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Fundamentals Fundamentals of of
Gas Measurement Gas Measurement
By By Harry Pytel Harry Pytel
Canadian Meter Company Inc. Canadian Meter Company Inc.
Introduction Introduction
n n Gas Measurement is the metering of gas Gas Measurement is the metering of gas supplies to residential,commercial and supplies to residential,commercial and industrial premises and is the process which industrial premises and is the process which determines how much gas has been used. determines how much gas has been used.
n n Ultimately it determines how much revenue Ultimately it determines how much revenue will be realized by the Gas Utility. will be realized by the Gas Utility.
TYPES OF METERS TYPES OF METERS
n n Diaphragm Diaphragm Positive Displacement Positive Displacement n n Rotary Rotary Positive Displacement Positive Displacement n n Turbine Turbine Inferential Inferential n n Orifice Plate Orifice Plate Inferential Inferential n n Ultrasonic Ultrasonic Inferential Inferential
Metering Metering Types of Meters Types of Meters
n n A. Positive Displacement A. Positive Displacement – – 1. Diaphragm 1. Diaphragm – – 2. Rotary 2. Rotary – – 3. Wet Test 3. Wet Test
Metering Metering Types of Meters Types of Meters
n n A. Positive A. Positive Displacement Displacement – – 1. Diaphragm 1. Diaphragm
Diaphragm Meters Diaphragm Meters
n n Components Components – – Body Body – – Diaphragms Diaphragms – – Linkage Linkage – – Valve Covers & Seats Valve Covers & Seats – – Index Index
Diaphragm Meters Diaphragm Meters
n n Principles of Operation Principles of Operation
Diaphragm Meter Series Diaphragm Meter Series
n n 175 175 n n 200 200 n n 400 400 n n 600 600 n n 750 750 n n 800 800 n n 1000 1000
Diaphragm Meters Diaphragm Meters
n n Industrial Industrial – – AL AL 1400 1400 – – AL AL 2300 2300 – – AL AL 5000 5000 – – R R 3000 3000 – – R R 5000 5000 – – R R 10,000 10,000
DIAPHRAGM METER DIAPHRAGM METER OPTIONS OPTIONS
n n Automatic Meter Automatic Meter Reading Reading
n n Pulse Output Pulse Output
Diaphragm Meters Diaphragm Meters
n n Manufacturers Manufacturers – – Canadian Meter Canadian Meter – – Invensys Invensys – – Schlumberger Schlumberger – – National National
Metering Metering Proving Proving
Meter Proving and Proof Meter Proving and Proof
n n Diaphragm meters are proved/calibrated Diaphragm meters are proved/calibrated on either a Bell prover or a Sonic Nozzle on either a Bell prover or a Sonic Nozzle prover. prover.
n n The accuracy of the diaphragm meter is The accuracy of the diaphragm meter is defined in percent accuracy , percent proof defined in percent accuracy , percent proof or error. or error.
Metering Metering Types of Meters Types of Meters n n A. Positive Displacement A. Positive Displacement
– – 1. Diaphragm 1. Diaphragm – – 2. Rotary 2. Rotary – – 3. Wet Test 3. Wet Test
Wet Test Meters Wet Test Meters
n n Wet Test Meter Wet Test Meter – – A,B,C,D A,B,C,D Metering Metering Compartments Compartments
– – a,b,c,d a,b,c,d Compartment Inlets Compartment Inlets
– – a a’ ’,b ,b’ ’,c ,c’ ’,d ,d’ ’ Compartment Outlets Compartment Outlets
– – E E Gas Inlet Gas Inlet
Metering Metering Types of Meters Types of Meters n n A. Positive A. Positive Displacement Displacement – – 1. Diaphragm 1. Diaphragm – – 2. Rotary 2. Rotary
Rotary Meter Rotary Meter
n n Components Components – – Impellers Impellers – – Cylinder Cylinder – – Headplates Headplates – – Timing Gears Timing Gears and Magnetic and Magnetic Drive Drive
– – Index Index – – TC Module TC Module
Rotary Meter Rotary Meter
n n Principles of Operation Principles of Operation – – Demand initiates flow Demand initiates flow through the meter. Left through the meter. Left impeller turns counter impeller turns counter clockwise and right clockwise and right impeller turns clockwise. impeller turns clockwise.
Rotary Meter Rotary Meter
n n Principles of Principles of Operation Operation – – A definite volume of A definite volume of gas is captured by the gas is captured by the left impeller. left impeller.
Rotary Meter Rotary Meter
n n Principles of Principles of Operation Operation – – Measuring cavity Measuring cavity opens releasing the opens releasing the captured gas captured gas downstream. downstream.
Rotary Meter Rotary Meter
n n Principles of Principles of Operation Operation – – The meter cycles four The meter cycles four times completing one times completing one revolution. revolution.
Rotary Meter Rotary Meter
n n Meter Meter Capacity Capacity n n Size Size (CFH) (CFH)
– – 8C 8C 800 800 – – 9C 9C 900 900 – – 1M 1M 1000 1000 – – 11C 11C 1100 1100 – – 15C 15C 1500 1500 – – 2M 2M 2000 2000 – – 2.5M 2.5M 2500 2500 – – 3M 3M 3000 3000 – – 3.5M 3.5M 3500 3500
n n Meter Meter Capacity Capacity n n Size Size (CFH) (CFH)
– – 5.5M 5.5M 5500 5500 – – 6M 6M 6000 6000 – – 7M 7M 7000 7000 – – 9M 9M 9000 9000 – – 11M 11M 11000 11000 – – 16M 16M 16000 16000 – – 23M 23M 23000 23000 – – 56M 56M 56000 56000 – – 102M 102M 102000 102000
Rotary Meters Rotary Meters
n n Installation Installation – – Filter or Strainer Filter or Strainer – – Use Non Use Non lubricating lubricating Valves Valves
– – Level Set Level Set ( (+ +1/16 1/16” ”/Foot) /Foot)
– – Impellers Move Impellers Move Freely Freely
Rotary Meter Rotary Meter
n n Manufacturers Manufacturers – – Canadian Meter Canadian Meter – – Instromet Instromet – – Dresser Dresser – – Romet Romet
Metering Metering Types of Meters Types of Meters n n A. Positive A. Positive Displacement Displacement – – 1. Diaphragm 1. Diaphragm – – 2. Rotary 2. Rotary – – 3. Wet Test 3. Wet Test
n n Inferential Inferential – – 4. Turbine 4. Turbine
Turbine Meter Turbine Meter
n n Components Components – – Body Body – – Measuring Mechanism Measuring Mechanism – – Output and Readout Device Output and Readout Device
Turbine Meter Turbine Meter
n n Principles of Principles of Operation Operation – – Velocity Meter Velocity Meter – – The faster the gas The faster the gas flows through the flows through the meter, the faster the meter, the faster the rotor turns. rotor turns.
Turbine Meter Turbine Meter
n n Gas velocity Gas velocity increases as the increases as the diffuser decreases the diffuser decreases the cross cross sectional area sectional area of flow. This of flow. This improves low end improves low end performance of the performance of the meter. meter.
Turbine Meter Turbine Meter
Pressure (PSIG)
3” 45º (SCFH)
4” – 45º (SCFH)
6” – 45º (SCFH)
8” 45º (SCFH)
0.25 10,000 18,000 35,000 60,000
50 44,000 80,000 154,000 265,000
100 79,000 142,000 276,000 474,000
200 150,000 271,000 526,000 902,000
500 379,000 695,000 1,328,000 2,276,000
Based on P atm = 14.37 psia & P base = 14.73 psia
Turbine Meter Turbine Meter
n n Options Options – – High Frequency Inductive Pulser High Frequency Inductive Pulser – – Dual Rotor Dual Rotor Self Testing Self Testing – – Instrument Drive Instrument Drive – – Electronic Corrector Electronic Corrector
Turbine Meter Turbine Meter
n n Installation Installation – – Recommended Recommended
Turbine Meter Turbine Meter
n n Typical Installation Typical Installation
Turbine Meter Turbine Meter
n n Manufacturers Manufacturers – – Canadian Meter Canadian Meter – – Instromet Instromet – – Equimeter Equimeter – – Daniel Daniel
Metering Metering Types of Meters Types of Meters
n n A. Positive A. Positive Displacement Displacement – – 1. Diaphragm 1. Diaphragm – – 2. Rotary 2. Rotary – – 3. Wet Test 3. Wet Test
n n B. Inferential B. Inferential – – 4. Turbine 4. Turbine – – 5. Orifice 5. Orifice
Orifice Meters Orifice Meters
n n Q=C Q=C’ ’{(h {(h w w x (p x (p f f )} )} 1/2 1/2
n n Where Where – – Q = Volume MSCF Q = Volume MSCF – – h h w w = Differential = Differential Pressure ( Pressure (“ “w.c.) w.c.)
– – p p f f = Static Pressure = Static Pressure (PSIA) (PSIA)
– – C C’ ’ = = F F b b xF xF r r xYxF xYxF pb pb xF xF tb tb xF xF tf tf x x F F g g xF xF pv pv xF xF m m xF xF a a xF xF l l
Metering Metering Types of Meters Types of Meters
n n A. Positive Displacement A. Positive Displacement – – 1. Diaphragm 1. Diaphragm – – 2. Rotary 2. Rotary – – 3. Wet Test 3. Wet Test
n n Inferential Inferential – – 4. Turbine 4. Turbine – – 5. Orifice 5. Orifice – – 6. Other Methods 6. Other Methods
Other Methods Other Methods Ultrasonic Metering Ultrasonic Metering n n Manufacturers Manufacturers
– – Instromet Instromet – – Daniel Daniel
Instrumentation Instrumentation
n n Electronic Correctors Electronic Correctors
Instrumentation Instrumentation
n n Benefits of Electronic Devices Benefits of Electronic Devices – – Improved Accuracy ( Improved Accuracy (+ + 0.5%) 0.5%) – – Ease of Calibration Ease of Calibration – – Acquire, Process, Store and Send Data Acquire, Process, Store and Send Data – – Audit Trail Audit Trail – – Reports and Alarms Reports and Alarms – – Communication Options Communication Options
Thank you!
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