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Ellipse® Pitot Tube Meter
ASF Annular Flanged Steam Meter
PTT-UM-00522-EN-02 (April 2014)
User Manual
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Ellipse® Pitot Tube Meter, ASF Annular Flanged Steam Meter
CONTENTS
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pipe Orientation and Sensor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
For General Steam Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Instructions, Single Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation Instructions, Double Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical Installation with Dierential Pressure Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Location Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Flow Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
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INTRODUCTION
Impac
sensing holes
The patented Preso elliptical design outperforms and provides greater
accuracy than traditional differential pressure flow measurement devices. This
differential pressure flow meter is designed with a series of ports facing the
upstream velocity pressures, as well as flow sensing ports strategically located
ahead of the trailing edge flow separation.
The multi-ported, self-averaging flow element consists of an elliptical shape
with two independent flow sensing chambers. The impact velocity sensing
holes (high pressure) are located along the leading edge and the true static
sensing holes (low pressure) are on the exterior probe side. Model ASF comes
with instrument shutoff valves with provisions to accept a transmitter or direct
indicating meter.
User Manual
True static
sensing holes
t velocity
Figure 1: ASF pressure sensing holes
SPECIFICATIONS
Applications Steam
Pipe Sizes 2…48 inches (50…1220 mm)
Pressure Vary per flange ratings
Temperature Vary per flange ratings
Accuracy ±0.75% of reading
Turndown Ratio 17:1 with no vacuum effect
Standard Components T-type head, 316 SS 1/2" FNPT connection
CS compression fitting with SS ferrule
CS 3000 lb weld fitting, ASTM A105
316/316L SS Ellipse sensor
316 SS ID tag with wire
Reynolds Number Greater than 75,000 maintains most accurate flow measurements
Less than 75,000 consult factory for estimated results
Resonance If greater than 0.8, use double support per ASME PTC 19.3.
Table 1: ASF specifications
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W
Ellipse® Pitot Tube Meter, ASF Annular Flanged Steam Meter
PIPE ORIENTATION AND SENSOR MOUNTING
FLOW
Field Weld
Preferred installation
Figure 2: Horizontal pipe installation
O
F
L
W
Field Weld
Figure 3: Vertical pipe installation
F
L
OR
O
OTE:N Illustration represents installation for downward flow.
Allowable plane of installation
O
F
L
OR
W
O
F
L
W
For General Steam Applications
OTE:N Instrument valves should be mounted at the same elevation to maintain equal condensation levels.
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User Manual
INSTALLATION INSTRUCTIONS, SINGLE SUPPORT
1. Choose the proper location to install the ASF Ellipse using AGA/ASME standards (or equivalent). See "Location Instructions"
on page 7.
2. Grind the surface of the pipe where the ASF Ellipse is to be inserted to provide a clean area for welding.
3. Drill a hole through the pipe wall according to Table 2.
Model / Sensor Weld Connector Drill Bit
ASF (7/8") 1" 1-1/8"
ASF1 (1-1/4") 1-1/4" 1-3/8"
ASF2 (2-1/4") 3" 2-3/4"
Table 2: Single support drill bit size
4. Deburr the hole just drilled, especially on the inside of the pipe.
5. Weld the mating ange assembly to the pipe. Align the holes. Allow 1/16" weld gap between the mounting ange and
the pipe.
6. Install the gasket and place the ASF Ellipse sensor into the pipe.
7. While holding the ASF Ellipse in its fully inserted position, align the arrow on the sensor head with the direction of ow.
See Figure 4.
FLOW
Field Weld
Figure 4: Sensor alignment
8. Tighten all of the bolts on the ange and assemble all the parts that make the instrument head.
9. Connect the 1/2" tubing to the connections on the forged cross components. Connect these lines to a three-valve
manifold transmitter.
10. Verify that the instrument valves are FULLY CLOSED. Remove the 1/2" plugs from the top and side ports of the two forged
cross tees.
11. Slowly pour water into the top ports of each forged cross tee until the system is full. Water will ow out of the side ports of
both crosses.
12. Reinstall the 1/2" plugs into the top and side ports. Ensure that they are secure. Fully open the two gate valves.
13. Allow condensation levels to stabilize for 30 minutes before taking an instrument reading.
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Ellipse® Pitot Tube Meter, ASF Annular Flanged Steam Meter
INSTALLATION INSTRUCTIONS, DOUBLE SUPPORT
1. Follow steps 1 through 4 in "Installation Instructions, Single Support" on page 5. At 180° from and on the same plane
as the previously drilled hole, grind the surface of the pipe to provide a clean area for welding. Drill a hole and deburr,
especially on the inside of the pipe. Size the hole used for the double support according to Table 3.
Model / Sensor Weld Connector Drill Bit
ASF (7/8") 1/2" 1/2"
ASF1 (1-1/4") 1" 7/8"
ASF2 (2-1/4") 3" 2-3/4"
Table 3: Double support drill bit size
2. Weld the double support weld-o-let, making sure that it is centered with the drilled hole (1/16" weld gap recommended).
3. Install the ASF Ellipse sensor through the two holes. Make sure that the double support pin passes through the guide ring.
See Figure 5.
Ellipse Sensor
Double Support Pin
Guide Ring
Figure 5: Double support pin
4. While holding the ASF Ellipse in its fully inserted position, align the sensor head with the direction of ow as in step 7,
"Installation Instructions, Single Support" on page 5.
5. Check that the ASF Ellipse is in the correct orientation and spans the inside of the pipe. Tighten the compression nut
manually, the tighten it another 1-1/4 turns using a wrench.
6. Install the plug into the end of the double support weld-o-let. Tighten the plug to prevent leakage. Make sure that there is
no leakage in the system.
7. Follow steps 8 through 13 in "Installation Instructions, Single Support" on page 5.
TYPICAL INSTALLATION WITH DIFFERENTIAL PRESSURE TRANSMITTER
Vertical Pipes
PIPE
FILL HERE W/WATER
1/2" TUBING
3- or 5-VALVE
MANIFOLD
DP. TRANSMITTER
ELLIPSE
SENSOR
CROSS TEES
Horizontal Pipes
Figure 6: Typical installation
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User Manual
LOCATION INSTRUCTIONS
Straight pipe requirements: Accuracy is affected by the piping configurations due to the disturbances of the flow profile. A
fully developed symmetrical flow profile is achieved with the minimum upstream and downstream recommended lengths.
TYPICAL INSTALLATION ORIENTATION
DISTANCES ARE EXPRESSED IN
NUMBER OF NOMINAL PIPE DIAMETERS
THROTTLED VALVE OR REGULATOR TWO ELBOWS IN DIFFERENT PLANE S
CHANGE IN PIPE SIZE TWO ELBOWS IN THE SAME PLANE
A SINGLE ELBOW
Figure 7: Location instructions
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FLOW CURVE
ANNULAR ELLIPS
1
.9
.6
.5
.4
.3
12" 16" 20"
2 3 4 5 6 7 8 9 1
0
0
0
0
WATER 60° F
2 3 4 5 6 7 8 9 1
0
0
0
0
0
E
2" 2.5" 3.5"3" 4" 5" 6" 8" 10" 14" 18" 24" 30"
100
90
80
70
60
50
40
30
20
O
2
10
9
8
7
6
5
4
3
2
Figure 8: Flow curve
2 3 4 5 6 7 8 9 1
0
0
0
USGPM
2 3 4 5 6 7 8 9 1
0
0
0
∆P – INCHES OF H
.8
.7
.2
2 3 4 5 6 7 8 9 1
NOTE:
2" THRU 10" CURVES ARE FOR SCH. 40 PIPE
12" AND ABOVE ARE FOR SCH. STD. PIPE
1
Control. Manage. Optimize.
PRESO is a registered trademark of Badger Meter, Inc. Other trademarks appearing in this document are the property of their respective entities. Due to continuous research,
product improvements and enhancements, Badger Meter reserves the right to change product or system specications without notice, except to the extent an outstanding
contractual obligation exists. © 2014 Badger Meter, Inc. All rights reserved.
www.badgermeter.com
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