Bypass filtration of cooling systems

Bypass filtration of cooling systems

Cooling systems equipped with fan coolers, cooling towers, or other devices where the cooling water is in direct contact with air, are all prone to accumulation of pollution from its immediate surroundings. The pollution can have various forms, e.g. mineral substances (sand), organic substances (pollen, leaves, soil particles) or chemicals (cement, ash). In addition, substances generated in the system itself can accumulate in the circuit, such as the products of corrosion or mineral residue.

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Description

Accumulation of the the aforementioned substances leads to a lot of undesirable effects, such as:

* Accumulation of sediments on surfaces exchanging heat, such as plates and pipes of heat exchangers,
* Increase in corrosion processes, as a result of subdeposit corrosion, usually pitting corrosion,
* Increase in microbiological activity, including the formation of sludge or development of dangerous bacteria, such as Legionella spp. , and others.

These phenomena lead to increased operating costs of circulation, as a result of lower quality of heat exchange, need for additional maintenance shutdowns and repairs, and increased consumption of chemicals used for water treatment.

Sludge accumulating in a cooler

The primary method of counteracting these phenomena is bypass filtration of the circulating water. Constant filtration of as little as 2-5% of the water stream in circulation allows for effective reduction of the accumulating sediments. (In specific cases it’s recommended to filter up to 10% of the stream). Taking into consideration both investment and operating costs, the most efficient bypass filtration technology is disk filtration.

This is due to:

* Filters are manufactured from specialized plastic material, highly resistant to pressure, temperature and chemical exposure,
* Filters having a high efficiency relative to the installation footprint, combined with the simplicity of their design,
* Filters having the lowest ratio of backwash water consumption relative to the volume of the filtered water produced.

Bypass filter using disk technology

AZUD disk filters offered by MCC have two additional advantages, that distinguish them from competing solutions:

* The patented Azud Helix system, which utilizes centrifugal force to extend the intervals between backwash cycles, by preventing the larger particles from reaching the filtrating element,
* The largest filtration module surface area on the market, up to 1620cm<sup>2</sup> , enabling a higher flow capacity with a more compact unit size.


Comparison in water usage efficiency for different filtration methods.

In certain applications, the use of conventional filtration based on a mineral filter media is required. MCC also offers such solutions, ensuring the reduction of excessive iron concentrations in circulating water, both in open and closed systems.


Bypass sand filter

MCC’s specialists will provide professional help in selection of the technology best suited for the situation, and our service department will deliver, install and comission the device.
Explore our bypass filter solutions

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