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Pressure Vessel Analysis

Intergraph® PV Elite®


Intergraph PV Elite is a complete solution for vessel and heat exchanger design, analysis and evaluation. Users of PV Elite have designed equipment for the most extreme uses and have done so quickly, accurately and profitably.

Read about NozzlePRO product features here.

Data Collection
PV Elite makes defining pressure boundary conditions for vessels and exchangers easy, even for load sets that require significant data input. PV Elite streamlines data entry by breaking the input down into sensible subsets. Help on any input item is only a keystroke away. 

PV Elite's graphical representation of analysis models helps ensure confidence in the input and results. With PV Elite, analysis models can be viewed and manipulated with complete ease.

Analysis Options
PV Elite performs calculations in accordance with ASME Section VIII, Divisions 1 & 2, PD 5500, and EN 13445. Rules from API 579 (Fitness for Service) are also included for evaluating the current state and remaining life of existing vessels.

Outputs and Reports
To simplify inspection requirements, PV Elite lists the most important equations such as required thickness and maximum allowable working pressure (MAWP) and also groups results by type (e.g. internal pressure, external pressure, bending stress, nozzles and flanges). Overall results are summarized where the element or detail controlling the overall vessel MAWP is identified. 

Materials and Codes
PV Elite is a global package with international code rules plus extensive region-specific content. Vessel material definitions, piping and steel component data, local wind loads and local seismic loads of many regional markets are all included.

PV Elite interfaces with other popular software packages for finite element analysis, foundation design and drafting. PV Elite also shares a bi-directional link to Intergraph CADWorx® Equipment module.

Component Design & Evaluation
PV Elite includes CodeCalc for quick and efficient component design and evaluation. For more details on CodeCalc visit: http://www.coade.com/products/codecalc

Intergraph PV Elite 2016 Release

Intergraph® CodeCalc®

Note: Sale of CodeCalc, as a stand-alone product, ended on December 31st, 2009

Intergraph CodeCalc allows you to easily analyze individual components without having to create a complete vessel model. Quick checks of individual vessel components address the following:

Shells and Heads

MAWP or the required thickness for a specified internal or external working pressure, Appendix 9 for jackets and vessels, and the API 579 capability for calculating vessels that have an identified flaw.


MAWP, the thickness required for specified internal or external working pressures and the discontinuity stresses at cone-to-cylinder junctures.

Area of replacement, minimum design metal temperature, minimum neck thickness, weld strength, minimum weld size, large nozzle and hillside calculations.


Required thickness, MAWP and code-defined stresses using ASME Section VIII - Appendices 2 and Y for stress and rigidity calculations.

Nozzle Loads

Local stresses due to external loads according to WRC Bulletins 107, 297and 368 as well as PD 5500 Annex G. Allowable stresses are also computed.

Base Rings

Required thickness of the gusset, 
skirt and annular baseplates due to wind or seismic
moments and the local stress and required thickness of the top plate.


Stresses at key points on the vessel and saddles for various conditions, including wind and seismic loads, using Zick Analysis.

Vessel Attachments
Stresses on legs, supporting lugs, trunnions and lifting lugs taking into account their allowable limits

and stresses on cap type and continuous top support rings (girder rings).

Tubesheet and Flanged Extension
Required thickness using TEMA, ASME or the PD5500 method and allowable tube stresses, tube-to-tubesheet joint loads and allowable loads.

Floating Heads

Required head thickness and resulting flange bending moments per ASME Section VIII, Division1, Appendix 1 for floating heads under internal or external pressure.

Flanged and Flued Expansion Joints
Stress, cycle life and spring rate in accordance withASME Section VIII, Division 1 and TEMA Standards.

Metal Bellows Expansion Joints
Stress and cycle life for both reinforced and non-reinforced bellows per ASME Section VIII, Division1, Appendix 26.

Fabricated Piping Intersections
Required thickness due to internal pressure, required and available area of reinforcement and MAWP according to ANSI B31.3.

Rectangular and Non-circular Vessels

MAWP and stress, including stayed 
or reinforced geometry, per ASME Section VIII,
Division 1, Appendix 13.

Large Openings in Integral 

Flat Heads Stresses and allowable stresses basedon ASME Section VIII, Division 1, Appendices 2 and 14.

Half-pipe Jackets on Cylindrical Shells
Required thickness and MAWP based on ASMESection VIII, Division 1, Appendix EE.

Paulin Research Group NozzlePRO™ for Intergraph® PV Elite® and CAESAR II® 

NozzlePRO is a standalone solution that enables users to quickly and easily perform Finite Element Analysis (FEA) of individual pressure vessel and piping components. Engineers can perform FEA without the need for extensive knowledge of FEA modeling or analysis techniques.

NozzlePRO from Paulin Research Group is available for purchase from Intergraph.

Read the product sheet here.

Integrate FEA with CAESAR II and PV Elite
Since NozzlePRO enables FEA results to be seamlessly incorporated within traditional code-based analysis, projects can benefit from the accuracy of FEA and the practicality of code-based analysis. For example, the flexibilities and SIFs analysis results can be easily combined with Intergraph’s CAESAR II or PV Elite to improve the overall analysis of piping systems or vessels so they are neither over- nor under-designed.

Extend Beyond Code-Based Analysis
NozzlePRO can analyze components that fall outside code limits. It can also calculate more accurate maximum allowable loads and stresses. Therefore, it is able to accurately establish consistent safety factors for analysis. These more accurate results lead to improved efficiencies in design and help increase the life span of piping systems and associated equipment. 

Quickly Build Accurate Analysis Models
Component input is quick and straightforward while also allowing customization of the mesh and boundary conditions. For even more accurate evaluation of loads and displacements on the nozzle and in the piping system, users can pipe away from a piping junction on a vessel head or cylinder to evaluate the effect of the thermal expansion on a nozzle. Straight sections, elbows, bends, intersections, and linear restraints may all be included in the nozzle analysis.

Results and Analysis Based on Research
Realistic flexibilities in a nozzle typically result in much lower stresses (higher allowable loads) on nozzles. The original design code SIF values for intersections were derived from work performed in the 1940s by A.R.C. Markl. Most of these experiments were performed on a single-size piping run. All other SIF values were extrapolated from this piping run.

The SIF values in NozzlePRO are based on the testing done by Markl plus many real-world and finite element calculations performed since those original tests. This means NozzlePRO provides the most comprehensive evaluation of SIFs and K-factors for nozzle connections to date.

Industry-specific FEA Analysis
A distinguishing feature of NozzlePRO compared to general purpose FEA solutions is that it performs automated code compliance reports for ASME Section VIII – Division 2 stress categories. This saves you time because there is no need to perform additional post-processing or compliance checks.