RePad in two pieces

[Josep Maria Perdigo]

In the framework of ASME VIII-1, can I make a RePad in two pieces? (See attached figure)
The welds between the two parts would be butt. There would be a ventilation hole in each part.
Can the longitudinal welds be considered as category A and the circumferential category B as per Fig UW-3?
Thanks for your opinions.

 

[SnTMan]

Josep Maria Perdigo, please read UG-37(h) . I'd say this weld is not categorized.

Regards,

Mike

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

 

[weldstan]

You can do it. It is not Category A or B as per SnTMan. It's been done many many times.

 

[XL83NL]

I concur with weldstan.

 

[rww88]

If ASME Code Section VIII Division 2 were being considered, would the joining weld be categorized "E"?

 

[david339933]

Best location of weld is transverse in your sketch, otherwise you need to RT the welds or possibly increase the area of repad.

 

[GenB]

The repad is suppose to be seamless and you can only equal it by cat A 100% RT. Then attach it transverse, Longverse,reverse in anyway you please.

General Blr. CA,USA

 

[david339933]

GenB,
Not sure what you are stating but:
Repad can be in two pieces....seamless is not required.
Weld in two-piece repad is not categorized.
Attach the two-piece repad with weld transverse to the longitudinal axis of the horizontal vessel, and save the money that would be spent on RT.

 

[jte]

SnTMan already pointed to UG-37(h) which explicitly allows for two piece repads without 100% RT. However, unless A[sub]5[/sub] is decreased, the seam must not be less than 45° off the long axis. The weld seam can be transverse to the long axis (and from a hoop stress perspective this is optimal), but it does not have to be. A very simplistic look at the geometry and thinking about the joint efficiency of a non-RT Category A joint ties together nicely. Although it doesn't apply to repads, Fig. UG-37 at 45° also provides a bit of logic to the ~70-75% joint efficiency which is otherwise given by Div. 1 to the effective strength of a repad.