GRINDING INSIDE PRESSURE VESSEL AFTER Hydrotest
GRINDING INSIDE PRESSURE VESSEL AFTER Hydrotest
(OP)
Good morning,
due to an excess of penetration in the weld of a nozzle connection, is not possible to insert the floating part of the level switch inside the vessel. The vessel was hydrotested and certified by third party for PED certification. Can I grind the excess of penetration without compromising the certification of the equipment? I already asked the instrument manufacturer to provide a float with different shape, but they already provided the smaller one they have in their catalog.
due to an excess of penetration in the weld of a nozzle connection, is not possible to insert the floating part of the level switch inside the vessel. The vessel was hydrotested and certified by third party for PED certification. Can I grind the excess of penetration without compromising the certification of the equipment? I already asked the instrument manufacturer to provide a float with different shape, but they already provided the smaller one they have in their catalog.





RE: GRINDING INSIDE PRESSURE VESSEL AFTER Hydrotest
The short response would be to rehydro the vessel after the grinding was performed. If the vessel was subject to additional NDE, then I would expect the vessel would have to be retested exactly the same way it had been tested prior to the "rework or repair."
Best regards - Al
RE: GRINDING INSIDE PRESSURE VESSEL AFTER Hydrotest
thanks for your reply. I also asked a NoBo in charge to release PED certification and I would like to share with you its feedback. First of all is the Manufacturer of the Vessel that shall authorize such activity. Once I will receive the OK to proceed I can grind the excess of penetration, having care just to reduce it and do not go under the thickness of base material. After that a VT and LP inspection shall be carried out. I will report all the above action in a report to be attached into the Vessel documentation and that's it. Grinding is a simple operation which does not change the structure of base metal. Hydrotest after "repair" is not required in this case.
Ciao ;)
RE: GRINDING INSIDE PRESSURE VESSEL AFTER Hydrotest
If this were a vessel constructed to ASME VIII-1, UG-99(a)(1) may have provided you a waive to perform grinding after hydro, without having the need to rehydro;