RFM Flare Gas Meter
RFM FGM 130
The Roxar Flow Measurement (RFM) FGM 130 has been developed to Operating principle
measure flare gas in pipes where low pressures, a wide range of
The RFM FGM 130 measures gas velocity based on the time-of-flight
velocities and large pipe diameters represent a problem. Roxar Flow
technique. The ultrasonic transducers are mounted at an angle to the
Measurement offers world-class flare gas meters characterised by:
pipe. Both transducers transmit and receive pulses and the transit time
Optimised signal processing and acoustic sensors enabling is measured.
flow measurement up to 100 m/s
Improved signal processing When gas is flowing in the pipe, the pulse travelling against the flow
Sensor with better acoustic properties takes longer to reach the opposite transducer than the pulse travelling
Minimum interfacing with the flow. This time difference is used to calculate the velocity of
Simplified field installation the flowing medium.
One flow computer handles up to three pairs of transducers
Low maintenance Installation
Compact system RFM FGM 130 has specially designed jigs for fast, economical and accurate
Low power consumption mounting of transducer holders. These holders are welded onto the pipeline
Serial interface based on Modbus protocol at an angle suitable for each different pipe size.
Non-intrusive design for all pipe sizes
Widest velocity range on the market
High measurement accuracy throughout entire range
Unique signal processing ensures high accuracy at low flow rates
Fast response time
BASEEFA-certified for operation in hazardous area
No calibration required after installation
Rapid installation gives reduced costs
Low maintenance requirements
Measurement of flare gas, characterised by a large velocity
range, low pressure and large pipe diameters
Flare gas density calculations for gas composition indications
Leak detection and loss calculation for mass balance in
Accurate measurements of very low flow
rates in flare systems
RFM FGM 130
RFM Flare Gas Meter
System performance and characteristics
Pipe size: 6-in. diameter minimum, 72-in.
Velocity range: 0.05–70 m/s for 72 in., 0.05–100 m/s for
36 in., 0.20–100 m/s for 8 in.
Uncertainty at 95%
confidence level (fully Normal operating pressure: 0.8–10.0 barA
developed flow): 2.5% of measured value in range up to 25 m/s Weight: 10.5 kg each, excluding valve
5% of measured value in range 25–100 m/s and socket
Resolution: 0.01 m/s (36-in. pipe) Dimensions: Length 0.7 m (transducer unit)
Repeatability: Better than 1% of volume flow with velocity Signal transmission: Via optical-fibre cable
0.3–100 m/s Electrical safety: Intrinsically safe (zone 0)
Calibration: 0.3–70 m/s with fully developed turbulent Safety class: EEx ia IIC T6
flow profile BASEEFA approval: Cert. no. Ex 86B2411, Ex 872089
Turndown ratio: 2000:1
Installation: 10D upstream and 5D downstream Input/output
Mechanical and electrical components Flow computer and signal processor mounted in 19-in. rack with
power supplies. An Ex-d version is available.
Mains supply: +24 V DC,110/220V AC, 50–60 Hz
Power consumption: 75 VA maximum Input
Velocity: Signal from transducers via optical-
Mounted in 19-in. rack, with alphanumeric display and data One computer supports three system
entry/function keyboard. Eight-digit, non-resettable LCD counter. sensor pairs
Display functions: Volume flow rate, Sm3/hr Temperature: 4–20 mA or HART comm.
Total volume, Sm3 Pressure: 4–20 mA or HART comm.
Mass flow rate, kg/hr Specific gravity: 4–20 mA (optional)
Total mass, kg Output
Temperature, ˚C The FGM 130 has eight analogue 4–20 mA output channels that can
Pressure, barA be programmed to any of the following: standard volume flow, actual
Specific gravity/density, kg/m3 density, actual volume flow, molecular weight, mass flow, alarm low,
Velocity, m/s alarm high, density (standard conditions), temperature or pressure.
Spanish text and US units available upon request. Additional connections for: Counter
Operating temperature: -70 to +150˚C
based on Modbus protocol
For further information contact:
Solheimsgaten 9, PO Box 2364, Solheimsviken, N-5824 Bergen, Norway
Tel: +47 55 59 95 55 Fax: +47 55 59 95 00
Email: firstname.lastname@example.org or email@example.com or visit www.roxar.com