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

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.

Conical Sections

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, 297, and 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 PD 5500 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, Division 1, Appendix 1 for floating heads under internal or external pressure.

Flanged and Flued Expansion Joints

Stress, cycle life and spring rate in accordance with ASME 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, Division 1, 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 based on ASME Section VIII, Division 1, Appendices 2 and 14.

Half-pipe Jackets on Cylindrical Shells

Required thickness and MAWP based on ASME Section VIII, Division 1, Appendix EE.