Be free of particulate solids and liquids water to prevent erosion, corrosion or other damages to the pipeline.Dew-point adjustment serves the reduction of the concentration of water and heavy hydrocarbons in natural gas to such an extent that no condensation occurs during ensuing transport in the pipelines.Be delivered at or above a specified hydrocarbon dew point temperature (below which some of the hydrocarbons in the gas might condense at pipeline pressure forming liquid slugs that could damage the pipeline).Be within a specific range of heating value(caloric value) for example, in the united states, it should be about 1035±5% BTU per cubic feet of the gas at 1 atmosphere and 60 0 (41 MJ ±5% per cubic meter of gas at 1 atmosphere and 15.6 0 c).In general, the standards specify that the natural gas: These quality standards vary from pipeline to pipeline and are usually a function of a pipeline system design and the markets that it serves. The raw natural gas must be purified to meet the quality standard specified by the major pipeline transmission and distribution companies. A fully operational plant delivers pipeline-quality dry natural gas that can be used as fuel by residential, commercial and industrial consumers. Some of the substances which contaminate natural gas have economic value and are further processed or sold. Natural gas processing plants purify raw natural gas by removing common contaminants such as water, carbon dioxide (CO 2 ) and hydrogen sulfide (H 2s). Natural gas production absent any association with crude oil is classified as “non-associated”. The natural gas produced from oil wells is generally classified as associated- dissolved, meaning that the natural gas is associated with or dissolved in crude oil. Oil and natural gas are often found together in the same reservoir. The composition of the raw natural gas extracted from producing wells depends on the type, depth and location of the underground deposit and the geology of the area. Natural gas processing begins at the well head. Natural gas processing is a complex industrial process designed to clean raw natural gas by separating impurities and various non-methane hydrocarbons and fluids to process what is known as pipeline quality dry natural gas (^ Fact sheet: Natural gas processing). 47ģ.3 Fluid package used (Thermodynamics property used). 47ģ.2 Component selected for the simulation in Aspen Hysys. 39Ģ.8.3 DEHYDRATION BY USING TRIETHYLENE GLYCOL (TEG). 31Ģ.8 THE GLYCOL GAS DEHYDRATION PROCESS. 20Ģ.6.2 TYPES OF DEHYDRATION OF NATURAL GAS. The research question of this project is based on the following 15Ģ.3 PROCESSES IN OFFSHORE PRODUCTION. which might have resulted due to loss of some of the gases at certain stage of the process. At the end of the converged simulation, 89.92 wt% methane was recovered at a flow rate of 9177kg/hr. The units involved in this simulation are Contractor, Regenerator, Valve, Component splitter, Cooler, Stripper and Splitter, alongside with an adjust logical tool which was used to find the point at which water is just formed (dew point with a temperature of -13.67 Oc). The composition of the natural gas has been provided on a water-free basis, therefore to ensure water saturation it was mixed with water before entering the first unit operation. TEG was used because it has gained nearly universal acceptance as the most cost effective of the glycols due to its superior dew point depression, operating cost and operational reliability. This is important in an FPSO since the removal of water from natural gas is necessary before processing, and due to the fact that Natural gas from the reservoir contains large amount of water which can cause several problems to downstream processes and equipment. The objective of this experiment is to carry out a simulation on TEG dehydration unit using AspenHYSYS process software. The process of dehydration by using TEG is absorption, involves the use of a liquid desiccant to remove water content from the gas. The four major methods of dehydration are absorption, adsorption, gas permeation and refrigeration. The mixtures of water in natural gas can cause the problems for the production operation, transportation, storage and use of the gas. Dehydration of natural gas is the process removal of the water that is associated with natural gases. Water vapor in natural gas stream, poses threat to process facilities if the dew point temperature is not properly controlled. The dehydration of natural gas is very essential in the gas processing industry to remove water vapor. It is usually produced saturated with water vapor under production conditions. Natural gas is an important energy source among other sources of fossil fuels. SIMULATION OF GAS DEHYDRATION ON AN FPSO USING ASPEN HYSYS