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1. Diaphragm Meters. Principles of Operation. 1. Diaphragm Meters. 1. Diaphragm Meters. Residential Meters AC-175 AM-250 AT-210/250 AC-250 AT-350 AL-425. 1. Diaphragm Meters. 1. Diaphragm Meters. B109.2 (Over 500 CFH) Flow Rates for each Class (CFH) Class Minimum Maximum

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1. Diaphragm Meters


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1 diaphragm meters
1. Diaphragm Meters
  • Principles of Operation
1 diaphragm meters3
1. Diaphragm Meters
  • Residential Meters
    • AC-175
    • AM-250
    • AT-210/250
    • AC-250
    • AT-350
    • AL-425
1 diaphragm meters5
1. Diaphragm Meters
  • B109.2 (Over 500 CFH)
  • Flow Rates for each Class (CFH)
    • Class Minimum Maximum
      • 500 500 899
      • 900 900 1399
      • 1400 1400 2299
      • 2300 2300 3499
      • 3500 3500 5599
1 diaphragm meters6
1. Diaphragm Meters
  • Commercial
    • AC-630
    • AL-800
    • AL-1000
1 diaphragm meters7
1. Diaphragm Meters
  • Industrial
    • AL-1400
    • AL-2300
    • AL-5000
slide9

1.Diaphragm Meters

  • Capacity at Elevated Pressure
    • Diaphragm meter capacities at elevated pressures must be de-rated to limit differential pressure to a maximum of 8” w.c.
    • This practice of limiting differential pressure extends service life of valves and diaphragms.
1 diaphragm meters10
1. Diaphragm Meters
  • Capacity of diaphragm meter at elevated pressure

Qr = Qi x {( Pg + Pa ) / Pb } 3/4

1 diaphragm meters11
1. Diaphragm Meters
  • Qr = Qi x {( Pg + Pa ) / Pb } 3/4
  • Where:
    • Qr = Rated Capacity at elevated pressures
    • Qi = Rated Capacity at 0.25 psig
    • Pg = Gage Pressure
    • Pa = Atmospheric Pressure
    • Pb = Base Pressure
slide12

1. Diaphragm Meters

Capacity at Elevated Pressure

Example: What is the capacity of an AL-1400 diaphragm meter rated at 3000 SCFH at a 2” w.c. differential pressure when it is operating at 15 PSIG, an atmospheric pressure of 14.4 PSIA, and a base pressure of 14.73?

slide13

1. Diaphragm Meters

Capacity at Elevated Pressure

Qr = Qi x {(PG+Pa)/Pb}3/4

Qr = 3000x {(15+14.4)/14.73}3/4

=5000 SCFH

slide15

1. Diaphragm Meters

  • Size of diaphragm meter operating at elevated pressure needed for a load.
  • Qi = Qr / {(PG+Pa)/Pb}3/4
    • Where:
    • Qi = Rated Capacity at 0.25 psig
    • Qr = Load in SCFH
    • PG = Gage Pressure
    • Pa = Atmospheric Pressure
    • Pb = Base Pressure
slide16

1. Diaphragm Meters

  • Meter Sizing Based on Load
  • Example:
    • Connected load = 3,500 scfh
    • Meter pressure = 15 psig
    • Atmospheric pressure = 14.4 psia
    • Base pressure = 14.73 psia
    • What size meter should be used?
slide17

1. Diaphragm Meter

  • Meter Sizing Based on Load
  • Solution
    • Qi = Qr / {(PG+Pa)/Pb}3/4 = 3500/{(15+14.4)/14.73} 3/4 = 3500/ {1.9959} 3/4 = 3500/1.679 = 2084 CFH
    • Use an AL-2300
1 diaphragm meter20
1. Diaphragm Meter
  • Options
    • Pressure Compensating Index
1 diaphragm meter21
1. Diaphragm Meter
  • Options
    • Temperature Compensation
1 diaphragm meter22
1. Diaphragm Meter
  • Options
    • AMR (Automatic Meter Reading) Compatible
1 diaphragm meters24
Installation

Ship, store, and install in upright position

Keep dirt and water out

Level + 1/4”

No undue stress

Do not bury

Filter may be needed

Protect from damage

Hand tighten swivels first

Check for leaks

Slowly pressurize

Need for by-pass?

Cathodic Protection considerations

1. Diaphragm Meters
1 diaphragm meters25
1. Diaphragm Meters
  • Factors that affect Accuracy
    • Internal friction that increases differential
    • Maintaining constant diaphragm displacement over a range of operating conditions
    • External leaks
    • Internal leaks
    • Wear