Spiraflo flowmeters
3.1
Section 3.0
Flowmetering
Spiraflo flowmeters 3.1
Gilflo flowmeters 3.2
Vortex flowmeters 3.3
Orifice plate flowmeters 3.4
Computers, displays and transmitters 3.5
3.0
Flowmetering
3.1
TI-P330-02
MI Issue 1
Spring Loaded Variable Area Steam Meter
Description
The SPIRAX SARCO Steam Meter consists of four basic parts.
1. M111 Transducer. This is installed in the steam line at the point
where the steam flow is to be measured. (See TIS 8.002). It is
supplied complete with a 2m length of 8 core heat resistant cable
for connection to the M322 Conditioning Unit.
2. EL2600 Pressure Transmitter. This provides a 4-20 mA analogue
signal to the M322 Conditioning Unit proportional to line pressure
for superheated steam applications (see TIS 8.023).
3. M322 Conditioning Unit. The function of this unit is to accept flow
rate and temperature signals from the M111 Transducer and pressure
signals from the EL2600 Pressure Transmitter and convert them to
digital form for transmission to the M210G Computer.
4. M210G Flow Computer. This accepts signals from the M322
Conditioning Unit, processes and displays them. The keypad enables
the user to select the parameters to be viewed as well as allowing

300m max
(customer supply)
M 201G Series
Computer
Mains
Supply
Outputs
Alarms etc.
3.1.1
Spiraflo flowmeters
3.1
Installation points to watch
9. A Separator should always be fitted upstream of the Transducer
to remove entrained moisture from the steam. Dry steam is
required for accurate metering. The Separator should be drained
using a Float Trap set.
10. A full line size Strainer with 100 mesh stainless steel screen may
be fitted to prevent dirt and scale reaching the Transducer. This
is especially advisable on old or dirty systems where dirt or
corrosion is present.
11. Ensure gasket faces do not protrude into the pipeline.
12. Insulation of the Transducer is not recommended, especially the
domed cover.
13. A Bellows Sealed Stop Valve may be fitted upstream of the Transducer.
14. It should be remembered that good drainage is always necessary
even with superheated steam systems where significant
condensate loads may be present on start up.
1. Ensure all pipework is adequately supported and properly aligned.
This will prevent waterlogging during shutdown periods and
possible problems on start up.

11
1
9
9
2
12
1
13
4
3D
1
2
5
3
3
24 Volt Supply
Power 24V, .2A, 5W.
RS 232C
4 ¾ 20 mA
Superheat only
Superheat only
Brown
Violet
White
Blue
Black
Yellow
Green
Red
M 111

ö
÷
ý
÷
ø
6, 7 & 8
10
6D
2
3.1.2
TI-P330-02 MI Issue 1
Flowmetering
3.1
3.1.3
TI-P330-03
MI Issue 6
M111 and M115
Transducers for Steam Meters
Description
The transducer is the pipeline unit part of the Spirax Sarco steam
meter. It is intended for use on dry saturated and superheated
steam only.
The transducer is available with the following options:-
M111 SG iron body
M115 Steel body
Cable
Each transducer comes complete with 2 m of heat reistant 8 core cable,
for connection to the conditioning unit.
Associated equipment
M210G Computer

M111 SG iron DIN 1693 GGG 40.3
M115 Steel DIN 17245 GS C25
Internals Stainless steel
Gaskets Exfoliated graphite (EFG)
Flow range on saturated steam
(see chart overleaf)
Minimum flow Maximum flow (at 35 m/s velocity)
Size 1 bar g 17 bar g
DN40 15 kg/h 1 440 kg/h
DN 50 25 kg/h 2 250 kg/h
DN 80 60 kg/h 5 755 kg/h
DN 100 95 kg/h 9 000 kg/h
F
E
C D
A
2 m heat resistant 8 core
cable to conditioning unit
(supplied by Spirax Sarco).
ISO 9001
Cert. No. LRQ 0963008
Spiraflo flowmeters
3.1
3.1.4
Size and Steam pressure bar g
flowrate kg/h 1234567891011121314151617
DN40
a) Maximum 610 740 845 940 1020 1100 1175 1240 1300 1365 1425 1480 1530 1585 1635 1685 1730
b) At 35 m/s velocity 180 260 350 420 500 580 660 740 820 900 970 1050 1120 1200 1275 1350 1440
c) Minimum 15 18 21 23 25 27 29 31 33 34 36 37 38 40 41 42 43

SV = Specific Volume in m³/kg
The saturated steam flow capacities in the above Table are calculated
using this equation. Superheated steam flow capacities can be
calculated in the same way.
Example
What is the capacity of a DN80 transducer on superheated steam at
5 bar g and 200°C.
Assume maximum velocity = 35 m/s SV = 0.352 0 m³/kg
A x V
SV
Q = x 3 600
Installation
Separate Installation and Maintenance Instructions are supplied
with each transducer. In order to get the best performance from the
transducer, it is essential that installation is correctly carried out in
accordance with the guidelines given in the booklet supplied with
each steam metering system. General guidelines are given in
other TI sheets.
Maintenance
The Spirax Sarco transducer is a sealed and calibrated unit with no
user serviceable parts.
How to order
Example: 1 off DN40 M111 Spirax Sarco steam meter transducer
having an SG iron body flanged to BS 4504 PN25. Steam pressure
8 bar g saturated, maximum flowrate 700 kg/h pipeline size DN50.
TI-P330-03 MI Issue 6
Flowmetering
3.2
3.2.1
TI-P337-05

Internals 431 S29/S303/S304/S316
Spring Inconel X750 or equivalent
Performance
The Gilflo ILVA is designed to be used in conjunction with linearising
electronics such as the M240G flow computer (steam), M250G flow
computer (gases) or M700 display unit. Alternatively the output
signal linearisation can be performed on an EMS/BEMS or
equivalent.
Accuracy when used with M240G, M250G, M640 or M700:
+/- 1% of measured value from 5% to 100% of maximum rated flow.
+/- 0.1% FSD from 1% to 5% of maximum rated flow.
Repeatability better than 0.25%
Turndown: up to 100:1
Pressure drop
The pressure drop across the Gilflo ILVA pipeline unit is nominally
500 m bar (200 ins water gauge) at maximum rated flow.
Flow capacity
To determine the capacity of the Gilflo ILVA for different fluids, it is
necessary to calculate the equivalent water flowrate Q
E
(in l/min) as
described under the section 'sizing the Gilflo ILVA' then selecting
the appropriate size of flowmeter from the table.
102
020406080
-50
0
100
200
300

Liquids Q
E
=

M
Q
E
=Q
L
SG
SG
Gases,
Steam
Q
E
=M
1000
Q
E
=

Q
F
D
F
(Flowing D
F
1000
conditions)
Gases

F
1000 P
F
T
S
Sizing the Gilflo ILVA flowmeter
In order to determine the flow capacity of a Gilflo ILVA pipeline unit,
it is necessary to calculate the Equivalent Water Flowrate (Q
E
)
based on the anticipated actual flow.
Figure 2 is then used to select the appropriate unit.
1.Determine Equivalent Water Flowrate (Q
E
) in l/min:-
Where:
Q
E
= Equivalent water D
F
= Density of gas at
flowrate (l/min) flowing conditions (kg/m
3
)
M = Mass flowrate (kg/min) P
S
= Standard pressure
Q
L
= Max liquid flowrate (l/min) = 1.013 bar a

cross sectional changes are permitted within these pipe lengths.
Where an increase in nominal pipe diameter is required upstream of
the meter, the length of straight pipe should be increased to 12
diameters. Similarly, where a Gilflo ILVA is installed downstream of
two 90 degree bends in two planes, a pressure reducing valve or a
partially open valve, 12 upstream pipe diameters should be allowed.
2. It is important that the internal upstream and downstream
diameters of pipe are smooth. Ideally seamless pipes should be
used and there should be no intrusive weld beads on the internal
diameter. It is recommended that slip-on flanges be used to avoid
any intrusive weld beads on the internal diameter of the pipe.
3. Care should be taken to install the Gilflo ILVA concentrically in
the line. If this is not done, flow measurement errors may occur.
4. The Gilflo ILVA should be mounted horizontally. For vertical
installations, consult Spirax Sarco.
5. For steam applications, good basic steam engineering practices
should be followed:
• Correct line drainage through adequate trapping.
• Good alignment and support of associated pipework.
• Line size changes achieved by the use of eccentric reducers.
6. See TI-P337-06 which provides an overview of the Gilflo ILVA
metering system and further installation details.
Maintenance
There are no user serviceable parts in the Gilflo ILVA. A visual
check together with confirmation that the orifice/cone reference
dimension is within tolerance is possible. Full details are included in
the manual that accompanies the meter.
Flowmeter type Max. Q
E
Max. DP

Ö
1.29
x
1.013
x
293
1000 8.013 273
Q
E
= (500 x 16.667) x
Q
E
= 110 l/min.
Sizing the Gilflo ILVA for saturated steam - kg/h
Maximum flow rates in kg/h at different pressures (bar g)
Note: Maximum steam flowrates are calculated at maximum differential
pressure.
Size Steam pressure bar g 1 3 5 7 10 12 15 20 25 30 40
DN50
Maximum flow 300 416 503 577 671 727 804 918 1020 1113 1283
Minimum flow 3 4 5 67789101113
DN80
Maximum flow 1179 1632 1976 2264 2635 2855 3156 3603 4003 4371 5039
Minimum flow 12 16 20 23 26 29 32 36 40 44 50
DN100
Maximum flow 3629 5023 6080 6967 8108 8784 9709 11085 12317 13449 15505
Minimum flow 36 50 61 70 81 88 97 111 123 134 155
DN150
Maximum flow 5847 8092 9795 11224 13062 14152 15643 17859 19843 21667 24980
Minimum flow 58 81 98 112 131 142 156 179 198 217 250

i- To act as a suitable input to an EMS/BEMS which can be
programmed by the user to carry out the linearising of the
output signal based on the calibration data that is supplied
with each Gilflo ILVA flowmeter. Additional inputs from the
EL2600 pressure transmitter and EL2271 temperature
transmitter can be used to carry out density compensation
for compressible flow applications.
ii- To supply an M700 display unit. This gives a non-
compensated display of rate of flow and totalised flow. It is
suitable for liquid, gas and steam applications where density
compensation is not required.
iii-To supply an M240G (steam) or M250G (gas) flow computer.
Use of the pressure and temperature transmitters enables
automatic density compensation to be carried out for
compressible flow applications. See relevant TI’s for details
of pressure / temperature limits for M240G/ M250G flow
computers.
The Gilflo ILVA pipeline unit can be used to measure the flow of
most industrial liquids, gases and vapours within the pressure and
temperature limits detailed in the TIs.
Installation
Care must be taken to meet all the requirements of the Installation
and Maintenance Instructions that are included with the equipment.
Some installation points to watch are noted overleaf.
In addition, heat metering is possible on saturated steam systems
by replacing the EL2600 pressure transmitter with an EL2271
temperature transmitter in the condensate return line (M240G
system only).
Electrical wiring
All electrical wiring must be carried out to the appropriate standards.

(gases)
Outputs,
alarms,
etc.
Outputs,
alarms,
etc.
Outputs,
alarms,
etc.
EL2271
temperature
transmitter
or
or
or
Gilflo ILVA
ISO 9001
Cert. No. LRQ 0963008
Gilflo flowmeters
3.2
3.2.4
TI-P337-06 MI Issue 3
Installation points to watch:
1. Ensure that all pipework is adequately supported and properly aligned. Special care should be taken to ensure that the Gilflo
ILVA pipeline unit is concentrically mounted in the line. (Special installation kits are available to order for sizes DN50 to DN200).
2. The Gilflo ILVA pipeline unit should be selected on capacity rather than line size. Where line size changes on steam systems
are necessary, use eccentric reducers to avoid build-up of condensate.
3. The minimum recommended lengths of straight pipe upstream and downstream are 6 D and 3 D respectively. See (TI-P337-05)
for more details concerning the Gilflo ILVA.

Maximum viscosity 30 centipoise
Operating range
Accuracy
When used in conjunction with an M200 series flow computer,
M640 steam mass flow transmitter or M700 display unit, accuracy
is better than ±1 % of actual flow from 5 % to 100 % of maximum
rated flow. For flows from 1 % to 5 % of maximum rated flow,
accuracy will be better than ±0.1 % FSD. Repeatability is better
than 0.25 %.
Pressure drop
Less than 140 inches H
2
O (349 mbar) at rated capacity
Flow capacity
To determine the maximum flow capacity of a Gilflo 'Spool', it is
necessary to calculate the equivalent water flowrate (Q
E
). See under
section "Sizing the Gilflo 'Spool' flowmeter".
Materials of construction
Body Carbon steel ASTM A105 / A106 / A234
Internals Mostly stainless steel S304 / S316
Spring Inconel X750
Low DP tapping
High DP tapping
The product should not be used in this region.
A - A Flanged PN40
B - B Flanged ANSI 300
10 20 30 40 51
-50

a particular application, it is neccessary to calculate the equivalent
water flowrate (Q
E
) based on the maximum anticipated actual flow.
Mass flow units Volumetric units
Liquids Q
E
=
M
Q
E
= Q
L

SG

SG
Gases and
steam
Q
E
= M

1 000
Q
E
= Q
F

D

standard
D
S

x
P
F

x
T
S 1 000 P
F
T
S
conditions
1 000
P
S
T
F
Where:
Q
E
= Equivalent water flowrate (litres / min)
M = Mass flowrate (kg / min)
Q
L

7 psi a
P
F
= Actual flow pressure in same absolute units as P
S
T
S
= Standard temperature (°C) +273
T
F
= Actual flow temperature (°C) +273
Table 1
- Equivalent water flowrates Q
E
Size
Q
E
equivalent water flowrate litres / min
Gilflo 'Spool' flowmeter
DN80 365
DN100 940
DN150 1660
DN200 3940
DN300 7380
Note: These equivalent water flowrates are based on a differential
pressure of 140 inches H
2
O (349 mbar). For saturated steam flow
measurement, Table 2 below gives flow capacities.
Dimensions / weights

• Ensure good alignment and support of all associated pipework.
• Achieve line size reduction by the use of eccentric reducers.
• Avoid close installation (less than 25 pipe diameters) upstream
or downstream of a pressure reducing valve or modulating
valve.
See the "Gilflo flowmeters - system overview', TI-S41-10 which
provides information on the installation of a Gilflo metering system.
B
A
Table 2
- Gilflo 'Spool' flowmeter maximum saturated steam flowrate in kg / h
Size 1 bar g 3 bar g 5 bar g 8 bar g 12 bar g 18 bar g 30 bar g 40 bar g
DN80 750 1 040 1 265 1 535 1 840 2 220 2 840 3 280
DN100 1 940 2 695 3 265 3 970 4 750 5 730 7 340 8 470
DN150 3 420 4 750 5 760 7 000 8 370 10 105 12 945 14 930
DN200 8 130 11 295 13 695 16 635 19 910 24 030 30 790 35 510
DN300 15 195 21 095 25 595 31 105 37 200 44 855 57 405 66 410
Note: These capacities are based on a differential pressure across the meter of 140 inches H
2
O ( 349 mbar).
Minimum flow is 1 % of maximum (100:1 turndown).
How to order
1 - DN150 Spirax Sarco Gilflo 'Spool' flowmeter flanged to BS 4504 PN40.
Ö
Ö
Ö
Ö
Ö
Ö
Flowmetering

together with a revised spring location.
High DP tapping
Sizes and pipe connections
DN50*, 80, 100, 150, 200, 250, 300 and 400
Flanges available to BS 4504 PN40* and ANSI B 16.5 class 300
Note:
On the DN50 flowmeter, flanges to PN40 are thicker (to ANSI 300,
22.2 mm) to accommodate pressure tappings.
On the DN400 flowmeter, the pressure tappings are on the body.
Limiting conditions
Minimum operating pressure 0.6 bar g
Maximum operating pressure 51 bar g
Minimum operating temperature -50°C
Maximum operating temperature 450°C
Maximum viscosity 30 centipoise
Operating range
Materials
Body Carbon steel ASTM A105 / A106 / A234
Internals Mostly stainless steel S304 / S316
Spring Inconel X750
Performance
When used in conjunction with an M200 series flow computer,
accuracy is better than ±1% of actual flow from 5% to 100% of
maximum rated flow. For flows from 1% to 5% of maximum rated
flow, accuracy will be better than ±0.1% FSD. Repeatability is
better than 0.25%.
Caution: M640 steam mass flow transmitters are uniquely
configured at the factory to work with a single, specific Gilflo, ILVA
or M410 orifice plate flowmeter. For correct operation the configured
M640 transmitter must always be installed with its allocated

Size 1 bar g 3 bar g 5 bar g 8 bar g 12 bar g 18 bar g 30 bar g 40 bar g
DN50 730 1 015 1 230 1 490 1 785 2 155 2 765 3 185
DN80 2 400 3 330 4 035 4 905 5 870 7 085 9 080 10 470
DN100 3 860 5 355 6 495 7 890 9 444 11 400 14 605 16 845
DN150 9 380 13 030 15 795 19 195 22 970 27 725 35 525 40 975
DN200 16 650 23 120 28 050 34 090 40 765 49 155 62 910 72 775
DN250 22 900 31 790 38 565 47 407 56 050 67 590 86 500 100 065
DN300 39 760 55 101 66 965 81 930 97 320 117 355 150 200 173 750
DN400 64 580 89 650 108 770 132 200 158 080 190 620 243 970 282 220
Note: These capacities are based on a differential pressure across the flowmeter of 140 inches H
2
O (349 mbar).
Minimum flow is 1% of maximum (100:1 turndown).
How to order
Example: 1 off Spirax Sarco DN150 Gilflo 'B' flowmeter flanged to BS 4504 PN40.
Ö
Ö
Ö
Ö
Ö
Ö
B
A
Dimensions / weights
(approximate) in mm and kg
Size A B Weight
DN50* 480 89 14
DN80 543 114 22
DN100 716 168 48
DN150 797 219 87

flowmeter. This should be drained using a float trap set.
- Ensure good alignment and support of all associated pipework.
- Achieve line size reduction by the use of eccentric reducers.
- Avoid close installation (less than 25 pipe diameters) upstream
or downstream of a pressure reducing valve or modulating
valve.
4. See the "Gilflo flowmeters - system overview', TI-S41-10 which
provides information on the installation of a Gilflo flowmetering system.
*
Maintenance
There are no user serviceable parts within the Gilflo 'B' flowmeter.
Mechanical checks to confirm correct operation are described in the
Installation and Maintenance Instructions that accompanies the
flowmeter.
Routine maintenance of the flow measurement system as a whole is
described in the manuals that accompany the component items.
Sizing the Gilflo 'B' flowmeter
In order to determine the flow capacity of a Gilflo 'B' flowmeter for a
particular application, it is neccessary to calculate the equivalent
water flowrate (Q
E
) based on the maximum anticipated actual flow.
Mass flow units Volumetric units
Liquids Q
E
=
m
Q
E
= Q


m
Q
E
= Q
S

D
Sx
P
S

x
T
F
standard
D
S

x
P
F

x
T
S


)
D
F
= Density of gas at actual flow conditions (kg/m
3
)
P
S
= Standard pressure (atmospheric) = 1
.
013 bar a
=1
.
033 kg/cm
2
a
= 14.70 psi a
P
F
= Actual flow pressure in same absolute units as P
S
T
S
= Standard temperature (273°C)
T
F
= Actual flow temperature (273°C)
Table 1
- Equivalent water flowrates Q
E

Description
The Spirax Sarco Gilflo flowmetering system consists of 3 major parts:
1. The Gilflo pipeline unit. This may be a Gilflo 'B' or 'Spool' design.
This is installed in the line where the flow is to be measured.
Using impulse pipework, this is connected to:
2. An M610 differential pressure transmitter which measures the
differential pressure across the Gilflo and converts it into a
4 - 20 mA signal. (M610 provides an uncompensated signal,
or (M640 provides a compensated signal for saturated steam)
This signal can then be transmitted to:
3. a - A Chart recorder, EMS / BMS or M700 display unit.
b - An M240 or M250 flow computer.
Note: The Gilflo pipeline unit can be used to measure the flow of
most industrial liquids, gases and vapours within the pressure and
temperature limits detailed in the appropriate TI document(s).
Density compensation may be provided by:
M640 - Pressure compensated saturated steam.
M240 - Pressure and/or temperature compensated saturated or
superheated steam. In addition heat metering is possible by replacing
the EL2600 pressure transmitter with an EL2271 temperature
transmitter in the condensate return line.
M250 - Pressure and temperature compensated industrial gases:
Caution: M640 steam mass flow transmitters are uniquely
configured at the factory to work with a single, specific Gilflo, ILVA
or M410 orifice plate flowmeter. For correct operation the configured
M640 transmitter must always be installed with its allocated
flowmeter. Labels on the packaging give the serial numbers of the
matched products.
Caution: M700 display units can be uniquely configured at the
factory to work with a single, specific Gilflo, ILVA or M410 orifice

are positioned above the pipework. Also ensure that the impulse
lines allow free drainage of moisture away from the DP cell and
back into the pipeline.
Electrical wiring
All electrical wiring must be carried out to the appropriate standards.
Full wiring interconnection details are included with the equipment.
or
M250G
flow computer (gas)
Gilflo
Impulse pipework
High
F50C
isolating valves
High DP
Low
M610 or M640
transmitter assembly.
EMS /
BEMS
or
M700
display unit
Outputs,
alarms, etc.
Low DP
Outputs,
alarms, etc.
or
M240G

TI-P338-12
MI Issue 3
VFM3000
Vortex Flowmeter
Description
The VFM3000 vortex flowmeter is used for measuring the flowrate
of steam, gases and liquids based on the vortex shedding
principle.The VFM is supplied configured to customer requirements.
An optional 'in-head' display is available for on-site installation. The
display has buttons for user programming in addition to 'rate' and
'total' indication. A HART COMMS module is also available.
Range availability
Size Wafer to suit flanges: Flanged to:
DN25 1" PN40 and ANSI 300 PN40 and ANSI 300
DN40 1½" PN40 and ANSI 300 PN40 and ANSI 300
DN50 2" PN40 and ANSI 300 PN40 and ANSI 300
DN80 3" PN40 and ANSI 300 PN40 and ANSI 300
DN100 4" PN40 and ANSI 300 PN40 and ANSI 300
DN150 6" N/A PN40 and ANSI 300
DN200 8" N/A PN16 and ANSI 300
Note: Installation kits consisting of bolts, nuts, washers and spacer
tubes are supplied for fitting and centralising the VFM between
flanges for PN40 and ANSI 300 wafer pattern meters. Wafer
meters will also fit PN10, 16, 25, 64, 100, and ANSI 150 flanges.
DN10/
3
/
8
", DN15/½" and DN20/¾" sizes are available to special
order. Contact Spirax Sarco for details.

Electrical requirements
Supply voltage U
B
12-36 Vdc
EEx (ib) 12-15 Vdc
Current output 4-20 mA, dc 2-wire
Scaleable pulse output, maximum
Frequency output (passive) load current 100 mA dc, maximum
pulse rate 0.5 Hz.
Maximum load resistance R
B
=
U
B
-12
< 1200 Ohms
20 mA
Materials
Flowmeter housing/primary
head (wetted parts)
Stainless steel 1.4571/316L
Bluff body (vortex shedder) Titanium (Alloy No. 3.7035)
Electronic housing
Die cast aluminium with
polyurethane finish
Housing/body seal Parofluor V3862/75
Vortex flowmeters
3.3
3.3.2
TI-P338-12 MI Issue 3

that of the flowmeter pipeline. The wafer meters are designed
for imperial schedule 40 pipe. DIN pipework can be used but
with some (1 or 2%) loss of accuracy.
2. Install the flowmeter in line with the pipe axis. Take care that the
gasket does not protrude into the pipeline.
3. Avoid pulsating flow or installations where vibration is present.
Where vibration is evident performance can be improved by
use of pipe supports and by increasing the electronic damping.
However low flow measurement will be adversely affected.
4. For steam metering applications, take care to ensure that the
steam is dry and that any condensate is removed from the
pipeline through the correct use of steam traps and separators.
5. Allow at least 0.5 m between the flowmeter centreline and the
nearest adjacent wall for access.
6. Allow adequate lengths of straight uninterrupted pipe runs
upstream and downstream of the flowmeter.
The following guidelines are minimum requirements:
Inlet run:
Downstream of reducer 20 D
Downstream of 90 degree bend 20 D
Downstream of 2 x 90 degree bends 30 D
Downstream of 3 x 90 degree bends 40 D
Downstream of ball/gate valve 40 D
Downstream of control valve 50 D
Outlet run:
For all applications, allow a minimum of 10 D downstream of the
flowmeter.
Maintenance
Refer to the VFM3000 Installation and Maintainance Instruction
manual for comprehensive details of installation, commisioning,

DN50 PN40 250 356 165 54.5 10.5
2" ANSI 300 250 356 166 52.6 10.7
DN80 PN40 250 393 200 82.5 16.3
3" ANSI 300 250 398 210 78.0 18.6
DN100 PN40 250 419 235 107.1 18.7
4" ANSI 300 250 429 254 102.4 26.8
DN150 PN40 250 517 300 159.3 27.5
6" ANSI 300 250 528 318 154.2 42.4
DN200 PN16 300 571 340 206.5 26.4
8" ANSI 300 300 592 381 202.7 65.2
20
10
5
1
0.5
3
4
5
6
7
8
9
4
3
2
6
7
0.6
0.7
Flowing density kg/m³

where the flow is to be measured. The VFM3000 produces
a 4 - 20 mA output signal.
2. This output signal can be used in a number of ways:-
a- To supply a suitable chart recorder or act as an input to an
EMS/BEMS. This gives a non-compensated signal
proportional to rate of flow.
b- To supply an M700 display unit. This gives a non-compensated
display of totalised flow and rate of flow.
c - To provide a fixed density compensated mass flowrate
(if the line temperature or pressure changes this, will lead
to flow measurement inaccuracies).
d- To supply an M240G or M250G series flow computer,
whose keypad allows the user to select the parameters to
be viewed as well as allowing access to the numerous
facilities available. The diagram shows these configurations.
Note:- The VFM3000 vortex flowmeter can be used to measure the
flow of most industrial gases, vapours and liquids within
the pressure and temperature limits detailed in the appropriate
TI document(s).
Full density compensation from pressure and temperature transmitters
is available when using the M240G series flow computer for steam
applications or the M250G series flow computer for gas applications.
See TI's for details. In addition, heat metering is possible on saturated
steam systems by replacing the EL2600 pressure transmitter with
an EL2271 temperature transmitter in the condensate return line
(M240G system only).
Installation
Care must be taken to meet all the requirements of the Installation
and Maintenance Instructions that are included with the equipment.
Installation points to watch:-

vortex flowmeter
M240G
computer
(steam)
(or)
M250G
computer
(gas)
Output
Outputs,
alarms, etc
M700
display unit
(or)
Note: Chart recorders and EMS / BEMS's may be connected to the
outputs of the M240G, M250G or M700 units. Alternatively, the chart
recorder / EMS/ BEMS may be connected directly to the 4 - 20 mA
output of the VFM3000 vortex flowmeter.
EL2600
pressure
transmitter
EL2271
temperature
transmitter
Condensate
Note:
EL2271 temperature transmitter installed
in the condensate return line is for heat
metering on saturated steam systems
only (Replaces EL2600).

example a 4" flowmeter has a maximum capacity of
8087 kg/h, at a velocity of 48.3 ms. The minimum flow the
flowmeter can read is also shown, in this case 647 kg/h. As
the customers maximum flow is 6 000 kg/h, the effective
turndown can be calculated and is 6 000/647 = 9.27:1.
Note: A DN100 ILVA under the same conditions reads
down to 81 kg/h, which is a turndown of 74:1
Pressure loss DP
(at operating conditions for saturated steam)
DP = C x (Q
m
)² x v
Where: DP = Pressure loss in Pa
C = Constant (values see Table 1)
Q
m
= Flowrate in kg/h
v = Operating specific volume kg/m³ (from steam tables)
Table 1
Flowmeter size Constant C
DN25 1" 1.5 x 10
-1
DN40 1½" 3.3 x 10
-2
DN50 2" 7.8 x 10
-3
DN80 3" 1.9 x 10
-3
DN100 4" 5.3 x 10
-4

2 1.660 134 5.4 75.0 18 251 43 589 71 974 155 2142 268 3691 607 8370 1049 14463
3 2.173 144 5.0 75.0 22 329 51 771 85 1275 187 2804 323 4832 731 10957 1264 18933
4 2.678 152 4.7 75.0 25 405 60 950 99 1571 217 3455 374 5955 848 13503 1465 23333
5 3.177 159 4.5 75.0 29 480 68 1127 112 1864 246 4099 423 7064 960 16019 1659 27681
6 3.673 165 4.3 70.8 32 524 75 1230 124 2035 273 4475 471 7712 1067 17487 1844 30218
7 4.167 171 4.2 66.5 35 558 82 1310 136 2167 300 4766 517 8214 1172 18626 2024 32186
8 4.660 175 4.1 62.9 38 591 90 1386 148 2292 326 5040 561 8687 1273 19698 2199 34038
9 5.162 180 4.0 59.8 41 622 97 1460 160 2415 352 5310 606 9152 1374 20753 2374 35861
10 5.643 184 3.9 57.1 44 650 104 1525 172 2522 378 5547 652 9559 1478 21677 2554 37458
12 6.624 192 3.7 52.4 50 699 117 1641 193 2714 424 5968 731 10287 1657 23326 2863 40307
14 7.603 198 3.6 49.2 55 754 130 1770 214 2928 472 6438 813 11096 1843 25161 3185 43478
16 8.582 204 3.5 46.3 61 801 143 1881 236 3110 519 6840 895 11788 2029 26731 3506 46191
18 9.562 210 3.4 43.9 66 846 156 1985 257 3283 566 7220 975 12443 2212 28217 3822 48758
20 10.544 215 3.4 41.8 71 888 167 2085 277 3448 609 7581 1049 13067 2378 29630 4110 51200
24 12.520 224 3.0 38.4 77 968 180 2271 297 3756 652 8260 1124 14234 2550 32287 4406 55792
28 14.510 232 2.4 35.6 71 1042 164 2445 272 4045 600 8895 1033 15330 2343 34765 4049 60071
32 16.530 239 1.7 33.4 56 1112 133 2609 220 4316 484 9492 834 16360 1892 37098 3270 64105
Flowmeter inside diameter mm 26.7 40.9 52.6 78 102.4 154.2 202.7
VFM3000
Vortex Flowmeter - Saturated Steam Sizing Data
Vortex flowmeters
3.3
3.3.6
TI-P338-13 MI Issue 3
Table 3 Sizing for saturated steam
(Q min, Q max are for flowing conditions i.e. at pipeline pressure)
DIN
Flowmeter size
Steam
DN25 DN40 DN50 DN80 DN100 DN150 DN200

program is strongly recommended. Please contact Spirax Sarco
for any sizing/selection assistance.
Remember, never size on line size, without checking flowrates.
Range limits
(calculation for gases)
The following data must be known in order to calculate the measuring
range:
• Density p
x
or p
n
in kg/m
3
.
• Maximum volumetric flowrate Q
vol
or NQ
vol
in m
3
/h or Nm
3
/h
• Minimum volumetric flowrate Q
vol
or NQ
vol
in m
3
/h or Nm

is specified.
Conversion for flowing density p
x
p
x
= p
n
x
P
x
x

T
n
P
n
x T
x
Pressure drop (DP)
(at flowing conditions for gases)
DP = C x (Q
vol
)
2

x p
x
Where: DP = Pressure drop in Pa
C = Constant (values see Table 1)
Q

Gas density p
n
at normal condition (1.013 bar abs, 0°C dry)
Gas Acetylene Air Ammonia Argon Butane
Carbon Carbon
City gas Ethylene
dioxide monoxide
Density
1.16 1.29 0.771 1.78 2.70 1.98 1.25 0.802 1.25
kg/m
3
Gas Ethane Freon 12 Helium Hydrogen Methane
Natural
Nitrogen Oxygen Propane
gas
Density
1.35 5.39 0.179 0.0899 0.717 0.828 1.25 1.43 2.02
kg/m
3
Example 1
a) Calculate the flowmeter required for a compressed air system
having a maximum flow of 500 Nm
3
/h, and 3 bar g at 35°C.
Imperial pipework is being used and an ANSI meter is required.
b) What will be the pressure drop across the flowmeter?
a) Flowmeter size
Step 1 Calculate flowing density p
x
From Table 2 p

x
= 500 x
1.29
4.53
= 142 m
3
/h
Step 3 Look up the flowmeter size from Table 3 ANSI overleaf
by reading down the density column to the value closest to
the actual flowing density, interpolating if necessary.
In this case the flowing density is 4.53 kg/m³, so we read
across at a density of 4.5 kg/m³ to the Q max value that is
equal to, or more usually greater than, the maximum
requirement.
In this case the best choice is an ANSI 1½" flowmeter
with a Q max of 242 m³/h and a Q min of 19 m³/h. For this
application the turndown is 142/19 = 7.4.
Note: Often the VFM will be smaller than the line size. In
this case it will be necessary to reduce the line size where
the meter is fitted, taking care to achieve the minimum
upstream/downstream lengths of straight pipe. See
TI-P338-12
b) Pressure drop DP
Step 1 DP = C x (Q
vol
)
2

x p
x

6.5 4 53 9 122 20 280 31 447 72 1025 121 1727 268 3820 451 6419
7 4 51 8 118 19 269 31 431 71 987 119 1664 263 3681 443 6185
8 4 48 8 110 19 252 30 403 69 924 116 1556 256 3443 430 5786
9 3 48 8 103 18 236 29 378 67 867 113 1461 250 3233 420 5433
10 3 43 8 99 18 225 29 360 66 826 110 1392 244 3080 411 5175
11 3 41 8 94 17 215 28 344 64 788 107 1327 237 2936 398 4934
12 3 39 7 90 17 206 26 329 61 754 102 1271 226 2811 379 4724
Flowmeter i d Ø mm 28.5 43.1 54.5 82.5 107.1 159.3 206.5
Table 4 Sizing for gases
(Q min, Q max are for flowing conditions. i.e. at pipeline pressure)
DIN
Table 3 Sizing for gases
(Q min, Q max are for flowing conditions. i.e. at pipeline pressure)
ANSI
Flowmeter size
Flowing
1" 1½" 2" 3" 4" 6" 8"
density
V m/s Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max
kg/m³ min max m³/h m³/h m³/h m³/h m³/h m³/h m³/h m³/h m³/h m³/h m³/h m³/h m³/h m³/h
0.5 8 75 17 151 39 355 64 587 141 1290 244 2224 552 5042 954 8713
1 6 75 13 151 30 355 50 587 111 1290 191 2224 433 5042 749 8713
1.225 6 75 12 151 28 355 47 587 103 1290 178 2224 403 5042 697 8713
1.5 6 75 11 151 27 355 44 587 97 1290 167 2224 378 5042 653 8713
2 5 75 10 151 24 355 40 587 88 1290 152 2224 345 5042 596 8713
2.5 5 75 10 151 23 355 38 587 83 1290 142 2224 323 5042 558 8713
3 5 75 9 151 22 355 36 587 79 1290 135 2224 307 5042 530 8713
3.5 4 73 9 146 21 343 34 568 75 1248 130 2151 294 4878 509 8428
4 4 68 9 137 20 321 33 531 73 1167 125 2012 284 4563 491 7884
4.5 4 64 8 129 19 303 32 501 71 1101 122 1897 276 4302 476 7433

Step 1 From Table 2, go to the specified temperature i.e. 20°C,
then read across the row to the size that can handle the
maximum flowrate (Q max) equal to or a little greater than
the maximum flow requirement. Interpolate if necessary.
Note: Sometimes there will be a temptation to select a
flowmeter on line size, but this will usually lead to very poor
turndown and should only be considered when the flow is
steady and the customer is prepared to accept the limited
turndown.
Step 2 Read vertically upwards to select the flowmeter size, in this
example an ANSI 1½" flowmeter with a Q max of 552 l/min
and a Q min of 39 l/min. As the customers maximum flow is
500 l/min the turndown is 500/39 = 12.8.
TI-P338-14
MI Issue 1
VFM3000
Vortex Flowmeter Liquid Sizing Data
Flowmeter size
1" 1½" 2" 3" 4" 6" 8"
Temp Density Sat. pres V ms
Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max
°C kg/m³ bar a
min max l/min l/min l/min l/min l/min l/min l/min l/min l/min l/min l/min l/min l/min l/min
20 998.1 0.02 0.5 7.0 17 235 39 552 65 913 143 2007 247 3459 560 7843 968 13553
30 995.7 0.04 0.5 7.0 17 235 39 552 65 913 143 2007 247 3459 560 7843 968 13553
50 988.2 0.12 0.5 7.0 17 235 39 552 65 913 143 2007 247 3459 560 7843 968 13553
100 958.2 1.01 0.5 7.0 17 235 39 552 65 913 143 2007 247 3459 560 7843 968 13553
150 916.8 4.77 0.5 7.0 17 235 39 552 65 913 143 2007 247 3459 560 7843 968 13553
200 864.7 15.55 0.5 7.0 17 235 39 552 65 913 143 2007 247 3459 560 7843 968 13553
240 813.6 33.49 0.5 7.0 17 235 39 552 65 913 143 2007 247 3459 560 7843 968 13553

x density
Where: DP = Pressure loss in Pa
C = Constant (values see Table 1)
Q
v
= Flowrate in l/min
Density = Flowing density, kg/m
3
from table 2.
Table 1
Flowmeter size Constant C
DN25 1" 1.5 x 10
-1
DN40 1½" 3.3 x 10
-2
DN50 2" 7.8 x 10
-3
DN80 3" 1.9 x 10
-3
DN100 4" 5.3 x 10
-4
DN150 6" 1.6 x 10
-4
DN200 8" 5.9 x 10
-5
Example 2
Calculating pressure loss DP
From Example 1 calculate the pressure loss. The flowmeter
size to be used is 1½", constant C from Table 1 for this size
flowmeter is 3.3 x 10

Flowmeter inside diameter mm 28.5 40.9 54.5 82.5 107.1 159.3 206.5
Table 4 Sizing for liquid
(Q min, Q max are for the following conditions i.e. at pipeline pressure)
DIN water flow l/min
Table 5 Sizing for liquid
(Q min, Q max are for the following conditions i.e. at pipeline pressure)
DIN water flow kg/h
Flowmeter size
DN25 DN40 DN50 DN80 DN100 DN150 DN200
Temp Density Sat. pres V ms
Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max Q min Q max
°C kg/m³ bar a
min max
kg/h kg/h kg/h kg/h kg/h kg/h kg/h kg/h kg/h kg/h kg/h kg/h kg/h kg/h
20 998.1 0.02 0.5 7.0 1146 16046 2360 33045 4191 58676 9604 134454 16185 226591 35807 501298 60170 842373
30 995.7 0.04 0.5 7.0 1143 16007 2355 32966 4181 58535 9581 134130 16146 226047 35721 500093 60025 840348
50 988.2 0.12 0.5 7.0 1135 15886 2337 32718 4150 58094 9509 133120 16025 224344 35452 496326 59573 834018
100 958.2 1.01 0.5 7.0 1100 15404 2266 31724 4024 56330 9220 129079 15538 217533 34376 481258 57764 808699
150 916.8 4.77 0.5 7.0 1053 14739 2168 30354 3850 53896 8822 123502 14867 208134 32890 460465 55268 773758
200 864.7 15.55 0.5 7.0 993 13901 2045 28629 3631 50833 8320 116483 14022 196307 31021 434298 52128 729787
240 813.6 33.49 0.5 7.0 934 13079 1924 26937 3416 47829 7829 109600 13193 184706 29188 408633 49047 686660

Flowmeter inside diameter mm 28.5 40.9 54.5 82.5 107.1 159.3 206.5
Note:Pressure has no appreciable affect
on measured flow.
Note:Pressure has no appreciable affect
on measured flow.