Is this your first assignment flushing, purging and testing LPG facilities ?
Give us more specific details about your tanks, piping and ambient conditions .... Purging of systems involves developing a detailed plan and implementing it
Where is in world are you located ?.... Yes, it does make a difference in the purge plan.
Will you be establishing an overall purging plan and calculating the amount of purge gas required ?
In use for many decades, "The PURGING PRINCIPLES AND PRACTICES Guideline" by the American Gas Association recommends a nitrogen purge..
Carbon dioxide has been also been used in the past, but is now expensive and out of favor
The AGA documents are the most authoritative source that I know about and have been the reference sources for many decades
MJCronin
Sr. Process Engineer