Ellipse® Pitot Tube Meter
AHS Annular Threaded Hot Tap Steam Meter
PTT-UM-00513-EN-02 (April 2014)
User Manual
Ellipse® Pitot Tube Meter, AHS Annular Threaded Hot Tap 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
User Manual
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 AHS comes
with instrument shutoff valves with provisions to accept a transmitter or direct
True static
sensing holes
Impact velocity
sensing holes
indicating meter.
Figure 1: AHS Ellipse pressure sensing holes
SPECIFICATIONS
Applications Saturated and super heated steam
Pipe Sizes AHS; 2…14 inches (50…356 mm)
AHS1; 14…24 inches (356…610 mm)
Pressure 800 psi (5515 kPa) maximum
Consult factory for higher pressures
Temperature 800° F (426° C) maximum
Consult factory for higher temperatures
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 3000 lb weld fitting, ASTM A105
316/316L SS Ellipse sensor
Instrument valves (2 per sensor), 1/2", CS
316 SS ID tag with wire
CS packing chamber with EPDM packing gland
CS isolation gate valve, NPT threaded
CS threaded nuts and bolts
CS nipples, schedule 40
Reynolds Number Greater than 75,000 maintains most accurate flow measurements
Less than 75,000 consult factory for estimated results
Resonance Less than 0.8 but greater than 1.2. If greater than 0.8, use double support. System shutdown
is required when the double support option is used. Select larger diameter Ellipse to avoid
double support.
Table 1: Specifications
Page 3 April 2014
W
Ellipse® Pitot Tube Meter, AHS Annular Threaded Hot Tap 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
5° Max.
5° Max.
Page 4 April 2014
User Manual
INSTALLATION INSTRUCTIONS, SINGLE SUPPORT
1. Choose the proper location to install the AHS Ellipse using AGA/ASME standards (or equivalent). See “Preso Ellipse Location
Instructions” on page 7.
2. Grind the surface of the pipe where the AHS 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. Thread the close nipple into the weld connector. Install the supplied three-piece isolating ball valve.
5. Mount the high pressure drilling machine onto the ball valve. Open the ball valve. Drill a hole through the pipe wall
according to Table 2 on page 5.
OTE:N There is no need for a drilling machine if it is not a hot tap installation or if the system is not pressurized.
Model / Sensor Weld Connector Drill Bit
AHS (7/8") 1-1/4" 1-1/8"
AHS1 (1-1/4") 1-1/2" 1-3/8"
Table 2: Single support drill bit size
6. Withdraw the drill bit through the isolating valve, close the valve and dismantle the drilling machine. Make sure there is no
leakage at the valve and close nipple connections. The valve is to remain completely closed until step 9.
7. Install the cage nipple, cage nipple assembly and packing gland with the threaded rods assembly by threading it into the
isolating valve. Align the arrow on the sensor head with the direction of ow. See Figure 4.
FLOW
Field Weld
Figure 4: Sensor alignment
8. Install the instrument valves at the AHS Ellipse head connections. Make sure the valves are fully closed to prevent them
from leaking upon startup. Install the cross tees.
9. Open the isolating ball valve. Insert the AHS Ellipse sensor into the pipe until it reaches the opposite pipe wall. This should
be done by turning the threaded insertion rods clockwise using a wrench.
10. Connect the instrument lines to the sensor head valves. In turn, connect these lines to a gage or transmitter.
11. Verify that the instrument valves are FULLY CLOSED. Remove the1/2" plugs from the top and side ports of the two (2)
forged cross tees.
12. 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.
13. Reinstall the 1/2" plugs into the top and side ports. Ensure that they are secure. Then fully open the two (2) gate valves.
14. Allow condensation levels to stabilize 1/2 hour before taking instrument reading.
Page 5 April 2014
Ellipse® Pitot Tube Meter, AHS Annular Threaded Hot Tap 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. The hole used for the double support should be sized according to
Table 3 on page 6.
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
AHS (7/8") 1-1/4" 1-1/8"
AHS1 (1-1/4") 1-1/2" 1-3/8"
Table 3: Double support drill bit size
3. Install the AHS 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 AHS 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. Ensure that the AHS Ellipse is in the correct orientation and spans the inside of the pipe. Tighten the compression nut.
After tightening the compression nut manually, tighten it 1-1/4 turns more using a wrench.
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 14 in “Installation Instructions, Single Support” on page 5.
TYPICAL INSTALLATION WITH DIFFERENTIAL PRESSURE TRANSMITTER
Horizontal Pipes
Ellipse
Sensor
Vertical Pipes
Pipe
Fill here
with water
1/2" Tubing
3- or 5-Valve
Manifold
DP Transmitter
Cross Tees
Figure 6: 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
A SINGLE ELBOW
Figure 7: Location instructions
Page 7 April 2014
FLOW CURVE
ANNULAR ELLIPS
1
.9
.6
.5
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
80
90
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
.4
.3
.2
.8
.7
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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