... molarities of mixture p1: input pressure, kPa p2: output pressure, kPa d: diameter of pipeline, m γ g : gas density, kg/m3 (6) (7) • T: temperature of fluid flow, K • Zav: averaged coefficient of compressibility ... roughness of pipeline Rewriting the above equation for gas flow in the pipeline: ( ) p2 − p12 = −0.2510 × qsc psc Z ⎡ γ g Tav Lf ⎤ × p pcTsc ⎢ d ⎥ ⎣ ⎦ 0.5 (11) PRESSURE DROP ALONG THE GAS PIPELINE: ... table 3.1 along the associated gas pipeline of flow equations of Weymouth, Panhandle A, Panhandle B and Clinedinst are stored in table 3.2a and 3.2b Table 3.2a Pressure along associated gas pipeline...