HYDRO-TEST AFTER REPAIR TO NEW VESSEL 2

[roca]

I have a an ASME VIII Divison 1 vessel which is now finished, tested and sitting at site.
However one nozzle is of an incorrect size. We need to replace this nozzle with a larger one.
Welding will be done with an approved weld procedure at site.
Welds wll be 100% Dye Penetrant tested.
My question is - do we need to re do the ASME code hydrotest as we have cut into the vessel pressure envelope.
If I were just welding a an external pipe support clip to the vessel without cutting the shell / ends then I would not apply another hydro-test
Any comments / help will be most helpful

 

[roca]

Aybee - You hit the nail on the head.
The equipment has now been modified, NDE applied, has been hydro-tested and the client is happy too.
For the record the vessel details were :-
Amine Drain Tank
DP 3.5 barg / FV @ 120°C
I.Dia = 2100
Thk = 9 mm
6" NB Nozzle replaced with a 10" NB
Contents - Amine Solution + Hydrocarbons
Thanks for all the replies )