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11.12 On the question as to whether the sweetening of gas is a process leading to new marketable gas, the learned counsel submitted that what has been agreed upon by the Production Sharing Agreement is delivery of sweetened gas onshore at Hazira. It was submitted that the petitioners have contended that under the Production Sharing Contract, the sale is of natural gas delivered at the upstream weld, but such gas delivered at the upstream weld is not the same as agreed by the Union of India and GAIL. The sour gas becomes a product which is marketable only after it is sweetened by processing and it is this marketable product that the buyer had agreed to purchase. Therefore, the sweetening of the Natural Gas results in making the sour gas a marketable product. In support of his submission, the learned counsel placed reliance upon the decision of the Supreme Court in the case of Association of Natural Gas and Others v. Union of India and Others, AIR 2004 SC 2647, wherein it has been observed that to obtain a marketable product, the raw material gas flowing from gas or oil wells must be processed to remove water vapour, inert or poisonous constituents and condensable hydrocarbons. The processed gas is principally methane, with small amounts of ethane, propane, butane, pentane, carbon dioxide and nitrogen. This gas can easily be transported from the producing areas to the market in underground pipelines under pressure or liquefied at low temperatures and transported in specially designed ocean-going tankers. The composition of natural gas at the wellhead varies from field to field. Many undesirable components may be present that must be removed by processing before delivery to the pipeline. It was submitted that, therefore, the sour and unsweetened gas can only be marketable after undergoing the sweetening process. No further authenticated statement is required in this regard.