Flooded type water cooled screw chiller (MIC)
MCAC-CTSM-2018-1
20
6.2 Pressure vessels
6.2.1 General
Monitoring during operation, re-qualification, re-testing and re-testing dispensation:
Follow the regulations for monitoring pressurized equipment.
The user or operator should set up and maintain 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 from corrosion. 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 may cause wear or corrosion by puncturing.
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 repairs or modification, including the replacement of moving parts:
Must follow local regulations and be performed by qualified operators in accordance with authorized
procedures, including changing the heat exchanger tubes.
Must be made in accordance with the instructions of the original manufacturer. Repairs and
modifications that necessitate permanent assembly (soldering, welding, expanding etc.) must be
performed under the correct procedures and by qualified operators.
Any modification or repairs must be recorded 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 using high-quality
materials.
6.2.5 Security
The unit is equipped with safety valves. A ball valve connects the safety valve to condenser (evaporator).
The ball valve maintains full-state. It is closed only when the safety valve is open or replaced.
