Sherwood Meridian Series Manual page 60

OMNI-Test Laboratories, Inc.
– Average gas velocity in the dilution tunnel, ft/sec
V
s
ASTM E2515 equations (9)
= 
V F K
s p
Where:
F
= Adjustment factor for center of tunnel pitot tube placement, Fp =
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 diltuion 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:
13.05
Fp = =
15.13
V = 0.863 x 85.49 x
s
V = 12.83 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.
60 of 194
Control No. P-SFDK-0002, Effective date: 5/06/2016
( )
   
C P
p P avg
0; (in Hg = in H
2
0.863
0.99 x 0.219 x
T
s

P M
s s
V
V
O
2
+ P , in Hg
bar g
0/13.6)
2
= 28.78 assuming a dry weight of 29 lb/lb-mole
s
93.6 +
(
(
29.90 +
60 of 194
File - Run 1, Tab - Example Calculations
strav
, ASTM E2515 Equation (1)
scent
460 1/2
)
-0.18
)
28.78
x
13.6