EN 13445 Non Structural Weld Requirements

[John.I]

Hi all,

I have a query I hope you can help me with.

We will be using some Blanking plates to blank apertures in a tank to enable pneumatic pressure tests. The blanks are manufactured from Aluminium Alloy 5083 H111 / O and have welded handles (also 5083).

Are you able to advise which clauses of 13445 will need to be complied with for welded features (the handles). To note- the purpose of the handles is not to provide structural re-enforcement and therefore only required as manual handling aids. I cant seem to find any clauses in the code for the assessment of welded features such as this (not providing structural reinforcement).

A view from the drawing has been uploaded.

I look forward to your responses

kind Regards
John Ioannou

 

[XL83NL]

Are the handles welded to a pressure retaining component? That wasn’t fully clear to me gro your post.

Huub

 

[John.I]

Hi yes they are welded to the pressure retaining component I uploaded a sketch.

 

[XL83NL]

From which POV do you need to know how the code addresses this? Welding (EN 13445-4 para 7.8 1st sentence), materials requirements (EN 13445-2 para 5), NDE (EN 13445-5 ch. 6)?


Huub

 

[r6155]

John.I
If you have already welded other pressurized parts why ask about this fillet weld?

Regards

 

[John.I]

Hi,

We have been supplied with these components by another supplier but we lack confidence in the design. Does this weld qualify as "pressure bearing" considering it is located on the opposite side of the pressure retaining boundary, however will be subject to stresses once the blank starts to deflect.

 

[XL83NL]

The weld itself isn’t pressure bearing but the weld is connected to a pressure retaining part; therefore the welding requirement are the same as for welding pressure parts.

Huub

 

[John.I]

Ok thank you, so can you please advise whether I need to comply with Annex A or is this negligible due to the fact we are using Aluminium Alloy.

 

[XL83NL]

Annex A of?

Huub

 

[John.I]

13445-3

 

[XL83NL]

Annex A is normative, so needs to be complied with no matter what. However I m not sure how that annex would provide you with your answer. I think your answer is provided in my 2nd post.

Huub

 

[John.I]

Thanks but the clauses you have identified do not include a structural assessment on the weld, are you saying this is not required?

 

[XL83NL]

OK, just trying to be clear; Im getting confused what info you're looking for.
In your first post you mentioned;

Are you able to advise which clauses of 13445 will need to be complied with for welded features (the handles)

I think this question was answered in my 2nd post.
Now the question is

the clauses you have identified do not include a structural assessment on the weld, are you saying this is not required

What do you exactly mean with structural assessment? What information are you looking for exactly? The material requirements for non-pressure bearing parts, welded to pressure bearing parts? How the weld strength is determinedof (i.e. sizing of the weld)?

Huub

 

[BJI]

Are the blanking plates reliant on the handles to meet code strength requirements? If not, then the answer would be no. They could be free to yield and deform provided the flat end is not reliant on them for pressure containment. The only concern would be the localised stiffness caused by the attachment to the pressure boundary, however the localised bending caused by the attachment would be secondary, and given these are temporary items I would think additional deformation would be acceptable.

 

[r6155]

No problem with this weld if made by de fabricator of this PV.

Regards

 

[John.I]

Thank you gents this makes things much clearer. Therefore no structural assessment on the handles / welds as their purpose is not to provide structural reinforcement. That being said we are still welding to the pressure containing component therefore the welds will need to comply with the applicable clauses, is this correct? and if so, what are the applicable clauses for aluminium.

 

[XL83NL]

See my second post for answers.

Huub