EN - 8
- Record all periodic checks carried out and problems encountered in the maintenance log.
Short-term interruption (< 3 months)
1) Gradually lower the pressure in each circuit.
2) Turn off the pumps and close the shut-off valves, starting with the hot circuit and then the cold circuit.
3) Let the heat exchanger cool to room temperature.
4) Completely drain the heat exchanger and close the drain cocks.
Long-term interruption (> 3 months)
Carry out the above steps as well as the following:
1) Flush the heat exchanger circuits with water to remove all residues.
2) Loosen the nuts on the tie-rods to reduce the compression on the gaskets.
3) Apply a rust preventive on the tie-rods.
4) When recommissioning the heat exchanger, lubricate the tie-rods and runners; see section 4.1.
5) Retighten the plates to the dimension shown on the data plate.
5.2 - Disassembly
- Breaking the special quality strap around the heat exchanger will void the warranty. You must obtain CIAT’s written permission
in order to remove the strap.
- Store the plates on a flat, clean surface away from ferrous particles and dirt.
- For easier reassembly, stack the plates in the order of assembly or number them.
Procedure:
1) Disconnect the pipes at the back of the frame (multi-circuit units).
2) Clean and lubricate the tie-rods.
3) Measure the tightening dimension.
4) Loosen all the nuts in the order shown in Figure 10. Pull back the movable follower and carefully remove the plates one by one
so as not to damage them. Wear protective gloves while doing so as the edges of the plates are sharp.
5) Remove the gaskets by lifting the tabs out of their slots on the edges of the plates.
6) Clean the heat exchanger.
- Separate the plates with care, paying particular attention to the fastening of the Plug-In® gaskets; the gaskets tend to stick to
the plates after a period of prolonged operation at high temperatures. Gaskets that retain their original properties may be reused.
- Never mix new and old gaskets as the difference in elasticity will result in overcompression of the new gaskets and reduce their
service life.
5.3 - Manual cleaning
- Always wear safety glasses and protective gloves and follow the instructions for the cleaning products used.
- Dispose of wastewater in accordance with prevailing environmental protection regulations.
- Never use metal tools, abrasives, or corrosives.
- Use a soft, non-metallic brush and suitable detergent.
- A pressure washer may be used provided the necessary precautions are taken to avoid damaging the gaskets.
- Soak the plates in a detergent solution if they are coated with thick deposits.
- Thoroughly rinse the plates, and especially the gaskets, in cold or lukewarm water.
- Degrease the plates before reinstalling them, especially if one of the fluids circulated is a lubricant (e.g. oil).
- Carefully check the gasket surfaces and the condition of the gaskets.
5.4 - Cleaning in place (CIP)
- CIP is recommended if the heat exchanger requires frequent cleaning or is hard to disassemble.
- When using this method it is extremely important that there is no particle build up during the exchange. Likewise, if there is a
risk of the surfaces of the plates being damaged by particles, manual cleaning is preferred.
- The CIP procedure must be determined with a specialised firm when the system is designed.
- After the first few cleanings, it may be necessary to open the heat exchanger in order to check the degree of cleanliness, adjust
the cycle time and determine the best product concentrations.
Summary of Contents for ITEX NA 10.51 D
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