FGM 160 Ultrasonic Flaregas meter. Flare Gas Measurement

Transcription

1 Fluenta Overview

2 FGM 160 Ultrasonic Flaregas meter Flare Gas Measurement

3 Why Measure Flare Gas? Flare systems at offshore production platforms, refineries and chemical plants are primarily installed for safety purpose. Flare gas measurement systems are primarily installed for: Leak detection Mass balance Environment National legislation CO 2 tax (in some countries)

4 Flare Gas Measurement Challenges Large pipe diameters. Large gas flow velocity ranges. Low pressure. Hazardous area. Dirt, wax, condensate and particles.

5 Fluenta Flaregas meter The #1Ultrasonic Flare Gas Meter on the Market Non Intrusive for all pipe diameters. High accuracy (± %). Measures velocities up to and above 100m/s Turn Down of 3330 : 1 Intrinsically i safe sensors (EEx ia IIC T6). Handle large temperature variations ( C). (tested to C). Compact Ex de Field Computer solution

6 Fluenta Flaregas meter Features: Single path system Field transmitter solution No moving parts Easy to install and operate Requires minimum maintenance EEx de

7 Ultrasonic Time-of-Flight Flow Meter Features: Causes no pressure drop. Does not obstruct the process flow. No mechanical moving parts - reduced maintenance costs. High turn-down ratio. Self-diagnostic capabilities. High temperature range. Fast response time. Good repeatability. Sensors can be replaced during operation. Not dependent on gas quality.

8 Advantages Causes no pressure drop Does not intrudes with the process flow No mechanical moving parts- - Reduced maintenance costs High turndown ratio Self-diagnostic capabilities High temperature range Fast response time Good repeatability Sensors can be replaced during operation

9 Fluenta Flaregas meter - Principle D Measurement of: Flow velocity D t 2 v = D sin 2 θ t t t t t 1 v Velocity of sound c = D sin 2θ ( t t 21 ) cos θ + ( t 21 t12 ) sin t 21 t 12 2 θ

10 Robust Signal Processing Techniques Transit times measured with crosscorrelation and phase detection. t 12 t 12 The excitation signal is optimised for high and low velocities: t 21 Combination of Continuous Wave (CW) and Chirp is used for low velocities. Chirp signal (varying frequency, defined shape and duration) is used for high velocities. Robust velocity measurements even at velocities up to 100 m/s

11 Characteristic of a Chirp Signal Amplitud de A t1 T t2 a) Time b) Fr requency f2 f f1 B t1 t2 Time Amplitu ude c) Time t t1 t t2

12 Combined Signal Measurement Cycle Return

13 Field Computer 460 mm Return 280mm Weight 17 kg 250 mm 260 mm

14 Field Computer Exd Box Home

15 Field Computer Exe Box

16 Field Computer

17 Field Computer Display board I / O board DPS Board P & T Board F-End El Board IS Barriere Board

18 Field Computer

19 Installation of transducer holders Complete installation ti with ball valve and sensor

20 Measure Flare Gas... Technical Specification and optimise production

21 Technical specifications Measurment technology: Mounting: Ultrasonic time-of-flight Non Intrusive for all pipe diameters. (45 deg full profile measurement) Pipesizes: i 6 and larger (smaller pipesizes are available on request) Accuracy: ±2.5-5 %. Velosity range: 0, m/s (and above) Turn Down: 3330 : 1 Resolution: 0,0008 m/s Repeatability: Better than 1%

22 Technical specifications Transducers -Operation temperature: deg C (transducer) -Design temp: deg C (transducer) -Operating pressure: 0,8-10 Bara -Design pressure: 20 Bar a (transducer) -Material: SS316 / Titanium -Safety class: Ex ia IIC T6 intrisically safe

23 Technical specifications Computer -Power: -Consumption: -Housing material: -Dimentions: 24 VDC ( option) 12 W maximum SS x 280 x 250 mm (HxWxD) -Ingress Protection: IP 66 -Electrical Classification: -Operation temperature: Explosion proof Ex de (ia) IIC T5-T deg C (electronics)

24 Technical specifications Communication -Input signals: -Output: -Optional output: Cable -Power cable: -Instrument cable: -Signals from transducers via std. instr. cable -Temp and press 4-20mA or HART 3 x 4-20mA analog output RS 422/485 Serial port (Modbus) Additional 3 x 4-20mA Channels HART Puls / frequency signal Standard twisted pair RFOU (i) 2 x 2 x 0,75 mm 2 Standard twisted pair RFOU (i) 5 13 x 2 x 0,75 mm 2

25 Fluenta FGM Field Computer ABLE Instruments & Controls / Fluenta

26 Full Size transducer