6. Protection against external aggression

6.1 Exterior and soil aggression

In terms of external stress, pipes, fittings and accessories are subject to risks such as :

• surface oxidation due to weathering during transport and storage before installation; their appearance must therefore be protected by exterior coatings resistant to atmospheric corrosion;

• external corrosion when laid in corrosive soils; different levels of additional protection can be applied to ductile cast iron pipes and fittings, depending on the corrosiveness of the soil;

• mechanical aggression by certain soils, when it is not possible to use non-damaging soils (isolated locations, mountains...).

Our ductile...