Version: February 2026

All modules incorporate the requirements of EN 13445:2021 upto and including Amendment 1, November 2025. In addition to minor enhancements, the following modifications have been made:

• Shells - Internal Pressure: Version 21.01.00

The option to use the rules in 16.15 Global loads on conical shells without knuckles has been added.

• Shells - External Pressure: Version 21.01.00

None.

• Nozzles & Openings: Version 21.01.00

None.

• Saddle & Ring Supports: Version 21.01.00

None.

• Local Loads on Cylinders: Version 21.01.00

None.

• Local Loads on Formed Heads: Version 21.01.00

None.

• Bolted Flanged Connections: Version 21.01.00

If the bolting is insufficient, the software will now use the average of the required and available bolt area to calculate W, instead of the required bolt area.

• Bolted or Welded Flat Heads: Version 21.01.00

If the bolting is insufficient, the software will now use the average of the required and available bolt area to calculate W, instead of the required bolt area.

• Fixed Tubesheets: Version 21.01.00

If the bolting is insufficient, the software will now use the average of the required and available bolt area to calculate W, instead of the required bolt area.

• Floating Tubesheets: Version 21.01.00

If the bolting is insufficient, the software will now use the average of the required and available bolt area to calculate W, instead of the required bolt area.

• U-Tube Tubesheets: Version 21.01.00

If the bolting is insufficient, the software will now use the average of the required and available bolt area to calculate W, instead of the required bolt area.

• External Loads on Vertical Vessels: Version 21.01.00

None.

• External Loads on Horizontal Vessels: Version 21.01.00

None.

• Cyclic Loading: Version 21.01.00

New Fatigue curves have been added, Class 90*, 80* and 71* can be selected as per Table 18-5.