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Operator's Manual (EN) - DC Propane Burnisher - 9 -
8 Hour Time Weighted Average (OSHA Method)
1.5 %CO 100,000cf Hours Operation 1 2 3 4 5 6 7 8
TWA (OSHA Method) 0 change/hr 34 103 206 343 514 719 959 1232
1/2 change/hr 27 70 124 183 246 311 378 445
1 change/hr 22 51 84 118 152 186 220 255
2 change/hr 15 32 49 66 83 100 117 135
Based on the CO production rates shown above the TWA would be exceeded in a 100 x 100 x 10 foot (empty) space
after 3 hours with 2 air changes per hour.
(Assumes no additional CO exposure during 8 hour time period)
The Graph above depicts the relationships of air exchange to time and CO ppm with cubic feet area
and percent CO emissions remaining constant.
1.5% CO Em ission in 500,000 cubic feet w ith 480cc 14 HP
Engine and com plete air/CO m ixing
0
50
100
150
200
250
300
350
400
450
500
012345678910
Tim e (hours)
PPM
0.0 change/hr
1/2 change/hr
1 changes/hr
2 changes/hr
1.5% CO Emission in 750,000 cubic feet with 480cc 14 HP Engine and complete air/CO mixing
0
50
100
150
200
250
300
350
400
450
500
012345678910
Time (hours)
PPM
0.0 change/hr
1/2 change/hr
1 changes/hr
2 changes/hr
The Graph above depicts the relationships of air exchange to time and CO ppm with cubic feet area and percent CO
emissions remaining constant.
Based on the CO production rates shown above the TWA would be exceeded in a 100 x 500 x 10 foot (empty) space
after 6 hours with 2 air changes per hour.
(Assumes no additional CO exposure during 8 hour time period)
8 Hour Time Weighted Average (OSHA Method)
1.5 %CO 500,000cf Hours Operation 1 2 3 4 5 6 7 8
TWA (OSHA Method) 0 change/hr 17 51 103 171 257 360 479 612
1/2 change/hr 14 35 62 92 123 156 189 223
1 change/hr 11 26 42 59 76 93 110 127
2 change/hr 7 16 24 33 42 50 59 67