FPI I2450M Manual page 203

Run 1
V – Average gas velocity in the dilution tunnel, ft/sec
s
ASTM E2515 equation (9)
Where:
F
= Adjustment factor for pitot tube center point reading =
p
v
= Dilution tunnel velocity calculated after the multi-point pitot traverse at the center, ft/sec
scent
v
= Dilution tunnel velocity calculated after the multi-point pitot traverse, ft/sec
strav
k
= Pitot tube constant, 85.49
p
C
= Pitot tube coefficient: 0.99, unitless
p
ΔP* = Velocity pressure in the dilution tunnel, in H
Absolute average gas temperature in the dilution tunnel, °R; (°R = °F + 460)
T =
s
P Absolute average gas static pressure in dilution tunnel, = P
=
s
P
= Barometric pressure at test site, in. Hg
bar
P Static pressure of tunnel, in. H
=
g
M **The dilution tunnel wet molecular weight; M
=
s
Sample calculation:
17.04
Fp = =
17.84
V = 0.955
x 85.49 x
s
V = 17.66 ft/s
s
*The ASTM test standard mistakenly has the square root of the average delta p instead of the average of the square root
of delta p. The current EPA Method 2 is also incorrect. This was verified by Mike Toney at EPA.
**The ASTM test standard mistakenly identifies Ms as the dry molecular weight. It should be the wet molecular weight as
indicated in EPA Method 2.
PFS-TECO
0; (in Hg = in H
2
0.955
0.99 x 0.262
Page 9 of 17
V
strav
V
scent
O
2
+ P
bar
0/13.6)
2
= 28.78 assuming a dry weight of 29 lb/lb-mole
s
135.6 +
(
x -0.24
(
29.86 +
13.6
, ASTM E2515 Equation (1)
, in Hg
g
460 1/2
)
)
28.78
x