Specifications
116
FV4000-VT4/VR4 / FS4000-ST4/SR4
D184B097U02
12 Specifications
Change from one to two columns
12.1 Static overpressure in the case of fluids
To avoid cavitation, a static overpressure is required downstream of
the flowmeter (downstream pressure). This can be estimated using
the following formula:
p
,
p
,
p
Dampf
′
Δ
×
+
×
≥
6
2
3
1
2
2
p
=
Static overpressure downstream of the flowmeter (mbar)
Dampf
p
= Steam pressure of fluid at operating temperature (mbar)
p
′
Δ
=
Pressure drop, medium (mbar)
12.2 Standard densities of selected gases
Standard density
Gas
kg/m3
lb/ft3
Acetylenes
Ammonia
Argon
Ethane
Ethylene
Butane
Natural gas
Carbon dioxide
Carbon monoxide
Air
Methane
Neon
Propane
Propylene
Oxygen
Nitrogen
Hydrogen
1,172
0,771
1,780
1,350
1,260
2,700
0,828
1,970
1,250
1,290
0,717
0,890
2,020
1,915
1,430
1,250
0,0899
0,07
0,05
0,11
0,08
0,08
0,17
0,05
0,12
0,08
0,08
0,04
0,06
0,13
0,12
0,09
0,08
0,01
Conversion of standard density (
ρ
n) --> operating density (
ρ
)
T
,
,
n
+
×
ρ
+
×
ρ
=
ρ
273
273
013
1
013
1
12.3 Overload capability
Gases
15 % above maximum flow
Fluids
15 % above maximum flow (no cavitation permitted!)
12.4 Measured value deviation for flow
measurement
Measured value deviation as a percentage of the measured value
under reference conditions (including transmitter), linear measuring
range upwards of Re min (see the table titled "Minimum Reynolds
number").
FV4000-VT4/VR4
FS4000-ST4/SR4
Fluids
≤
± 0,75 %
Gases / Steam
≤
± 1 %
± 0,5 %
12.4.1 Minimum Reynolds number Re min for
linear start of scale value
FV4000-VT4/VR4
Nominal size
Re min x 1,000
DN
Inch
DIN
ANSI
15 1/2“ 10 11
25 1“ 20 23
40 1
1/2“ 20 23
50 2“ 20 22
80 3“ 43 48
100 4“ 33 44
150 6“ 67 80
200 8“ 120 128
250 10“ 96 115
300 12“ 155 157
FS4000-ST4/SR4
DN
Re min
15 1/2“
2100
20 3/4“
3500
25 1“
5200
32 1
1/4“
7600
40 1
1/2“
13500
50 2“
17300
80 3“
15000
100 4“
17500
150 6“
43000
200 8“
44000
300 12“
115000
400 16“
160000
12.4.2 Reproducibility as a percentage of the
measured value
DN
Inch
FV4000-
VT4/VR4
FS4000-
ST4/SR4
15 1/2“
0,3
%
25 ... 250
1“ ... 6“
0,2 %
200 ... 300
8“ ... 12“
0,25 %
0,2 %
Содержание FV4000-VT4
Страница 1: ...Operating Instruction D184B097U02 Vortex Flowmeter Swirl Flowmeter FV4000 VT4 VR4 FS4000 ST4 SR4 ...
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Страница 127: ...Appendix D184B097U02 FV4000 VT4 VR4 FS4000 ST4 SR4 127 ...
Страница 128: ...Appendix 128 FV4000 VT4 VR4 FS4000 ST4 SR4 D184B097U02 ...
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