Version: December 2022

All modules incorporate the requirements of PD 5500:2021 upto and including Amendment 2, September 2022. In addition to minor enhancements the following modifications have been made:

• Shells - Internal Pressure : Version 21.02.00

In section 3.4.2.2, when designing using Construction Category 3, the limit for design stress of Rm/5 is now applicable for steels in material group 11 in addition to those in group 1.

• Shells - External Pressure : Version 21.02.00

In section 3.4.2.2, when designing using Construction Category 3, the limit for design stress of Rm/5 is now applicable for steels in material group 11 in addition to those in group 1.

• Nozzles & Openings : Version 21.02.00

In section 3.4.2.2, when designing using Construction Category 3, the limit for design stress of Rm/5 is now applicable for steels in material group 11 in addition to those in group 1

• Saddle & Ring Supports : Version 21.02.00

In section 3.4.2.2, when designing using Construction Category 3, the limit for design stress of Rm/5 is now applicable for steels in material group 11 in addition to those in group 1.

• Local Loads on Cylinders : Version 21.02.00

In section 3.4.2.2, when designing using Construction Category 3, the limit for design stress of Rm/5 is now applicable for steels in material group 11 in addition to those in group 1.

When using the alternate rules for local loads in G.2.8, the formula for the Interaction of Loads (G.2.8-13) has been changed in line with the formula (16.4-15) in EN13445-3.

• Local Loads on Formed Heads : Version 21.02.00

In section 3.4.2.2, when designing using Construction Category 3, the limit for design stress of Rm/5 is now applicable for steels in material group 11 in addition to those in group 1.

When using the alternate rules for local loads in G.2.8, the formula for the Interaction of Loads (G.2.8-13) has been changed in line with the formula (16.4-15) in EN13445-3.

• Bolted Flanged Connections : Version 21.02.00

In section 3.4.2.2, when designing using Construction Category 3, the limit for design stress of Rm/5 is now applicable for steels in material group 11 in addition to those in group 1.

All uses of the numerical value of pi have been replaced with pi, i.e 0.785 has been replaced with pi/4.

• Bolted or Welded Flat Heads: Version 21.02.00

In section 3.4.2.2, when designing using Construction Category 3, the limit for design stress of Rm/5 is now applicable for steels in material group 11 in addition to those in group 1.

• Fixed Tubesheets : Version 21.02.00

In section 3.4.2.2, when designing using Construction Category 3, the limit for design stress of Rm/5 is now applicable for steels in material group 11 in addition to those in group 1.

• Floating Tubesheets : Version 21.02.00

In section 3.4.2.2, when designing using Construction Category 3, the limit for design stress of Rm/5 is now applicable for steels in material group 11 in addition to those in group 1.

• U-TubeTubesheets : Version 21.02.00

In section 3.4.2.2, when designing using Construction Category 3, the limit for design stress of Rm/5 is now applicable for steels in material group 11 in addition to those in group 1.

• External Loads on Vertical Vessels: Version 21.02.00

In section 3.4.2.2, when designing using Construction Category 3, the limit for design stress of Rm/5 is now applicable for steels in material group 11 in addition to those in group 1.

• External Loads on Horizontal Vessels: Version 21.02.00

In section 3.4.2.2, when designing using Construction Category 3, the limit for design stress of Rm/5 is now applicable for steels in material group 11 in addition to those in group 1.

• Cyclic Loading: Version 21.02.00

In section 3.4.2.2, when designing using Construction Category 3, the limit for design stress of Rm/5 is now applicable for steels in material group 11 in addition to those in group 1.