Chemical Feed Systems
CIP cleaning chemicals may be supplied to the CIP Recirculating Unit (or CIP Skid) directly from Shipping Containers (Barrels or Totes) or from Bulk Storage, preferably via a "Day-Use" container. Chemical pumps located within a chemical pump enclosure, or wall mounted above the containers, may discharge directly to the CIP recirculation tank, as shown on the upper portion of the figure to the left, or to a Chemical Feed Loop (slip-stream) as shown in the lower portion. of the drawing. Flush, wash and rinse soloution flow continuously through the loop at about 3-5 Gpm when the CIP System is operating, and chemicals are added and immediately diluted within the confined enclosure. The diaphragm-type blocking valve is normally open and is closed only for the CIPS line air-blow.
Piston-type,
diaphragm-type and peristaltic pumps may be used for chemical feed, with
the delivered quantity controlled by time, conductivity, or both. Single-Use
CIP Systems which are designed to operate with a known volume of solution
in the circuit are often supplied by piston-pumps or diaphragm type chemical
pumps modified for single cycle (two-stroke) delivery for pulsed control
via counter based logic. Concentration is based on adding a known volume
of chemical to a known quantity of water. Final results may be checked
via a conductivity sensor. The photograph at the right shows shelf-mounted 
pumps connected to a Chemical Feed Loop of the CIP system previously
discussed under CIP Recirculating Units. The Chemical
Feed Loop, if used, should be constructed of 1/2", 3/4", or 1"
stainless steel tubing from the discharge manifold of the CIP supply pump
to the fitting on the top of the recirculation or air separation tank,
or to the CIPR line just before the drain valve on single-use systems which
have by-pass recirculation capability. An orifice plate must be placed
in the supply connection to limit water flow through the loop to approximately
3-5 Gpm and minimize the pressure against which the chemical pumps must
discharge.
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