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Dimensions of Dished Ends for Pressure Vessels like Boiler, Reactor, Storage Tank

According to IS 4049 (Part-2): 1996 and Table 2 Dimensions for Dished and Flanged Ends (Torispherical) Inside Crown Radius is 80% of ID Inside knuckles Radius is 10% of ID and in no case less than 6% nor less than 3 x thickness of Dish.   Inside height of Dish can be calculated according to IS: 2825 – 1969 and IS 4049 (Part-2) : 1996 as follows: Now the Inside height can be calculated according to IS: 4179 – 1997 which is as follows:  When Knuckle Radius is 10% of ID           2. When Knuckle Radius is 6% of ID           Where h i = Inside height of Dish                       R i = Crown Radius of Dish                       r i = Knuckle radius of Dish                       D i = Inside diameter of Dish                         S f = Straight Flange length of Dish   Minimum length of straight flange shall be 3 x thickness of Dish or 20 mm but not exceed 38 mm except when necessary to provide required length of taper.  

How to calculate Design Temperature, when Working Temperature is given for Pressure Vessels like Boiler, Autoclave, Reactor, etc?

The temperature used in design shall not be less than the mean metal temperature through the  thickness. For vessel where direct internal heating is employed, or severe Exothermic reactions take place, the design temperature shall be +25 O C or more than the maximum temperature expected.