Field mounted high flow cooling towers – PU / RM / OC series

Process industry

Open Circuit, Field Erected High Flow Cooling Towers

The field erected cooling towers are designed for large industrial plants and are suitable for high flow rates (500-10,000 m3/h).

The equipment is designed according to the characteristics of each project and customer and all models are composed of modules and components pre-assembled in our factory and then assembled on site.

These cooling systems are constructed of various materials, including concrete, steel and fiberglass. They are designed to be efficient and use minimal energy. The design of open circuit cooling towers ensures fast and economical installation and offers the possibility of retrofitting into existing structures. Open circuit cooling towers are efficient and use as little energy as possible.

High-flow cooling towers are designed for process cooling in a wide range of applications, including the power, chemical, petrochemical and paper industries.

Technical data

  • Axial motor-fan with gearbox reducer, low installed power, low noise levels. Motors with IP56 protection.
  • FRP segment fan stack, designed to optimize fan performance, reducing energy consumption. Galvanized steel frame to support the entire fan group, the motor, the drive shaft and the gearbox. 
    High efficiency DRIFT ELIMINATORS certified by EUROVENT. They consist of PP sheets of three vacuum thermoformed folds and welded together to form panels that guarantee maximum drop separation efficiency of the air flow extracted by the fan.
  • Water distribution system composed of PN 10 pipes and complete connectors with flanged connection.
  • Fill pack (or heat exchange surface) consisting of PVC or PP sheets, vacuum thermoformed and welded together (air / water channels of different types suitable for cooling different types of water). The shape and size of the padding optimize the contact between air and water and, therefore, the heat transfer process.
  • Lower support structure composed of galvanized steel profiles, designed to be installed in a concrete water tank.
  • Air inlet louvers made of FRP, designed to fit the lower structure mentioned above.
  • Load bearing structure in hot galvanized steel of high thickness (galvanization process according to UNI EN ISO 1461-99, thickness not less than 80 microns).
  • Casing composed of 22 thick polyester resin sandwich panels. Reinforced with fiberglass with isophthalic resin for protection against UV rays.
  • Spealing between the supporting structure and the panels is guaranteed by special bituminous sealing gasket.
  • Perimeter frame with fill pack support in hot galvanized steel of high thickness (galvanization process accordance with UNI EN ISO 1461-99 standard, thickness not less than 80 microns). It is located and fixed to the base of the cooling tower body forming a sturdy structure.
  • Fan deck completely made of non-slip galvanized metal, in accordance with safety regulations.

  • Nuts and bolts in stainless steel AISI 304.

  • Axial fan system with transmission shaft.

  • Induced draft cooling towers

All models are available in the following special versions:

  • ATT: for high temperature water, with max peaks of 80°C
  • N: for water containing low quantities of suspended solids
  • N-ATT: for high temperature water (with max peaks of 80°C containing low quantities of suspended solids.
  • GS: for water containing large quantities of suspended solid
  • SILENT: different technical solutions to reduce noise

PMM series cooling towers allow the design of various solutions according to customer demands and various critical system problems:

  • Adaptation to existing tanks or structures (replacement of other cooling towers).
  • Limited available space.
  • Short plant shutdown to replace existing towers.
  • Short assembly time with limited use of manpower for final installation.
  • Reduced time from order confirmation to start-up.
  • Easy, fast and safe access to internal parts: ordinary and extraordinary maintenance operations are greatly simplified.
  • Transport of pre-assembled modules and components on standard vehicles.
  • Limited use of cranes or forklifts for final assembly.
  • Energy savings (axial fans, low rpm).
  • Multiple solutions to reduce noise levels.
  • Cooling of different types of water.
  • Maximum operational flexibility to optimize the system according to different loads and environmental conditions.

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    FREQUENTLY ASKED QUESTIONS
    ABOUT FIELD-MOUNTED HIGH-FLOW COOLING TOWERS

    Effective project planning requires site visits to get to know the workspaces, evaluate possible crane maneuvers, and identify obstacles that may be encountered. In addition, it is important to conduct inspections at the supplier to eliminate assembly errors and to verify materials well in advance of the start of the work, ensuring that nothing is missing during the assembly phase. To keep the project on budget and on schedule, it is essential to implement strategies such as soliciting bids from suppliers for critical items in the bid phase, making a good estimate of all items needed for project execution, and properly tracking purchase orders. It is also key to negotiate with suppliers during the bidding phase and avoid surprises on site that can lead to improvised purchases. Good planning, along with weekly reviews of project progress and regular site visits by a project manager, contribute significantly to ensuring that all stages are carried out effectively and according to plan. Finally, it is critical to adhere to the client’s design standards, especially with regard to stairways, as deviating from these standards can result in significant time losses due to the need to justify designs before client-imposed specifications are executed.

    • Meet the customer’s expectations in terms of cooling, production standards and delivery times.
    • Fit the tower in the space the customer has reserved for it.
    • Comply with the deadlines indicated by the customer
    • Maintain the sales margin at the end of the project.

    The water temperature influences the choice of the material to be used in the filling; for example, PVC is suitable for temperatures around 65°C, while polypropylene (PP) is used at temperatures close to 85°C, also considering temperatures below freezing. In addition, water quality has a direct impact on material selection. On the other hand, it is important to take into account the estimated life of the tower: concrete towers usually have a longer service life than steel towers, although the lead times for concrete civil works are generally longer.

    The design of large square cooling towers has to comply with the CTI standard. This is the most common standard for tower performance testing and is accepted in all countries where Torraval operates.

    The process starts with the 3D design of the cooling tower and the manufacturing review before proceeding to the purchase of materials. This is followed by the fabrication of the required components. In addition, it is crucial to maintain good coordination in the delivery of the goods, especially for those shipments coming from abroad, such as from India, Turkey, Germany or Italy.

    The risks associated with the construction of a field-assembled gantry tower are connected with improvisation in the project. To minimize errors, good planning of shutdown dates is recommended, which helps to ensure that each stage is executed effectively and efficiently.

    To guarantee the success of the project and ensure quality at all stages, from design to installation and commissioning, it is essential to carry out periodic inspections of the assembly by the project manager. In addition, it is essential to use adequate machinery for the required movements, sparing no expense, and even consider the duplication of this machinery at specific times to maximize operations. Finally, working with subcontractors that meet the requirements of the project is also key to maintaining the quality and success of the project.

    Service and customer care

    for cooling equipments

    Technical inspections

    Global inspection of refrigeration equipment for a good diagnosis.

    Cleaning and desinfectation

    To maintain hygienic sanitary safety of the cooling unit.

    Security in access

    Protections and platforms for safe work in cooling towers.

    Revamping & Retrofitting

    Consultants specialized in reforms and improvements in cooling towers with the aim of adapting them to the new working conditions.

    Preventive maintenance

    Preventive maintenance to obtain
    the original design performance of the refrigeration equipment.

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