Depending on the cleaning method (medium concentration, temperature and
contact times), the seals are affected to different degrees. This can impair the
function and the service life.
9.2 Passivation
Before commissioning a plant, passivation is commonly carried out for long pipes
and tanks.
Valve blocks are usually excepted from this. Passivation is typically performed
using nitric acid (HNO
3
) at approx. 80 °C (176 °F) at a concentration of 3 % and a
contact time of 6 to 8 hours.
Cleaning
Passivation
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