Pressure Equipment Calculator

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About this app

Pressure Equipment Calculator – EN 13445, is a mobile application which calculates minimum thicknesses for pressure equipment components, according to the European PED harmonized standard, EN 13445, for unfired pressure vessels.

The application covers calculation of:

-Cylindrical shells
-Conical shells
-Klöpper heads (torispherical heads)
-Korbbogen heads (torispherical heads)
-Elliptical heads
-Hemispherical heads and shells
-Welded flat heads

Calculations can be carried out for internal and external pressure in all modules.

Calculations are carried out for the design- and the testing situation.

Testing pressure is calculated according to EN 13445-5.

The application includes the possibility to calculate unreinforced openings in all modules.

Minimum distance between unreinforced opening and shell discontinuity are calculated.

For klöpper, korbbogen and elliptical heads it is possible to calculate openings in the knuckle region.

A total of 588 materials are included covering all parts of EN 10028 (plate), EN 10216 (seamless tubes) and EN 10217 (welded tubes).

Allowable stresses are calculated automatically based upon the given temperature and chosen testing group.

Warnings and errors are generated if criterions within EN 13445 are not fulfilled.

All calculated thicknesses are printed, with high-lightening of the maximum value.

There is a possibility to save, print or email the calculated results.

This tool can be used by manufactures during the preliminary design phase or when putting together an offer for a costumer.

Technical personal can easily obtain quick results during inspection of old, corroded, in-service pressure equipment.

The application can also be used during QA of the final technical documentation or by notified bodies/inspection agencies when evaluating technical documentation.

A free version is also available, which includes commercials and limitations regarding pressure and temperature.

User manual (pdf):


Example calculation:
Updated on
May 18, 2020

Data safety

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What's new

-Previously used 0.9 factor removed for design stresses acc. TG4 (z=0.7) acc. EN 13445-3
-Minor bug fixes