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August 2010 Fogging Cannon Trial

Nelson PointNorth yard

Name, Position, Department, Month Date, Year Slide 2

Equipment

Ecology: Fogging CannonSerial No: FC100701Supplier: Wet EarthWater usage: 200 litres/minute

Site Details

The fog cannon was: set up in ‘E’ area at the eastern end at the 575 metre mark (between P106 and

North Boundary Road) operated at its maximum elevation of ~45 degrees

facing west and was able to slew between 180 and 360 degrees of the compass,i.e. north through the west to south

in a straight line vector with the Lump Rescreening Plant and the Hospital monitorwhen the wind was on a bearing of 200–210 degrees

The Equipment

Name, Position, Department, Month Date, Year Slide 3

Trial Details

1. The fogging trial was run over a three-day period between the 14th and 16th of August 2010. It consisted of seven cannon runs and the timing of the runs was based on the weather conditions that would normally see the greatest dust impact on the Hospital monitor.

2. Run numbers 5 and 6 represent the best results based on the wind vector for the North Yard plant and the fog cannon position with respect to the line of sight to the Hospital monitor. When the source of the dust, the operating fog cannon and the Hospital BAM monitor were aligned, the monitor recorded a significant reduction in the PM10 dust concentration. When the fog cannon was not running the dust levels can be seen to climb (see the Hospital trend page).

Method Used

Name, Position, Department, Month Date, Year Slide 4

Run# / date Start time Stop time Duration Wind Directi

on

Wind Speed

Plant online Hospital monitor

Airport monitor

Cockburn monitor

Cargill, monitor

Notes

1 14/8 2.30am 3.01am 30 min 153 14 kph CD1,CD2,CD3SL2,BWR4

BWR5,S6,S8

95@2.3041@3.01

14@2.3010@3.01

93@2.3053@3.01

56@2.3064@3.01

Cannon fixed facing west

2 14/8 4.25am 4.55am 30 min 135 12 kph SL1,SL2,BWR4BWR5,CD1,CD

2CD3

28@4.2533@4.55

20@4.2515@4.55

35@4.2533@4.55

111@4.25176@4.55

Cannon fixed facing west

3 14/8 9.05pm 10.30pm 85 min 232 7 kph SL1,SL2,BWR5CD1,CD2,

120@9.05310@10.30

18@9.0512@10.30

137@9.05153@8.53

96@9.05370@10.32

Cannon slewing through 180

degrees

4 14/8 11.00pm 12.00pm 60 min 219 7 kph LRP,ST5,BWR5300@11.0070@12.00

12@11.0015@12.00

151@11.0059@12.00

215@11.00263@12.00

Cannon slewing through 180

degrees

5 15/8 9.05pm 10.32pm 87 min 187-199 7 kph LRP BWR4BWR5,S4,S5,

CD1

97@9.05109@10.32

31@9.0517@10.32

98@9.05109@10.32

81@9.0572@10.32

Slewing, wind dropped to

4kph

6 15/8 11.35pm 12.30pm 55 min 200-175 7 kph LRP,CD1CD2,CD3

BWR5

193@11.35154@12.30

12@11.358@12.30

182@11.35148@12.30

46@11.35349@12.30

Light winds

7 16/8 1.10am 1.52am 42 min 154 14 kph LRP,SL1,S4BWR5,S8

253@1.1070@1.52

4@1.1012@1.52

132@1.1075@1.52

248@1.1084@1.52

Winds increasing

The Data

Name, Position, Department, Month Date, Year Slide 5

Cannon started

Cannon started

Major drop in dust due to wind shift off vector

Cannon started

Hospital PM10 for Run Numbers 5, 6 & 7

Name, Position, Department, Month Date, Year Slide 6

Fogging Cannon position

180 deg210 deg

LRP

Hospital Monitor

Cannon Position & Effective Wind Vectors

Name, Position, Department, Month Date, Year Slide 7

Production

1. During runs 5, 6 and 7 the North Yard at Nelson Point was running at a high tonnage rate. Without the fogging cannon being in operation the PM10 dust impacting the Hospital monitor would historically have peaked at a much higher level. Two very distinct drops in the dust levels can be seen on the trend graph. These drops correspond to the running of the fogging cannon. The third significant drop during run 7 was mainly attributed to the wind direction change occurring during the run.

2. The other trial fog cannon runs (1, 2, 3 and 4) show that when the wind was not in the right vector for where the fog cannon was located (180 to 210 degrees) the reduction of dust at the monitor was much less marked.

Results

Name, Position, Department, Month Date, Year Slide 8

LRP1 THROUGHPUT

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LRP

Shiploader 1

Run #5 start Run #7 stop

North Yard Plant On-line Run No’s 5, 6 & 7

Name, Position, Department, Month Date, Year Slide 9

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BWR 4

Name, Position, Department, Month Date, Year Slide 10

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Name, Position, Department, Month Date, Year Slide 11

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Yandi Fines Yandi Lump NROM Mac ROM Mac Fines Mac Lump Series3 CD1 All Products New Rake Moisture P2 (D1)

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Yandi Fines Yandi Lump NROM Mac ROM Mac Fines MAC Lump Series2 New Rake

Name, Position, Department, Month Date, Year Slide 12

1. The water nozzles on the fogging cannon did not clog during the trial.

2. The cannon pump pressure recorded at the commencement of the trail was 2500 kpa and at the end was 2200 kpa after 430 minutes of use.

3. The cannon is reliant on high water pressure delivery and if the water pressure drops below 600 kpa the cannon will shut down, requiring manual reset once water pressure is reinstated.

4. Provision of a 5000 litre header tank would reduce the possibility of the cannon tripping out due to water pressure fluctuations and provide 25 minutes of running time.

End of Trial Observations

Name, Position, Department, Month Date, Year Slide 13