Pressure Vessel Design per European Standard DIN EN 13445

The EN 13445-3 and EN 1591-1 programs cover the calculation rules and proofs demanded by the according chapter of the code. Additional information and hints for pursuing calculations or deficiencies in the code can be displayed dynamically by using the InfoBrowser.



The material data base of the program comprises the physical and mechanical properties of more than 3.400 materials. It includes all required DIN-EN delivery standards for the AD 2000 Merkblaetter and the TRD as well as all ASME specifications.

Bidirectional interfaces to CAD systems are available on request.

Overview of programs per EN 13445-3

Basic package EN 13445 - similar to AD 2000 section B

PDEN module Try Buy

Test pressure and material characteristics according to EN 13445-5 / chapter

For a single-compartment vessel subjected to internal pressure, working below the creep range, the test pressure, applied as internal pressure at the highest point of the chamber of the vessel for either horizontal or vertical test positions, is defined in the standard EN 13445. The modifications of the test pressure due to the hydrostatic pressure is also specified in the regulation.

The PDEN modules calculates the test pressure at the highest point for a complete project and provides the material characteristics of the used materials.

EN 07 module Try Buy EN 08 module Try Buy

Shells under internal pressure per EN 13445-3 chapter 7

Shells under external pressure per EN 13445-3 chapter 8

EN 09 module Try Buy EN 10 module Try Buy

Nozzles with or without reinforcement plate and openings in cylindrical, conical and spherical shells per EN 13445-3 chapter 9

Design of circular, elliptical or obround openings in dished ends or cylindrical, spherical and conical shells. the program provides a special calculation feature for nozzles at the knuckle area. 

Flat ends per EN13445-3 chapter 10

Calculations for determining the thickness of circular and non-circular unstayed flat ends under pressure and for providing adequate reinforcement for openings fitted in such ends.

Plates with or without edge moment can be designed.

EN 13 module package Try Buy

Heat exchanger tubesheets per EN 13445-3 chapter 13

The EN 13 module package consists of 3 modules for U-tube tubesheet, fixed tubesheet and floating tubesheet heat exchangers according chapter 13 of EN 13445-3. It is similar to AD 2000 B5 and the UHX module package of ASME VIII.

  • EN13.04 module deals with U-tubesheets
  • EN13.05 module deals with fixed tubesheets
  • EN13.06 module deals with floating tubesheets

1591 module package Try Buy Material database WERK Try Buy
Alternative method for the design of flanges and flanged connections per EN 13445-3 Annex G

Integration of several flange and gasket codes

The package includes modules for ASME/ANSI flanges B16.5 (AFLT), EN 1092 (1092), DIN 28034 (VFLN), DIN 28036 (SFLA) and 2 gasket modules according DIN 269x + DIN EN 1514 (1514N incl. manufacturer data)

Selection and documentation of materials for pressure vessel design

The program determines the allowable material properties dependent on temperature, workpiece geometry, regulation standard and delivery standard. Own values can be added to a custom material table.

All values are displayed on screen and may be printed, copied into the clipboard, saved as a file (e.g. for further processing in Microsoft WORD) or transferred to any of our calculation modules e.g. AD 2000 / EN / ASME / TRD calculation program.

The material server is bilingual. You can switch from German to English and vice versa.

Vessel support stability package - similar to AD 2000 section S3.1 to S3.4

EN 16.07 module Try Buy EN 16.08 module Try Buy
Local loads due to lifting lugs at cylindrical shells and domed heads per EN 13445-3 chapter 16.7


The EN 16.07 module calculates longitudinal or tangential lifting lugs with or without reinforcing plate. The strength proof of the weld and of the lug is performed according to RKF BR A 62.

Horizontal vessels on saddles per EN 13445-3 chapter 16.8

Module EN16.8 can be used for the design of horizontal vessels without reinforcement rings on multiple saddle supports acc. DIN EN 13445-3 section 16.8. The program performs the proof of the load limit between the saddle support as well as at the saddle support according chapters 16.8.6 to 16.8.8.

A proof of the saddle support may be performed according AD 2000 S3/2 section 6.

EN 16.09 module Try Buy EN 16.10 module Try Buy
Horizontal vessels on ring supports per EN 13445-3 chapter 16.9

Design of horizontal cylindrical shells with stiffening rings, welded to the inside or outside of the shell. The rings are supported by saddles or legs or otherwise.


Vertical vessels on bracket supports per EN 13445-3 chapter 16.10
  • brackets with / without reinforcing plate
  • additional loads (e.g. wind, earthquake, etc.)
EN 16.11 module Try Buy EN 16.12 module Try Buy
Vertical vessels with dished heads on legs per EN 13445-3 chapter 16.11

similar to AD 2000 S3.3

Vertical vessels with skirts per EN 13445-3 chapter 16.12
  • cylindrical or conical skirts
  • connection with supporting ring or welded
  • determination of required section loads
EN 16.14 module Try Buy EN 22 module Try Buy

Shells under global loads per EN 13445-3 chapter 16.14

e.g. global weight load, global moment due to wind load

The module determines the maximum permitted compressive longitudinal stress σc,all in a cylindrical shell (according chapter 16.14.7).
A given wall thickness provided, the maximum permissable individual loads (tensile force Ft,max , compressive force Fc,max and bending moment Mmax) are determined according 16.14.4

Wind loads per EN 13445-3 chapter 22.4 (Eurocode 1)

EN 22 module calculates wind loads per EN 13445-3 chapter  22.4 in connection to EN 1991 module according EN 1991-1-4 (Eurocode 1). 

Possible attachments can be ladders, vertical and horizontal piping and platforms. Several different attachments of the same type might be selected and combined with other types of attachment.

Fatigue life package - similar to AD 2000 section S1 and S2

EN 17 module Try Buy EN 18 module Try Buy
Simplified assessment of fatigue life per EN 13445 chapter 17

The requirements are based on conservative assumptions. More precise, less conservative results will usually be obtained by application of the EN 18 module. This applies also for other cyclic loads, e.g. due to changes in temperature during operation or to variation of external loads.

However it is permitted to take non-pressure cyclic loads into account under consideration of the rules and regulations of the standard.

Detailed assessment of fatigue life per
EN 13445 chapter 18

Detailed fatigue assessment of pressure vessels and their components that are subjected to repeated fluctuations of stress. The fluctuations can be caused by pressure or temperature changes or by external loads.

Using this method requires knowledge of the structural stress.

New  modules

ENAF module Try Buy ENAJ module Try Buy

Allowable external pressure for vessels outside circularity tolerance per EN 13445-3 Annex F
(incl UNRD module)

This annex provides a procedure to determine the allowable pressure for cylinders with a departure from the true circle greater than 0,5 % of radius measured from the true centre.

The included UNRD module is based on EN 13445-3 Annex E.

Alternative method for the design of heat exchanger tubesheets per EN 13445-3 Annex J (Alternative to chapter 13)

The method applies to heat exchangers of the following types: 

  • U-tube type; also exchangers with capped tubes and one tubesheet only, but also exchangers with curved tubes and an arbitrary number of separate tubesheets
  • immersed floating head 
  • externally sealed floating head
  • internally sealed floating head
  • fixed tubesheets with expansion bellows
  • fixed tubesheets without expansion bellows

Additional modules

 EN11 module package Try Buy  EN12 module package Try Buy

Round steel flanges according to EN 1092-1
Calculation per
DIN EN 13445-3 chapter 11 (Taylor-Forge method)

Modules of the package see price list

Bolted domed ends convex or concave to pressure per EN 13445-3 chapter 12
(requires EN11 module)

Design of bolted domed ends, with either full face or narrow face gaskets, and with the dome either convex or concave to pressure. The rules provided in this clause for the narrow face gasket design are well established.

 EN15 module  Try Buy EN 16.04 / EN 16.05 module Try Buy
Design of unreinforced and reinforced pressure vessels of rectangular cross-section per EN 13445-3 chapter 15

Module EN15 comprises calculation rules for the design of rectangular pressure vessels with and without reinforcements. The calculation considers only loading caused by internal overpressure. After specification of the geometry and material, the program determines the actual membrane and bending stresses and checks the geometrical conditions and the allowable stresses.

Local loads on nozzles in spherical and cylindrical shells per EN 13445-3 chapter 16.4 and 16.5

e.g. nozzles under local loads with or without reinforcement

ALTERNATIVELY: Calculating nozzle loads wit the FEM module

FEM module Try Buy
We offer an integrated FE calculation for several standard problems like nozzles with external loads on cylindrical and spherical shells or domed heads.

The nozzles may be with or without reinforcement, vertical, oblique, offset or tangential.


EN 20 module Try Buy
Reinforcement of flat walls and round ends per EN 13445-3 chapter 20 and 21

The EN20 module calculates reinforcements of flat walls acc. EN 13445-3 chapter 20 and radial reinforcement ribs of round flat ends acc. Chapter 21. The program is divided into 3 calculation sections: 

  • 20 Stayed flat walls 
  • 21.4 Radially reinforced flat round ends without peripheral moment 
  • 21.5 Radially reinforced flat round ends with peripheral moment

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