Hydrostatic test after modification of vessel 1

[PAN]

If the vessel is in service, we modify it in the shutdown period.

Refer to thread794-114267, in case of fillet welding (no fusion on base metal), should we perform hydrostatic test again?

Please comment.

 

[metengr]

PAN;
If the vessel is in service, in my opinion this falls under the NBIC (the National Board Inspection Code).

IF the welding can be classified as a repair versus an alteration (you indicate modification, which could be an alteration but there is not enough information in your post to indicate this);

the answer is NO.

IF the modification is classified as an alteration regardless of the fillet welding;

the answer is YES.