SECTION 6 - AIR SYSTEM SERVICE
page 6-9
Air Flow to the Implement
202068C
THEORY OF OPERATION - AIR SYSTEM
NOTE: Refer to your air cart service manual for more
information on the air delivery system from
the air cart to the tillage equipment.
Maintaining similar lengths of hose on all 2 1/2" inch
primary lines is extremely important. The pressure across
all the primary lines at the meter box must be as close as
possible to reduce the chance of both cross migration of
product between the primary lines, and the suction of
extra product past the meter roller.
Since the pressure at the meter box is the sum of all the
pressure drops through the primary lines and the pressure
drop is directly dependant on length of the hoses, the
hoses must be kept as close to each other in length as
possible.
An acceptable length difference would be about four feet.
The hoses with more bends can also cause pressure drops
and therefore should be shorter. The shorter hoses can be
crossed over at the manifold and hitch area to allow for
the extra equalizing of length.
It is important that no hose ever be looped, causing the
product to do a 360
/ change in direction. The air flow
through the product delivery tubes into the manifolds is
not uniform. The inner tubes have higher air velocity
than the outer tubes. At low fan speeds this may not be
apparent; it is more noticeable at high fan speeds.
BALANCING THE AIR FLOW
Balance the air system by either increasing the length of
primary hoses or gently looping them. Length of the
hoses should be similar, with the longer hoses going to
the outside headers. When installing an air package on a
seeding tool it is critical to make the left side hose layout
a mirror image of the right side. Avoid sharp bends,
corners, and kinks when routing hoses as hose life can be
reduced and product flow will be affected. To ensure a
balanced air flow, you can test product delivery. Refer to
‘Methods of Determining Adequate Carrying Velocities’.
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