Water Content of Sweet Natural Gas: A Simplified Formula-Based Approach

Gas with negligible or zero composition of hydrogen sulphide is sweet natural gas. During production, transportation and processing, the presence of traces of water can cause problems such as ice formation and/0r the problem of gas hydrates, increase in corrosion potential of the gas and two-phase flow problems if condensation occurs. Calculation of the water content at specified temperature and pressure conditions is the first step. A formula based approach of the calculation is proposed, and comparison with existing formulas presented. Application of the proposed formula in the specified ranges of temperature and pressure conditions of 15oC (59oF) to 48.8oC (119.84oF) and 1.07MPa (155.19 psia) to 10MPa (1450.38 psia) is recommended for sweet natural gases. A calculated Mean Absolute Percentage Deviation (MAPD) of 16.4077% from the experimental data is the statistical indicator used for validity check. It predicted better than some existing models which are adaptable under certain conditions. Only a hand-held device is required as the proposed model is highly simplified.