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-28-
Model W1666/W1685 (For Machines Mfd. Since 2/15)
SETUP
In most small/medium shops it is only necessary to
calculate the line with the longest duct length or the
most fittings (operating under the assumption that if the
line with the highest resistance works, the others will be
fine).
To.calculate.the.static.pressure.of.any.given.line.in.the.
system,.follow.these.steps:
1. Make a list of each size duct in the line, including
the length, and multiply those numbers by the static
pressure value given in the previous table.
2. List each type of elbow or branch and multiply the
quantity (if more than one) by the static pressure
loss given in the previous table.
3. Add the additional factors from the table in
Figure.35.to your list.
4. Total your list (see Figure.36 for an example) to
come up with your overall static pressure loss
number for that line.
Note: Always account for a seasoned filter, so you
don't end up with a system that only works right
when the filter is clean.
. Additionally, when calculating static pressure loss
to determine if multiple lines can be left open at
the same time, only include the main line numbers
once.
5. Compare the total static pressure loss for that line
to the maximum static pressure loss found on the
data sheet for your machine (located toward the
front of this manual).
—If the CFM for your static pressure loss is above the
requirement of the machine, then the line will
most likely be successful. Congratulations! You’ve
just designed your own dust system. Compile a list
of materials and refer to Accessories beginning
on Page.30,.to start buying the components
necessary to make your system a reality.
Additional.Factors
Static.
Pressure
Seasoned (well used) Dust
Collection Filter
1"
Entry Loss at Large
Machine Hood
2"
Figure.35. Additional factors affecting
static pressure.
Main Line
6" Rigid Pipe (.037) at 20' ........ 0.740
Branch Line
4" Rigid Pipe (.075) at 10' ........ 0.750
4" Flex Pipe (.28) at 5' ........ 1.400
Elbows/Branches
6" 45˚ Y-Branch ................ 0.329
4" 45˚ Elbow ........................ 0.225
Additional Factors
Seasoned Filter ................ 1.000
Total Static Pressure Loss 4.444
Figure 36. Totaling static pressure
numbers.
—If the CFM for your static pressure
loss is below the requirement of
the machine, then that line will
not effectively collect the dust.
You must then modify some of the
factors in that line to reduce the
static pressure loss. Some of the
ways to do this include 1) installing
larger duct, 2) reducing amount of
flexible duct used, 3) increasing
machine dust port size, 4) moving
machine closer to dust collector
to eliminate duct length, and 5)
reducing 90˚ elbows or replacing
them with 45˚ elbows.
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