Thickness calculation for weldolet

[Srini]

Hi,

How do we calculate the thickness of the weldolet for welding
procedure qualification? Code is B31.3 and ASME SECIX. Weldolet is 8"
SCH40 Bonney forge. So is the thickness (B-C)/2 ie 21mm? Does the
procedure qualification has to support base material thickness of
21mm. The pipe is 8" SCH40. Which section of B31.3 or SEC IX would
address the requirement for this attachment weld between pipe and
weldolet?

Thanks for your help.
Srini

[Bathula Raghuram (Mumbai - PIPING)]

The design of the self reinforced branch connections (or olets) is compensating for the metal removed to make opening from header pipe, where the largest stress concentration would otherwise occur. Hence you must consider the thickness at crotch (hatched cross section in the below fig) for qualifications

 

[manpreet]

Hi

There is no calculation required, What I understood is that u want to prepare a PQR b/w weldolet and pipe, thcikness of weldolet is 21mm.
ist please specify pipe thickness, assuming it to be same as weldolet, Please refer to QW-451 to find thickness limits for Base and weld metal, if impact testing is required:-

Follow QW-403.6 for lower limits and QW-451 for higher limits
if not, follow QW-451 for lower and higher limits.

if weldolet and pipe thicknesses are different, please revert me with quantitative data.

more information would be required to give further explanation.

Regards
Manpreet Singh
Welding Engineer



On Fri, 10 Dec 2010 09:04:52 +0530 Srini wrote

>Hi,
>
>How do we calculate the thickness of the weldolet for welding
>procedure qualification? Code is B31.3 and ASME SECIX. Weldolet is 8"
>SCH40 Bonney forge. So is the thickness (B-C)/2 ie 21mm? Does the
>procedure qualification has to support base material thickness of
>21mm. The pipe is 8" SCH40. Which section of B31.3 or SEC IX would
>address the requirement for this attachment weld between pipe and
>weldolet?
>
>Thanks for your help.
>Srini
>

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>

[Potter, Richard]

The answer is a definite yes. The procedure has to support the thinnest
member of the pressure retaining component.
I was made aware of this during my three year stamp renewal.

-----Original Message-----
From: material...@googlegroups.com
[mailto:material...@googlegroups.com] On Behalf Of Srini
Sent: Thursday, December 09, 2010 1:52 PM
To: Materials & Welding
Subject: [MW:8643] Thickness calculation for weldolet

Hi,

--

[srinivasan sethuraman]

Potter, Thanks. Can you please send me the reference to the code recommending that the procedure has to be made for thinner base material thickness. In my case pipe is 9mm and weldolet is 21mm. Srini --- On Fri, 12/10/10, Potter, Richard <RPo...@itses.com> wrote:

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