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Re: [MW:28122] CRITERIA OF CLAD THICKNESS

By Materials & Welding
Dear Ali:

The clad material (625 Inconel) has specific acceptable ranges for each element.
You have to conduct chemical analysis on different depths; first the root pass surface; second on the depth corresponding to the surface of pipe (grind the root flush to the internal surface of the pipe); the third point shall be 3 mm below the surface (if you have 3mm of Inconel cladding) and at this point, the concentration of all elements shall be at the Inconel 625 specified range (this is the most important measurement). If they fail to meet chemical analysis requirements then you have to modify your welding procedure.

Ramin  Kondori
Sr. QA/QC & Welding Engineer
-----------------------------------------------------------
PG-Dip. in Welding Engineering (IWE  AT  0070)
BSc. in Civil Engineering (IUT)
BGAS Painting Inspector
ASNT Level I&II
                        
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On Mon, Jul 23, 2018 at 6:54 PM Ali Asghari <asgharialigl@gmail.com> wrote:
Dear All.

Does anybody know about how a designer calculate the thickness of clad material especially for sour service and how much is conservative?
because in our project documents have not said clearly that thickness of clad have to be measured from base material or from layer that dilution is negligible and this question remained does designer account or consider dilution or not?

Regards.

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