Although not shown in the attached drawing , as per your email the groove depth for the lifting lug is 40 mm. This exceeds the PWHT requirement of UCS-56. The lug is not welded directly to the shell (the pressure boundary component), but to the lug plate.
Lifting lug is a load bearing component, carrying the entire vessels loads. Hence any failure of the Lug to Lug plate welding could be a serious safety issue.
Keeping this logic in mind, lifting lugs are always welded and PWHT-ed with the vessels.
It's not clear from the attached drawing if this PWHT requirement of the Lug Weld was correctly conveyed.
I would say keeping the above rationale in mind this weld would require PWHT.
Thanks.
P.Goswami.P.Eng, IWE.
Welding & Metallurgical Specialist
Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/
Email:pgoswami@quickclic.net,pradip.goswami@gmail.com
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Muhammed Ibrahim PK
Sent: November 16, 2017 5:29 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:26994] PWHT of lifting lug
Dear Mr. John Henning,
The query I raised is not about buttering. Here the issue is the groove depth ie the thickness of the lifting lug is 40 mm and it is a full penetration groove which is welded on lifting lug pad plate. So PWHT for this groove is applicable or not as per UCS-56 Table General note 1.
Thanks & Regards
Muhammed Ibrahim PK
On 16 November 2017 at 18:14, John Henning <jhenning@deltak.com> wrote:
Mohammed,
What you have described is buttering of the pressure vessel to eliminate PWHT. The weld butter is not pressure retaining and is not counted in you Code Calcs as such. Therefore it is permissible to make the weld pad, PWHT, then weld the lifting lug to the butter pad. See QW-283 "Welds with Buttering" for qualification requirements. Not particularly arduous. This type of weld is done frequently, especially when welding ferritic materials to stainless steel. When I worked for a major steam turbine company, this was done frequently on pressure vessels to allow for welding in the field etc. without having to PWHT.
The Code paragraph you cited was for pressure retaining welds (principally long and circumferential seams in drums).
Enjoy – John
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Rajagopal Kannan
Sent: Thursday, November 16, 2017 3:55 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:26991] PWHT of lifting lug
Hi Mohammed,
1. See the WPS you have used to weld the lifting lug. If it calls for PWHT, Please perform the same.
2. The code is saying all welds in the Pressure vessel or Pressure vessel part ( i.e) all welds includes pressure part/ no n pressure part / preesure pert to Nonpressure part.
However, If the weld doesn't fall under UCS 56 requirements, you need not do PWHT , if WPS doesn't calls for it.
3. The pressure vessel parts mentioned there refers to part of the vessel only being manufactured by you ( e.g) Dishes/ Quick Opening closure etc.
Thanks and Best Regards,
K.Rajagopal
On Thu, Nov 16, 2017 at 12:56 PM, Muhammed Ibrahim PK <ibratech@gmail.com> wrote:
Dear Mr. Prem,
Lifting lug pad is pressure part as per ASME Sec VIII ?. The groove of lifting lug will consider as pressure part ?. UCS 56 says pressure vessel and pressure vessel part shall be subject to PWHT. Still confusing.
Thanks & Regards
Muhammed Ibrahim PK
On 15 November 2017 at 21:26, PREM SHANKARDUTT NAUTIYAL <prem_nautiyal@rediffmail.com> wrote:
The nominal / governing thickness is more than 38mm i.e 40mm FPW.
As per UCS 56, PWHT will be required for the 40mm thick lifting lug weld joint.
You should have welded the lifting lug earlier and sent the equipment for PWHT !!
PREM S NAUTIYAL
CELL : 9769316004
From: Muhammed Ibrahim PK <ibratech@gmail.com>
Sent: Wed, 15 Nov 2017 21:28:10
To: materials-welding@googlegroups.com
Subject: [MW:26985] PWHT of lifting lug
Gents,
I need to clarify one issue with PWHT of a lifting lug.
An ASME Sec VIII Div I vessel require PWHT. lifting lug pad welded with vessel and PWHT done. After PWHT a lifting lug will weld with the pad. The lifting lug having thickness of 40mm and having full penetration groove weld with pad. Is this lifting lug to pad welding required PWHT ?. Please find attached drawing detail for reference.
Your valuable advice will be appreciated.
Thanks & Regards
Muhammed Ibrahim PK
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