Hi Gumbiratno - you need to ...

Hi Gumbiratno - you need to say what pressure, diameter, length and environment (buried, outside in daylight etc) to inform the decision. You also need to decide on how critical you regard the pipeline. Do you want to bury it and forget it for ever (would perhaps lean toward stainless steel as used in nuclear installations) or are you happy to replace frequently and monitor its condition / deterioration to actively asset manage it?  

Sorry it's not straightforward but perhaps you could provide more background?