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A Properly Piped Shop Of Prime Importance for a
Premium Finish.
The bottom line in finishing is a quality paint job. Though on the
surface it may not seem a significant factor in your being able to
turn out a quality paint job, the plumbing of your shop air lines is
very important. Correct installation is necessary for the proper
performance of your equipment - for an uncontaminated air
supply and for sufficient pressure to your spray gun.
Correct airline piping is so important that this one factor alone can
reduce contaminates in your air supply up to 75%*. Reducing con-
taminates to the filter also reduces the frequency of filter replace-
ment, maintenance, and of course, reduces the risk of contami-
nates to the paint supply.
Even the size of the pipe is critical. Did you ever have only 60 or 70
pounds of pressure at your spray gun when your compressor
should deliver 100 pounds? Using pipe that is too small in diam-
eter can cause this pressure drop.
For example, if an air compressor delivers 100 psi through a 100 ft.
pipe, 1/2" in diameter, there’s greater pressure drop than if a 3/4"
diameter pipe were used.
The following chart will help reduce pipe pressure drop.
Minimum Pipe Size Recommendations
Compressor Compressor Main Min. Pipe
Size Capacity Air Line Diameter
1-1/2 and 2 HP 6 to 9 CFM Over 50 ft. 3/4"
3 and 5 HP 12 to 20 CFM Up to 200 ft. 3/4"
Over 200 ft. 1"
5 to 10 HP 20 to 40 CFM Up to 100 ft. 3/4"
100 to 200 ft. 1"
Over 200 ft. 1-1/4"
10 to 15 HP 40 to 60 CFM Up to 100 ft. 1"
100 to 200 ft. 1-1/4"
Over 200 ft. 1-1/2"
Body Shop Air Line Plumbing Guide:
After leaving the air compressor, air line pipe goes straight up
the shop wall as high as possible. This helps prevent any wa-
ter from leaving the compressor and traveling through the pipe.
Horizontal pipes should slope back towards the compressor at
least 4” per 50 ft. As warm air leaves the compressor, it cools
and thereby condenses as it travels through the pipe. This wa-
ter vapor, a problem in itself, also can cause scaling and rust
inside the piping. The backward sloping of the pipe helps push
these contaminates toward the compressor drain.
Take-off comes from the top of the main air supply line at each
air drop. This reduces the risk of water and other contaminates
from traveling down the drop into the water separator.
Pipe diameter must be of sufficient size for the volume of air
being passed as well as the length of pipe used. This will
minimize pressure drop.
First air drop should be at least 25 ft. from the compressor
although 50 ft. is optimum. This allows the compressed air to
cool to room temperature so any condensation can occur
before it gets to the water separator.
Shut-off valve is installed before the point of use filter. This
allows air to be shut off for filter maintenance.
Pipe union installed before DAD-500 allows easy installation
and removal of the air drying system.
Point-of use filter (not shown) attaches to spray gun, order
HAF-507. Strongly recommended for eliminating any remain-
ing contaminates.
Drain Valves - The daily draining of the system at each outlet
disposes of the contaminants that build up in the air supply.
Drain the compressor trap daily if equipped with a manual drain.
Proper maintenance of the air compressor can reduce airborne
contaminants such as particules and oils, and reduce heat and
|operating cost. Check air filters, oil level and perform regular main-
tenance per operators manuals.
Guidelines To Piping Your Shop
• Pipe slopes upward - recommend 4” rise in 50 ft.
• Minimum 25 ft. to first outlet (50 ft. optimum)
• Pipe size (see chart)
• Shut off valve before filter
• Drain daily
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1/06 ©2006 Inc. All rights reserved. Printed in U.S.A.
WARRANTY
This product is covered by DeVilbiss' 1 Year Limited Warranty.
DeVilbiss Worldwide Sales and Service Listing: www.devilbiss.com
Industrial Finishing
DeVilbiss has authorized distributors throughout the world. For
technical assistance or the distributor nearest you, see listing below.
U.S./Canada Technical Service Office:
195 Internationale Blvd., Glendale Heights, IL 60139
Toll-Free Telephone: 1-888-992-4657 (U.S.A. and Canada only)
Toll-Free Fax: 1-800-368-8401
DeVilbiss Automotive Refinishing
DeVilbiss has authorized distributors throughout the world.
For equipment, parts and service, check the Yellow Pages
under “Automotive Body Shop Equipment and Supplies.”
For technical assistance, see listing below.
U.S./Canada Customer Service Office:
1724 Indian Wood Circle, Suite J-K, Maumee, OH 43537
Toll-Free Telephone: 1-800-445-3988 (U.S.A. and Canada only)
Toll-Free Fax: 1-800-445-6643
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