Section 5(3)(vi) in The Petroleum and Natural Gas Regulatory Board (Determining Capacity of Petroleum, Petroleum Products and Natural Gas Pipeline) Regulations, 2010
(vi)Velocity - The maximum allowable velocity of natural gas or petroleum product in the pipeline shall be 20 m/sec in case of natural gas pipeline and 2 m/sec in case of petroleum product pipelines or as per relevant regulations on Technical Standards and Specifications including Safety Standards whichever is lower, if specified.