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Shell thickness calculation (residual wall thickness for thermowell)

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mangyu

Mechanical
May 14, 2015
1
The thermowell depth in the HP drum is up to 3 mm from the drum inner wall.
Incidentally, we would like to verify the safety of inner thermowell residual wall thickness(3 mm) during the hydro test.
The ASME. PG-27.2.2. is used for the thickness calculation and the require minimum thickness is 1.89 mm considering the opening size(24 mm), design pressure(174 barg) and design temp(355 ℃).
Please confirm the calculation method is correct and if you have any comment please let us know.

thermowell_uqnzht.jpg
 
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