Measuring orifice VMO

Transcription

Measuring orifice VMO
Technical Information · GB
3.1.0.18 Edition 11.11
•
•
•
•
•
For use as a measuring or restricting orifice
Can be combined with valVario valves and regulators
Air and gas flow rate diagrams to facilitate configuration
Easy installation thanks to flanges with internal thread
Replaceable aluminium washers for optimal adjustment to local operating
conditions
www.kromschroeder.com
2
Table of contents
Measuring orifice VMO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table of contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Examples of application . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1.1 Self recuperative burner for direct heating systems . . . . . . . 4
1.1.2 Continuous control with pneumatic ratio control system . . 4
2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Flow rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 VMO 110, VMO 115, VMO 120, VMO 125 . . . . . . . . . . . . 6
3.2 VMO 232, VMO 240, VMO 250 . . . . . . . . . . . . . . . . . . . . 7
3.3 kV value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Type code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 Project planning information . . . . . . . . . . . . . . . . . . . . . . 10
5.1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.2 Gas line connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1 Seal set VA 1 – 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.2 Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1.1 VMO..R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1.2 VMO..N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1.3 VMO 240F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
VMO · Edition 11.11
t
= To be continued
3
1 Application
The valVario measuring orifice VMO is installed in gas control
and safety systems, as well as in air systems used in industrial and commercial gas heat generation. It can serve as a
restricting orifice when used in conjunction with valVario gas
solenoid valves and gas control valves.
The test points are located in the measuring orifice housing.
The measuring orifice VMO is a good-value alternative in
areas where no standardized measuring orifice is required.
The replaceable washers with different hole sizes allow the
orifice to be adjusted perfectly to the local operating conditions.
Shaft melting furnace
Incineration installation for thermal regenerative flue air
purification
Application
4
1.1 Examples of application
1.1.2 Continuous control with pneumatic ratio control system
1.1.1 Self recuperative burner for direct heating systems
VAS
ZIO
VMO
VAG
M
VAS..L VMO GEH
M
EKO
EKO
LEH
LEH
VMO
IC 20 + BVA
VMO
BVA+IC
Self recuperative burner in a direct heating system with an
inductor for evacuating the flue gases from the furnace. The
inductor generates a vacuum with a centrally positioned nozzle and thus draws the flue gases out of the furnace chamber
through the burner’s heat exchanger. The measuring orifices
VMO are designed to record the gas and air flow rates.
EKO
BVA
With this type of control, the mixture setting can be maintained
over a wide control range while at the same time preventing
air deficiency. This type of control is used in melting furnaces
in the aluminium industry or in regenerative incineration installations in the environment industry, for example. Here, the
measuring orifice VMO is designed to record the gas flow rate.
5
2 Function
Plate bracket
Washer
Housing
Base plate
A plate bracket with a washer is placed in the VMO housing.
There is a hole in the washer through which gas can flow. For
replacing the washer, the base plate of the housing can be
removed in order to pull the plate bracket and washer together
out of the housing.
6
3 Flow rate
The characteristic curves are measured at the test points at
15°C (59°F) for the individual washers.
30
8
20
4
3
2.5
2
1.6
10
8
6
5
4
1.2
3
0.8
2
0.4
1 1
0,1
0,2 0,3
2
3
1
0,1
0,8 1
2
0,2 0,3 0,4 0,6
0,1
5
0,5
0,2 0,3 0,4 0,6
7
10
20
30
3
1
1
4
2
2
3
50 70 100
Legend
 = natural gas (ρ = 0.80 kg/m3)
 = propane (ρ = 2.01 kg/m3)
 = air (ρ = 1.29 kg/m3)
6
10
100
80
60
50
40
10
30
10
30
8
20
8
20
4
10
8
6
5
4
4
3
2.5
2
1.6
3
2.5
2
1.6
10
8
6
5
4
1.2
3
1.2
3
0.8
2
0.8
2
0.4
1 1
0.4
1 1
3
2
6
V'[m3/h (n)]
3
200 300
V' [SCFH]
1
1
2
3
0,8 1
1
5
2
2
50 70 100
3
3
4
8 10
4
20
6
6
200 300
30 40
10
10
20
20
500 700 1000
30
60 100
30
60
V'[m3/h (n)]
2000 3000
V' [SCFH]
10
mm
12
mm
14
m
16 m
mm
VMO 125
40
32
24
20
16
∆p [mbar]
100
80
60
50
40
∆p [inch WC]
∆p [mbar]
40
32
24
20
16
2
3
1
1
20
mm 8 mm
10
VMO 120
∆p [inch WC]
100
80
60
50
40
6m
m
∆p [mbar]
∆p [inch WC]
VMO 110, VMO 115
40
32
24
20
16
6m
m
8m
m
10
mm
12
mm
4m
m
5m
m
3.1 VMO 110, VMO 115, VMO 120, VMO 125
1
2
3
0,8 1
1
5
2
2
50 70 100
3
3
4
8 10
4
20
6
6
200 300
30 40
10
10
20
20
500 700 1000
30
60 100
30
60
V'[m3/h (n)]
2000 3000
V' [SCFH]
Flow rate
7
100
80
60
50
40
10
30
10
30
10
30
8
20
8
20
8
20
4
10
8
6
5
4
4
3
2.5
2
1.6
10
8
6
5
4
4
3
2.5
2
1.6
3
2.5
2
1.6
10
8
6
5
4
1.2
3
1.2
3
1.2
3
0.8
2
0.8
2
0.8
2
0.4
1 1
0.4
1 1
0.4
1 1
2
3
1
10
20
30
8 10
10
50
20
20
500 700 1000
80 100
30 40
30 40
60
60
200 300 400 600 1000
100
100
2000 3000 5000
200 300
200 300
10000
Legend
 = natural gas (ρ = 0.80 kg/m3)
 = propane (ρ = 2.01 kg/m3)
 = air (ρ = 1.29 kg/m3)
600
V'[m3/h (n)]
30000
V' [SCFH]
2
3
1
10
20
30
8 10
10
50
20
20
500 700 1000
80 100
30 40
30 40
60
60
200 300 400 600 1000
100
100
2000 3000 5000
200 300
200 300
10000
32
34 mm
mm
38
mm
VMO 250
40
32
24
20
16
∆p [mbar]
100
80
60
50
40
∆p [inch WC]
VMO 240
40
32
24
20
16
∆p [mbar]
100
80
60
50
40
∆p [inch WC]
∆p [mbar]
∆p [inch WC]
VMO 232
40
32
24
20
16
16
mm
20
mm
24
mm
28
mm
32
mm
16
mm
20
m
24 m
mm
3.2 VMO 232, VMO 240, VMO 250
600
V'[m3/h (n)]
30000
V' [SCFH]
2
3
1
10
20
30
8 10
10
50
20
20
500 700 1000
80 100
30 40
30 40
60
60
200 300 400 600 1000
100
100
2000 3000 5000
200 300
200 300
10000
600
V'[m3/h (n)]
30000
V' [SCFH]
Flow rate
8
3.3 kV value
The measuring orifice is determined using the flow rate diagram or by calculation using the kv value.
Measuring
orifice
Nominal
flange size
VMO 110
DN 10
VMO 115
DN 15
VMO 120
DN 20
VMO 125
DN 25
VMO 232
DN 32
VMO 240
DN 40
VMO 250
DN 50
Hole diameter
Washer [mm]
4
5
6
4
5
6
6
8
10
12
10
12
14
16
18
20
16
20
24
16
20
24
28
32
32
34
38
V· (n)= Flow rate (standard state) [m3/h]
kV = Valve coefficient (see table)
∆p = Pressure loss [bar]
pa = Outlet pressure (absolute) [bar]
ρn = Density [kg/m3] (air 1.29/natural gas 0.80/propane
2.01/butane 2.71)
T = Medium temperature (absolute) [K]
kV [m3/h]
0.5
0.7
1.1
0.5
0.7
1.1
1.0
1.7
2.6
3.8
2.5
3.7
5.2
6.9
9.0
12.2
7.2
10.5
12.5
7.1
10.5
15.5
21.7
30.6
28.7
34.3
50.7
Example
We want to find the hole diameter for the washer and the
nominal flange diameter for a measuring orifice VMO.
We have the maximum flow rate V· (n) max, the outlet pressure pa and the temperature T for the medium of natural gas.
V· (n) max. = 37 m3/h
pa = 30 mbar = 0.03 bar ⇒
pa absolute = 0.03 bar + 1 bar = 1.03 bar
∆pmax. = 0.01 bar (desired)
T = 20°C ⇒
Tabsolute = 20 + 273 K = 293 K
kv =
37
·
514
0.83 · 293
0.01 · 1.03
= 11.1 m3/h
The measuring orifice with the next higher kv value is to be
selected (see table): e.g. VMO 125 with a washer hole diameter of 20 mm.
9
4 Selection
Type
VMO 110
VMO 115
VMO 120
VMO 125
VMO 232
VMO 240
VMO 250
R







N







F
–
–
–
–
–

–
05







M







04 05 06 08
   –
   –
–
–  
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
10
–
–


–
–
–
 = standard,  = available
4.1 Type code
Code
VMO
1–2
–
10–50
R
N
F
05
M
04 – 38
Description
Measuring orifice
Size
Without inlet and outlet flange
Nominal inlet and outlet diameter in DN
Rp internal thread
NPT internal thread
Flange to ISO 7005
pe max 500 mbar
With pressure test points
Orifice diameter* in mm
* Delivery of washers with individual orifice diameter on request.
12
–
–


–
–
–
14
–
–
–

–
–
–
16
–
–
–



–
18
–
–
–

–
–
–
20 24 28 32 34 38
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
 –
–
–
–
  –
–
    –
–
–
–   
Order example
VMO 115R05M05
10
5 Project planning information
5.2 Gas line connection
5.1 Installation
In order to take accurate measurements of the pressure differential on the measuring orifice VMO, it must be ensured
that there is an undisturbed flow of gas at the inlet and outlet
for a distance of ≥ 5 × DN.
≥ 5 DN
≥ 5 DN
Installation position: VMO can be installed as required.
When fitting to pressure regulator VAD, VAG or VAV, the base
plate must be facing the same direction as the regulator body.
Installation position when using other valVario controls: VMO
can be installed downstream of the valVario control or can be
fitted as a standalone device in the pipe.
11
6 Accessories
Orifice
6.1 Seal set VA 1 – 3
A
B
C
D
Scope of delivery:
A 1 x double block seal,
B 2 x O-rings (flange),
C 2 x O-rings (pressure switch),
D 2 x sealing rings (test point).
6.2 Washer
For installing in the plate bracket of measuring orifice VMO.
The hole diameter is engraved on the washer. Supply including the new seal for the base plate.
VMO1 D4 /B
VMO1 D5 /B
VMO1 D6 /B
VMO1 D8 /B
VMO1 D10 /B
VMO1 D12 /B
VMO1 D14 /B
VMO1 D16 /B
VMO1 D18 /B
VMO1 D20 /B
VMO1 Dx /B*
VMO2 D16 /B
VMO2 D20 /B
VMO2 D24 /B
VMO2 D28 /B
VMO2 D32 /B
VMO2 D34 /B
VMO2 D38 /B
VMO2 Dx /B
* Hole diameter on request.
Hole dia.
[mm]
4
5
6
8
10
12
14
16
18
20
xx*
16
20
24
28
32
34
38
xx*
Order No.
74923803
74923804
74923805
74923806
74923807
74923808
74923809
74923810
74923811
74923812
74923813
74923814
74923815
74923816
74923817
74923818
74923819
74923820
74923821
12
7 Technical data
Gas types: natural gas, LPG (gaseous), biologically produced methane (max. 0.1 %-by-vol. H2S) or air; other gases
on request.
The gas must be dry in all conditions and must not contain
condensate.
Max. inlet pressure pe: max. 500 mbar (7.25 psig).
Ambient temperature: -20 to +60°C (-4 to +140°F),
no condensation permitted.
Storage temperature: 0 to +40°C (-4 to +104°F).
Housing: aluminium.
Connection flanges with internal thread: Rp to ISO 7-1,
NPT to ANSI/ASME.
Technical data
13
7.1 Dimensions
H1
H2
D
VMO..R, VMO..N
7.1.1 VMO..R
Type
VMO 110
VMO 115
VMO 120
VMO 125
VMO 225
VMO 232
VMO 240
VMO 250
7.1.2 VMO..N
Connection
Rp
3/8
1/2
3/4
1
1
11/4
11/2
2
DN
10
15
20
25
25
32
40
50
L1
mm
30
30
30
30
34
34
34
34
Dimensions
F
D
H1
mm mm mm
15 62.7 65,1
15 62.7 65,1
23 62.7 65,1
23 62.7 65,1
29
88
81
29
88
81
29
88
81
29
88
81
* Without flanges and connection parts.
F
F
L1
H2
mm
44,6
44,6
44,6
44,6
65,2
65,2
65,2
65,2
Weight*
kg
0.245
0.245
0.245
0.245
0.505
0.505
0.505
0.505
Type
VMO 110
VMO 115
VMO 120
VMO 125
VMO 225
VMO 232
VMO 240
VMO 250
Connection
NPT
3/8
1/2
3/4
1
1
11/4
11/2
2
DN
10
15
20
25
25
32
40
50
L1
inch
1,18
1,18
1,18
1,18
1,34
1,34
1,34
1,34
Dimensions
F
D
H1
inch inch inch
0,59 2,46 2,56
0,59 2,46 2,56
0,91 2,46 2,56
0,91 2,46 2,56
1,14 3,46 3,19
1,14 3,46 3,19
1,14 3,46 3,19
1,14 3,46 3,19
H2
inch
1,75
1,75
1,75
1,75
2,57
2,57
2,57
2,57
Weight*
lbs
0,54
0,54
0,54
0,54
1,11
1,11
1,11
1,11
Technical data > Dimensions
14
D
H1
H2
F
L1
F
7.1.3 VMO 240F
Type
Connection
VMO 240
DN
40
Dimensions
L1
F
D
H1 H2
mm mm mm mm mm
34 66 88
81 65,2
Weight*
kg
0.505
VMO 240F
15
8 Maintenance
Check for external tightness at least once per annum, at least
twice per annum for operation with biologically produced
methane.
16
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Remarks
Kromschröder AG
Michael Rehkamp
m.rehkamp@kromschroeder.com
Osnabrück
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Elster GmbH
Postfach 2809 · 49018 Osnabrück
Strotheweg 1 · 49504 Lotte (Büren)
Germany
T +49 541 1214-0
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agents are available on the Internet:
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Measuring orifice VMO

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