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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):
385 x 0.798 x 20.17 x ( 94.0 + 460 ) x ( 73.4 + 460 )
5 x 63.27 x 18.48 x ( 76.8 + 460 ) x ( 71.0 + 460 )
PR = 110 %
) (
PR = x 100
100
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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 Low Burn Run 2
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