Rectangular Vessels - PV Elite - Help - Hexagon

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Specifies parameters and performs stress calculations and maximum allowable working pressure calculations for the rectangular, obround, and circular vessels described in the ASME Boiler and Pressure Vessel Code, Section VIII, Division 1, 2015, Appendix 13. The software analyzes the following vessels:

  • Fig. 13-2 (a)(1) - Vessel with equal long-side and short-side thickness.

  • Fig. 13-2 (a)(2) - Vessel with differing long-side thickness.

    Fig 13-2 (a)(2)

  • Fig. 13-2 (a)(3) - Vessel with rounded corners.

    Fig 13-2 (a)(3)

  • Fig. 13-2 (a)(4) - Reinforced vessel.

  • Fig. 13-2 (a)(5) - Non-continuous reinforced vessel with rounded corners.

  • Fig. 13-2 (a)(6) - Non-continuous reinforced vessel with rounded corners.

  • Fig. 13-2 (a)(7) - Rectangular vessel with single stay plate/row of bars.

  • Fig. 13-2 (a)(8) - Rectangular vessel with two stay plates/rows of bars.

  • Fig. 13-2 (b)(1) - Obround vessel.

  • Fig. 13-2 (b)(2) - Reinforced obround vessel.

  • Fig. 13-2 (b)(3) - Obround vessel with single stay plate/row of bars.

  • Fig. 13-2 (c)(1) - Circular vessel with single diametral plate.

Analysis

The software first performs ligament efficiency calculations for those vessels with holes in the side plates. The membrane and bending ligament efficiencies are used to adjust the stress calculations at the mid-side of the plates. The ligament efficiency calculations are based on section 13-6 and are performed for both uniform and multi diameter hole patterns.

After the ligament efficiencies are determined, the software performs the individual stress calculations. Membrane, bending, and total stress calculations are performed as prescribed by the code in Sections 13-7 through 13-13. These stresses are compared to their allowables, and a highest percentage of allowable calculation is performed.

The final calculation performed is the maximum allowable working pressure (MAWP). The software computes an MAWP for all three types of stresses (Membrane, Bending, and Total). Additionally, depending on the specific geometry of those vessels stayed by bars, an additional MAWP is computed according to Equation 2 of UG-47.

The software takes full account of the corrosion allowance and uses the corroded condition for all dimensions in its calculations. The only exception is the reinforcement calculations. The reinforcing member is assumed to be entered in its corroded state.