Ellipse® Pitot Tube Meter
AHL Annular High Pressure Hot Tap Meter
FLOW METERS
W/O
SCH/WALL
MOD/β
DIA/ID
CAP
DP
TAG
PTT-UM-00326-EN-02 (April 2014)
User Manual
Ellipse® Pitot Tube Meter, AHL Annular High Pressure Hot Tap Meter
CONTENTS
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pipe Orientation and Sensor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Instructions, Single Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Instructions, Double Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Location Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Flow Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Page ii April 2014
INTRODUCTION
Impact Velocity
Sensing Holes
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.
AHL Annular High Pressure Hot Tap Meter comes with instrument shutoff
valves with provisions to accept a transmitter or direct indicating meter.
SPECIFICATIONS
Applications Air, liquids and gases
Pipe Sizes 2…72 in. (50…1829 mm)
Pressure 800 psi (5515 kPa) maximum
Temperature 800° F (426° C) maximum
Accuracy ±0.75% of reading
Turndown Ratio 17:1 with no vacuum effect
T-type head, 316 SS 1/4 in. or 1/2 in. FNPT connection
CS 3000 lb thread fitting, ASTM A105
316/316L SS Ellipse sensor
Instrument valves (2 per sensor), 1/4 in. or 1/2 in., CS
316 SS ID tag with wire
Standard Components
Reynolds Number
Resonance
150 lb 316/316L SS sensor flange
CS packing chamber with molythane or graphite packing gland
CS packing chamber flange, 150 lb with SS cap
316 SS isolation ball valve, NPT threaded
CS threaded nuts and bolts
CS nipples, schedule 40
Greater than 75,000 maintains most accurate flow measurements
Less than 75,000 consult factory for estimated results
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
True Static
Sensing Holes
Figure 1: AHL pressure sensing holes
User Manual
Page 3 April 2014
Ellipse® Pitot Tube Meter, AHL Annular High Pressure Hot Tap Meter
Bleeding
MOD/
DIA/ID
CAP
DP
TAG
PIPE ORIENTATION AND SENSOR MOUNTING
FLOW
H L
FLOW METERS
W/O
β
SCH/WALL
Field Weld
FLOW METERS
W/O
MOD/β
DIA/ID
SCH/WALL
CAP
DP
TAG
Field Weld
10° 10°
10° 10°
FLOW METERS
W/O
MOD/β
DIA/ID
SCH/WALL
CAP
DP
TAG
H L
FLOW METERS
W/O
MOD/β
DIA/ID
SCH/WALL
CAP
DP
TAG
FLOW
Gas or Liquid
with Proper
Figure 2: Horizontal pipe installation
Liquid
INSTALLATION INSTRUCTIONS, SINGLE SUPPORT
1. Choose the proper location to install the AHL Annular High Pressure Hot Tap Meter using AGA/ASME standards (or
equivalent). See Figure 2, Figure 5 and Figure 6.
2. Grind the surface of the pipe where the AHL Annular High Pressure Hot Tap Meter is to be inserted to provide a clean area
for welding.
3. Weld the supplied thread-o-let to the pipe using standard codes for your application (1/16 in. 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 3-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.
Model/Sensor Weld Connector Drill Bit
AHL (7/8 in.) 1-1/4 in. 1-1/8 in.
AHL (1-1/4 in.) 1-1/2 in. 1-3/8 in.
Table 2: Single support drill bit size
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.
6. Withdraw the drill bit through the isolating ball valve, close the ball valve and dismantle the drilling machine. Make sure
there is no leakage at the valve and close nipple connections. The ball valve is to remain completely closed until step 9.
7. Install the cage nipple assembly and packing gland with the threaded rods assembly by threading it into the isolating ball
valve. Align the arrow on the sensor head with the direction of ow. See Figure 4 and Figure 5.
Page 4 April 2014
User Manual
MOD/
DIA/ID
CAP
DP
TAG
8. Install the instrument valves (optional) at the pressure connections on the AHL Annular High Pressure Hot Tap Meter
sensor head. Make sure the valves are fully closed before proceeding.
9. Open the isolating ball valve. Insert the AHL Annular High Pressure Hot Tap Meter sensor into the pipe. Use a wrench to
turn the threaded insertion rods clockwise until the sensor reaches the opposite pipe wall.
10. Connect the instrument lines to the sensor head valves, then to a gage or transmitter.
H L
β
SCH/WALL
Field Weld
FLOW
FLOW METERS
W/O
H L
FLOW METERS
W/O
SCH/WALL
FLOW
Figure 3: Sensor alignment
INSTALLATION INSTRUCTIONS, DOUBLE SUPPORT
1. Follow steps 1 through 6 in “Installation Instructions, Single Support” on page 4. 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 de-burr,
especially on the inside of the pipe. The hole used for the double support should be sized according to Table 3.
Model/Sensor Weld Connector Drill Bit
AHL (7/8 in.) 1/8 in. 3/8 in.
AHL (1-1/4 in.) 1 in. 7/8 in.
Table 3: Double support drill bit size
2. Weld the double support thread-o-let, making sure that it is centered with the drilled hole (1/16 in. weld
gap recommended).
3. Install the AHL Annular High Pressure Hot Tap Meter sensor through the two holes. Make sure that the double support pin
passes through the guide ring. See Figure 4.
Page 5 April 2014
Ellipse® Pitot Tube Meter, AHL Annular High Pressure Hot Tap Meter
FLOW
Ellipse Sensor
Double Support Pin
Guide Ring
Figure 4: Double support installation
4. Align the arrow on the sensor head in the direction of ow as shown in Figure 3.
5. Make sure the AHL Annular High Pressure Hot Tap Meter is in the correct orientation and spans the inside of the pipe.
Tighten the threaded insertion rods until the sensor reaches the other end of the pipe.
6. Install the plug into the end of the double support thread-o-let. Tighten the plug to prevent leakage.
FLOW
.
5° Max
or
Field
Weld
Liquid, Air and Gas
Note: Illustration represents installation for downward ow.
Figure 5: Vertical pipe installation and sensor alignment
H
O
F
L
W
FLOW
FLOW METERS
W/O
SCH/WALL
L
MOD/β
DIA/ID
CAPDPTAG
Sensor Alignment
Note: Probe alignment applies to all
horizontaland vertical installations.
5° Max.
Page 6 April 2014
User Manual
LOCATION INSTRUCTIONS
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.
Figure 6: Location instructions
Page 7 April 2014
FLOW CURVE
INCHES OF H
ANNULAR ELLIPS
10 in. CURVES ARE FOR SCHEDULE 40 PIPE
12 in. AND ABOVE ARE FOR SCHEDULE STANDARD PIPE
100000
12" 16" 20"
2" 2.5" 3.5"3" 4" 5" 6" 8" 10" 14" 18" 24" 30"
WATER 60 °F
2 3 4 5 6 7 8 9
10000
2 3 4 5 6 7 8 9
1000
2 3 4 5 6 7 8 9
USGPM
100
90
100
80
70
60
50
®
E
40
30
20
9
10
8
O
7
2
6
5
4
3
2
Figure 7: Pressure drops
1
.9
.8
.7
∆P –
.6
.5
.4
.3
.2
2 3 4 5 6 7 8 9
10
2 3 4 5 6 7 8 9
NOTE:
2…
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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