| Summary: | Globalization has since boosted the world-wide demand for Town Gas. At a national level the increase in commercial, residential and various other infrastructures has resulted to an increase in demand for Town Gas. PowerGas Limited a subsidiary of the Singapore Power Group is the sole gas transporter and gas system operator licensed by the Energy Market Authority (EMA) to deliver both Natural Gas and Town Gas. As per regulatory requirements and PowerGas’s commitment to quality, the integrity and reliability of the Gas supply must not be compromised. This arises for a need of an additional local flow monitoring system or device to keep the extensive distribution network in check as well as to balance the load demand.
In the course of this project, a series of experiments were done on a test skid at the Fluid Mechanic’s Lab in NTU. The skid set-up comprises of a wind tunnel, filter, slam shut valve and turbine gas meter with the rationale of simulating the actual working conditions of a distribution network regulating station of Town Gas. The experiments were done in compliance with the British Standard; BS ISO 3966:2008 to study and test for the accuracy of using pitot static tubes for volumetric air flow measurement.
Experiments were carried out using a Standard Airflow Pitot Static Tube, an NTU engineered Single Port Pitot Static Tube and Averaging Pitot Static Tube. These instruments were used in comparison with the Gas Turbine meter to study the accuracy, reliability and repeatability of the NTU engineered Pitot Static Tubes and to validate the accuracy of a similar project carried out last year.
The results obtained were consistent with minor errors contributed by various systems and experimental issues. Overall the fabricated Brass Pitot static tube and Averaging Pitot static tube is feasible for use on the test skid in NTU.
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