Page 53 - Flip IOCL Book.cdr
P. 53

Recommendations

            1.   Additional Support to be provided in Line from 107-E-008B to 107-V-017B to minimize vibration.

            2.   Stiffener supports to be provided in small bore tapings which was not considered in design.




             Case 35                              Date: 06.10.2020                       Time: 19:00 hrs.


             Incident

            During charge pump (107-P-003B) normal change over activities, hydrocarbon vapors observed coming
            out from common minimum circulation line HPV (3/4”) of charge pump (107-P-003A/B). During checking
            weld crack was found in HPV tapping. Pump was stopped immediately, feed-out was done and system
            was handed over for leak rectification after proper flushing, purging.



                                                                             HPV tapping (3/4 inch)






                                                                             Crack in weld Joint




                                                                                Main Pipe










             Root Cause

            Minor vibration in small bore pipe (HPV pipe piece) propagated to weld joint also and led to cracking in

            weld joint.


             Recommendations

            The portion of pipe having this HPV connection to be replaced with straight pipe spool piece of

            recommended metallurgy.


















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