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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

access to the numerous facilities available. (See TIS 8.021).
Note: Wiring between Computer EL2600 Pressure Transmitter and
Conditioning Unit to be provided by user/installer. The SPIRAX
SARCO Steam Meter is designed for use on dry saturated and
superheated steam only. Flow rates are based on a max. flow
velocity of 35m/s. Correct installation is important if accurate and
reliable flow metering is to be achieved. Full Installation Instructions
are supplied with each unit. Basic essentials of good installation are
shown overleaf. Commissioning and Operating Instructions are also
available for each unit.
Performance
Accuracy:
± 2% of measured flow (± 1% of FSD at 50% flow)
Repeatability: ± 0.2%
Turndown: Maximum intermittent turndown 40:1
Average continuous turndown 25:1*
* For continuous operation, a velocity of 35m/s should not be exceeded
to prevent the risk of pipeline erosion.
Electrical wiring
All electrical wiring must be carried out to the appropriate standards.
EL 2600
Pressure Transmitter
M111
Transducer
M 322
Conditioning
Unit
This cable (2m long)
provided by Spirax
Sarco

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.

2. Size the Transducer on capacity rather than line size. Where a
pipe size reduction is necessary, use eccentric reducing sockets.
3. The minimum recommended lengths of straight pipe are 6D
upstream and 3D downstream.
4. Take care to observe the correct direction of flow as denoted by
the arrow on the Transducer body.
5. It is advisable to fit a Check Valve downstream of the Transducer
to avoid possible damage by reverse flow. At least 3 pipe
diameters should remain between the Transducer and the Check
Valve.
6. Do not install the Transducer downstream of a Pressure Reducing
Valve as this may cause inaccuracies and/or possible Transducer
damage.
7. Similarly, do not install the Transducer downstream of a partially
open Stop Valve.
8. Avoid installing the Transducer downstream of an actuated valve
which could cause rapid flow variations which, in turn, could cause
Transducer damage.
Electrical wiring
All electrical wiring must be carried out to the appropriate standards.
How to specify
Steam metering system for measuring mass flow of saturated or
superheated steam comprising a Spring Loaded Variable Area
Transducer, Pressure Transmitter (superheated applications only)
local signal Conditioning Unit and Flow Computer. The system shall
have density and dryness fraction compensation and be capable of
display in energy units. System outputs should be 4-20mA (rate of
flow), pulsed output (totalised flow) and RS232C interface.
M 211G/212G
Computer

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

Transducer
EL26000
Pressure
Transmitter
(Superheat use only)
HI/LO Alarm
Pulsed output
PL2
PL3
PL1
M322
Conditioning
Unit
ö
ý
ø
ö
ý
ø
ö
÷
ý
÷
ø
ö
÷
ý
÷
ø
Mains Input

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

M322 Conditioning unit
M1100 Smart transducer
See other Technical Information sheets (TI's) for the general description
of Spirax Sarco steam meters and for details of the M1100 steam
metering system.
Sizes and pipe connections
DN40, 50, 80 and 100
Flanged BS 4504 PN25, BS 10 Table H, JIS 10, JIS 20, ANSI B16.5
Class 150 and 300
Limiting conditions
Maximum body design conditions PN25
Minimum operating pressure 1 bar g
PMO - Maximum operating pressure 17 bar g
Minimum operating temperature 120°C
TMO - Maximum operating temperature 230°C
Designed for a maximum cold hydraulic test pressure of 37.5 bar
Note: The differential pressure drop across the unit is typically
0.2 bar g at average flowrates.
Less than 0.5 bar g at maximum flow.
Dimensions/weights
(approximate) in mm and kg
PN25 BS 10 H ANSI 150 ANSI 300 JIS 20
Size A A A A A C D E F Weight
DN40 176 175 175 181 176 180 100 76 28 9.5
DN50 180 178 178 184 176 180 100 76 28 10.5
DN80 240 236 240 249 236 220 152 76 76 25.0
DN100 260 263 260 276 260 220 152 76 76 34.5
Materials
Part Material
Body

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

DN50
a) Maximum 955 1155 1320 1470 1600 1720 1830 1940 2035 2130 2225 2310 2395 2475 2555 2630 2705
b) At 35 m/s velocity 280 410 540 660 790 910 1030 1150 1275 1400 1520 1640 1760 1870 1990 2100 2250
c) Minimum 25 28 33 37 40 43 46 48 51 53 56 58 60 62 64 66 68
DN80
a) Maximum 2445 2955 3380 3755 4095 4400 4690 4960 5215 5460 5690 5915 6130 6335 6540 6730 6920
b) At 35 m/s velocity 720 1050 1375 1695 2010 2330 2640 2945 3265 3580 3885 4195 4490 4800 5105 5415 5755
c) Minimum 60 74 84 94 102 110 117 124 130 136 142 148 153 158 163 168 172
DN100
a) Maximum 3820 4615 5285 5870 6395 6880 7330 7750 8150 8530 8895 9240 9575 9900 10215 10515 10815
b) At 35 m/s velocity 1125 1640 2145 2645 3140 3640 4125 4600 5100 5590 6070 6555 7020 7495 7980 8460 9000
c) Minimum 95 115 132 147 160 172 183 194 204 213 222 231 239 247 255 263 270
Flow capacities for saturated steam
Notes on the above Table:-
The steam meter will continue to give a reading up to the maximum value in the above Table. However, the steam flow velocities at these
maximum flowrates could be extremely high (up to 120 m/s at the low pressures and up to 42 m/s at the high pressures) and could lead to
serious erosion damage both to the transducer and to the associated pipework and fittings. It is not recommended that a steam meter is
selected to operate at flowrates continuously resulting from a velocity above 35 m/s.
Turndown of the transducer is defined as the maximum flow divided by the minimum flow: Using the maximum figures from the above Table,
the turndown is 40:1 throughout the size and pressure range. However, based on the recommended maximum velocity of 35 m/s, the turndown
available will vary from 12:1 at 1 bar g up to 33:1 at 17 bar g. The average continuous turndown of the flowmeter is, therefore 25:1
3.14 x 0.08 x 0.08 x 35 x 3600
4 x 0.3520
Q = = 1802 kg/h
Flow capacities for superheated steam
In general terms, the flow capacity for the transducer is calculated
using the following equation:
Where:- Q = Capacity in kg/h
A = Pipe cross sectional area in sq.m.
V = Flow velocity in m/s

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

MI Issue 5
Gilflo ILVA Flowmeter
Description
The Gilflo ILVA flowmeter operates on the spring loaded variable
area principle and produces a differential pressure related to the
rate of flow. It can be used with most industrial fluids, gases and
both saturated and superheated steam.
Sizes and pipe connections
DN50, 80, 100, 150 and 200
Suitable for fitting between the following flanges
BS 4504 PN16, 25, 40.
BS 10 Table H.
ANSI B 16.5 class 150, 300, 600.
Japanese Industrial Standard JIS 20.
Korean Standard KS 20.
The Gilflo ILVA flowmeter should be installed in pipework
manufactured to BS 1600 or ANSI/ASME B36.10 Schedule 40.
For different pipe standards/schedules, if the flowmeter is being
operated at the extreme of its published maximum range, downstream
spool pieces manufactured from BS 1600 or ANSI/ASME B36.10
Schedule 40 should be used.
If this is not possible, please contact Spirax Sarco Ltd.
Limiting conditions
The maximum pressure and temperature limitations are shown
below. Minimum operating pressure 0.6 bar g. Maximum viscosity
30 centipoise.
Operating range
The product must not be used in this region.
Materials of construction
Body Stainless steel S.316

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

400
450
Temperature °C
Pressure bar g
Steam
saturation
curve
How to order
DN150 Spirax Sarco Gilflo ILVA flowmeter for installation between
flanges to BS 4504 PN40. Body material 316 stainless steel. Flow
medium saturated steam at 10 bar g, maximum flow 8,000 kg/h.
For a general description of the Gilflo ILVA flowmetering system,
see TI-P337-06 which also gives details of associated equipment.
ISO 9001
Gilflo flowmeters
3.2
3.2.2
TI-P337-05 MI Issue 5
Dimensions/weights
(approximate) in mm and kg
Size ABCDEWeight
DN50 35 63 140 103 17.5 2.0
DN80 45 78 150 138 22.5 3.9
DN100 60 103 205 162 37.5 8.3
DN150 75 134 300 218 37.5 14.2
DN200 85 161 360 273 42.5 23.6
Note:- Pressure tappings are threaded ¼" NPT
Note: Pressure tappings
(2 off located at 180°)
Mass flow units Volumetric units

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

M
(standard Q
E
= D
S

x
P
F

x
T
S
Q
E
= Q
S
D
S

x
P
S

x
T
F
conditions) 1000 P
S
T

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

Q
S
= Max gas flowrate = 1.033 kg/cm² a
at standard conditions (l/min) = 14.70 psi a
Q
F
= Max gas flowrate P
F
= Flowing pressure in
at flow conditions (l/min) same units as P
s
SG = Specific gravity T
S
= 273°K
D
S
= Density of gas at T
F
= Flowing temperature (°K)
standard conditions (kg/m³)(°C + 273 = °K)
2. Using the value of Q
E
as determined in 1, select the correct size
of Gilflo ILVA meter using table 2. In practice, it will often be the line
size that determines the choice of meter.
Installation
A separate installation booklet is supplied with each Gilflo ILVA
flowmeter. The following main points are given here for guidance:
1. The Gilflo ILVA should be mounted with a minimum of 6 straight
pipe diameters upstream and 3 downstream. No valves, fittings or

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

l/min. Wg
DN50 149 200
DN80 585 200
DN100 1 800 200
DN150 2 900 200
DN200 5 700 200
Example Determine which Gilflo pipeline unit is required to measure
the flow of compressed air when:
1: Estimated maximum rate of flow = 500 s m³/h at 7 bar g and 20°C
Note: Standard conditions = 1.013 bar a, 0°C giving a standard
density of 1.29 kg/m³
2: Calculate Q
E
from Q
E
= Q
S
Ö
D
S
x
P
S
x
T
F
1000 P
F
T
S

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

DN200
Maximum flow 11492 15905 19252 22061 25674 27816 30746 35101 39002 42587 49098
Minimum flow 115 159 193 221 257 278 307 351 390 426 491
So a DN50 ILVA is recommended.
Note: 1m
3
/h = 16.667 l/min
D
➤
A
B
C
E
Flowmetering
3.2
3.2.3
TI-P337-06
MI Issue 3
Gilflo ILVA Flowmeters
System Overview
Description
The Spirax Sarco Gilflo ILVA flowmetering system consists of two
major parts:
1. The Gilflo ILVA pipeline unit. This is installed in the line where
the flow is to be measured. Using impulse pipework, this is
connected to:
2. The M610 DP transmitter assembly. This measures the
differential pressure across the Gilflo ILVA pipeline unit and
converts it to a 4- 20 mA output signal. This output signal can
be used in a number of ways:

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.

Full wiring interconnection details are included with the equipment.
Associated equipment
Item Description Technical literature
M610 DP transmitter assembly TI-P335-10
Gilflo ILVA Pipeline unit TI-P337-05
EL2271 Temperature transmitter TI-P322-01
EL2600 Pressure transmitter TI-P322-02
M700 Display unit TI-P335-09
F50C Isolation valve TI-P170-01
M240G Steam flow computer TI-P330-48
M250G Gas flow computer TI-P330-53
EL2600
pressure
transmitter
F50C isolation valves
M610
DP transmitter assembly
(for gas applications the
M610 DP transmitter is
mounted above the
Gilflo ILVA)
EMS/
BEMS
M700
display unit
M240G
flow computer
(steam)
M250G
flow computer

(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.

4. Take care to ensure the correct direction of flow as indicated by the arrow on the flowmeter body.
5. Take care to avoid reverse flow through the flowmeter.
6. Avoid installing the flowmeter downstream of a pressure reducing valve (especially on steam systems) as this may cause inaccurate
readings. Similarly, avoid installing the flowmeter downstream of a partially open valve.
7. Remember that actuated valves may cause rapid pressure fluctuations which could cause damage.
8. On steam or liquid systems, the M610 DP transmitter assembly is mounted below the flowmeter. Take care to ensure that all impulse
lines remain full to prevent damage to the DP transmitter through contact with steam or high temperature liquid.
9. For steam applications, care should be taken to ensure adequate line drainage, trapping etc., so as to avoid condensate slugs
impacting the flowmeter. Where practicable, steam separators should be fitted. These should be drained using a float trap set.
10. For gas applications, the M610 DP transmitter assembly is installed above the pipework. Ensure that the impulse lines allow
free drainage of moisture away from the DP transmitter and back into the pipeline.
Flowmetering
3.2
3.2.5
TI-P337-09
MI Issue 1
Gilflo Flowmeters - 'Spool' Pipeline Unit
Description
The Gilflo 'Spool' flowmeter is installed in the pipeline and produces
a differential pressure which is related to the rate of flow. It can be
used with most industrial fluids, gases and both saturated and
superheated steam.
Sizes and pipe connections
DN80, 100, 150, 200 and 300
Flanges available to BS 4504 PN40 and ANSI B.16.5 class 300
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
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

0
100
200
300
400
450
0
Temperature °C
Pressure bar g
AB
Steam
saturation
curve
A
B
Note:
DN300 flowmeter incorporates an additional shaft support together
with a revised spring location.
ISO 9001
Gilflo flowmeters
3.2
3.2.6
Maintenance
There are no user serviceable parts within the Gilflo 'Spool' flowmeter.
Mechanical checks to confirm correct operation are described in the
manual 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 'Spool' flowmeter
In order to determine the flow capacity of a Gilflo 'Spool' 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
L

SG

SG
Gases and
steam
Q
E
= M

1 000
Q
E
= Q
F

D

F
actual flow D
F
1 000
conditions
Gases
Q
E

=



M
Q
E
= Q
S

D
S


x
P
S

x
T
F

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

= Maximum liquid flowrate (litres / min)
Q
S
= Maximum gas flowrate at standard conditions (litres / min)
Q
F
= Maximum gas flowrate at actual flow conditions (litres / min)
SG = Specific gravity
D
S
= Density of gas at standard conditions (kg / m
3
)
D
F
= Density of gas at actual flow conditions (kg / m
3
)
P
S
= Standard pressure = 1
.
013 bar a
=1
.
033 kg/cm
2
a
=14
.

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

(approximate) in mm and kg
Size A B Weight
DN80 327 89 17
DN100 543 114 37
DN150 716 168 76
DN200 797 219 87
DN300 990 324 109
H.P. and L.P. pressure tappings are threaded ¼" NPT (female).
Installation
A separate installation booklet is supplied with each Gilflo 'Spool'
flowmeter. The following main points are given for guidance:-
1. The Gilflo flowmeter should be installed with a minimum of
6 straight pipe diameters upstream and 3 downstream. No
valves, fittings or cross sectional changes are permitted
within these pipe lengths. Where an increase in pipe diameter is
necessary upstream of a Gilflo flowmeter, the length of straight
pipe should be increased to 12 diameters. Similarily, where a
Gilflo flowmeter is installed downstream of two 90° bends in
two planes, a pressure reducing valve or a partially open valve,
12 pipe diameters should be allowed.
2. The Gilflo flowmeter should normally be mounted horizontally.
Vertical installation (with flow vertically downward) is also
permissible and must be specified at the time of ordering. Ensure
flow is in correct direction and avoid reverse flow.
3. For steam applications, good basic steam engineering practice
should be followed:-
• Ensure all pipework is adequately lagged.
• Ensure correct line drainage through adequate trapping.
• Where practicable, fit a steam separator upstream of the
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.
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

3.2
3.2.7
TI-P337-08
MI Issue 2
Gilflo 'B' Flowmeter
Pipeline Unit
Low 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
0
100
200
300
400
450
0
Temperature °C
Pressure bar g
AB
Steam
saturation
curve
A
B
Note:
DN200, 250, 300 and 400 flowmeters
incorporate an additional shaft support

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

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
plate flowmeter. For correct operation a configured M700 display
must always be installed with its allocated flowmeter. Labels on the
packaging give the serial numbers of the matched products.
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 'B', it is necessary
to calculate the equivalent water flowrate (Q
E
). See under section
"Sizing the Gilflo 'B' flowmeter".
Description
The Gilflo 'B' flowmeter is installed in the pipeline and produces a
differential pressure which is related to the rate of flow. It can be
used with most industrial fluids, gases and both saturated and
superheated steam.
*
ISO 9001
Cert. No. LRQ 0963008
Gilflo flowmeters
3.2
3.2.8
Table 2
Gilflo 'B' 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
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

DN200 990 324 123
DN250 1 458 406 257
DN300 1 599 457 340
DN400* 1 995 610 900
H.P. and L.P. pressure tappings are threaded ¼" NPT (female).
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.
Installation
Installation and Maintenance Instructions are supplied with each
Gilflo 'B' flowmeter. The following main points are given for guidance:-
1. The Gilflo flowmeter should be installed with a minimum of
6 straight pipe diameters upstream and 3 downstream. No
valves, fittings or cross sectional changes are permitted
within these pipe lengths. Where an increase in pipe diameter is
necessary upstream of a Gilflo flowmeter, the length of straight
pipe should be increased to 12 diameters. Similarily, where a
Gilflo flowmeter is installed downstream of two 90° bends in
two planes, a pressure reducing valve or a partially open valve,
12 pipe diameters should be allowed.
2. The Gilflo flowmeter should normally be mounted horizontally.
Vertical installation (with flow vertically downward) is also
permissible and must be specified at the time of ordering. Ensure
flow is in the correct direction and avoid reverse flow.
3. For steam applications, good basic steam engineering practice
should be followed:
- Ensure all pipework is adequately lagged.
- Ensure correct line drainage through adequate trapping.
- Where practicable, fit a steam separator upstream of the

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

L

SG

SG
Gases and
steam
Q
E
= m

1 000
Q
E
= Q
F

D
F
actual flow D
F
1 000
conditions
Gases
Q
E

=

m
Q
E
= Q
S

D
S


x
P
S

x
T
F
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
= Maximum liquid flowrate (litres/min)
Q
S
= Maximum gas flowrate at standard conditions (litres/min)
Q
F
= Maximum gas flowrate at actual flow conditions (litres/min)
SG = Specific gravity
D
S
= Density of gas at standard conditions (kg/m
3

)
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

Size
Q
E
equivalent water flowrate litres/min
Gilflo 'B' flowmeter
DN50 355
DN80 1 165
DN100 1 870
DN150 4 550
DN200 8 085
DN250 11 120
DN300 19 305
DN400 31 360
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.
TI-P337-08 MI Issue 2
Flowmetering
3.2
3.2.9
Gilflo flowmeters
3.2
3.2.10
TI-P337-09 MI Issue 1
TI-S41-10
MI Issue 6
Gilflo Flowmeters
System Overview

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

plate flowmeter. For correct operation a configured M700 display
must always be installed with its allocated flowmeter. Labels on the
packaging give the serial numbers of the matched products.
Installation
Care must be taken to meet all the requirements of the Installation
and Maintenance Instructions, which are provided with the equipment.
Installation points to watch:
1. Ensure all pipework is adequately supported and properly aligned.
2. The Gilflo pipeline unit should be selected on capacity rather
than line size. Where pipe size reduction on steam systems is
necessary, use eccentric reducers to avoid waterlogging.
3. The minimum recommended lengths of straight pipe are 6D
upstream and 3D downstream.
4. Take care to ensure the correct direction of flow as indicated by
the arrow on the flowmeter body.
5. Take precautions to avoid reverse flow through the flowmeter.
6. Avoid installing the flowmeter downstream of a pressure reducing
valve (especially on steam systems) as this may cause
inaccuracies and/or possible damage. Similarly avoid installing
the flowmeter downstream of a partially open valve.
7. Remember that actuated valves may cause rapid pressure
fluctuations which could cause damage.
8. On steam or liquid systems take care to ensure that all impulse
lines remain full to prevent damage to the DP transmitter through
contact with steam or high temperature liquid.
9. For steam applications, care should be taken to ensure adequate
line drainage, trapping etc., to avoid condensate slugs impacting
the flowmeter. Where practicable, steam separators should be
fitted. These should be drained using a float trap set.
10.For gas applications ensure that the DP cell and impulse lines

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

flow computer (steam)
EL2600
pressure
transmitter
EL2271
temperature
transmitter
Outputs,
alarms, etc.
How to order
For details of how to specify system components refer to the relevant
TI document.
Associated equipment
Item Description
EL2271 Temperature transmitter
EL2600 Pressure transmitter
F50C Isolation valve
Gilflo 'B' Pipeline unit
Gilflo 'Spool' Pipeline unit
M240G Steam flow computer
M250G Gas flow computer
M610 DP transmitter assembly
M640 Steam mass flow transmitter
M700 Display unit
Note: This drawing is schematic only, please
see Installation and Maintenance Instructions
for specific installation information.
Flowmetering
3.3
3.3.1

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.

Limiting conditions
Operating temperature limits -20 to + 240°C
EEX ib IIC T2 .... T6 model
STD model
Operating pressure limits
40 bar g or to mating flanges
(see range availability)
Performance
Accuracy ± 1% of measured flow (Re> 20 000)
Repeatability ± 0.5% of measured flow
Turndown Typically 12:1 based on practical velocities
0
-20
-25
-20
0
240
10
20
30
40
50
60
40
80
120
160
200
Ambient temperature °C
Fluid temperature °C

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

Dimensions/weights
(approximate) in mm and kg
Wafer version
The standard design is to fit schedule 40 imperial pipe, with centring
bolts and sleeves supplied for PN40 or ANSI 300 flanges.
The design is also suitable for mounting between PN10, 16, 25, 64,
100, and ANSI 150 flanges, provided care is taken to centre the
flowmeter. Gaskets are not included and dimension 'A' does not
include a gasket allowance.
Wafer dimensions
Size
ABCD
Weight
25 mm 1" 65 293 69 26.7 3.8
40 mm 1½" 65 314 89 40.9 4.6
50 mm 2" 65 323 100 52.6 4.9
80 mm 3" 65 361 136 78.0 6.8
100 mm 4" 80 381 159 102.4 7.5
Capacities
Refer to the relevant sizing data: (Steam) TI-P338-13
(Liquid) TI-P338-14
(Gas) TI-P338-15
Minimum flow velocity at various densities for gases and
saturated steam
Installation
A separate installation booklet is supplied with each VFM3000. For
wafer type flowmeters, installation kits consisting of nuts, bolts,
washers and centring sleeves are supplied (PN40 or ANSI 300
only).
1. The inside diameter of the flowmeter should be the same as

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,

maintenance and trouble shooting.
How to order
Example: 1 off 1½'' VFM3000 vortex flowmeter, wafer version
complete with PN40 installation kit for use on compressed air with
line conditions of; maximum normalised flowrate 600 Nm³/h,
pressure 2 bar g and temperature 15°C.
D
B
ø122
204
PG16
156
A
B
ø122
204
D
Flanged version
Flanged flowmeters are available to order. DIN 2501 (PN40) and
ANSI B16.5 (class 300) details are given below.
Note: Bolts and gaskets are not supplied and dimension 'A' does
not include a gasket allowance.
Pressure
Flanged dimensions
Size rating of Weight
flanges A B C D
DN25 PN40 250 317 115 28.5 6.3
1" ANSI 300 250 320 124 26.7 6.3
DN40 PN40 250 344 150 43.1 9.8
1½" ANSI 300 250 347 155 40.9 10.6

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

Flowing velocity m/s
ä
ä
C
ä
C
ä
PG16
156
A
ä
ä
C
ä
ä
C
Flowmetering
3.3
3.3.3
Vortex flowmeters
3.3
3.3.4
TI-P338-20
MI Issue 1
VFM3000
Vortex Flowmeters - System Overview
Description
The Spirax Sarco VFM3000 vortex flowmetering system consists of
2 major parts:-
1. The VFM3000 vortex flowmeter. This is installed in the line

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:-

1. Ensure all pipework is adequately supported and properly
aligned.
2. The vortex flowmeter should be sized on capacity rather than
line size.
3. The minimum recommended lengths of straight pipe are 20 D
upstream and 10 D downstream.
4. Take care to ensure the correct direction of flow as indicated by
the arrow on the flowmeter body.
5. Avoid installing the flowmeter downstream of a pressure reducing
valve (especially on steam systems) as this may cause
inaccuracies. Similarly avoid installing the flowmeter downstream
of a partially open valve.
6. For steam applications, care should be taken to ensure adequate
line drainage and trapping etc. so as to avoid condensate slugs
impacting the flowmeter. Where practicable, steam separators
should be fitted. These should be drained using a float trap set.
Electrical wiring
All electrical wiring must be carried out to the appropriate standards.
Full wiring interconnection details are included with the equipment.
How to specify
For details of how to specify each part of your chosen system refer
to individual TI’s listed in the associated equipment section.
Associated equipment
EL2271 Temperature transmitter TI-P322-01
EL2600 Pressure transmitter TI-P322-02
M700 Display unit TI-P335-09
M240G Steam flow computer TI-P330-48
M250G Gas flow computer TI-P336-03
VFM3000 Vortex flowmeter TI-P338-12
VFM3000

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).

EL2271
temperature
transmitter
➧
➧
Outputs,
alarms, etc
ISO 9001
Flowmetering
3.3
3.3.5
TI-P338-13
MI Issue 3
General guidelines
The following procedure (Example 1) may be used when the Spirax
Sarco vortex sizing program is not available. However the use of the
program is strongly recommended. Please contact Spirax
Sarco for any sizing/selection assistance.
Remember, never size on line size, without checking flowrates.
Example 1
calculating the size of flowmeter
The flowmeter is required to measure saturated steam at 10 bar g
to a maximum flow of 6 000 kg/h. Imperial pipe sizes are being used
and ANSI flanges have been specified.
Step 1 From Table 2, go to the specified pressure i.e. 10 bar g,
then read across the column to the size that can handle the
maximum flowrate. Interpolate if necessary and be sure to
use the lowest pressure, allowing for possible distribution
losses and boiler droop at high demand.
Step 2 Read vertically upwards to select the flowmeter size, in this

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

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.
DP = C x (Q
m
)² x v
From Example 1, the flowmeter size to be used was 4", constant C
from Table 1 for this size flowmeter is 5.3 x 10
-4
and v from steam
tables is 0.177 kg/m³
DP = 5.3 x 10
-4
x 6 000² x 0.177
= 3 377 Pa
= 33.8 mbar
Table 2 Sizing for saturated steam
(Q min, Q max are for flowing conditions i.e. at pipeline pressure)
ANSI
Flowmeter size
Steam
1" 1½" 2" 3" 4" 6" 8"
pressure Density Temp 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 Qmax
bar g kg/m³ °C 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
1 1.135 120 6.2 75.0 14 114 33 402 55 605 120 1464 208 2524 471 5723 814 9890

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

pressure Density Temp 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
bar g kg/m³ °C 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
1 1.135 120 6.2 75.0 16 195 36 447 59 714 135 1638 227 2761 502 6108 844 10264
2 1.660 134 5.4 75.0 21 286 43 589 76 1046 174 2396 293 4038 648 8933 1089 15011
3 2.173 144 5.0 75.0 25 374 51 771 91 1369 209 3136 353 5286 781 11694 1312 19650
4 2.678 152 4.7 75.0 29 461 60 950 106 1687 243 3865 409 6514 905 14411 1521 24216
5 3.177 159 4.5 75.0 33 547 68 1127 120 2001 275 4585 463 7728 1024 17096 1721 28728
6 3.673 165 4.3 70.8 36 597 75 1230 133 2184 305 5006 515 8436 1139 18663 1914 31362
7 4.167 171 4.2 66.5 40 636 82 1310 146 2327 335 5332 565 8985 1250 19879 2101 33404
8 4.660 175 4.1 62.9 43 673 90 1386 159 2461 364 5639 614 9502 1358 21023 2282 35326
9 5.162 180 4.0 59.8 47 709 97 1460 172 2592 393 5940 663 10011 1466 22148 2464 37218
10 5.643 184 3.9 57.1 50 740 104 1525 185 2708 423 6205 713 10457 1577 23135 2651 38875
12 6.624 192 3.7 52.4 57 797 117 1641 207 2914 474 6677 799 11252 1768 24894 2971 41832
14 7.603 198 3.6 49.2 63 860 130 1770 230 3143 528 7202 889 12138 1967 26853 3306 45124
16 8.582 204 3.5 46.3 69 913 143 1881 253 3339 581 7652 979 12895 2166 28529 - -
18 9.562 210 3.4 43.9 76 964 156 1985 276 3525 633 8077 1067 13612 2361 30114 - -
20 10.544 215 3.4 41.8 81 1012 167 2085 297 3701 681 8481 1147 14294 2538 31622 - -
24 12.520 224 3.0 38.4 87 1102 199 2522 318 4033 730 9242 1230 15575 2721 34458 - -
28 14.510 232 2.4 35.6 80 1187 183 2715 292 4342 670 9951 1130 16770 2500 37101 - -
32 16.530 239 1.7 33.4 65 1267 147 2898 236 4634 541 10619 913 17896 2020 39593 - -
Flowmeter inside diameter mm 28.5 40.9 54.5 82.5 107.1 159.3 206.5
Flowmetering
3.3
3.3.7
VFM3000
Vortex Flowmeter - Gas Sizing Data
General guidelines
The following procedure may be used when the Spirax Sarco
vortex sizing program is not available. However the use of the

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

3
/h
• ANSI or DIN pipe connections
Note: ANSI wafer meters may be used with DIN flanges.
Where: p
x
, p
n
= Density of the gas in kg/m
3
at flowing and normal
conditions respectively.
P
x
,P
n
= Pressure of the gas in absolute units at flowing
and normal conditions respectively.
T
x
,T
n
= Temperature of the gas in ° Kelvin at flowing and
normal conditions respectively. (° K = °C + 273)
Note: P
n
and T
n
are only needed if NQ
vol

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

vol
= Actual flowrate in m
3
/h
NQ
vol
= Volumetric flow at normalised conditions in Nm³/h
p
x
= Flowing density in kg/m
3
Table 1
Meter 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
TI-P338-15
MI Issue 3
Table 2

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

n
for air = 1.29 kg/m
3
.
p
x
= 1.29 x
4.013 x 273
1.013 x 308
= 4.53 kg/m
3
Step 2 Calculate actual volumetric flow (m
3
/h) at flowing
conditions from normalised flow (N m
3
/h)
Q
vol
(m
3
/h) = NQ
vol
(Nm
3
/h) x
p
n

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

= 3.3 x 10
-2

(from Table 1) x (142)
2
x 4.53
= 3 014.3 Pa
= 30.1 mbar
Vortex flowmeters
3.3
3.3.8
TI-P338-15 MI Issue 3
Flowmeter size
Flowing
DN25 DN40 DN50 DN80 DN100 DN150 DN200
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 19 172 43 394 69 630 158 1443 266 2432 590 5381 991 9043
1 6 75 15 172 34 394 54 630 124 1443 209 2432 462 5381 777 9043
1.225 6 75 14 172 32 394 51 630 116 1443 195 2432 432 5381 726 9043
1.5 6 75 13 172 30 394 47 630 108 1443 182 2432 403 5381 678 9043
2 5 75 12 172 27 394 43 630 99 1443 166 2432 368 5381 619 9043
2.5 5 75 11 172 25 394 40 630 92 1443 156 2432 345 5381 579 9043
3 5 75 10 172 24 394 38 630 88 1443 148 2432 328 5381 550 9043
3.5 4 73 10 167 23 381 37 609 84 1396 142 2353 314 5205 528 8747
4 4 68 10 156 22 356 35 570 81 1306 137 2201 303 4869 510 8182
4.5 4 64 9 147 22 336 34 537 79 1231 133 2075 294 4591 494 7714
5 4 61 9 139 21 319 34 510 77 1168 129 1969 286 4355 481 7319
5.5 4 58 9 133 20 304 33 486 75 1114 126 1877 279 4153 469 6978
6 4 55 9 127 20 291 32 465 73 1066 124 1797 273 3976 459 6681

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

5 4 61 8 122 19 287 31 475 69 1044 118 1800 268 4081 463 7052
5.5 4 58 8 117 18 274 30 453 67 996 115 1716 262 3891 452 6724
6 4 55 8 112 18 262 30 433 66 953 113 1643 256 3725 443 6437
6.5 4 53 8 107 18 252 29 416 64 916 111 1578 251 3579 434 6185
7 4 51 7 103 17 243 29 401 63 882 109 1521 247 3449 427 5960
8 4 48 7 97 17 227 28 375 61 826 106 1423 240 3226 415 5575
9 3 48 7 90 16 213 27 352 60 775 103 1336 234 3029 405 5235
10 3 43 7 87 16 203 27 336 59 738 101 1273 229 2886 396 4986
11 3 41 7 82 16 194 26 320 57 704 98 1213 222 2751 384 4754
12 3 39 6 79 15 185 25 307 54 674 93 1162 211 2634 365 4552
Flowmeter i d Ø mm 26.7 40.9 52.6 78 102.4 154.2 202.7
Flowmetering
3.3
3.3.9
General guidelines
The following procedure (Example 1) may be used when the Spirax
Sarco vortex sizing program is not available. However the use of
the program is strongly recommended. Please contact Spirax
Sarco for any sizing/selection assistance.
Remember, never size on line size, without checking flowrates.
Example 1
calculating the size of flowmeter
The meter is required to measure water at up to 500 l/min. The
temperature is 20°C. ANSI is specified.
Note: Pressure does not affect density or the measured volumetric
flow. However temperature is important when it comes to mass
flow, as is shown. Also it is essential that there is no cavitation
across the bluff body. To avoid this possibility ensure that the
pressure at the flowmeter is at least 0.5 bar greater than the
saturation pressure shown in the Tables.

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

Flowmeter inside diameter mm 26.7 40.9 52.6 78.0 102.4 154.2 202.7
Table 3 Sizing for liquid
(Q min, Q max are for the following conditions i.e. at pipeline pressure)
ANSI water flow kg/h
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 Qmax 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 1006 14083 2360 33045 3904 54656 8585 120186 14796 207140 33551 469714 57975 811656
30 995.7 0.04 0.5 7.0 1003 14049 2355 32966 3895 54524 8564 119897 14760 206642 33470 468584 57836 809704
50 988.2 0.12 0.5 7.0 996 13943 2337 32718 3865 54114 8500 118994 14649 205086 33218 465055 57400 803605
100 958.2 1.01 0.5 7.0 966 13520 2266 31724 3748 52471 8242 115381 14204 198860 32210 450936 55658 779209
150 916.8 4.77 0.5 7.0 924 12936 2168 30354 3586 50204 7885 110396 13591 190268 30818 431453 53253 745543
200 864.7 15.55 0.5 7.0 871 12201 2045 28629 3382 47351 7437 104123 12818 179455 29067 406935 50227 703175
240 813.6 33.49 0.5 7.0 820 11480 1924 26937 3182 44553 6998 97969 12061 168850 27349 382887 47259 661620

Flowmeter inside diameter mm 26.7 40.9 52.6 78.0 102.4 154.2 202.7
Table 2 Sizing for liquid
(Q min, Q max are for the following conditions i.e. at pipeline pressure)
ANSI water flow l/min
Note:Pressure has no appreciable affect
on measured flow.
Pressure loss DP
DP = C x (Q
v
)² x (60/1 000)
2

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

-2
and density from Table 2 is 998.1 kg/m³
DP = 3.3 x 10
-2
x (500)
2
x (60/1 000)² x 998.1
= 29 644 Pa
= 296 mbar
Note:Pressure has no appreciable affect
on measured flow.
ISO 9001
Cert. No. LRQ 0963008
Vortex flowmeters
3.3
3.3.10
TI-P338-14 MI Issue 1
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 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 19 268 39 552 70 980 160 2245 270 3784 598 8371 1005 14066
30 995.7 0.04 0.5 7.0 19 268 39 552 70 980 160 2245 270 3784 598 8371 1005 14066
50 988.2 0.12 0.5 7.0 19 268 39 552 70 980 160 2245 270 3784 598 8371 1005 14066
100 958.2 1.01 0.5 7.0 19 268 39 552 70 980 160 2245 270 3784 598 8371 1005 14066
150 916.8 4.77 0.5 7.0 19 268 39 552 70 980 160 2245 270 3784 598 8371 1005 14066
200 864.7 15.55 0.5 7.0 19 268 39 552 70 980 160 2245 270 3784 598 8371 1005 14066
240 813.6 33.49 0.5 7.0 19 268 39 552 70 980 160 2245 270 3784 598 8371 1005 14066

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.