This paper proposes a general methodology for the structural
integrity assessment of tubular towers containing lack of pene-
tration defects. The analysis has been particularised to the case
of a given set of wind towers with lack of penetration defects on
certain sections. Fracture and fatigue have been considered as the
major causes of concern and some conservative but reasonable hy-
potheses (i.e., defects behaving as cracks) have been established.
The structural integrity assessment has been performed using the
FITNET FFS procedure and the corresponding lack of penetration