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Single-Tank Bypass or Recycle Operation
If it is necessary to clean aline circuit, i.e., acircuit consisting of only piping or piping
plus equipment such as ahomogenizer,centrifuge, or filter housing(s), the addition
of aCIPR recycle valve, as shown in Figure 3enables the above-described system
to operate with WASH RECYCLE through the CIP skid mounted tank.
The suggested design using acone bottom tank and leg to create the desired
NPSH with minimum volume in the tank is beneficial to the reduction of water,
chemicals, and time. The return flow must be introduced to the tank through a
spray to continuously flush the tank head and sidewalls and prevent the development
of the traditional “bathtub ring” during the solution wash. The RINSE TO
DRAIN is as described previously.
Single-Tank Total Recycle Operation
Some CIP applications may include circuits or operating conditions that are
expected to produce substantial air entrainment in CIPR flow, examples being the
use of aliquid ring return pump to overcome undesirable CIPR design conditions,
or the utilization of injected air to the CIPS for spray CIP of large filter housings. The
single-tank bypass skid performance would be degraded by the presence of
massive air in the CIPR flow, but the many other advantages of the small, simple
CIP skid concept may be achieved by configuring the CIP skid as shown in Figure 4.
The supply side of the system is unchanged but CIPR flow is always to the CIP
recycle tank via the CIPR recycle valve. Most of the minimal water, time, and
chemical use advantages of the single-tank bypass CIP skid may be retained by the
Chemical
loop
AB
FE
FCV
Steam
Water
Chemical
loop
tank
block
PS
COND
HXR
RTD T LS
Restrictor
COND
CIP
supply pump
(VFD)
SG
AWFI
TOV
HBV
Tank
recycle
RTD
Drain
Samp
Ret
probe
Chemical
loop
Res
probe
T
Water
tank
CIP supply
AWFI
Wash recycle Rinse to drain
CIP supply
CIP return
Seiberling
CIP return
FIGURE 4 The single-tank single-use recirculation operation system is effective in handling return
flow with substantial entrained air.