We recommend a flow velocity of at least 2 m/s.
8.2
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.
The ultimate temperatures, chemicals, concentrations and contact time to be
used must be determined by the plant operator along with its chemical supplier.
Cleaning and Passivation
Passivation
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