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CIP Distribution Piping Systems 191
CIPS valve group. On the inlet side of this valve group, lines slope back to the CIP
system and on the discharge side, lines slope toward the process area destination.
Likewise, for CIPR piping, there is ahigh point from where lines slope either back to
the CIPR pump at the tank being cleaned or forward to CIPR at the central
CIP system.
As with all sanitary piping systems, proper installation methods must be used
to ensure that piping is not only “hung” but also supported, so as to retain the
original intended slope. Permanently installed spray devices should be installed
using aspray supply connecting manifold that allows for easy removal. The CIPS
piping and the spray manifold should be supported so that stress is not present at
clamps, which could cause poor alignment and leaking.
Areas requiring routine access by operators or maintenance personnel must
be preplanned. There is need to access sample points in the CIPS and CIPR
distribution piping. This includes both sample valves used to obtain solution
during various points of the CIP cycle as well as piping access locations to be
used for swabbing during cleaning validation. Also, permanently installed valves
must be accessible for routine maintenance.
CIPS AND CIPR HYDRAULIC CONSIDERATIONS
Before starting to design aCIPS and CIPR piping system, an understanding of
the hydraulic factors is important. Figure 12 illustrates the concepts discussed
below.
CIPS hydraulic factors for tank circuits are as follows:
& CIPS static head loss is due to the difference in height between the CIP
recirculation tank level and the spray device of the process tank being
cleaned (Fig. 12, elevation REF AtoREF B).
& CIPR static head loss is due to the difference in height between the process tank
level and the CIP recirculation tank return point connection at aspray device,
nozzle, etc. (Fig. 12, elevation REF CtoREF D).
& CIPS and return friction head loss is due to the energy necessary to move flow
through the piping system at agiven flow rate. The manufacturers of sanitary
components often publish data tables for friction head loss through valve,
fittings, and sanitary tubing. Note that sanitary “OD tubing” has different
internal diameter than industrial “schedule piping” and, therefore, industrial
friction loss data tables are not correct for sanitary OD tubing design.
& The CIP spray device has arequired operating pressure, both on the CIPS side
in the case of the process tank being cleaned and on the CIPR side if aspray
device is used for recycle of flow back to the CIP system.
Thus, the total CIPS or CIPR head requirement is the sum of static head, friction
head, and spray device operating pressure.
For line circuits, ( i )there is no spray device involved for atarget vessel being
cleaned, ( ii)static head loss is minimal because flow both begins and ends at the CIP
system, and ( iii)aCIPR pump is not required.Inthis case, the hydraulic calculation
is reduced to the sum of friction head loss for CIPS and CIPR piping, possibly plus
the operating pressureofaspray device if one is used for recycle of flow back to the
CIP system.