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106<br />

Chemical<br />

loop<br />

AB<br />

FE<br />

Chemical<br />

block<br />

loop<br />

PS<br />

COND<br />

FCV<br />

Steam<br />

HXR<br />

RTD T LS<br />

Restrictor<br />

COND<br />

CIP<br />

supply pump<br />

(VFD)<br />

0.2 Micron<br />

filter<br />

CIP<br />

recirc<br />

tank<br />

SG<br />

TOV<br />

Rinse to drain<br />

RTD<br />

Samp<br />

Ret<br />

probe<br />

Samp<br />

CIP return<br />

Multi-Tank CIP Configuration with CIP RECIRC TANK after CIPR to Drain<br />

This alternative to Figures 7and 8provides mix-proof valve separation of the<br />

CIP recirc tank and HWFI tank, assuring no possibility of either alower grade<br />

water from the CIP recirc tank, or wash solution and soil contacting any part of<br />

the HWFI tank and supply piping. And, placing the CIP recirc tank on the end<br />

of the circuit assures that it is fully subjected to all of the time, concentration,<br />

and temperature criteria applied to cleaning the process circuit.<br />

This second multi-tank CIP skid illustrated in Figures 9and 10 is similar to the<br />

above but differs in two respects. Astandardshutoffvalve controls flow through the<br />

top port of amix-proof valve (not through the valve passage) for flow from the CIP<br />

recirc tank to drain. The mix-proof valves on the HWFI tank and CIPR recycle tank<br />

outlet lines connect the vessels to the CIP pump with the equivalent of “doubleblock-and-bleed”<br />

separation of the two streams. The wash recycle circuit is<br />

illustrated in Figure 9and the rinse to drain in Figure 10.<br />

The two systems are comparable with respect to program control equipment<br />

including instrument sensors and I/O, and the multi-tank CIP skids also<br />

HBV<br />

RTD<br />

CIPR<br />

recycle<br />

LP<br />

Water<br />

0.2 Micron<br />

filter<br />

Res<br />

probe<br />

HWFI<br />

tank<br />

CIP supply<br />

HWFI<br />

Seiberling<br />

Rupure<br />

disc<br />

FIGURE 8 The heavy lines on this diagram depict the rinse to drain flow through aconventional<br />

two-tank clean-in-place skid.

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