSI changes.

yo, check it

http://www.engineeringtoolbox.com/compressed-air-pressure-loss-d_1014.html

if you are losing significant psi through a hard pipe system, it means the pipe isn't big enough for the amount of air you are trying to move. for my garage, i'm probably losing 2 to 3 psi over the entire system with 1/2" copper and a 50' hose reel.

[trent]

yo, check it

http://www.engineeringtoolbox.com/compressed-air-pressure-loss-d_1014.html

if you are losing significant psi through a hard pipe system, it means the pipe isn't big enough for the amount of air you are trying to move. for my garage, i'm probably losing 2 to 3 psi over the entire system with 1/2" copper and a 50' hose reel.

Oh I agree, but I doubt most people are not using that large of piping (I am using 3/4 myself). The end hose also plays the most effect. I had a Sharpe spread sheet that listed psi droppings for 1/4 and 3/8 hose in the respective lengths. I will try to dig it up.

[trent]

yo, check it

http://www.engineeringtoolbox.com/compressed-air-pressure-loss-d_1014.html

if you are losing significant psi through a hard pipe system, it means the pipe isn't big enough for the amount of air you are trying to move. for my garage, i'm probably losing 2 to 3 psi over the entire system with 1/2" copper and a 50' hose reel.

Found my chart.

According to Sharpe, on a 1/4ID hose, @90PSI, you achieve a 39-1/2lbs PRESSURE DROP with a 50FT hose.

According to Sharpe, on a 5/16ID hose, @90PSI, you achieve a 16lbs PRESSURE DROP with a 50FT hose.

Either way, even with the bigger ID hose, those 16lbs of pressure drop are more than enough to fuck up a paint job if you are not measuring the pressure at the end of the hose! On normal air tool use, this isn't shit.

. That is the exact reason my Sata has a digital inlet BUILT INTO THE GUN, and all of my other guns have gauges attached on their inlets.

[AndrewBird]

God damn that's a pretty gun (and not just because of the colors).

[bdi_fc]

huh? Why does it not see over 90? They should have compressor pressure in them.

He typically uses the air to power staple guns and other intermittent-use tools. He hasn't been spraying any cars that I know of.

[MikeE30325i]

hey, there were a couple of people here that thought pvc is ok for compressed air. the fact that they learned it's not is justification enough for this thread.
you don't sound like a true gearhead. talking about compressed air and garage shit is fun.

i am sorry dude, but mitch could outdrive and outsmart just about everyone in this group. he is the definition of a true gearhead.

[FredK]

That is the exact reason my Sata has a digital inlet BUILT INTO THE GUN, and all of my other guns have gauges attached on their inlets.

Baller gun.

I suppose the Zippo and 2 knives make it feel like a STEAL at around six bills.

:pimp:

[trent]

tell me about it :P

[BDSax]

ok, i have set up shop air for my dads (insert large unknown sq ft) shop on new machines that we got....had to use a man-lift for the 17 ft ceiling....also note that i have been around porsche's (race cars/street cars) since i was born...trust me im actually more of a gearhead than most of the "r3vers" here

wow, i dont miss him