Pemodelan dan Analisis Pengaruh Penambahan Orifice Plate menggunakan Software Ansys di Perusahaan Gas Alam PT. X

Abstract

Increased natural gas production capacity of PT. X in East Java experienced condensation problems due to the addition of orifice plate which reduced the pressure from 650 psi to 50 psi, causing a temperature difference in the pipeline and environment. It also causes erosion due to changing flowrate then become turbulent flow. The velocity value will determine the value of Re, this calculation aims to prove that changing of gas flowrate after the orifice occurs changes in flow characteristics of the laminar flow into turbulent flow, after that it determines the value of the erosion rate, the amount of mass of the area unit lost, the minimum thickness, lifetime value, also modeling using Ansys software. Analytical method that used in this research is variations analysis in the addition of orifice plate. Based on the test results, the value of the change in velocity was obtained from 2.805 m/s to 41 m/s; erosion rate 0.133 mm/year; the mass of the unit area lost is 3.491 x 10-9kg per second per 1 m2 in the area of the inner wall of the pipe, the minimum thickness of the pipe is 0.866; 0.499; 0.150; and the lifetime of the pipe is 31 years; 34 years old; and 36 years. In CFD modeling, there is a change in laminar flow to turbulence.