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Any reference for expansion beyond drum thickness is not acceptable as per ASME Standards/IBR.
This is specifically mentioned in TEMA that expansion length shall be the tubesheet/drum thickness minus 1/8" (3.2 mm) and no expansion of tubes beyond drum/tubesheet thickness is acceptable.
However these standards are being followed for Heat exchangers (Heaters, condensers, coolers & re-boilers) only and our boiler is designed as per ASME Sec-1 and IBR.
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