Badger Meter Hedland T303 Manual de usuario

User Manual

Variable Area Flow Meters

Inline Pneumatic Flow Meter

VAM-UM-00593-EN-02 (August 2014)

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CONTENTS

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

Operating Principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Compressibility of Gases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Installation Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Installing the Flow Meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Installing the Test Kit Flow Meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Multi-Pressure Flow Scales. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Single Pressure Flow Scales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Removal of Dust Guard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Quick Recoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Test Kit Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Fluid Selection Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Flow vs. Pressure Drop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Air/Compressed Gases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Air/Compressed Test Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Air/Caustic and Corrosive Gases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Materials of Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Standard Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Test Kits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Variable Area Flow Meters, Inline Pneumatic Flow Meter

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INTRODUCTION

The Inline Pneumatic Flow Meter is a rugged industrial class flow rate indicator and is offered in aluminum, brass, T303 and

T316 stainless steel models to monitor pressurized air lines and a wide range of other compressed gases. Available in seven

port sizes from 0.25…3 inch for flow ranges from 0.5…5 scfm (0.2…2.2 l/sec) through 200…2200 scfm (75…1130 l/sec),

meters are calibrated at 1.0 specific gravity. In addition to the basic model, the aluminum, brass and T303 stainless steel

models are offered in three configurations: an extended inlet cap fitted with a pressure gauge, an extended inlet cap with a

0.25 inch NPTF plugged gauge port, and a test kit with an extended inlet cap fitted with a 160 psi pressure gauge and control

valve on the outlet.

The Flow Meter is equipped with a 360° rotatable guard/scale which allows the meter to be installed in any orientation

without regard to scale direction. Once the meter is permanently installed, the guard/scale can be rotated 360° to

optimize readability.

The unique spring loaded design of this variable area flow meter allows it to be installed in any position, including inverted,

without affecting accuracy. An optional inverted scale is available for these applications.

Aluminum models are offered as a rugged, low cost flow meter for monitoring noncorrosive pneumatic systems under

operating pressures up to 1000 psi (69 bar), 250 psi (17 bar) for 3" models, and 600 psi (41 bar) for test kits.

Brass meters are recommended for applications with operating pressures up to 1000 psi (69 bar) without corrosion inhibitors.

Stainless Steel is available for monitoring systems operating at pressures up to 1500 psi (103 bar). The T316 stainless steel

models are recommended for monitoring caustic or corrosive gases, such as hydrogen chloride or sulfur dioxide. The T303

stainless steel test kit is rated to 600 psi (41 bar); pressure rating is limited by the valve. For further construction material

information, see "Materials of Construction" on page 15 .

Introduction

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OPERATING PRINCIPLE

The Flow Meter is a variable area instrument. A sharp-edged orifice, located within the piston assembly, forms an

annular opening with the contoured metering cone. The piston assembly carries a cylindrical PPS/ceramic magnetthat

is magnetically coupled to an external indicating magnet, which moves precisely in direct response to movement of the

piston. A calibrated springopposes flow in the forward direction.

The Hedland variable area flow meters are the most readable products in their class. Brightly colored indicators move over the

graduated, linear flow scalewhich contains bold, easy-to-read numeral and gauge marks. The enhanced resolution virtually

eliminates parallax problems associated with competitive direct reading flow meters.

Figure 1: Inline pneumatic flow meter

Operating Principle

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INSTALLATION

THIS PRODUCT SHOULD BE INSTALLED AND SERVICED BY A TECHNICALLY QUALIFIED PERSONNEL TRAINED IN

MAINTAINING INDUSTRIAL CLASS FLOW INSTRUMENTATION AND PROCESSING EQUIPMENT.

READ INSTRUCTIONS THOROUGHLY BEFORE INSTALLING THE UNIT. IF YOU HAVE ANY QUESTIONS REGARDING

PRODUCT INSTALLATION OR MAINTENANCE, CALL YOUR LOCAL SUPPLIER FOR MORE INFORMATION.

THIS METER MAY CONTAIN RESIDUAL AMOUNTS OF TEST FLUID AT THE TIME OF SHIPMENT. THIS FLUID SHOULD BE

REMOVED PRIOR TO INSTALLATION AS THE FLUID MAY BE INCOMPATIBLE OR HAZARDOUS WITH SOME LIQUIDS OR

GASES. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN DAMAGE TO THE EQUIPMENT.

THIS STANDARD METER IS UNIDIRECTIONAL. ATTEMPTS TO FLOW FLUIDS IN THE OPPOSITE DIRECTION OF THE FLOW

ARROW WILL RESULT IN THE METER ACTING AS A CHECK VALVE, CREATING A DEADHEADING SITUATION. IF THE

DIFFERENTIAL PRESSURE MAGNITUDE IS GREAT ENOUGH, DAMAGE TO THE INTERNAL PARTS OF THE METER WILL

RESULT.

A LINE SNUBBER IS RECOMMENDED FOR APPLICATIONS IN WHICH RAPID VALVE ACTUATION OR PULSATION IS

ANTICIPATED. THIS NOT ONLY REDUCES THE RISK OF DECOUPLING THE FLOW METER'S MAGNETIC PISTON, IT ALSO

REDUCES EXCESSIVE WEAR ON OTHER COMPONENTS IN THE SYSTEM.

Compressibility of Gases

Gases are significantly compressible so the density of any compressed gas will vary according to changes in operating

pressure levels. In other words, volumetric flow rates will vary significantly with changes in line pressure. Therefore, pneumatic

flow meters should be installed with a pressure gauge located as close as possible to the inlet port. The psig range capacity

of this pressure gauge should be at least 125% of the anticipated pressure in the system, or be suitable for the maximum

expected line pressure (if higher). For example, if the anticipated operating pressure is 100 psig, a pressure gauge with a

capacity of at least 125 psig should be installed as close as possible to the inlet port.

Installation

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Installation Recommendations

The inline flow meter is a simple device to install. However, the following measures are recommended for reliable, trouble-

free operation:

1. Piping should be accurately aligned and of correct length. The high pressure body of the ow meter can withstand

shock and ow/pressure pulsation. However, the piping should be rmly supported by external mounting brackets, both

upstream and downstream of the meter, to avoid any pipe exing actions that could reduce meter life.

2. If the ow meter inlet or outlet are to be rigidly mounted, and the opposing port is to be connected to a exible hose, the

end connected with the exible hose must be rigidly mounted.

3. Use Teon® tape for sealing NPT tting.

4. Install a union near the inlet or outlet of the meter for quick, easy meter removal and inspection during periodic

maintenance procedures.

5. Mount the meter either horizontally or vertically (ow arrow pointing to either side or straight up). If the meter must be

mounted inverted, special inverted scales are available.

6. Ensure the uid is traveling in the direction of the ow arrow (see Figure 2).

7. Systems that do not have ltration should be equipped with at least a 200 mesh (74 micron) lter. Most systems already

have much ner ltration. The meter will allow particulate to pass that would jam most valves and ow controls. Dirt,

ferrous metal or sealing agents, such as Teflon® tape may lodge and cause malfunction. If the meter is jammed at a fixed

position, see "Removal of Dust Guard" on page 11.

8. Don not use thread locking compounds as thread sealant.

9. Do not install the ow meter near turbulence producing ttings such as elbows, reducers and close coupled valves for

maximum reliability. The inline ow meter does not require ow straighteners or special lengths of straight inlet/outlet

piping to stabilize turbulent ow patterns.

10. Do not install the meter near fast-acting valves. Fast-acting valves have the potential to create high magnitude hydraulic

pressure spikes. These spikes can damage the internal components of the meter, resulting in inaccuracies or malfunction.

11. Do not allow unidirectional meters to be operated against the direction of the ow arrow. The standard ow meter is an

unidirectional ow meter. The piston acts as a check valve to block ow in the reverse direction. This causes an excessive

pressure dierential, which can result in damage to internal meter components.

Installing the Flow Meter

1. Mount the meter so uid is traveling in the direction of the ow arrow. See Figure 1 on page 4.

Flow Direction

Arrow

AIR

Figure 2: Flow direction arrow

2. Select a mounting location that is suitable for viewing and product service. To connect the ow meter into the piping

system, place an open-ended wrench onto the ow meter wrench ats adjacent to the pipe connection being installed.

DO NOT wrench on the opposite end of the ow meter or leakage may result. See Figure 3 on page 7.

Installation

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Place wrench on meter ats on the same side

plumbing is being tightened

Never place wrench on meter ats opposite

plumbing being tightened

Figure 3: Installing meter

3. After installation, rotate the meter by hand to the view ow scale. See Figure 4.

Rotate meter by hand to view ow scale

Never use wrench to rotate meter

body when viewing ow scale

Figure 4: Rotating meter

Installation

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Installing the Test Kit Flow Meter

1. Mount the VA High Pressure Test Kit Flow Meter so uid is traveling in the direction of the ow arrow. See

Figure 2 on page 6.

2. Install the test kit at any location in the pneumatic circuit that is suitable for viewing. To connect the test kit into the piping

system, place an open-ended wrench onto the test kit extended cap on the inlet side or on the test kit wrench at on the

outlet side adjacent to the pipe connection being installed. Do not wrench on the opposite end of the test kit or leakage

may result. See Figure 5.

Place wrench on valve body

on the same side plumbing is being tightened

Never place wrench on valve body

opposite plumbing being tightened

Figure 5: Installing test kit

Or, use quick disconnect couplings for easy connections and to keep the test kit sealed and clean when not in use.

3. After installation, rotate the meter by hand to the view ow scale. See Figure 6.

Rotate meter by hand to view ow scale

Never use wrench to rotate meter

body when viewing ow scale

Figure 6: Rotating test kit

Installation

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OPERATION

Multi-Pressure Flow Scales

The inline pneumatic flow meter is offered with a multi-pressure flow scale to visually indicate air flow rates in standard cubic

feet per minute (scfm) at 1.0 s.g. (70° F at 100 psi) or liters per second (l/sec) at 1.0 s.g. (21° C at 6.9 bar). The multi-pressure

scale design allows for use at line pressures from 40…130 psi in 10 psi increments (3.0…9.0 bar in 1 bar increments). This

configuration requires that a pressure gauge be installed at the meter inlet.

Read the inlet gauge pressure then select the appropriate vertical line or interpolated value closest to the gauge reading

and follow the line until it intersects the brightly colored horizontal indicator bar. The flow rate is read by taking the

intersection points, following the slope of the closest diagonal line to a scale value and interpolating the scfm (l/sec) flow

rate. No further calculations are required. See Figure 7.

120

130

110

100

SCFM @ 70°F

INLET PRESSURE (PSIG)

HORIZONTAL

INDICATOR BAR

AIR

Figure 7: Multi-pressure flow scale

Single Pressure Flow Scales

An optional single pressure flow scale is available in U.S. or metric units. This graduated scale is calibrated for air in standard

cubic feet per minute (scfm) at 1.0 s.g. (70° F at 100 psi), or liters per second (l/sec) at 1.0 s.g. (21° C at 6.9 bar). See Figure 7.

A standard cubic foot of air is defined as a cubic foot of air at 70 °F at atmospheric pressure 14.7 psia at sea level. Since it is

impossible to flow air at“standard”conditions, the scale is calibrated for an inlet condition of 100 psi (6.9 bar) at 70° F (21° C).

A correction factor must be calculated to determine the actual air volume. Each meter is supplied with the Conversion Chart,

see “Conversion Chart” on page 10.

AIR

SCFM

100 PSIG @ 70 ºF

Figure 8: Single pressure flow scale

Operation

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Application Information

Compressibility of Gases

Gases are significantly compressible so their density varies with pressure and temperature. Use Table 1 to convert indicated

scfm flow rates to actual scfm flow rates for your application.

Effects of Specific Gravity

Standard scales are calibrated for air with a specific gravity of 1.0. Use Table 3 of the conversion chart ito calculate“actual”scfm

flow rates of gases with a specific gravity other than 1.0.

Conversion Chart

The conversion chart provides a series of simplified mathematical formulas to adjust the graduated scale for changes in

pressure (see Table 1), temperature (see Table 2), or specific gravity (see Table 3). Special scales can be made to accommodate

other pressures, temperatures and specific gravity.

The conversion chart can also be used to adjust the multi-pressure flow scale to indicate flow rates in applications beyond the

parameters stated on the scale.

To adjust for pressures beyond (above or below) scale limits:

1. Locate point at which the brightly colored indicator line intersects the vertical 100 psig pressure line.

2. Divide this reading by the pressure correction factor (f₁) indicated in the conversion chart.

To adjust for changes in temperature:

1. Divide the 100 psig ow rate reading by temperature correction factor (f₂).

To adjust for changes in specific gravity:

1. Establish the square root of the new specic gravity.

2. Divide the 100 psig ow rate reading by the specic gravity correction factor (f₃).

psig 25 50 75 100 125 150 175 200 225 250

bar 1.7 3.5 5.2 6.9 8.6 10.4 12.1 13.8 15.5 17.2

kPa 172 345 517 689 862 1034 1207 1379 1551 1724

f11.700 1.331 1.131 1.000 0.902 0.835 0.778 0.731 0.692 0.658

fpsig

1114 7

14 7

.fBAR

17 914

1 014

.fkPa

1790 857

101 357

Table 1: Pressure correction factor

°F +10 +30 +50 +70 +90 +110 +130 +150 +170 +190

°C –12.2 –1.1 +909 +21.0 +32.1 +43 +54 +65 +76 +88

f20.942 0.962 0.981 1.000 1.018 1.037 1.055 1.072 1.090 1.107

2460

530

=+° fC

2273

293

=+°

Table 2: Temperature correction factor

fSpGr3=

Table 3: Specific gravity correction factor

Operation

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