Dear Nilesh ,
After Purging plz give some time to demolish the atmosphere air. and check whether any impurities present inside the pipe and near the weld joint. close the both end of pipe with some closer. one end is supplied by purging hose and another end you make a fine hole to have a flow of the purging gas outside. If you close the welding portion from outside 75% other than the welding it will be better. other than that you better check other specifications as mentioned other mails.
Regards,
J.C.Andrews
QA/QC Engineer
Doha-Qatar.
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