Section 2(1)(q) in The Petroleum and Natural Gas Regulatory Board (Determining Capacity of Petroleum, Petroleum Products and Natural Gas Pipeline) Regulations, 2010
(q)"steady state condition" means calculation carried out based on time-invariant pressure, temperature and flow profiles throughout a pipeline using specified boundary conditions. In other words, the steady-state run calculates the hydraulic state of a pipeline system operating at equilibrium with input and output balance;