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aprogram will make this approach less useful. Properly operating centrifugal
pumps, the most common type used, can be verified by sound, in combination with
observation of flow and pressure data, for pumps that are affected by air in the
supply stream, or through failing seals, will cavitate, and perhaps cause substantial
vibration in the attached piping. The appearance and sound of spray ricochet in a
vessel being spray CIP’d will provide areliable though not definitive indication of
proper supply pressure, and uniform delivery of CIP fluids.
Historic Operating Trends
Much of the CIP control software in current use provides for the acquisition and
storage of operating data for the important variables including level, pressure, flow,
supply and return temperatures, and conductivity or resistivity. Prior to beginning
field troubleshooting of areported or confirmed operational problem, it can be very
helpful to obtain ahistorical trend, if available, for the circuit or system involved.
Trending data may be available for
& CIP supply flow rate
& CIP supply temperature
& Steam supply temperature control valve position
& Steam header pressure
& CIP supply temperature
& CIP return temperature
& Chemical supply source tank level
& Chemical feed header pressure (if applicable)
& Circuit system fills volume set point (volume of solution in circuit)
& CIP supply conductivity set point
& Conductivity return resistivity set point
& Water additions during the recirculated wash.
Interpretation of Trending Data
Some examples of operating problems that areview of trending data may be
beneficial include
Repeated water addition during acycle as the result of low level in aCIP recirculation
tank (or air separation tank) will dilute the chemical solution and thus cause
reduced conductivity.
Water addition may be the result of CIP circuit hydraulic imbalance, as the result of a
failing return pump (generally seal or suction side leak). AU-Bend transfer
leak, an improperly tightened or positioned return hose or spool piece
installation may cause either loss of solution, and hence level, or incorporation
of air in the supply to pumps.
Supply flow problems of alow or high flow nature and may be attributed to one of
many issues. The alarm may be intermittent rather than continuous. The
historical trend data can provide information as to when the intermittent
alarm occurs, or at what point flow control has been lost.
PROGRAM FAILS TO START
Rush
Most CIP programs are initiated by asequence of manual operations which include
selection of ( i )the equipment to be cleaned, ( ii) the selection of the applicable CIP