K-Patents PR-23 - Manual (Page 26)

18 PR-23 instruction manual
4.2.1 Recommended wash pressures and times
The recommended wash pressures and times are given in the tables below.
Wash medium parameters for integral wash nozzles in PR-23-AP/GP
Minimum above
process pressure
Maximum above
process pressure
Wash
time
Recovery Interval
Steam (SN) 2 bar (30 psi) 4 bar (60 psi) 3 s 20–30 s 20–30 min
Water (WN) 2 bar (30 psi) 4 bar (60 psi) 10 s 20–30 s 10–20 min
High pressure water (WP) 15 bar (220 psi) 40 bar (600 psi) 10 s 20–30 s 10–20 min
Wash medium parameters for flow cell wash nozzle AFC
Minimum above
process pressure
Maximum above
process pressure
Wash
time
Reco-
very
Interval
Steam (SN) 3 bar (45 psi) 6 bar (90 psi) 3–5 s 20–30 s 20–30 min
Water (WN) 3 bar (45 psi) 6 bar (90 psi) 10–15 s 20–30 s 10–20 min
High pressure water (WP) 25 bar (350 psi) 35 bar (500 psi) 10–15 s 20–30 s 10–20 min
Wash medium parameters for Safe-Drive Isolation valve nozzle SDI
CONC % value Minimum above
process pressure
Maximum above
process pressure
Wash
time
Reco-
very
Interval
Steam (SN) 10–30 % 2 bar (30 psi) 4 bar (60 psi) 2–3 s 20 s 120–360 min
30–60 % 3 bar (45 psi) 6 bar (90 psi) 3 s 20 s 20-60 min
60–90 % 4 bar (60 psi) 8 bar (120 psi) 3–5 s 20 s 15-25 min
High pressure water (WP) 25 bar (350 psi) 50 bar (725 psi) 10–15 s 20 s 5–20 min
Important: In steam wash, do not exceed the recommended wash times, because
some process media may burn to the prism surface if steamed for longer time. In case
of coating, shorten the wash interval.
See also Section 6.7.2 for the Automatic wash cut parameter.
Note: In water wash, water temperature should be above the process temperature.
Note: The check valve pressure drop is 0.7 bar (10 psi).
4.2.2 Prism wash systems
The prism wash system for steam is described by Figure 4.1 and for sanitary systems
Figure 4.2. The prism was system for high pressure water is described by Figure 4.4
and for sanitary systems Figure 4.5.
Warning! In high pressure wash systems, pressure increase can occur in a closed
pipe section when the high pressure pump is operated. K-Patents recommends to
mount a pressure relief valve in the pipe section. Relief pressure should be according
to pipe pressure rating.