Analysis of Flow Patterns in 55 Kilometers of Gas Transmission Pipelines due to Changes in Gas Supply Flow Rate

Abstract Pressure drop will cause a decrease in the temperature of natural gas in the pipe. This causes a two-phase flow to form along the pipe. The prediction of the two-phase gas-liquid flow pattern is needed in the oil and gas industry. The changes in gas supply will affect the flow pattern in the pipeline. The flow pattern in the pipe will be analyzed by Unisim software. The flow pattern result shows that there are instabilities of flow patterns along the pipe due to changing topographic conditions. When the pipe elevation drops to zero, as in kilometers 40-55, the flow pattern formed is constantly stratified flow. The results of stratified flow patterns indicate that the flow patterns do not cause sudden changes in liquid flow rate on the Receiving Facility (RF) equipment.