The Effects of Debris Accumulation Upon Air Flow and Filter Resistance to Air Flow for Four Commercially Available Vacuum Cleaners
Summary Statement
The results of a laboratory study conducted to evaluate how mortar debris affects air flow and pressure losses through a vacuum cleaner’s filters.
May 2008
Table D3. Pressure loss and air flows through Dust Director vacuum cleaner 10-04-2007 Round 1 |
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Before (B) or after (A) adding 5 pounds |
Total weight of debris transferred (lb) |
Venturi meter δP (inches of water) |
Static Pressure Measurements with manometer (inches of water) 1 |
Absolute pressures measured with pressure transducers (psi) |
Time to start loading |
Time to stop loading |
Air flow (cfm) |
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Pressure in vacuum cleaner bag (inches of water) |
Pressure after the bag (inches of water |
Pressure after first filter (inches of water) |
Pressure after second filter (inches of water) |
Pressure after the bag (psi) 87614 |
Pressure after first filter (psi) 53748 |
Pressure after second filter (psi) 55481 |
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B |
5.2 |
7.9 |
-3.7 |
-7.2 |
-8.4 |
-12 |
14.152 |
13.865 |
13.723 |
1:47pm |
1:50pm |
73.95 |
A |
6 |
-2.6 |
-6.5 |
-35.7 |
-38.9 |
14.043 |
12.979 |
12.881 |
|
|
64.51 |
|
B |
10.4 |
5.5 |
-3.5 |
-5.6 |
-34.7 |
-38 |
14.202 |
12.891 |
12.754 |
2:08pm |
2:09pm |
61.76 |
A |
3.5 |
-1.3 |
-6.8 |
-50.6 |
-53.3 |
14.177 |
12.328 |
12.224 |
|
|
49.19 |
|
B |
15.4 |
3.4 |
-1.5 |
-6.1 |
-50 |
-52.6 |
14.177 |
12.344 |
12.232 |
2:22pm |
2:23pm |
48.47 |
A |
2.5 |
-1.5 |
-8.5 |
-57.8 |
-59.9 |
14.11 |
12.069 |
11.938 |
|
|
41.46 |
|
B |
20.4 |
2.8 |
-1.6 |
-8.8 |
-55.6 |
-58.1 |
14.11 |
12.144 |
12.022 |
2:34pm |
2:35pm |
43.92 |
A |
1.2 |
-1 |
-14.1 |
-63.9 |
-65.9 |
13.993 |
11.843 |
11.752 |
|
|
28.48 |
|
B |
25.8 |
2 |
-1.1 |
-12.4 |
-62.5 |
-64.5 |
14.002 |
11.885 |
11.786 |
2:44pm |
2:45pm |
37.00 |
A |
1.4 |
-0.85 |
-16.9 |
-66.5 |
-68.4 |
13.968 |
11.743 |
11.651 |
|
|
30.82 |
|
B |
30.8 |
1.95 |
-1.1 |
-12.8 |
-62.2 |
-63.9 |
14.01 |
11.902 |
11.803 |
2:56pm |
2:57pm |
36.52 |
A |
1.2 |
-0.9 |
-18.2 |
-68.4 |
-70 |
13.876 |
11.684 |
11.584 |
|
|
28.48 |
|
B |
36 |
3.6 |
-2.2 |
-12 |
-49.8 |
-52.5 |
14.085 |
12.361 |
12.409 |
3:09pm |
3:10pm |
49.90 |
A |
1.8 |
-1.2 |
-19.3 |
-63.9 |
-65.9 |
13.885 |
11.843 |
11.736 |
|
|
35.06 |
|
Final |
36 |
3.5 |
-2 |
-13.5 |
-51.3 |
-54.2 |
13.977 |
12.303 |
12.157 |
3:18pm |
|
49.19 |
1 Static pressure is the difference in pressure from atmospheric pressure. These static pressures are less than atmospheric pressure |
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