DESCRIPTION
All numerical references relate to the various diagrams included in the text.
The major process components, (ie. the heat exchanger, the feed pump and the feed
vessel) are mounted on top of a self contained, mobile, stainless steel cabinet. Within
the cabinet are two compartments with sealed doors. The upper compartment (1)
contains the pressurised water vessel and pump. The lower compartment contains the
electrical tray (2), which is mounted on slides for easy access. At the front of the
cabinet, a washable flat panel (3) provides the major control and display functions.
PROCESS ASSEMBLY
Two variable speed feed pump options are available with the FT74. The FT74-19 is a
gear pump, (4) which enables relatively high operating pressures to be achieved (up to
10.0 bar) at low product throughput (10-20 l/h) and is capable of the higher flow-rates
required when cleaning in place. However the use of a gear pump means that the
product throughput varies with applied back pressure. The FT74-18 is a progressive
cavity (Screw type) pump, which provides a very stable flow regardless of back
pressure changes. However the maximum flow achievable for clean in place is
reduced from that achievable with the gear pump.
The feed tank (5) is a 5.0 litre stainless steel open topped vessel.
The back-pressure valve (9) at the outlet from the heat exchanger is used to create a
pressure within the heat exchanger which prevents boiling of product at the elevated
processing temperatures. Turning the handle of the valve clockwise increases system
pressure and anti-clockwise reduces system pressure.
A pressure safety valve (7) protects the system from over pressure in the event of a
blockage or too high a setting of valve (9). A pressure transducer situated in the
pipeline between the feed pump and the heat exchanger measures the actual feed line
pressure for display on the control panel.
The process temperatures are measured by stainless steel semi-conductor temperature
sensors.
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