Re: [MW:13858] Groove Welds on Corrosion Resistant Weld Overlay

Dear Mr. Prashant,

For welding of internals, you need not consider cladding thickness as cladding thickness is not meant for any structural strength but only for necessary protection. You should consider thickness of the shell and thickness of internals only. Please let us know, the type of activities / job and application you are carrying out.

Thanks & regards,

Deepak Deshmukh

Mob. No. 09422103451

On Sat, Mar 10, 2012 at 1:01 PM, Prashant Shelar <pshelar@lamprell.com> wrote:

Hi All,

My query is as follows:

Shell thickness is 100 mm and material grade is SA 516 Gr.70. There is 6 mm SS316L Weld Overlay on Shell done with ESW process using a qualified WPS. After PWHT of the vessel, there are some SS316L internals are to be welded on the cladding done in the shell. Types of the joints considered on the cladding are Groove & Fillet welds.

Consider the two cases:

a) Suppose the cladding thickness is considered in the design calculations.

The WPS used for supporting the welding of the internals on the cladding after PWHT shall be supported for the combined thickness of shell and cladding & thickness of internals or shall consider only the thickness for cladding & thickness of internals?

b) Suppose the cladding thickness is not considered in the design calculations.

The WPS used for supporting the welding of the internals on the cladding after PWHT shall be supported for the combined thickness of shell and cladding & thickness of internals or shall consider only the thickness for cladding & thickness of internals?

Do we have any ASME interpretations for WPS/PQR of such groove welded joints coming on the cladding portion of the shell?

Thanking you,

Rgds,

Prashant

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