Ellipse® Pitot Tube Meter
BHL Annular Hot Tap Dual Rod Meter
PTT-UM-00516-EN-02 (April 2014)
User Manual
Ellipse® Pitot Tube Meter, BHL Annular Hot Tap Dual Rod Meter
CONTENTS
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pipe Orientation and Sensor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Instruction, Single Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation Instructions, Double Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 BHL comes
with instrument shutoff valves that can be plumbed to a transmitter or direct
indicating gauge.
User Manual
True static
sensing holes
Impact velocity
sensing holes
Figure 1: BHL pressure sensing holes
SPECIFICATIONS
Applications Liquids and gases
Pipe Sizes 2…24 inches (50…610 mm)
Pressure 400 psi (2760 kPa) maximum
Temperature 250° F (120° C) maximum
Accuracy ±0.75% of reading
Turndown Ratio 17:1 with no vacuum effect
Standard Components Y-type head, brass 1/8" FNPT connection
CS 3000 lb thread fitting, ASTM A105
316/316L SS Ellipse sensor
Instrument valves (2 per sensor), 1/4" SAE flare brass ball type
Polycarbonate ID tag with wire
CS packing chamber with molythane packing gland
CS threaded rods, nuts and bolts
Bronze isolation ball valve
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
Table 1: Specifications
Page 3 April 2014
W
Ellipse® Pitot Tube Meter, BHL Annular Hot Tap Dual Rod Meter
PIPE ORIENTATION AND SENSOR MOUNTING
L
H
FLOW
Field Weld
FLOW
F
L
O
Field Weld
Air, Gas or Liquid
with Proper Bleeding
F
OR
O
L
W
Field Weld
Figure 2: Horizontal pipe installation
H
L
H
Liquid
Or Sideways
as on
Vertical Pipes
L
5° Max.
5° Max.
F
L
W
O
OTE:N Preferred flow direction for air and gas is downward.
Preferred flow direction for liquid is upward.
Illustration represents installation for downward flow.
Figure 3: Vertical pipe installation
Page 4 April 2014
User Manual
INSTALLATION INSTRUCTION, SINGLE SUPPORT
1. Choose the proper location to install the BHL Ellipse using AGA/ASME standards (or equivalent). See “Location Instructions”
on page 7.
2. Grind the surface of the pipe where the BHL Ellipse 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" 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.
Pipe Size Model / Sensor Weld Connector Drill Bit
2"…5" BHL (1/2") 3/4" 5/8"
6"…12" BHL (7/8") 1-1/4" 1-1/8"
14"…24" BHL (1-1/4") 1-1/2" 1-3/8"
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.
H
L
H
L
Cage Nipple
Assembly
Weld
Connector
Field Weld
Isolating
Ball Valve
Close Nipple
FLOW
Figure 4: Sensor alignment
Page 5 April 2014
Ellipse® Pitot Tube Meter, BHL Annular Hot Tap Dual Rod Meter
8. Install the instrument valves (optional) at the pressure connections on the BHL Ellipse sensor head. Make sure the valves
are FULLY CLOSED before proceeding.
9. Open the isolating ball valve. Using a wrench, turn the threaded insertion rods clockwise into the pipe until the sensor
reaches the opposite pipe wall.
10. Connect the instrument lines to the sensor head valves. Connect these lines to a gage or transmitter.
INSTALLATION INSTRUCTIONS, DOUBLE SUPPORT
OTE:N For non-hot tap installations only.
1. Follow steps 1 through 6 in “Installation Instruction, 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.
Pipe Size Model / Sensor Weld Connector Drill Bit
2"…5" BHL (7/16") 1/8" 3/8"
6"…12" BHL (7/8") 1/2" 1/2"
14"…24" BHL (1-1/4") 1" 7/8"
Table 3: Double support drill bit size
2. Weld the double support thread-o-let making sure it is centered with the drilled hole (1/16" weld gap recommended).
3. Install the BHL 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. Align the arrow on the sensor head in the direction of ow as in step 7, “Installation Instruction, Single Support” on
page 5.
5. Check that the BHL Ellipse 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.
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 6: 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
2 3 4 5 6 7 8 9 1
0
0
0
USGPM
0
0
0
NOTE:
2" THRU 10" CURVES ARE FOR SCH. 40 PIPE
12" AND ABOVE ARE FOR SCH. STD. PIPE
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 3 4 5 6 7 8 9 1
2
∆P – INCHES OF H
.8
.7
.2
2 3 4 5 6 7 8 9 1
1
Figure 7: Flow curve
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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