Section 2(1)(o) in The Petroleum and Natural Gas Regulatory Board (Determining Capacity of Petroleum, Petroleum Products and Natural Gas Pipeline) Regulations, 2010
(o)"spur-line" means a pipeline necessarily originating or branching out from the trunk or transmission pipeline or Sub-transmission line or another spur line or from a terminal station on the existing transmission or trunk pipeline with diameter and capacity not greater than the trunk or transmission pipeline but having no compression facility for supply of natural gas to one or more consumers. Any pipeline having a separate gas source or a compressor shall not be treated as a spur-line. The length of Spur line may not depend upon the length of the trunk pipeline. A spur-line must use the capacity of trunk pipeline in order to transport gas. Spur line includes branch line also;