scope:

The following rules on analysis for cyclic loading apply to pressure-bearing parts of pressure vessels made of 

- ferritic and austenitic rolled and forged steels, 

- spheroidal graphite cast iron grades as specified in Annex 5,

- wrought aluminium alloy materials as specified in Annex 6,

manufactured and tested according to the B series of AD 2000-Merkblätter in conjunction with the W and HP series of AD 2000-Merkblätter to take into account cyclic loads¹) arising as a result of internal pressure, temperature differences and additional external forces and moments at the most highly-loaded points (see Annex 1). 

This specification need not be applied if the conditions in accordance with AD 2000-Merkblatt S 1 are satisfied. 

A reduction in the permitted number of stress cycles is not required at low operating temperatures within the application limits of Stress Categories II and III in accordance with AD 2000-Merkblatt W 10.

1) The term "cyclic loading" is meant here in a comprehensive sense as the variation over time of a loading regardless of the magnitude and arithmetic sign of the mean value.