Increasing the Design Pressure for Existing U2 Vessel

[Sriniva]

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

 

[Sriniva]

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

 

[A clark]

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.

 

[Sriniva]

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

 

[A clark]

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

 

[Sriniva]

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