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Design Codes and Analysis Capabilities PVElite is a comprehensive solution for a complete, structural design of tall process towers and horizontal vessels.
Design Codes and Standards Implemented
COADE's software keeps pace with the development of vessel design codes and standards by incorporating code changes and releasing product updates as these changes become mandatory. The codes and standards implemented in PVElite include:
- ASME BPV Code Section VIII, Division 1 & 2 - Rules for the Construction of Pressure Vessels
- British Standard PD 5500 - Unfired fusion welded pressure vessels (formerly known as BS 5500)
- ASCE 7 - Minimum Design Loads for Buildings & Other Structures
- International Building Code 2000
- Uniform Building Code
- National Building Code of Canada
- Indian standard (for Wind and Seismic load)
- ASME/ANSI B 16.5 - Pipe Flanges and Flanged Fittings
- Standards of the Tubular Exchanger Manufacturers Association (TEMA)
- ASME B31.3 - Process Piping
The program includes following databases:
- Material properties- Including the Allowable Stress and Yield Stress tables from ASME Sec. VIII, Div1and Div 2, PD5500 and TEMA.
- AISC structural steel database.
- ANSI flange dimension database.
- ANSI pipe schedule database.
- Default Basering dimension database.
- Forged Vessel Connection catalog
Analysis Capabilities:
PVElite has a Component Analysis Module (also known as CodeCalc) and a complete integrated vessel modeling module.
The integrated vessel module of PVElite can perform both new design and re-rate of an existing design. For new Vessel design, PVElite can quickly set required wall thickness for heads, shells and cones, and size components for valid combinations of pressure (internal and external), deadweight (erected, operating and hydrostatic test conditions), and wind and seismic live loads. The program sums the weights of each element and all its details to calculate the compressive stresses in the vessel wall. The live loads bend the vessel, creating both tensile and compressive stresses in the vessel wall. Pressure, too, causes either tensile or compressive longitudinal stresses in the vessel wall. PVElite combines these stresses and adjusts the vessel wall on an element-by-element basis to ensure that this new vessel meets the minimum requirements for both tension and compression.
PVElite is also quick with vessel re-rates. Simply update the corrosion allowance or change the temperature and pressure requirements to have the program re-calculate the vessel's MAWP-- including the MAWP of attached flanges.
PV-Elite's rigging utility shows the bending moments on a vessel during lifting.
A complete vertical vessel analysis will perform the following calculations (a horizontal vessel would contain fewer steps):
Internal pressure for each element: Req. thickness, MAWP, MAPnc, MDMT and hydrotest pressures. External pressure for each element: Req. thk., EMAWP, Max. Stiffened length is computed. Weight of elements & their details: Weight and details acc. to the user specified installation options ANSI B 16.5 flange: Computes Pressure rating based on Class, Grade and design temperature. Vessel Natural Frequency: Computes Natural frequency of the vessel in filled, empty and operating conditions (offers both the analytical and more accurate modal analysis method). Vortex Shedding loads: Computes fatigue stresses and number of hours of safe operation, based on loads generated by wind flutter. Wind and Seismic loads: Based on user selected Wind and Seismic Codes, PVElite computes vessel loads. Wind Deflection: Computes the elemental deflection, angular rotation and critical speed Vessel cross sectional areas and moment of inertia checks: Performs the checks as needed by the code such as for Stiffening Rings and Cone Allowable Stresses: Tensile and Compressive stress allowables are computation for each element. Nozzle check: Program performs all the nozzle checks. Results are given for each individual item and a nozzle summary is provided Vessel Longitudinal stress check: Tensile and Compressive Stresses due to the combined effect of pressure, live loads and weights Vessel support check: For vertical vessels basering or legs and/or lugs are analyzed, for horizontal vessels saddle check are performed Rigging Analysis: Bending and shear stresses, generated in a vessel, while its being lifted, are computed. These stresses are compared to their allowables, graphical results are also provided. Vessel center of gravity Computes the center of gravity of the vessel in new, corroded conditions; and while in field and in shop. For the capabilities of the CodeCalc, PVElite's Component analysis Module, click this link.
