Ellipse® Pitot Tube Meter
AS Annular Threaded Steam Meter
PTT-UM-00515-EN-02 (April 2014)
User Manual
Ellipse® Pitot Tube Meter, AS Annular Threaded Steam Meter
CONTENTS
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pipe Orientation and Sensor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Instructions, Single Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation Instructions, Double Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical Installation with Dierential Pressure Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Location Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Flow Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Page ii April 2014
INTRODUCTION
The Preso patented 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 AS comes
with instrument shutoff valves with provisions to accept a transmitter or
direct indicating meter.
User Manual
True static
sensing holes
Impact velocity
sensing holes
Figure 1: AS pressure sensing holes
SPECIFICATIONS
Applications Steam
Pipe Sizes
Pressure
Temperature
Accuracy
Turndown Ratio
Standard Components
Reynolds Number
Resonance
2…48 inches (50…1220 mm)
600 psi (4100 kPa) maximum
480° F (250° C) maximum
±0.75% of reading
17:1 with no vacuum effect
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
Greater than 75,000 maintains most accurate flow measurements
Less than 75,000 consult factory for estimated results
If greater than 0.8, use double support.
Table 1: Specifications
Page 3 April 2014
W
Ellipse® Pitot Tube Meter, AS Annular Threaded Steam Meter
PIPE ORIENTATION AND SENSOR MOUNTING
FLOW
Field Weld
Preferred installation
Figure 2: Horizontal pipe installation
F
L
OR
O
OTE:N For general steam applications, instrument valves should be mounted at the same elevation to maintain equal
condensation levels.
F
L
O
W
Field Weld
OTE:N Preferred flow direction for steam is upward.
Illustration represents installation for upward flow.
Figure 3: Vertical pipe installation
Allowable plane of installation
O
F
L
OR
W
O
F
L
W
Page 4 April 2014
User Manual
INSTALLATION INSTRUCTIONS, SINGLE SUPPORT
1. Choose the proper location to install the AS Ellipse using AGA/ASME standards (or equivalent). See "Location Instructions"
on page 7.
2. Grind the surface of the pipe where the AS Ellipse is to be inserted to provide a clean area for welding.
3. Weld the supplied weld-o-let to the pipe using standard codes for your application (1/16" weld gap recommended). Take
care to protect the threads during the welding process.
4. Drill a hole through the pipe wall according to Table 2.
5. Deburr the hole just drilled, especially on the inside of the pipe.
Model / Sensor Weld Connector Drill Bit
AS (7/8") 1" 1-1/8"
AS1 (1-1/4") 1-1/4" 1-3/8"
Table 2: Single support drill bit size
6. Assemble the supplied compression tting as diagrammed in Figure 3. Thread the assembled compression tting into
the weld-o-let manually. With a wrench, tighten the body of the tting another 1-1/4 turns, taking care not to tighten the
compression nut.
7. Install the instrument valves (optional) at the AS Ellipse head connections. Make sure the valves are FULLY CLOSED to
prevent them from leaking during startup. Install the two forged crosses to the valves.
8. Insert the AS Ellipse through the compression tting. Carefully push the sensor by hand further into the pipe until it
reaches the opposite wall.
9. While holding the AS Ellipse in its fully inserted position, align the arrow on the sensor head with the direction of ow. See
Figure 4.
Compression
Fitting Nut
Insert
Body
Figure 4: Compression fitting Figure 5: Sensor alignment
Tighten Nut, as
Shown, onto Body
of the Compression
Fitting
Install Insert
as Shown
Install Threaded
Portion into Weld
Fitting on Pipe
FLOW
Field Weld
10. To prevent leakage, manually tighten the compression nut, the use a wrench to tighten it another 1-1/4 turns.
11. Connect the 1/2" tubing to the connections on the forged cross components. Connect these lines to a three-valve
manifold transmitter.
12. 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.
13. Slowly pour water into the top ports of each forged cross tee until the system is full. Water will flow out of the side ports of
both crosses.
14. Reinstall the 1/2" plugs into the top and side ports. Ensure that they are secure. Then fully open the two gate valves.
15. Allow condensation levels to stabilize for 30 minutes before taking instrument reading.
Page 5 April 2014
Ellipse® Pitot Tube Meter, AS Annular Threaded Steam Meter
INSTALLATION INSTRUCTIONS, DOUBLE SUPPORT
1. Follow steps 1 through 7 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.
2. Weld the double support weld-o-let, making sure that it is centered with the drilled hole (1/16" weld gap recommended).
Model / Sensor Weld Connector Drill Bit
AS (7/8") 1/2" 1/2"
AS1 (1-1/4") 1" 7/8"
Table 3: Double support drill bit size
3. Install the AS 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 6: Double support pin
4. While holding the AS Ellipse in its fully inserted position, align the sensor head with the direction of ow as in step 9,
“Installation Instructions, Single Support” on page 5.
5. Check that the AS Ellipse is in the correct orientation and spans the inside of the pipe. Tighten the compression nut
manually, then use a wrench to tighten it another 1-1/4 turns.
6. Install the plug into the end of the double support weld-o-let. Tighten the plug to prevent leakage. Ensure that there is no
leakage in the system.
7. Follow steps 11 through 15 in “Installation Instructions, Single Support” on page 5.
TYPICAL INSTALLATION WITH DIFFERENTIAL PRESSURE TRANSMITTER
Vertical Pipes
Pipe
Fill here
with water
1/2" Tubing
3- or 5-Valve
Manifold
DP Transmitter
Ellipse
Sensor
Cross Tees
Horizontal Pipes
Figure 7: Installation with differential pressure transmitter
Page 6 April 2014
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 PLANES
CHANGE IN PIPE SIZE TWO ELBOWS IN THE SAME PLANE
DIRECT MOUNT TO A SINGLE ELBOW* A SINGLE ELBOW
Figure 8: Location instructions
Page 7 April 2014
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 9: 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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