Table B5. Pressure losses and air flows through DustControl 2700 vacuum cleaner: 09/13/2007 Round 3

Before (B) or after (A) adding 5 pounds

Total weight added to vacuum cleaner (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

Filter pressure loss inches of water, corrected for calibration curve of the pressure transducers

Air flow from venturi meter (cfm)

Upstream “before cyclone”

Downstream "after cyclone"

δP

Upstream of final filter (55481)

Downstream of filter at inlet to vacuum cleaner motor (53478)

B

5

7

 -3.4

-12.5

9.1

13.622

13.147

3:32pm

3:34pm

13.67

69.65

A

7.4

-4

-6.4

2.4

13.84

13.055

22.22

71.60

B

5

6.4

 -4.6

-6.6

2

13.824

13.18

3:39pm

3:41pm

18.32

66.62

A

7.8

-4.4

-6.6

2.2

13.832

13.08

21.31

73.49

B

5

8.4

 -4.9

-6.9

2

13.824

13.163

3:47pm

3:48pm

18.79

76.22

A

8.2

-4.5

-6.4

1.9

13.84

13.096

21.08

75.32

B

5.4

8.7

 -5.1

-7.5

2.4

13.815

13.163

3:53pm

3:55pm

18.54

77.55

A

8.1

-4

-6.4

2.4

13.832

13.08

21.31

74.87

B

5.2

8.6

 -4.6

-7

2.4

13.798

13.163

4:00pm

4:02pm

18.07

77.11

A

7.8

-4.2

-6.5

2.3

13.824

13.088

20.86

73.49

B

5

8.8

 -4.5

-6.7

2.2

13.807

13.188

4:08pm

4:11pm

17.63

77.99

A

8.1

-3.9

-6.3

2.4

13.84

13.03

22.91

74.87

B

5.4

8.3

 -4.2

-6.9

2.7

13.807

13.18

4:18pm

4:20pm

17.85

75.78

A

7.8

-3.8

-6.5

2.7

13.824

13.038

22.25

73.49

Final

8.4

-4.3

-6.7

2.4

13.815

13.13

4:26pm

19.45

76.22

¹ Static pressure is the difference in pressure from atmospheric pressure. Negative static pressure indicates that pressure is less than atmospheric pressure.