Extensive qualitative & quantitative risk assessment and followed by integrity assessment (ECDA, ICDA, SCCDA, mechanical integrity, geohazard study) have currently been performed on West Java Gas Pipeline- Indonesia. Almost 780 Km length of pipeline becomes a backbone that is transmitting natural gas collected from many resources in northern part of Western Java to Jabotabek until Cilegon heavy industry areas. Result from the assessment shows that under existing working pressure around 20 Ksc, the aging pipeline (25 years of age) generally still has a very high reliability and mechanical integrity. It is expected to have a long remaining life time (> 30 years). However the right of way is constantly facing third party damage threats since it consist of various populations, densities along pipeline routes associated with illegal occupation practices caused by recent heavy urbanization. To mitigate the risk and to manage the pipeline integrity associated with this potential third party damage, various practical solutions and recommendations are proposed so that the pipeline can safely be operated.