Passivation - GEA VARIVENT Operating Instructions Manual

These factors can be combined in such a way as to make an optimal cleaning
result probable. 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
contact time of 6 to 8 hours.
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) at approx. 80 °C (176 °F) at a concentration of 3 % and a
3
Cleaning
Passivation
37