Flooded type water cooled screw chiller (PCB Control)
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6.2 Pressure vessels
6.2.1 General
Monitoring during operation, re-qualification, re-testing and re-testing dispensation:
Follow the regulations on monitoring pressurized equipment.
It is normally required that the user or operator sets up and maintains a monitoring and maintenance
file.
Follow the control programs.
If they exist follow local professional recommendations.
Regularly inspect the condition of the coating (paint) to detect blistering resulting from corrosion. To
do this, check a non-insulated section of the container or the rust formation at the insulation joints.
Regularly check for possible presence of impurities (e.g. silicon grains) in the heat exchange fluids.
These impurities maybe the cause of the wear or corrosion by puncture
Filter the heat exchange fluid check and carry out internal inspections as described in EN 378-2,
annex C.
In case of re-testing please refer to the maximum operating pressure given on the unit nameplate.
The reports of periodical checks by the user or operator must be included in the supervision and
maintenance file.
6.2.2 Repair
Any repair or modification, including the replacement of moving parts:
Must follow local regulations and be made by qualified operators and in accordance with qualified
procedures, including changing the heat exchanger tubes.
Must be made in accordance with the instructions of the original manufacturer. Repair and
modification that necessitate permanent assembly (soldering, welding, expanding etc.) must be
made using the correct procedures and by qualified operators.
An indication of any modification or repair must be shown in the monitoring and maintenance file.
6.2.3 Corrosion allowances:
Gas side: 0 mm
Heat exchange fluid side: 1 mm for tubular plates in lightly alloyed steels, 0 mm for stainless steel plates
or plates with copper-nickel or stainless steel protection.
6.2.4 Operating life
The evaporator and condenser are designed for: prolonged usage of 20 years for high-quality materials.
6.2.5 Security
The unit is equipped with safety valves. And ball valve is connecting safety valve to condenser
(evaporator). The ball valve maintain full-state, it is closed only when safety valve is opening or replaced.
