K-Patents PR-21-S - Manual (Page 35)

4 Prism wash systems 29
4.3 Prism wash with integral high pressure water nozzle
Integral high pressure water prism wash is recommended to be used in applica-
tions where conventional wash (Section 4.2) is insufficient to remove coating. It
can be used e.g. in the measurement of starch, beer worth, green liquor in the
wood pulp industry or directly after the evaporation in the sugar industry.
The Figure 4.4 describes the recommended components for a prism wash system
with integral high pressure water nozzle. The components can be supplied by K-
Patents.
Note the following items in the high pressure wash system:
• Integral water wash nozzle (HPN) is built on a sensor which has a Sandvik
clamp or a flange connection.
• For mounting a flow cell see Section 4.4
• Check valve PR-3303 is recommended to all washing applications.
• The high pressure pump should be able to keep a pressure of 100 bar for a 1.25
mm (0.05 in) diameter nozzle.
• For recommended wash pressures and times, see Section 4.5 (Table 4.1)
High pressure pump
Use K-Patents PR-3602-SP-400 high pressure pump. K-Patents recommends to
use 33 phase) pumps with local voltages. Inlet water temperature should be warm,
about 60 °C. K-Patents delivers high pressure pump with 8 meter rubber high pres-
sure hose. Customer can also make high pressure line between pump and nozzle
from stainless steel pipes which are suitable for pressures up to 150 bar. With
stainless steel pipes K-Patents recommends to use heat trace and insulation to
keep washing water warm (60-70°C).
Warning! Pressure increase can occur in a closed pipe section when the high pres-
sure 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.
The DTR (Indicating transmitter) relay is used to drive the Power relay unit
PR-3603-400. The Power relay unit drives the high-pressure pump and the water
valve. Pump relay has an overload relay which will switch off the pump if current
goes over the set limit. The configuration of the Relay is made from the Indicat-
ing transmitter keyboard. For the wiring of the high-pressure components, see
Figure 4.5