GEA D-tec D, Operating Instruction

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9.2 Sterilisation
The valve is suitable for SIP sterilisation (sterilisation in place). The permissible
sterilisation media and temperatures for the various sealing materials are listed in
the resistance table, see . Other sterilisation media (e.g. H
2
O
2
) must be approved
by the manufacturer.
Hint!
TEFASEP
®
gold valve seat seals achieve optimal sealing only after an
initial CIP- or SIP cleaning.
CIP or SIP cleaning operating conditions:
•
Medium: Lye, hot water or saturated steam
• Temperature: >121 °C (250 °F)
• Holding time: 20 … 30 min
The valve must be brought to the closed position for a brief period
(min. 5 seconds) immediately after CIP or SIP cleaning. During
commissioning, regularly check all sealing points for leaks. Exchange
defective seals and repeat the CIP or SIP process.
9.3 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
Sterilisation
430BAL013307EN_8
40 04.08.2022