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WELDED STAYS ON FIRED-PRESSURE VESSELS

WELDED STAYS ON FIRED-PRESSURE VESSELS

WELDED STAYS ON FIRED-PRESSURE VESSELS

(OP)
Hi,

I am currently working on fired-pressure vessels. We are currently having trouble in welding stays in the tube sheet of the vessel specially during welding. The main problem that we are having are the lack of penetration of the welding. Some of our associates suggested that we can do a partial penetration on the the stays as illustrated in ASME 2011a Sec. VIII Div. 2 - Alternative rules Part 4.9.4, Fig. 4.9.1 (d). But there is a note at the bottom indicating that the "ts is the nominal thickness of the thinner stayed plate."

Does this mean that if I have a uniform thickness tube-sheet, despite having computed for the allowable shear stress of the material and welding to get the thickness of the welding, the welding thickness required for the stays will still be equal to the thickness of the tube sheet?

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