4. Depending on the physical properties of the product, and which feed pump
option is fitted, the flow and system pressure will now be completely different
from those with water and will have to be readjusted. The changes in the flow
rate and in the physical properties in the material will mean that the holding
tube temperature may vary significantly from the set point during the
transition. In this case it will be necessary to wait whilst the temperature
controller re-establishes the correct temperature.
5. When all of the parameters are constant, it is possible to begin taking samples
of the processed product.
Operation using Beverages containing Dissolved Gas
In order to retain dissolved gas in a liquid, relatively high system pressures are
necessary. These pressures can be up to 10 bar. Normally the back pressure is applied
by adjustment of the valve (9) on the product outlet of the heat exchanger. Higher
pressures can only be obtained using a combination of this valve and a higher product
throughput.
Beverages containing dissolved gas are usually processed at relatively low
temperatures (70-90°C). These temperatures are achievable even at higher product
throughputs (up to 50 litres per hour). When using higher product throughputs, UHT
temperatures cannot be achieved.
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