Version: December 2023

All modules incorporate the requirements of PD 5500:2021 upto and including Amendment 3, September 2023. In addition to minor enhancements the following modifications have been made:

• Shells - Internal Pressure : Version 21.03.00

For category 3 vessels, changes have been made to section 3.4.2.2.

• Shells - External Pressure : Version 21.03.00

For category 3 vessels, changes have been made to section 3.4.2.2.

• Nozzles & Openings : Version 21.03.00

For category 3 vessels, changes have been made to section 3.4.2.2.

The calculation of pressure area Ap has been changed in 3.5.4.9 for pad type nozzles, it now takes in the account the pressure area in the nozzle bore.

• Saddle & Ring Supports : Version 21.03.00

For category 3 vessels, changes have been made to section 3.4.2.2.

• Local Loads on Cylinders : Version 21.03.00

For category 3 vessels, changes have been made to section 3.4.2.2.

• Local Loads on Formed Heads : Version 21.03.00

For category 3 vessels, changes have been made to section 3.4.2.2.

• Bolted Flanged Connections : Version 21.03.00

For category 3 vessels, changes have been made to section 3.4.2.2.

• Bolted or Welded Flat Heads: Version 21.03.00

For category 3 vessels, changes have been made to section 3.4.2.2.

• Fixed Tubesheets : Version 21.03.00

For category 3 vessels, changes have been made to section 3.4.2.2.

• Floating Tubesheets : Version 21.03.00

For category 3 vessels, changes have been made to section 3.4.2.2.

• U-TubeTubesheets : Version 21.03.00

For category 3 vessels, changes have been made to section 3.4.2.2.

• External Loads on Vertical Vessels: Version 21.03.00

For category 3 vessels, changes have been made to section 3.4.2.2.

• External Loads on Horizontal Vessels: Version 21.03.00

For category 3 vessels, changes have been made to section 3.4.2.2.

• Cyclic Loading: Version 21.03.00

For category 3 vessels, changes have been made to section 3.4.2.2.