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effort being performed relatively “hands off” by recording observations, doing
swabbing and rinse sampling, etc. to confirm the successful optimized cycle.
CIP PROGRAM PHASES
Rush
Cleaning programs are made-up of “phases,” the building blocks used to create a
CIP “batch,” also referred to as a “master recipe.” The foundation for phase
determination is founded by the internationally recognized American National
Standards Institute/Instrumentation Systems and Automation Society (ANSI/ISA)
S88 (Parts 1–3) batch control standard. The S88 standard uses identical and/or
similar operations that are repeated during aCIP batch to define aphase. For
example, drain phases may be repeated multiple times during aCIP program.
There are anumber of CIP phases or control module operations that are
inherent in every CIP program, but are not described below. These operations
include CIP circuit field device sequencing, water surge tank charging, CIP unit
level, flow and temperature controloperations. These CIP operations run in parallel
with the phases noted below and are applied to nearly every CIP program, but are
tailored to the CIP unit and CIP circuit design. CIP programs use the following basic
phase building blocks to create cleaning programs:
CIP Program Initiation Phase
Establishes the CIP circuit boundary and acquires devices (pumps, valves, equipment)
within the boundary, ensures adequate utilities and chemicals are available
for the CIP program and checks permissives and interlocks.
Rinse Phase
Rinse water (or) solution is supplied from the CIP unit, and this phase is used to
flush the CIP circuit of all freerinsing soil and chemical solutions to waste. The rinse
phase may be repeated multiple times during aCIP programasapre-flush prior to
achemical wash, or after achemical wash as apost-wash rinse. Although the
majority of rinse phases areperformed with water,the rinse may also be performed
with abase, acid, saline or solvent solution.
Gas Blow Phase
This phase uses compressed, filtered gas to clear the CIP supply and process piping
to the process equipment being cleaned to enhance aclear transition between
dissimilar phases, when necessary.
Intermediate Drain Phase
Used between CIP phases to actively transfer spent wash and rinse solutions from
the circuit boundary to enhance aclear transition between dissimilar phases.
Chemical Wash Phase
This phase performs the chemical cleaning duty and may be either single pass
through the circuit to waste or recirculated through the CIP circuit. The chemical
wash may be an alkaline or acid solution in aqueous cleaning programs. Solventbased
cleaning programs may apply process solvents, such as alcohol, methanol or
dimethyl sulfoxide (DMSO) to remove the process soil.