Interpretation UW-13.3 Sketch (c) for Tube sheet with Hub 1

[Safwan Chaklasiya]

thread292-471709

Question

In design of Heat exchanger with hub type Tube sheet as per Fig UW-13.3 sketch (c). Tube-sheet thickness is 150 mm and adjacent shell thickness is 68 mm.
My question is " Is corner radius requirement as per Note(a) - figure UG-34 sketch (b-2), is applicable for sketch(C) of figure UW-13.3. "

My understanding :
-As radius requirement is not explicitly mentioned in sketch (C) of below figure the way it is mentioned for sketch (a) & (b), radius as per sketch (b-2) of fig UG-34 is not applicable.
-In my job, shell thickness is 68 mm and we have provided corner radius of 10 mm.
If UG-34 is applicable then corner radius comes to 19 mm. With 19 mm corner radius tube holes falls on radius profile, which further create problem in tube # tube-sheet welding

Answer

As per ASME Interpretation 20-260 (refer below link), radius need not to be followed as per sketch (b-2) of fig UG-34 for sketch(c) of figure UW-13.3.

https://cstools.asme.org/Interpretation/InterpretationDetail.cfm?TrackingNumber=19845

 

[SnTMan]

Safwan Chaklasiya, good to know. Thx

EDIT: would have been nice had the interp confirmed / denied the minimum radius.

Regards,

Mike

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