Pass partition weld for Plug header type air cooler as per ISO 13705

[sanshu1111]

Not sure if I am reading it correctly as to why a full penetration weld joint preparation is required for the seal weld? In addition, seal weld from both the sides will not be possible if the air cooler is multi pass with more than one pass partition plates on the header or have stiffener plates.

Any advise on the same?

 

[jte]

Sanshu-

Does the presence of the partition plate reduce the thickness of the tubesheet and plugsheet? If the "seal" weld from the tubesheet to partition plate and the partition plate to plugsheet is a load bearing weld, then making it full penetration provides good assurance of the mechanical reliability of these two pressure envelope components. The span of the end plates is less, and they are not perforated. Thus not much incentive to try to take credit for the load capacity of the partition plate in that direction.

 

[Duwe6]

more ISO silliness -- when Sect VIII gets silly, a bunch of us e-mail committee members, ridicule it here, and send in for Code Interpretations. ISO / DIN is not nearly as responsive to reality. Thus oversights/omissions are hard to get removed.

not being offensive to the ISO drafting folks - nobody is perfect, least of all me.

 

[sanshu1111]

Dear JTE/ Duwe6,
Thanks for your response. Yes this requirement is not properly written in ISO/ API and is leading to confusion. I wanted to check if I am missing any thing on this requirement.

JTE,
API 661/ ISO 13705 require full penetration weld for the stay plates and for partition plate if used as stay plates. Requirement for partition plate is however confusing.