| Frodingham
sheet piles of ‘Z’ section are normally
preferentially attacked on the side pan (web) and the
outpan corner.
In most design cases this is not initially structurally
critical.
The sidepan being the thinnest part of the pile cross
section, a ‘Z’ section pile gives lower
resistance to perforation than other pile sections.
The maximum web thickness for ‘Z’ piles
is 12mm, at a reasonable estimate of corrosion rate
of 0.5mm per year this would be holed in 24 years. However
smaller sections have thickness of 9mm, which would
allow perforation in 18 years or even 10 years, which
has unfortunately been some owner’s experience.
Also see: Case
Histories
For further detail on the preferential attack on steel
sections and piles see:
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