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Reinforced Wye

Reinforced Wye

Reinforced Wye

(OP)
All,

I'm a pipeline engineer. very new actually. forgive me if my english is not good, as english is not my first language.

i need your help on designing reinforced wye. initially our client wants us to design a fabricated, reinforced tee with 12" pipe welded to a 24" pipe. I've looked into B31.3 and manage to determine the required thickness for full circumferential pad over the 24" pipe.

Now they want it to be piggable, therefore change it into a 30 degree wye. as per B31.3, minimum requirement is at least 45 degree for a fabricated branch. as far as i've searched,i couldn't find a wye design method/calculation is B31.3 nor in B31.4. I intend to use FEA with Abaqus to design the reinforcement and validate it with BPV Code, Section 3 (if not mistaken), article 4. The pig goes from  the 12" to the 24"

My question is:

1. What is my base, reference, to design any reinforcement and analyze with FEA, because if i follow B31.3, there is method such as pad, saddle or sleeve type? should i follow any of these 3? since my gut feelings says that the welded part will not be that strong since the 12" pipe WT is only 7.6mm after corrosion. therefore i intend to add reinforcement to the 12" branch, instead of just on the 24" line.

2. Can i use calculation n B31.3, but instead of minimum 45 degree, i use 30 degree. will it be acceptable?? (i think it will not, but just asking if possible).

3. is there any other possible method to design fabricated, reinforced wye?

Look forward for your advice.

Thanks.   

RE: Reinforced Wye

Since you are stuck with using FE, consider using a minimal pipe thickness and provide several reinforcement plates perpendicular to the mid-line between run and branch. This is commonly done in, for instance, the wye section at the base of an FCC reactor standpipe.    

RE: Reinforced Wye

I would presume the Wye is in the midline then B31.3 is not applicable at all.

Use BPV for preliminary sizing and validate it with FEA.

The key aspect is to fix the geometry for safe passage of the pig without being stalled or stuck.

Rgds Naren

Narendranath R
Pipeline engineering is made easy with state of the art computer software, visit www.narendranath.itgo.com.

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