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Product FAQs

• Can the air pre-charge pressure of CIMM expansion vessels be modified?

  Yes, it is possible to modify the air pre-charge pressure of CIMM expansion vessels with cautions. We suggest to ask to an expert and authorized personnel to carry out the operation. Being aware of the specific features of the system or plant where the vessel has to be or is installed, the pre-charge pressure of an empty CIMM vessel can be increased up to a maximum of 3.5 bar and can be reduced to a minimum of 0.5 bar.

• How can you check if the internal membrane of an expansion vessel is broken?

  All CIMM expansion vessels with membrane are pre-charged with air through an air valve. The rubber membrane inside the vessel keeps the water separated from the air. Therefore, in case of malfunction, to check if the membrane of the vessel is broken, you must act on the internal mechanism of the air valve, pressing it with a tool such as a screwdriver, and checking what comes out. If water leaks, it means the membrane is broken and the water has completely filled the vessel. Whereas, if air comes out, the membrane should still be intact and it is necessary to simply pre-charge the expansion vessel again to make it work. Download the instructions to know how to change the membrane of an expansion vessel with interchangeable membrane.

• How to avoid damages and malfunctions in expansion vessels and guarantee longevity to the installed product.

  To avoid breakages and malfunctions, first consult the special label affixed to the expansion vessel and the instruction manual supplied by the manufacturer. Furthermore, it is necessary to:  

  1. Perform a correct and periodic maintenance of the system in which the expansion vessel is installed
  2. Periodically check the pre-charge pressure of the vessel and if necessary restore it to the value indicated on the label
  3. Check the correct grounding of the system, in order to avoid galvanic currents
  4. Check the correct sizing of the expansion vessel
  5. Pay attention to excessive overpressure and water hammering phenomena in the system
  6. Avoid to install the expansion vessel in unsuitable environments or areas subjected to particularly aggressive climatic conditions
  7. Avoid the formation of condensation that leads to the development of corrosive phenomena (see question 13)
  8. Monitor the pH value of solutions containing glycols or other substances
  9. Avoid mixing different antifreeze products

• Is it necessary to check the air pre-charge pressure of the expansion vessels?

  Yes, as written in the instruction manual, it is necessary to periodically check - at least once a year - the air pre-charge pressure of the expansion vessels, and if necessary charge them again to the value indicated on the label, to guarantee the correct functioning of the vessels in the plant.

• What information is required and how do you size CIMM expansion vessels?

  Depending on the type of use (for boilers, heating systems, domestic hot water systems, hot and cold water systems, solar energy systems) it is possible to size the expansion vessel by consulting the CIMM CALCULATOR SOFTWARE FOR DIMENSIONING OF CIMM PRODUCTS at this link. For more information, contact our technical department.