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OMNI-Test Laboratories, Inc.
V
s
– Average gas velocity in the dilution tunnel, ft/sec
ASTM E2515 equations (9)
Where:
v
scent
= Dilution tunnel velocity calculated after the multi-point pitot traverse at the center, ft/sec
v
strav
= Dilution tunnel velocity calculated after the multi-point pitot traverse, ft/sec
k
p
= Pitot tube constant, 85.49
C
p
= Pitot tube coefficient: 0.99, unitless
∆ P* =
Velocity pressure in the dilution tunnel, in H
2
O
T
s
=
Absolute average gas temperature in the dilution tunnel,
°
R; (
°
R =
°
F + 460)
P
s
=
Absolute average gas static pressure in dilution tunnel, = P
bar
+ P
g
, in Hg
P
bar
= Barometric pressure at test site, in. Hg
P
g
=
Static pressure of tunnel, in. H
2
0; (in Hg = in H
2
0/13.6)
M
s
=
**The dilution tunnel wet molecular weight; M
s
= 28.78 assuming a dry weight of 29 lb/lb-mole
Sample calculation:
19.77
20.32
94.4 + 1/2
V
s
= 0.973 x 85.49 x 0.99
x 0.304 x -0.19
13.6
V
s
=
20.20
ft/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.
, ASTM E2515 Equation (1) F
p
= Adjustment factor for center of tunnel pitot tube placement, Fp =
V
strav
V
scent
Fp = = 0.973
)
460
)
x 28.78
29.68 +
(
(
s s
avg s
avg p p P s
M P
T
P C k F v

      ) (
) (
Control No. P-SSAR-0003 Run 4 emissions
Page 140 of 186