Onshore gas production facilities commonly consist of network of flow lines feeding the gas inlet manifold before processing. A number of operators use duplex stainless steel (DSS) as one of the material of construction (MOC) for gas flow lines due to their good corrosion resistance which should avoid extensive maintenance and provide high availability of gas production. However DSS can still be susceptible to internal and external corrosion threats in both surface and buried environments. The threat of corrosion can be effectively managed if DSS flow lines are operating within integrity operating window (IOW) and the material limits are clearly understood. For these reasons effective corrosion management of gas flow lines is one of the core requirements in maintaining the integrity of gas assets and extending their period of operation beyond their design life. This paper will present a methodology for corrosion management of DSS flow line installations. This paper will also discuss flow lines preservation strategy during the long periods of well shutdowns and threats associated with stray current interference.