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CIP Spray Device Design and Application 173
Pulse
4
3
Figure 11 illustrates the application of afilter housing in atransfer line to a
vessel used also as the CIP supply for the vessel sprays. Proper engineering design
of the process piping at the filter housing inlet can provide for CIP of all of the
fittings, valves, and gages typically removed and manually cleaned.
SPRAY COVERAGE VERIFICATION
H
Next
tank
Vent
CA
H H
2 1
Pulse
CIPR
Motive pump
From
process
CIPS
CIP unit
CIPS
CIPS
air
CIPS pump
FIGURE 11 This schematic illustrates how afilter housing may be incorporated in the transfer line
used to convey process and CIP fluids to the vessel and cleaned with the vessel and piping in asingle
circuit. The spray and disc distributor devices shown in Figures 8and 9may be used in this manner.
In the mid-1990s, this industry began implementation of atest to assure spray
coverage of all product contact surfaces of any vessel. No universally accepted
standard has been established for this test, commonly referred to as the “riboflavin
coverage test” and it has been based on end user preferences. The American Society
of Mechanical Engineers (ASME) Bio Process Equipment (BPE) committee has set
forth arecommended practice in its 2002 edition.