Materials & Welding: [MW:33913] Re: 33905] Min Weld throat thickness for Nippolet

Tuesday, January 10, 2023

[MW:33913] Re: 33905] Min Weld throat thickness for Nippolet

Hi Pradeep,

As per ASME B31.3 (2020) Figure 328.5.4F and para Figure 328.5.4 (c ) the minimum branch weld thickness Tm shall be as below

As specified by the manufacturer of the branch connection fitting.
The full depth of the resultant weld groove, after fit-up, if no manufacturer's weld thickness is specified.
As documented and specified in the engineering design in accordance with para. 300(c)(3)
Calculated and documented in accordance with the requirements of para. 304.7.2

Based on above cases, this needs to be confirmed by vendor,

But is there any other solution ?

I was planning to do the re-inforcement calculation as per ASME B31.3. But I doubt this is applicable in case of selfreinforced fitting.

On Monday, January 9, 2023 at 6:59:49 PM UTC+3 P Goswami wrote:

Hi,

Ideally the weld configuration should look as what's earmarked in the attachment. You may need to check the requirements of piping design code(presume B31.3) also. Use of such reinforced design, similar weldolets would always involve larger welding volume, which may be detrimental to an 1", sch 10 pipe.

Why such configuration is needed?

Alternative (better) design would be to change the design to Sweep lets.

This my opinion from the aspects of better welding design. For SDSS, good welding design is essential.

Thanks

Pradip Goswami.P.Eng, IWE.

Independent Welding & Metallurgical Engineering Specialist

Saudi Aramco Approved Designated Project Welding Engineer (DPWR)

Qatar Petroleum Approved, SME-Materials & Corrosion Engineering.

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgos...@rogers.com,pradip....@gmail.com

Cell/Whasapp:1-905-9793232

From: material...@googlegroups.com <material...@googlegroups.com> On Behalf Of NDD
Sent: January 9, 2023 12:30 AM
To: Materials & Welding <material...@googlegroups.com>
Subject: [MW:33905] Min Weld throat thickness for Nippolet

Hi,

In ongoing project one of our fabricator proposed below

" Welding of 6''x3.4mm SDSS Run Pipe to 6X1''NB Sch 10S Reinforced Nippoflange, filling of full pre beveled groove will lead to run pipe deformation, contractor propose to fill the weld metal with main pipe wall thick plus 1/3, so the weld throat will be 6mm to 8mm instead of filling the full pre groove."

My query is how can we govern the min weld thickness requirement?.

Or any other way to ensure integrity.

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