Cooling Tower

Corrosion & Scale Prevention

This is a comprehensive treatment program for common issues found in cooling tower components such as corrosion, scale deposition, fouling and biological growth. Since dangerous pathogens can propagate in cooling towers, we focus on the safety of both the system and the building occupants.

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Clean & Efficient Cooling

The Cooling Tower Treatment Program is a service comprised of site testing services, e-Service Reporting, and field-proven products to effectively inhibit scale deposition, corrosion, fouling and biological growth to economically improve operations in cooling water systems.

Cooling water systems are used in many industrial plant operations, institutional facilities and commercial/residential buildings to provide comfort and air conditioning. Systems such as cooling towers, evaporative condensers and fluid coolers remove heat by means of evaporation of the recirculating water.

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Cooling Tower Corrosion

Water causes system component metallurgy to corrode over time, including in the tower basin, transfer piping, heat exchangers and condenser/chiller tubes. The foundation of the Cooling Tower Treatment Program is the use of proprietary corrosion inhibitors to stop deterioration of these system components.

Oxygen Pitting

The continual addition of oxygenated “makeup water” to the circulation system can cause pitting corrosion. These highly localized holes can rapidly penetrate metal piping inwards while the rest of the surface remains intact.

Galvanic Corrosion

Commonly seen where copper condenser tubes come in contact with the ferrous iron endplate, the different metals naturally generate an electric current leading to corrosion.

Concentration Cell Corrosion

Deposits of foreign matter, dirt, organic matter, scale, or any substance on a metal surface can initiate a localized corrosion reaction.

White Rust Corrosion

Low hardness and high pH recirculating waters can promote a white, waxy deposit that is a zinc-rich oxide, that can lead to premature failure of the galvanized coating of the cooling tower component.

Microbiologically Influenced Corrosion (MIC)

Corrosion caused or influenced by microbiological organisms or organic growths on metals.

Biological Fouling

Due to the moisture, nutrient sources, temperature and sunlight exposure, cooling water systems can provide optimum conditions to incubate a variety of life forms such as bacteria, bio-film formation, algae and fungi. The result is biological fouling on the component surfaces, greatly impeding the system operation and cooling efficiency.

The Cooling Tower Treatment Program utilizes regular bacterial testing, biocides and bio-dispersants to inhibit biological fouling.

Scale Deposits

When makeup water containing minerals such as calcium, magnesium, iron and silica are continually cycled to higher concentrations, these minerals will exceed their solubility and precipitate out to form scale deposits on the system components. This results in a loss of cooling transfer efficiency and thermal conductivity, raising energy costs.

Our Cooling Water Treatment Program will provide the most effective scale inhibiting additives and polymers customized for your water quality. Our analytical services will detail the optimal cycles of concentration of the cooling water system to eliminate scale deposition and to conserve water usage.

Pathogenic Bacteria

Legionnaires Diesease is a potentially fatal form of pneumonia and is thought to be transmitted to humans via airborne water deposits. See Pace Solution’s Legionella Risk Management section for more information.

Cooling Tower Cleaning

If your system has a positive test result of legionella or has biofilm growing in the tower, it’s time to clean your system. Pace offers a cooling tower cleaning service designed to make sure your system is clean and safe.

To help promote system cleanliness and disease prevention, Pace Solutions follows the recommendations on industry best practices, ASHRAE 188-2021 and recommendations from the Government of Canada regarding federally operated buildings.

ASHREA 188-2021 recommends that buildings with cooling towers create and maintain a plan for regular inspections of the cooling tower for system cleanliness. It also recommends identifying when remedial and emergency disinfections are required and how they should be performed.

Public Works and Government Services Canada (PWGSC) Document MD 15161 2013 stipulates that any time a tower is started up or shut down for the season a cleaning and disinfection must be performed. The cleaning would include a shock chlorination, or hyperchlorination, at system start up and just prior to shutting down the system for the season.

For more details on hyperchlorination cleaning services for your cooling tower system, check out our Legionella – Cooling Tower Cleaning Brochure, or contact your Pace technical representative (or email us here.)

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Cooling Tower Cannot Provide Sufficient Cooling

The cooling tower on a high-rise commercial building could not meet the cooling demands in the peak of summer due to previous scale deposition on the condenser tubes, raising concerns with maintenance staff over the system efficiency and the life of the equipment.

Revitalizing the Cooling Tower

Pace experts preformed a full assessment and proposed a series of proprietary chemical treatments and service options, including polymers to aid in the removal of the scale deposition over time. It was noted after one cooling season that the mineral scale was diminishing.

Curbing the Cost of Corrosion

By remediating the scale issues and removing some of the existing deposition, the system efficiency was improved to meet the cooling demands during the hot summer months. The result is a lower cost of operation with less maintenance.



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