Working on LNG piping system (Cryogenic). Received pipe spools from another vendor upon inspection it was noted the piping had really bad deposits on the internal surface of the piping. It was decided to remove the deposits by light grit blasting which was very successful. Please note the blast medium has 10% to 20% iron oxide. Piping system installation is in two phases. Phase one is to install the main pipe runs & end cap & put system under nitrogen purge for approximately 12 to 14 months. Second phase is to complete final tie-ins to auxiliary equipment after all of the final tie-ins are complete the complete piping system will be flushed & passivated @ this time. My question is can the first phase of installation be passivated at the completion of phase two.
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