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Flued Opening Area Replacement

Flued Opening Area Replacement

Flued Opening Area Replacement

(OP)
I am attempting to perform area replacement calculations for a flued opening under Section VIII div 1. I am not sure how to handle the required thickness in the curvature in the nozzle in order to thicken the nozzle and head correctly. Any assistance would be helpful.

RE: Flued Opening Area Replacement

Refer to UG-38 in ASME VIII-1.
Cheers,
gr2vessels

RE: Flued Opening Area Replacement

Jlevy,

You have to forsee how much flanged in/out portion be thin, the thickness of the flanged in/out portion shall not be less than that required by UG-27 and/or UG-28.
There are some requirements for the minimum depth of the flanged in openings, you will note in UG-38(b).
Now you have to satisfy UG-37. UG-45 needs not be satisfied.
 

Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN

RE: Flued Opening Area Replacement

Jlevy,

In continution to my above email, in 2001 UG-36(c)(3)(a) was revised to also include the flued (i-e flanged) openings.
You need not to perform UG-37 calculations if flued openings are exempt by UG-36(c)(3)(a).


  

Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN

RE: Flued Opening Area Replacement

(OP)
I had read through the UG-38 requirements, this application meets UG-38 (b). The problem I am having is how to actually complete the UG-37 [UG-38(a)] reinforcements calculations. In UG-37.1 the figure (and supporting equations) show all rectangular areas, but in my case the entrance into the vessel is curved. In general I can understand what is required for the replacement of area, but the Trn for the nozzle will increase along the curve of the nozzle (if that statement makes sense) and I am not sure how to account for this.

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