thickness of WELDOLETS

[Ali Asghari]

Dear All
According to ASME B31.3 fig328.5.4.D( SKETCH1) the thickness of weld deposit is calculated acc to 331.1.3.
Now in weldolet fittings that have unequal thicknesses in both of ends. T_b is equal to thicker or thinner thickness?why?
we need to know for calculating of governing thickness for PWHT.
regards.

[Bathula Raghuram (Mumbai - PIPING)]

You have to consider the weld where maximum is deposited (331.1.3.states “when the thickness through the weld in any plane through the branch is greater than twice the minimum material thickness requiring heat treatment …………….” )

[john]

Ali,

Post Weld heat treatment is governed by thickness of base pipe / Run
Pipe and as per table 331.1.1 of ASME B 31.3.

In most of the cases Run Pipe thickness is greater than or Equal to
Branch Pipe.


If you’re run pipe falls under PWHT category than u have to do the
PWHT for that joint.

Hope Every body agrees with me.


Regards

[manpreet]

Dear Ali,

I really couldn't understand what you are asking for, but would like to detail some of the information about weldolet connection.

Weldolet might be rquired for connecting main pipe to branch (let's say dissimilar OD/thickness), now qustion arises whether weld bevel shall be completely filled out, though B31.3 calculation might not require full volume of weld, good practice is to completely fillup the weld bevel to weld line on the O-lets. Smooth transition between the pipe and the O-lets is required. Notches below the weld line shall be avoided.

Please descibe your query with quantitative information.

Regards
Manpreet Singh



On Tue, 08 Feb 2011 21:39:06 , Ali Asghari <asgha...@rocketmail.com> wrote

Dear All
According to ASME B31.3 fig328.5.4.D( SKETCH1) the thickness of weld deposit is calculated acc to 331.1.3.
Now in weldolet fittings that have unequal thicknesses in both of ends. T_b is equal to thicker or thinner thickness?why?
we need to know for calculating of governing thickness for PWHT.
regards.

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[manish kulkarni]

Dear   The major problem with weldolets ia in procurement stage. The weld groove details, thk. are governed based on pressure rating of system.Many times high thk. weldolets are ordered even if not required as per design.MSS SP documents gives guidelines for weldolet dimensions and most of weldolet manufacturers pprepares weldlets with those details.   Correct way is to check required weld thk. at neck for proper weld thk. required.   Regards,   Manish Kulkarni  --- On Wed, 9/2/11, manpreet <manpre...@rediffmail.com> wrote:

[vvp....@gmail.com]

Hi,

I have  a WPS for 6Mo with BM range 12.04 mm wall thickness max. Now i have a situation to weld a 2" weldolet on a 6" run pipe. Now weldolet groove thickness is measured to be 13.9 mm on the hub side. However the theoretical thickness is 11.905 mm. Can I weld this using the same WPS??

[james gerald]

Please check if the attached is useful in calculating the weld thickness.

Thanks & Regards

J.Gerald Jayakumar

0091-8838619635

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