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For
the most efficient use of the gun, always make a careful check
that all parts are the proper size and type, and are in perfect
working order before operating. The following items can serve
as a checklist:
Manifolds
and Regulators: The CFM capacity should be at least
one and one half (1.5) times the total capacity required
by the equipment. A separate regulator should control the
atomizing air and all gauges should be readable and in good
working condition.
Moisture
and Oil Traps: In order to assure the least amount of
contamination of the Gel coat, moisture and oil traps should
be installed and drained daily (minimum) on all air lines
at the spray booth. Traps must be installed on the lines
at least 25 feet away from the air compressor.
Quick
Disconnects: Quick disconnects are not recommended for
airless or high pressure systems, and may reduce the volume
of air and fluids passing through them. If they are used,
they should be the largest size available.
Hoses:
Hoses are used only for delivering air from a regulator
on a main air line and fluids from the fluid pump to the
gun. The standard hose length is 25 feet and should never
exceed 50 feet. Hose capacity should match the volume delivery
and pressure demanded by the gun when the trigger is pulled.
Hoses must be capable of delivering the material at the
volume and pressure rates dictated by the gun. There will
always be a pressure drop from one end of the hose to the
other.
CAUTION:
Construction materials for airless hoses and catalysts must
be compatible. Always consult manufacturer's recommendations
for proper hose.
|
Pounds
of Pressure
|
|
60
lbs
|
70
lbs
|
80
lbs
|
| 1/4"
Inside Hose Diameter |
Air
Pressure Drop at Gun
|
| 20'
Hose |
16-3/4
|
19-1/2
|
31
|
| 25'
Hose |
19
|
22-1/2
|
34
|
| 50'
Hose |
31
|
34
|
37
|
| |
|
| 5/16"
Inside Hose Diameter |
Air
Pressure Drop at Gun
|
| 20'
Hose |
5-1/2
|
6-3/4
|
8
|
| 25'
Hose |
6
|
7-1/4
|
8-3/4
|
| 50'
Hose |
11-1/2
|
13
|
14-1/2
|
|
|
|
|
|
|
|
|
PLANT
AIR SUPPLY
The
plant's main air lines should be steel pipe, as large in diameter
as possible and designed for compressed air.
Adequate
compressor capacity is required to supply enough air volume
and pressure to run every piece of air powered equipment in
the plant at the same time. Pipes should be laid out as straight,
and with as few fittings, as possible. Drop lines should come
off the top of main air lines. Lines should slant slightly
to drain off any accumulated water. Air lines should be located
off drop lines at least 12 inches from the end with a drain
valve installed on the bottom. It is desirable for the molding
line to have its own air supply.
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