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Performs required thickness and maximum allowable working pressure (MAWP) calculations for cylindrical shells with half-pipe jackets attached. The module is based on the ASME Boiler and Pressure Vessel Code, Section VIII, Division 1, 2015 Edition. Specifically, the module is based on the rules in Paragraph EE-1, Appendix EE.
Half-Pipes first performs shell thickness calculations based on both the internal pressure and the externally applied half-pipe jacket pressure. In addition to the thickness calculations, the jacket MAWP is computed for both the input shell thickness and the required shell thickness. After the required thickness of the shell is determined, the half-pipe jacket thickness is calculated. Finally, based on the shell and jacket thicknesses, an appropriate fillet weld size is calculated.
It is important to note the limitations of Half-Pipes. First, the half-pipe jacket analysis performed is only valid for the cylindrical geometries shown in Figure EE-4. These are the only two geometries addressed by paragraph EE-1. The analysis of rectangular or square jacketed geometries is not supported. The second limitation on the Half-Pipes module is the acceptable nominal pipe sizes. Appendix EE only includes charts for nominal pipe sizes 2, 3, and 4. Therefore, nominal pipe sizes greater than 4 or less than 2 will not be accepted in the input. Although there are no charts for nominal pipe sizes 2.5 and 3.5, the Half-Pipes module accepts these sizes and perform iterations between the given charts. Additionally, if the half-pipe is a nonstandard pipe size or has a formed radius, the actual radius is used in the calculations.
Half-Pipes takes full account of corrosion allowance. Actual thickness values and corrosion allowances are entered, and the software adjusts thicknesses and diameters when making calculations for the corroded condition.
