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Increasing the Design Pressure for Existing U2 Vessel

Increasing the Design Pressure for Existing U2 Vessel

Increasing the Design Pressure for Existing U2 Vessel

We are required to relocate an existing Knock Out Drum from one process unit to another process unit.

But, the Operating Pressure and Design Pressure requirements are higher at the new location of the vessel.

We know the vessel has adequate design margin to meet the new Design conditions.

However, the vessel is Stamped U2.

The Original Manufacturer is no longer in business.

Can we use a local R Stamp Contractor to recertify the vessel?

What is the process to be followed?

Please guide us

RE: Increasing the Design Pressure for Existing U2 Vessel

The increase in Design pressure is from 48Barg to 48.6Barg

RE: Increasing the Design Pressure for Existing U2 Vessel

A NB "R" Stamp holder can perform the re-rating.In accordance with the rules in part 3. Just make sure that the certificate holder has experience with re-rating a Div 2 vessel.

RE: Increasing the Design Pressure for Existing U2 Vessel

Dear A Clark - Thank you very much for the advice.

I understand the UDS is to be revised by the end user and certified by PE and AI.

Is this correct understanding? Please reply

RE: Increasing the Design Pressure for Existing U2 Vessel

Yes That is correct. Do you have a copy of the NBIC?

RE: Increasing the Design Pressure for Existing U2 Vessel

Thankyou very much. Yes. We have a copy of the NBIC.

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