repair of scratch on sealing surface of proprietary flanged assembly 1

[tigny]

Hi,

after UG-99 hydrostatic leak testing [and supplemental gas leak testing (sniffer)], a pressure vessel has the first sealing surface of the connections used for pressure test exposed during dismantling.

There are scratches on such faces happening at this moment.

After repair of those faces (remachining (turning) of the sealing face, less than 1 mm thick metal removal; thickness for pressure requirement is still OK), is a hydrostatic leak testing mandatory? Is a gas leak testing sufficient?

I cannot find specifics in the ASME BVPC.VIII.1 on this matter.

best regards

Cyril

 

[TGS4]

If the vessel has passed the pressure test (you did mention UG-99), then this is now an in-service vessel. This damage is considered in-service damage. ASME Section VIII, Division 1 will have nothing to say, since its jurisdiction is complete when the vessel passes the pressure test. Follow the appropriate in-service repair standard, appropriate for your jurisdiction.

 

[tigny]

If the vessel has passed the pressure test (you did mention UG-99), then this is now an in-service vessel. This damage is considered in-service damage. ASME Section VIII, Division 1 will have nothing to say, since its jurisdiction is complete when the vessel passes the pressure test. Follow the appropriate in-service repair standard, appropriate for your jurisdiction.

Dear TGS4,
This makes sense, thank you for clarifying this matter.
Best regards,
Cyril