in tubesheet design, one should have to consider mean metal temperature of tubesheet. in pv elite, inputs are for mean metal temperature at rim, shell metal temperature at tubesheet & channel metal temperature at tubesheet.
however in TEMA, calculations are only for untubed & tubed portion of tubesheet.
i m a little confused that what should be the inputs for PVELITE as it has a major effect on thickness of tubesheet