Section 5(3)(ix) in The Petroleum and Natural Gas Regulatory Board (Determining Capacity of Petroleum, Petroleum Products and Natural Gas Pipeline) Regulations, 2010
(ix)Gas composition - The gas composition indicating all components totaling 100% by volume is to be given with the level of impurities as per Schedule II of the Petroleum and Natural Gas Regulatory Board (Access Code for common or contract carrier Natural Gas Pipelines) Regulations, 2009. From this, necessary input to the flow equation shall be worked out.