Manufacturing of "Integral Double Tubesheets" for a Lethal Service BEM Heat Exchanger.

[Narin]

Good morning All;

I need some information for manufacturing of "Integral Double Tubesheets" for a Lethal Service BEM Heat Exchanger.
As I know,because of requirements for Lethal Service, Full RT, all figure UW-13.2 as corner welds are prohibited.

Thank you,

 

[SnTMan]

narges-p, you are under a misconception. Corner joints are not prohibited in lethal service.

Regards,

Mike

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

 

[Narin]

Hi Mike;

As I know,all corner joints are prohibited because of Full RT Requirement for Lethal service.
It is impossible to do Full RT for corer joints.

Thank you,

 

[SnTMan]

narges-p, my mistake, I extend my apologies. These are presumably Cat C joints and must indeed be butt-welded. You would therefore need to provide hubbed tubesheets. A combination of RT and UT [UW-51(a)(4)] and careful sequencing of fabrication could presumably be used to satisfy the full RT requirement.

Regards,

Mike





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

 

[Narin]

Hi Mike,

Thank you for your reply so we should do fabrication of tubesheets based on Figure UW-13.3 of ASME sec. VIII.

Sorry, do you have any information regarding the design of Double Tubesheets for BEM shell and tube heat exchanger.

Regards,
Narges,

 

[SnTMan]

Narin, yes, hub per the Figure. Possibly both sides of both inner & outer tubesheets, depending on the service. However it seems to me that if both shell & tube sides were in the same lethal service there would be no need for double tubesheets. Also See UW-2(a)(3) & (4).

TEMA has rules applicable to double tubesheet design you may find helpful.

Regards,

Mike

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