OKTOP® Cooling Tower

Benchmarking cooling towers

Designed for reliability and performance, Metso’s OKTOP® Cooling Tower combines proven technology with a compact, high-capacity layout, effortless maintenance, and rapid installation to deliver maximum value with minimal complexity.

Proven low-emission technology based on established design

Superior cooling performance with smallest footprint in the market

The world’s first self-cleaning Cooling Tower, delivering the longest uptime in the industry

Shortest time from sales to start-up

Redefining cooling performance

Metso OKTOP® Cooling Tower delivers high cooling performance with low environmental impact. Its patented horizontal outflow system ensures superior efficiency and significantly reduces emissions compared to traditional vertical-flow designs - making it a smarter, more sustainable choice.

Built from durable fiber-reinforced plastic (FRP) and high-grade stainless steel, these towers withstand harsh, acidic environments. With optional anti-scaling curtains and sizes of 2, 4, and 6 meters in diameter, they fit a wide range of process needs while maintaining proven reliability and environmental benefits.

Why choose 3rd generation OKTOP Cooling Towers?

~70% Smaller footprint - ~50% civil worksweight reduction

Reducing top structure diameter from 10 to 6-meter leads to smaller footprint and allows a tighter layout

Self-cleaning technology

Equipped with automatized cleaning spray nozzles, ensuring the longest operational intervals in the market

Reduced equipment logistic costs

The old design required 8 x 40-foot containers per tower, while the new design requires 6 x 40-foot containers per tower. Possibility to deliver equipment as complete to sites

Significantly reduced equipment installation hours on-site

The simpler structure and higher rate of pre-fabrication in the workshop reduce installation hours by 25 – 95% depending on installation scope and design

Benchmarking Cooling Towers

Metso has developed the 3rd generation OKTOP® Cooling Towers to address key customer challenges in demanding industrial environments. This new OKTOP® Cooling Tower builds on a well-established foundation, utilizing the same horizontal outflow demister ideology as the previous design.

The OKTOP® Cooling Tower is designed for maximum efficiency within a minimal footprint. Its compact layout allows for a one-to-one replacement of conventional cooling towers while doubling cooling capacity. With a foundation design that requires minimal construction and a low overall footprint, this solution delivers high capacity without compromising space or performance.

Designed with uptime and simplicity in mind, the OKTOP® Cooling Tower features advanced self-cleaning technology and maintenance-driven solutions.

3rd generation: main features

Highly compact structure ideal for brownfield installations
Designed to minimize downtime and maintenance costs
Simplified transport and on-site assembly to reduce capital expenses
Prevents recirculation of warm off-gas, ensuring optimal cooling efficiency and improved overall performance
Incorporates horizontal outflow technology which ensures low emissions, reinforcing reliability, and environmental compliance

Self-cleaning technology

The new 3rd generation Cooling Tower enables advanced cleaning methods for improved reliability
World’s first self-cleaning cooling tower (patent pending)
Retractable central cleaning tool reaches all surfaces below droplet separators
Automatic valve protection keeps cleaning nozzles secure during operation
Eliminates need for anti-scaling curtain (optional if required)
Dedicated spray nozzles allow interval cleaning of each droplet separator

Sustainable cooling solution

Metso OKTOP® Cooling Tower provides efficient and sustainable cooling, controls emissions effectively and uses innovative maintenance procedures. The heart of OKTOP® Cooling Towers lies in their patented horizontal outflow system. This innovative design ensures efficient cooling while minimizing emissions. Compared to conventional vertical-flow demisters, the horizontal-flow demisters significantly reduce environmental impact.

Operation

Efficient cooling for versatile applications

Metso OKTOP® Cooling Towers are designed for cooling materials with high sulfuric acid, chloride, fluoride and gypsum content. The solution is fed from the top, with cooling air flowing upwards, generated by a fan at the bottom. The cooled solution is collected and fed to the next process phase.

These towers are ideal for cooling spent electrolytes in zinc electrowinning, gypsum and chloride removal in zinc refineries, and cooling solutions in gold autoclave circuits. They offer significant savings through reduced maintenance and increased uptime.

Robust design and easy maintenance

The OKTOP® Cooling Towers are available in three sizes: 2, 4 and 6 meters in diameter. Manufactured from fiber-reinforced plastic (FRP) and high-grade stainless steel, these cooling towers are acid-resistant and structurally strong.

OKTOP® Cooling Towers replace conventional cooling towers, increasing feed rates to electrolysis and maintaining lower outlet temperatures. They optimize performance and set industry benchmarks. With larger air throughput per demister area, OKTOP® Cooling Towers offer the same cooling power with less equipment, reducing investment and operating costs. Maintenance is simplified with accessible top platforms, easy demister cassette removal, and no need for scaffolding.

Metso’s unique maintenance approach allows for online demister maintenance, ensuring stable cooling performance. Nozzle maintenance is quick and easy, and the towers feature a curtain to prevent gypsum precipitation.

2nd generation: main features

Horizontal demister technology delivers approximately double airflow and cooling capacity compared to conventional towers
With the top section being relatively large, fewer cooling towers are required
Emissions minimized to 0.0002% - five times lower than conventional designs orindustry benchmarks
Easier maintenance with service platform sand internal access to demister boxes, improving availability
Maintenance can be done without internal scaffolding either from top platform or inside the demister compartments
Internal PVC curtain for anti-scaling purposes
Easier maintenance with service platformsand internal access to demister boxes,improving availability