wear plate welded to shell subjected to fatigue analysis

[YuJie_PV]

HI, all,
i in behalf of owner is buying a buffer tank, which is subject to cyclic pressure, totally around 500,000 cycles throughout the lifetime.
and many wear plates are requested to welded to the shell to support ladders & platforms, etc.
i have question related to these welds now: is the welds of wear plate susceptible to fatigue failure so much that we need to refuse the request to install platforms? is it necessary to evaluate the welds of the wear plates?

Thanks in advance.

 

[MJCronin]

Consider a repost in the Boiler & PV Forum where detailed questions of cyclic (ASME VIII-Div. 2) loadings are discusssed

MJCronin
Sr. Process Engineer

 

[r6155]

I suggest avoiding wear plates to facilitate in-service inspection.

Regards

 

[YuJie_PV]

MJCronin,OK, i will repost in that place.

 

[TGS4]

I would strongly encourage you to heed r6155's recommendation to avoid wear plates (repads) for equipment in cyclic service. They are inevitably attached with fillet welds, which have very poor cyclic service behaviour. You will likely initiate a crack at either the toe of the fillet weld, or at the root. And as r6155 shared, the presence of the wear plate will make inspection incredibly difficult.

 

[SnTMan]

jay_pv, since you have opened (duplicated) this query in the Boiler & PV forum, please red flag and delete this one.

Thanks in advance

The problem with sloppy work is that the supply FAR EXCEEDS the demand