How much? I have to admit that I tend to think in bigger terms than
woodworking, owing to the type of painting I do, so that's my shortcoming in
a discussion like this. I suppose for typical small scale painting it could
How much small diameter hose do you have in your delivery system? Do you so
small scale spraying? Are you getting good atomization and patterning? I
guess if you're getting good results, that's all that really matters for
The main delivery tubing is some sort of 1/2" to 5/8" ID plastic hose,
tee'd off with barbed and clamped fittings. The main line is 100 to 125
feet long, with 8 or 9 20-30' 3/8" air hose drops terminated with Milton
quick connects. The whole rig is run by an Ingersoll Rand 80 gallon
220v compressor. I don't know the HP rating of the compressor, but the
airline is typically charged to 125 PSI.
I connected a standard, 50' x 3/8" hose to the final connector so I
could spray in the parking lot behind the building. Several large
items were sprayed this way. Spray results were as good as I get with
my Fuji 4 stage HVLP rig. However, nobody else was using air. I don't
believe this setup would have worked if others were using air, nor would
I install it in a professional finishing shop or auto paint shop.
Pretty interesting Barry. You've got the pressure and likely, the delivery
capacity in the compressor to somewhat compensate for the friction
loss/restriction in the hose so you're probably ok - or so I would guess. I
really don't stay up late at night calculating these things...
How about nylon tubing? This is similar to what I use:
425psi working pressure, 1700psi burst, it connects easily with brass
compression fittings and it's flexible making routing easy. All for
There is also DOT air hose used in trucks/buses with air brakes. You can
buy it at any heavy truck dealer and you can also get compression
fittings. The 1/2" diameter should carry enough air for the average shop.
I just did a quick search online and found 1/2" DOT air line for 71 cents
per foot. This was at a street rod place, so a truck dealer should be
71 cents a foot is a lot less than copper. don't know what black pipe
goes for these days.
There is a 500 foot roll on ebay for 35 cents a foot plus shipping.
Yeahbut, how much for getting connectors crimped on? Maybe in bulk it
really won't be so bad, but my first reaction was to the thought of what a
simple short length of pre-made air line can cost. I still would not go
with 1/2" line - too much air restriction over length.
So, does this mean that my potato cannon constructed out of schedule 40
PVC is now to be considered "unsafe"? I wrapped a few layers of duct
tape around the combustion chamber, just in case of a blow out - no
BTW, I've got a great book on the subject called "Backyard
Ballistics". All kinds of fun projects involving PVC.
When I worked for the railroad the car knockers would drop a lit fusee
into a pipe they had rigged up to a glad-hand and kick the valve on the
ground air open.
Probably got a good 100 ft or so altitude ... maybe twice that
I think that they used them to signal each other. The fusee goes out
when it strikes anything hard (a gentle sideways tap is sufficient to
extinguish them) so they are actually pretty safe for that use.
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