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OMNI-Test Laboratories, Inc.
PR - Proportional Rate Variation
ASTM E2515 equation (16)
Where:
θ = Total sampling time, min
θ
i
= Length of recording interval, min
V
mi
= Volume of gas sample measured by the dry gas meter during the “ith”
time interval, dcf
V
m
= Volume of gas sample as measured by dry gas meter, dcf
V
si
= Average gas velocity in the dilution tunnel during the "ith" time interval, ft/sec
V
s
= Average gas velocity in the dilution tunnel, ft/sec
T
mi
= Absolute average dry gas meter temperature during the "ith" time interval,
o
R
T
m
= Absolute average dry gas meter temperature,
o
R
T
si
= Absolute average gas temperature in the dilution tunnel during the "ith" time interval,
o
R
T
s
= Absolute average gas temperature in the dilution tunnel,
o
R
Sample calculation (for the first 1 minute interval of Train 1):
590 x 1.426 x 20.20 x ( 165.0 + 460 ) x ( 84.9 + 460 )
10 x 85.62 x 20.67 x ( 94.4 + 460 ) x ( 82.0 + 460 )
PR = 109 %
) (
PR = x 100
100
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   
   
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s mi si m i
si m s mi
T T V V
T T V V
PR
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Control No. P-SSAR-0003 Run 4 emissions
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