Procedure to add a 4" and 6" nozzle to pressure vessel
Procedure to add a 4" and 6" nozzle to pressure vessel
(OP)
Hey Guys,
I have a oil treater pressure vessel I want to add in 2 nozzles. The reason I'm doing this is because we have some corrosion we want to cut out and replace it with a nozzle instead of a flush patch to waive the complete hydro test of the vessel and stick with a local hydro test. Could someone point me in the right direction as to where I would find and example procedure or something of the type to build a procedure for this.
I have a oil treater pressure vessel I want to add in 2 nozzles. The reason I'm doing this is because we have some corrosion we want to cut out and replace it with a nozzle instead of a flush patch to waive the complete hydro test of the vessel and stick with a local hydro test. Could someone point me in the right direction as to where I would find and example procedure or something of the type to build a procedure for this.





RE: Procedure to add a 4" and 6" nozzle to pressure vessel
RE: Procedure to add a 4" and 6" nozzle to pressure vessel
Restoration by encapsulation without removal of the degraded area is not prohibited by the NBIC per Interpretation 04-01
This method of restoration can be very cost effective as the degraded area does not have to be removed thus saving fit-up, welding, and examination installation time and avoiding entry of foreign matter into the vessel.
The Encapsulation component attachment weld is typically classified as an ASME Category D weld that would not require volumetric examinations.
The AI has the authority to waive the hydrostatic pressure test.
Typically, a liquid penetrant or magnetic particle examination is performed on the root and final pass of the full penetration encapsulation to shell attachment weld. See NBIC Interpretations 98-33 and 98-38.
Alternatively, the encapsulation component can be supplied with a pressure port for local pressure testing – see NBIC Interpretation 01-15
I suggest you search the internet using the keywords such as asme - vessel - restoration by encapsulation, etc.
Let me now if you need any further help on this method of restoration for which I am extremely familiar
RE: Procedure to add a 4" and 6" nozzle to pressure vessel
RE: Procedure to add a 4" and 6" nozzle to pressure vessel