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& A1000 Lmixing vessel, having a4 0 diameter with a1-1/2 00 fill line and 1 00 reagent
addition line. The tank discharge line is 2 00 in diameter,and the outlet is equipped
with avortex breaker. Although the tank could be cleaned with spray devices
operating at 115to135 lpm, the tank is equipped with spray devices specified at
165 lpm to accommodate for proper flow velocity in the 2 00 discharge line.
& An evaluation of the process/CIP piping reveals 200 0 of 2 00 CIP piping, with 100 0
of 1-1/2 00 ,and 10 0 of 1 00 sanitary tubing. The following breakdown of piping
lengths with line diameters noted: The CIP unit recirculation tank requires 60 Lof
water to charge prior to establishing circuit operation and recirculation. Based on
this data, the total system fill volume is estimated roughly at 200 L.
& The CIP circuit device sequence involves the following sub-paths, which repeats
every 60 seconds:
Step 1. Spray tank—40 seconds
Step 2. Spray tank and pressure wash reagent inlet—10 seconds
Step 3. Spray tank and pressure wash fill line—10 seconds
Return to Step 1
Recirculation CIP Programs
Table 1describes atypical phase based on recirculating CIP program using cleaning
chemicals “A” and “B.” The table describes the phase, phase function and water
usage to clean the example circuit. The time requirement does not include operator
time to assemble the CIP Circuit.
Single-Pass CIP Programs
Acomparable single-pass CIP program may begin with achemical wash to provide
aflush, which includes the benefits of chemical cleaning, while reducing waste
generation by elimination of the normal prerinse. However,awater prerinse may be
required if apotent soil must be flushed to an alternate drain destination prior to the
chemical wash. Table 2denotes the linked phase sequence for atypical single-pass
CIP program utilizing cleaning chemicals “A” and “B,” with phase function, water
usage and duration noted.
Schedule and Utility Comparison—Single-Pass vs. Recirculated Cleaning
These comparable CIP programs applied to our typical circuit illustrate the
difference between the single-pass and the recirculated CIP programs, enabling a
comparison of program time, water usage, and waste generation.
& Single use, recirculated CIP cleaning—2860 L of water required and waste
generated over a64minute program.
& Single-pass CIP program—4600 Lofwater required and waste generated over a
46 minute program.
& Single-pass CIP program with prerinse—4900 Lofwater required and waste
generated over a48minute program.
It should be noted that gas blows between flow phases in both programs may
be considered unnecessary as the CIP supply line will be flushed with the next
solution. However,the gas blow and drain process arecritical for circuits not readily
drained by the CIP return system, as the process equipment puddle containing soil