Badger Meter AHL-GD - Hot Tap, High Pressure User Manual

Ellipse® Pitot Tube Meter

SCH/WALL

MOD/β

DIA/ID

CAP

DP

TAG

FLOW METERS

W/O

AHL-GD Dierential Pressure Flow Meter

PTT-UM-00327-EN-02 (April 2014)

User Manual

Ellipse® Pitot Tube Meter, AHL-GD Dierential Pressure Flow Meter

CONTENTS

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Pipe Orientation and Sensor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Installation Instructions, Single Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Installation Instructions, Double Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

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. Model AHL-GD
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: AHL-GD specifications

User Manual

True Static
Sensing Holes

Figure 1: AHL-GD Ellipse pressure sensing holes

Page 3 April 2014

Ellipse® Pitot Tube Meter, AHL-GD Dierential Pressure Flow Meter

with Proper Bleeding

Lock Nuts

FLOW

PIPE ORIENTATION AND SENSOR MOUNTING

H L

FLOW METERS
W/O

MOD/β
DIA/ID

SCH/WALL

CAP
DP
TAG

Field Weld

FLOW

FLOW

FLOW METERS
W/O

MOD/β
DIA/ID

SCH/WALL

CAP
DP
TAG

10° 10°

Air, Gas, or Liquid

FLOW

FLOW METERS
W/O

MOD/β
DIA/ID

SCH/WALL

CAP
DP
TAG

H L

Figure 2: Horizontal pipe installation

Field Weld

Liquid

MOD/β
DIA/ID
CAP
DP
TAG

FLOW METERS
W/O

SCH/WALL

5° Max

10° 10°

.

or

Field
Weld

Liquid, Air and Gas

Note: Illustration represents installation for downward ow.

Figure 3: Vertical pipe installation and sensor alignment

5° Max.

F
L

W

O

FLOW METERS

W/O

SCH/WALL

MOD/β

DIA/ID

CAPDPTAG

Sensor Alignment

Note: Probe alignment applies to all
horizontaland vertical installations.

Page 4 April 2014

User Manual

Field Weld

INSTALLATION INSTRUCTIONS, SINGLE SUPPORT

1. Choose the proper location to install the AHL-GD Dierential Pressure Flow Meter using AGA/ASME standards (or
equivalent). Refer to the location diagrams Figure 2, Figure 5 and Figure 6.

2. Grind the surface of the pipe where the AHL-GD Dierential Pressure Flow 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. Install the close nipple by threading it into the weld connector. Next, 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-GD (7⁄8 in.) 1-1/4 in. 1-1�8 in.

AHL-GD (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. Having drilled through the pipe, withdraw the drill bit through the isolating ball valve. Once the drill bit has been
withdrawn, close the ball valve and dismantle the drilling machine. Ensure that 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.

8. Install the instrument valves (optional) at the pressure connections located on the AHL-GD Dierential Pressure Flow Meter
sensor head. Ensure that the valves are fully closed before proceeding.

FLOW

H L

FLOW METERS
W/O

MOD/β
DIA/ID

SCH/WALL

CAP
DP
TAG

H L

FLOW METERS
W/O

SCH/WALL

FLOW

Figure 4: Flow indication arrow

9. Open the isolating ball valve. Insert the AHL-GD Dierential Pressure Flow Meter 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.

Page 5 April 2014

Ellipse® Pitot Tube Meter, AHL-GD Dierential Pressure Flow Meter

INSTALLATION INSTRUCTIONS, DOUBLE SUPPORT

1. Follow steps 1 through 6 in the single support section. 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-GD (7⁄8 in.) 1/8 in. 3/8 in.

AHL-GD(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-GD Dierential Pressure Flow Meter 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 installation

4. Align the arrow located on the sensor head in the direction of ow as shown in Figure 4.

5. Ensure that the AHL-GD Dierential Pressure Flow 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.

Page 6 April 2014

User Manual

MOD/
DIA/ID
CAP
DP
TAG

MOD/
DIA/ID
CAP
DP
TAG

MOD/β
DIA/ID
CAP
DP
TAG

MOD/
DIA/ID
CAP
DP
TAG

MOD/β
DIA/ID
CAP
DP
TAG

MOD/β
DIA/ID
CAP
DP
TAG

MOD/
DIA/ID
CAP
DP
TAG

MOD/
DIA/ID
CAP
DP
TAG

MOD/
DIA/ID
CAP
DP
TAG

MOD/β
DIA/ID
CAP
DP
TAG

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.

DISTANCES ARE EXPRESSED IN

NUMBER OF NOMINAL PIPE DIAMETERS

THROTTLED VALVE OR REGULATOR

27

FLOW

Regulator or Partially

Closed Valve

11

6 5

2

FLOW

H L

FLOW METERS
W/O

β

SCH/WALL

H L

FLOW METERS
W/O

β

SCH/WALL

4

4

Preso

Preso

TWO ELBOWS IN DIFFERENT PLANES

H L

FLOW METERS
W/O

SCH/WALL

FLOW

10

FLOW

5

H L

FLOW METERS
W/O

SCH/WALL

5

2

424

Preso

4

Preso

CHANGE IN PIPE SIZE TWO ELBOWS IN THE SAME PLANE

49

H L

FLOW METERS
W/O

SCH/WALL

FLOW

4

10

64

H L

FLOW METERS
W/O

β

SCH/WALL

2

FLOW

Straightening Vane

Straightening Vane

Preso

Preso

49

H L

FLOW METERS
W/O

MOD/β
DIA/ID

SCH/WALL

CAP
DP
TAG

FLOW

4

10

64

H L

FLOW METERS
W/O

MOD/β
DIA/ID

SCH/WALL

CAP
DP
TAG

2

FLOW

Straightening Vane

3

Preso

Preso

A SINGLE ELBOW

5

2

H L

FLOW METERS
W/O

SCH/WALL

2

H L

FLOW METERS
W/O

β

SCH/WALL

FLOW

37

Preso

3

Preso

4

2

Straightening Vane

11

9

FLOW

FLOW

β

5

β

Straightening Vane

H L

FLOW METERS
W/O

SCH/WALL

H L

FLOW METERS
W/O

SCH/WALL

3

Preso

3

Preso

FLOW

Straightening Vane

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 specications 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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