Vortex Meter (TRIO-WIRL V) 3 - 12
PN25080
TRIO-WIRL INSTRUCTION MANUAL
1
Valid for 0.03 < Density < 0.08. Consult factory for densities < 0.03 lb/ft
3
.
3.5.1.1 Example for Gases:
Determine the flowmeter size for metering 98,700 scfh
(Q
S
) CO
2
; temperature 185
o
F, pressure = 72 psia.
Refer to Section
for equations.
ρ
S
= 0.1149 lb/ft
3
(CO
2
) (From
Table
1. Convert
ρ
S
to
ρ
:
=0.46 lb/ft
3
2. Convert Q
s
to Q
v
:
Select 3 in. meter size (Q
vmax
= 33,500 acfh). Refer to
Table
3. Pressure drop at
ρ
= 0.462 lb/ft
3
:
Q
v
= 24,653 acfh
4. Range start value at
ρ
= 0.46 lb/ft
3
(see Table
Q
Vmin
= 1138 acfh
3.5.1.2 Pressure Drop, Gas/Superheated Steam
See Figure
for Air (at 70
o
F, 14.7 psia,
ρ
= 0.0749
lb/ft
3
). For other fluid densities the pressure drop can
be calculated using the following equation:
Where:
∆
p’ = Pressure drop, fluid [psi]
∆
p = Pressure drop, air [psi] (from Figure
3.5.1.3 Flowrate Saturated Steam [lb/h]
Example: Determine the flow range for a 2”/DN50 at
100 psig
From Table
: 2”/DN50: 385 - 4,055 lb/hr
Additional information:
Sat. steam temp. = 338
o
F
Saturated Steam Density = 0.255 lb/ft
3
TABLE 3-3. MINIMUM & MAXIMUM FLOWRATES VS. DENSITY, GASES & STEAM
Q
vmin
[ACFH]
Qvmax
[ACFH]
Freq. [Hz]
at Qvmax
Density
<0.08
1
0.09
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
>2.0
Meter Size
Inch
DN
1/2
15
180
180
170
110
90
78
70
62
58
55
52
48
35
780
1840
1
25
425
320
310
220
190
170
150
130
120
110
100
95
70
2900
1825
1-1/2
40
740
700
680
480
390
320
290
280
250
220
210
200
160
12000
2000
2
50
1500
1500
1500
950
790
680
600
540
500
480
440
410
300
15900
1250
3
80
2750
2600
2400
1800
1400
1200
1100
970
900
820
790
730
680
33500
760
4
100
4240
4000
3900
2800
2200
1900
1800
1700
1600
1400
1300
1200
1100
63500
650
6
150
9200
8200
8000
7000
7000
7000
7000
7000
7000
7000
7000
7000
7000
143000
425
8
200
14800
9000
9000
9000
9000
9000
9000
9000
9000
9000
9000
9000
9000
240000
310
10
250
29000 29000 29000 29000 29000 29000 29000 29000 29000 29000 29000 29000 29000 424000
235
12
300
45900 45900 45900 45900 45900 45900 45900 45900 45900 45900 45900 45900 45900 600000
190
ρ
0.1149
72
14.7
----------
530
460 185
+
------------------------
×
=
Qv
98700
0.1149
0.46
----------------
24653
acfh
=
=
∆
p
′
0.46
0.0745
---------------- 0.4 2.5
psi
=
×
=
p
'
∆
ρ
0.0749
----------------
p
∆
×
=