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- since 1996 -
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Technical Discussions
Melih
Melih
14:36 Mar-23-2018
Inspection of Nozzle Welds

Hello Everyone,
I am working at technical control department in refinery.We realized that there was some leakage on nozzle welds of exchanger.So,We want to find the proper technique and device for inspecting nozzle welds.But devices that will be used must be small or portable.Because there are some obstacles around the nozzles.
Thanks for your informations and helps from starting...

 
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Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 786

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
786
13:56 Mar-24-2018
Re: Inspection of Nozzle Welds
In Reply to Melih at 14:36 Mar-23-2018 (Opening).

If the nozzle is leaking, perform PT and plan repair

 
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Laurent
Consultant,
France, Joined Mar 2016, 16

Laurent

Consultant,
France,
Joined Mar 2016
16
11:07 Mar-27-2018
Re: Inspection of Nozzle Welds
In Reply to Melih at 14:36 Mar-23-2018 (Opening).

Hi Melih,
Can you give us more information?
Material, thickness, reinforcing pad, diameter of nozzle?

 
 Reply 
 
Melih
Melih
16:03 Mar-27-2018
Re: Inspection of Nozzle Welds
In Reply to Laurent at 11:07 Mar-27-2018 .

There are many nozzles to inspect.But many of them are carbon steel and 2" and 3".Also there is no reinforcing pad.

 
 Reply 
 
Laurent
Consultant,
France, Joined Mar 2016, 16

Laurent

Consultant,
France,
Joined Mar 2016
16
14:51 Mar-28-2018
Re: Inspection of Nozzle Welds
In Reply to Melih at 16:03 Mar-27-2018 .

I would suggest to perform to do air leak test (low pressure; <1 bar !!) with soap. PT can be helpful by increasing time of penetration.
I guess you're informed but if you have to repair by welding you shall re qualify your pressure vessel (NDT, hydrotest) with support of your national third part.

 
 Reply 
 
melih
melih
20:04 Mar-28-2018
Re: Inspection of Nozzle Welds
In Reply to Laurent at 14:51 Mar-28-2018 .

Thank you all.These are good suggestions but i am looking for the fast way of inspection nozel.Because there are many nozzles to inspect.

 
 Reply 
 
Mario Talarico
NDT Inspector,
Italy, Joined May 2010, 423

Mario Talarico

NDT Inspector,
Italy,
Joined May 2010
423
13:20 Mar-29-2018
Re: Inspection of Nozzle Welds
In Reply to melih at 20:04 Mar-28-2018 .

Melih,
for nozzles with 2 and 3 inch diameter, you can have feasibility limits depending on the configuration and access available. Just to be practical, we will work on set-on and set-in nozzles attached to components that are accessible from internal side (shell type ) or not accessible from internal side (header type).

A set-in nozzle is regularly scanned without problems from the shell or header, with some precautions for small diameters header. In your case, considering the indicated nozzle diameter, there is no degree scanning from the inside diameter nozzles: consequent reduction of the quality level control. Add possible limitations to the root analysis with 'as weld' surface, due to access from one side only.

Set-on case: angle beam scanning nozzle side has heavy losses on the rebond signal from the inner diameter, due to the strong curvature. The reference-blocks of the type recently adopted by Asme ( Asme V- Fig. T-434.3-2) will give you an effective idea of the loss of dB, how many tangential SDH reflectors you can insert and which length (due to the curvature and thickness of reference-block ). Considered that the holes can not bend ……perhaps a notche is preferable instead of the SDH. This is also legal in some rules. If the component on which the nozzle is inserted can be accessed from inside, you can compensate with the zero degree scanning not-beveld side (very powerful) and shear wave scan not-beveld side, a bit difficult to conduct. Here too limitations due to one-sided scanning and for "as weld" surfaces are to be considered.
Often some particular tapering on nozzles can become an advantage rather than a limit (there is some post about it).

The signal losses on the curvature of the inside diameter of the nozzle can reduce with some beam focusing mechanism, but this is definitely another chapter.

Greetings-
mario

 
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