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CIP System Troubleshooting Guide 299
program, and ( iii) the proper recipe. The program and recipe may be selected
automatically or by the operator. After the menu driven HMI selections are made,
the control system may provide asummary of the manual preparations required,
and an HMI prompt may requireconfirmation to assurethat the manual activity has
been completed. After this confirmation, the CIP program will confirm all CIP
permissives and check applicable interlocks. If all are in compliance, the program
will be initiated. CIP programinitiation failures are usually attributed to issues with
the CIP “batch” assembly or CIP permissive and interlock failures.
Batch Recipe Failure
If operator selection of aCIP batch recipe is required,afailure to properly assemble
or include required components will result in aCIP circuit initialization failure. For
examples, consider
& If the operator selects a single pass rinse, when the operational sequence
demands arecirculated chemical wash program, the CIP initialization will fail.
& The field devices (pumps, valves, agitation) for aCIP circuit are controlled by a
CIP device sequence. If the CIP device sequence does not match up with the
selected CIP program, the CIP circuit initialization will fail.
& The CIP device sequence also can define the circuit boundary and be used to
acquire the equipment to be cleaned. If all devices and equipment within the
CIP circuit boundary are not available for CIP operations, the CIP circuit
initialization will fail.
& The CIP programs for unique CIP circuits are optimized by applying circuit
specific recipe parameters, defining critical CIP parameters of exposure time,
temperature, concentration, and physical action, as well as the noncritical
parameters, like drain and air blow times. ACIP circuit boundary may have
several recipes, and if the selected CIP recipe does not match up with the
selected CIP program, the initialization will fail.
Permissive Failure
Permissives are established by the pre-checks performed by software prior to CIP
circuit initialization used to confirm that the operating conditions will ensure the
CIP programs success. Typical permissives include confirming the availability of all
support utilities, process equipment, and the required physical setup to establish
the CIP circuit.
The utility of greatest concern is the water supply. The minimum water
volume required must be available, and the distribution loop must be operating
at the required delivery pressure and temperature for CIP operation. Quality
determination may involve an operator prompt to sample and test. Similar utility
confirmation checks may be performed for plant steam, chilled water, clean air for
air blows, cleaning chemical supply,and waste discharge capacity if pretreatment of
CIP waste in needed.
The process equipment to be cleaned may be defined within the circuit
boundary. As there may be overlapping process/CIP boundaries, an adjacent
process operation may need to be concluded to permit automation acquisition of
the devices for cleaning operations.