Untitled

178
Mezz.
Floor(ref.)
V-5
1000L
CIPS to TP-3
T
V-4
1000L
CIPS loop
V-3
1000L
CIPR header
TP-1
T
Portable
CIP pump
CIPS to TP-2
T
Short hose
V-1
1000L
T
Long hose
entrapped air held at the eye of the impeller by centrifugal force if the line to the
pump slopes upwardstowardthe source vessel in an uninterrupted manner.Highspeed
(3500 rpm) return pumps are subject to substantial cavitation when air locked
and for this reason are generally not used, or needed, to overcome static head and
friction loss in CIPR side piping.
Liquid-ring (self-priming) pumps can overcome some installation and operating
deficiencies at increased cost and power requirements. However, iffitted
with acasing drain and drained after each program, it will be self-priming only
when the initial flush water sprayed into the vessel flows by gravity to and into the
pump inlet. Also, as fluid temperature increases, liquid-ring self-priming pumps
become less effective.
Figure 3shows aCIPR pump mounted on astainless steel dolly for portability.
Aflexible hose would connect the suction of the portable CIPR pump to the outlet
discharge line from the process tank being cleaned. Another flexible hose will
connect the portable CIPR pump discharge to the fixed-piping CIPR line. Figure 4
shows afixed base-mounted CIPR pump, which is located in autility area (gray
space) adjacent to the process that it serves.
Eductor Return Flow
The high-speed motive pump and eductor incorporated in eductor return recirculating
units with air separation tanks and used as the sole motive force will create 15
to 18 in. of vacuum. Note that eductor performance is limited by water temperature
relative to the vacuum capacity being generated, decreasing to z 12 in. of vacuum
at 808 C. An eductor will pump both air and water. Whereas an eductor-based
system appears less susceptible to air leaks in the return line, in practice this is not
T
V-2
1000L
T
From
TP-3 tanks
From
TP-2 tanks
T
LS
Primary
CIPS
T
Water
Lebowitz
Air blow
VM
T
CIP supply
pump
FIGURE 2 Illustration of pumped CIPR with aportable return pump. Abbreviations :CIPR, cleanin-place
return; CIPS, clean-in-place supply.