AlderleyApplication Notes

Natural Gas Metering

Berantai Gas Field

Project Name: Berantai Field Development

Location: Block PM 309 of the South China Sea, approx. 150km offshore Malaysia

EPC Contractor/Consultants: Petrofac International (UAE) LLC

End User: Petrofac/Petronas

Scope of Application

The scope of supply consists of a gas fiscal metering system, supplied to the Petrofac/Petronas joint venture for use in the development of the Berantai Field offshore development in Malaysia.

The FPSO based metering package has two 50% streams for export (flow rate of up to 200,000 kg/h) and a single 100% stream for import. All streams utilise ultrasonic meter technology. The package also includes the associated control and supervisory systems, plus an analyser shelter c/w gas chromatograph, dew point analyser, oxygen analyser and a separate auto and manual sampling system.

Alderley also supplied a crude oil custody transfer metering system to the Berantai Project.

Technical excellence: delivered

Alderley

www.alderley.com

Applicable Standards

AGA 5: Fuel Gas Energy MeteringAGA 8: Compressibility Factor of Natural Gas and Related Hydrocarbon GasesAGA 9: Measurement of Gas by Multipath Ultrasonic MetersAGA 10: Speed of Sound in Natural Gas and Other Related Hydrocarbon GasesISO 5024: Petroleum liquids and gases – Measurement – Standard reference conditionsISO 5168: Measurement of fluid flow – Estimation of uncertainty of a flow-rate measurementISO 6143: Gas Analysis – Determination of composition of calibration gas mixturesISO/DIS 17089: Measurement of fluid flow in closed conduits – Ultrasonic meters for gas – Part 1: Meters for custody transfer and allocation measurement

Main Equipment

• Single skid of compact design 10.0m L x 2.5m W x 4.0m H• 2 x 50% Export streams, 1500# RTJ 8” ultrasonic flow meters (200,000 kg/h)• 1 x 100% Import stream, 1500# RTJ 2” ultrasonic flow meter (2,800 kg/h)• 8 x 8” Actuated/manual main line ball valves• 4 x 2” Actuated/manual main line ball valves• Small bore valves for drain, vent connections and transmitters/gauge isolation• Pressure and temperature instrumentation• Analyser shelter c/w gas chromatograph, dew point analyser, oxygen analyser and separate auto and manual sampling system• Control system including S600+ flow computers

Rev. 1