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Materials of Construction

  • Standard Construction — G-235 mill galvanized steel is the heaviest commercially available galvanized steel, universally recognized for its strength and corrosion resistance. To assure long life, G-235 mill galvanized steel panels and structural members are used as the standard material of construction. BAC units are certified to withstand up to an SDS of 3.10g and wind loads of up to 200 psf, proving its construction is designed for extreme durability. With proper maintenance and water treatment, G-235 galvanized steel will provide an excellent service life under the operating conditions normally encountered in comfort cooling and industrial applications
  • TriArmor® Corrosion Protection System (Option) The TriArmor® Corrosion Protection System consists of heavy gauge G-235 galvanized steel panels fully encapsulated by a thermosetting hybrid polymer and further protected by a polyurethane barrier applied to all submerged surfaces of the cold water basin. The triple layers of protection form a completely seamless cold water basin for the most leak resistant and durable basin in the industry. Other components within the basin, such as the strainer and submerged structural supports, will be constructed of Type 304 stainless steel. The TriArmor®Corrosion Protection System was specifically designed for evaporative cooling applications and released in 2006 after a decade of extensive R&D and field testing. To date, there are over 1,000 successful installations in North America. Every cold water basin is leak tested at the factory and warranted against leaks and corrosion for five years.

    TriArmor® Corrosion Protection System Triple Layer Protection of the Cold Water Basin

    TriArmor® Corrosion Protection System Triple Layer Protection of the Cold Water Basin

  • EVERTOUGH™ Construction (Option) EVERTOUGH™ Construction combines the most corrosion resistant materials to provide the best value in corrosion protection for most water chemistries. EVERTOUGH™ Construction is backed by a comprehensive Louver-to-LouverSM 5-year warranty which covers ALL components from the fan to the cold water basin, from Louver-to-LouverSM, including the motor.
    • The following materials are used in EVERTOUGH™ Construction:
      • The cold water basin is constructed with the TriArmor® Corrosion Protection System.
      • Designated steel components above the cold water basin are constructed of heavy-gauge G-235 galvanized steel and further protected with a thermosetting hybrid polymer.
      • The distribution system is non-corrosive Schedule 40 PVC.
      • Other components within the cold water basin, such as the strainer, will be constructed of Type 304 stainless steel.
  • Thermosetting Hybrid Polymer (Option) A thermosetting hybrid polymer, used to extend equipment life, is applied to select G-235 mill galvanized steel components of the unit. The polymerized coating is baked onto the G-235 mill galvanized steel and creates a barrier to the already corrosion resistant galvanized steel. The thermosetting hybrid polymer has been tested to withstand 6,000 hours in a 5% salt spray without blistering, chipping, or loosing adhesion.
  • Stainless Steel (Option)

    • Welded Type 304 Stainless Steel Cold Water Basin All steel panels and structural members of the cold water basin are constructed from Type 304 stainless steel. Seams between panels inside the basin are welded, providing an advantage over bolted stainless steel basins for minimizing susceptibility to leaks at basin seams. The basin is leak tested at the factory and welded seams are provided with a 5-year, leak-proof warranty.
    • All Type 304 Stainless Steel Construction Steel panels and structural elements are constructed of Type 304 stainless steel. Seams between panels inside the cold water basin are welded. The basin is leak tested at the factory and welded seams are provided with a 5-year, leak-proof warranty.
  • Seismic/Wind Upgraded Structure (Option) — Select steel panels and structural members are upgraded for higher seismic and wind load applications. An upgraded PF2 unit is certified to withstand up to an SDS of 3.75g and wind loads of up to 200 psf. All BAC upgraded units are shake table tested by an independent laboratory to certify the most accurate seismic ratings, ensuring that the unit will remain operable following a seismic event.

OptiCoil System

The patent pending OptiCoil System combines indirect and direct heat transfer sections arranged to maximize thermal performance. The OptiCoil System consists of standard serpentine coil with BAC Pak™ Fill inserted within the coil structure, engineered for easy access. To read a white paper on “Thermal Performance For Different Evaporative Coil Technologies Over the Product Life,” click here.

OptiCoil™ System

OptiCoil™ System

Coil Configurations

  • Standard Serpentine Coil —The standard coil is constructed of continuous lengths of all prime surface steel. The coil is hot-dip galvanized after fabrication (HDGAF) to apply a thick, zinc corrosion barrier over the entire exterior surface of the coil. The coil is designed for low pressure drop with sloping tubes for free drainage of fluid. Each coil is pneumatically tested at 375 psig (2,586 kPA) and is fabricated per ASME B31.5 standards to ensure the highest quality and complete integrity.
  • Cleanable Header Coil (Option) — The cleanable header tube bundle provides removable cover plateson the inlet and outlet header boxes to permit access to each serpentine tube circuit for solvent or air-pressure cleaning. Tubes are all prime surface steel tubing formed into a serpentine shape and welded into an assembly. Coil material options include carbon steel coils (hot-dip galvanized outside surface). Each coil is pneumatically tested at 125 psig (860 kPa).
  • Stainless Steel Coil (Option) Coils are available in Type 304 stainless steel for specialized applications. The coil is designed for low pressure drop with sloping tubes for free drainage of fluid. Each coil is pneumatically tested at 375 psig (2,586 kPa) and is fabricated per ASME B31.5 standards to ensure the highest quality and integrity.

    Stainless Steel Coil Construction

    Stainless Steel Coil Construction

  • Straight-Through Cleanable Coil (Option) header box with a removable cover plate at each end of the coil allows access to every tube end for mechanical cleaning or plugging. It is available in carbon steel (hot-dip galvanized inside and out). Each coil is pneumatically tested at 125 psig (860 kPa).
  • ASME U Designator Coil (Option) — BAC offers coils that are certified in accordance with the ASME Boiler and Pressure Vessel Code, Section VIII, Division I. ASME U designated coils are available for projects requiring ASME certified pressure vessels and involve 3rd party inspection and certification. Standard ASME U designated coils are rated at 340 psig (2,344 kPa) maximum allowable working pressure, and they are pneumatically tested at 375 psig (2,586 kPa).
  • Multiple Circuit Coil (Option) Split coil configurations are available to allow separate process fluid loops through the same unit. Separate loops may be needed for multiple applications requiring different temperature processes or multiple types of process fluids.
  • Note: A Canadian Registration Number (CRN) is required for all pressure vessels over 15 psig entering Canada. The CRN identifies that the design of a boiler, pressure vessel, or fitting has been accepted and registered for use in Canada.


The BAC Pak™ Fill is exclusively designed to provide you guaranteed thermal performance and is made of PVC making it virtually impervious to rot, decay, and biological attack. The fill can be used in applications with entering water temperature up to 140˚F (60˚C). The fill and drift eliminators are formed from self-extinguishing PVC that meets CTI Standard 136 for flammability, strength, and impact testing.

Drive System Options

  • Standard Independent Direct Drive Motors (Standard on PFi-0406 and PFi-0412) — The direct drive dual motor system with TEAO motors is factory mounted, alleviating the need for field installation and includes independent fans and motors for capacity control and redundancy in critical applications. Direct drive systems have the benefit of simplicity by having fewer moving parts, which reduces maintenance requirements and friction losses within the drive system.
  • Standard BALTIDRIVE® Power Train (Standard on All Models Except PFi-0406 and PFi-0412) — The BALTIDRIVE® Power Train utilizes special corrosion resistant materials of construction and state-of-the-art technology to ensure ease of maintenance and reliable year-round performance. This BAC engineered drive system consists of a specially designed powerband and two cast aluminum sheaves located at minimal shaft centerline distances to maximize belt life. When compared to a gear drive system, this specially engineered belt drive system provides many advantages. The BALTIDRIVE® Power Train requires only periodic inspection of components and belt tensioning, which is simple with a single nut adjustment and requires less downtime. Only fan bearing lubrication is required for routine maintenance. Belt drive systems also have the added advantage of being suitable for variable frequency drive (VFD) applications without requiring expensive optional accessories.

    BALTIDRIVE® Power Train Fan System

  • Independent Fan Operation (Option on PFi-1218 and PFi-1236) Two fan PFi-1218 and PFi-1236 models are available for added redundancy and capacity control. The two fan drive system consists of one fan motor and drive assembly for each fan to allow independent operation, adding an additional step of fan cycling for capacity control. Each fan and motor combination is supplied with the BALTIDRIVE® Power Train fan drive system and includes all the same benefits of the one fan BALTIDRIVE® Power Train (see the previous description) with the added capability of redundancy.
  • Standard Extended Lubrication Lines Extended lubrication lines are available for lubrication of the fan shaft bearings. Fittings are located on the exterior casing panel next to the access door.

OptiSpray™ Water Distribution System

BAC provides the lowest spray water pump HP in the industry for closed circuit cooling tower products, keeping operating costs as low as possible. BAC has optimized the spray water coverage over the coil in order to maximize capacity.

Annual Spray Pump Energy Cost for BAC & Competition

Annual Spray Pump Energy Cost for BAC & Competition

  • Standard Spray Water Pump The PFi water distribution system comes standard with an integral spray water pump sized to distribute the recirculating water over the coil, maximizing capacity. The patented BAC 360™ Spray Nozzles are non-clog to ensure even flow over the coil area and are grommeted for easy removal. BAC’s exclusive OptiSpray™ Technology can save you over $2,000 in annual operating costs.

Shipping and Rigging

  • Standard Rigging Guides — Rigging guides allow for the upper and lower section of the units to perfectly align and engage. The self-guiding pins ensure proper placement of the upper section and lower section, making rigging much simpler, reducing installation time.

    Rigging Guides

    Rigging Guides

  • Knockdown Units (Option) Knockdown units are available for jobs where access to the tower location is limited by elevators, doorways, or similar obstacles, where lifting methods impose very strict weight limits, or where the shipping cost of a fully assembled unit is excessive. All materials of construction and design features are the same as those of a factory assembled unit. Welded Type 304 stainless steel cold water basins and TriArmor® Corrosion Protection System basins are excluded due to the need for in-plant assembly.
  • Containerized Units (Option) The PFi-0406, PFi-0412, PFi-0709, and PFi-0718 can be containerized in a standard shipping container for easy export, allowing for the lowest transportation cost possible when providing high quality BAC units to all parts of the world.

Sound Options

  • Standard Fan — The fan provided for all PF2 Closed Circuit Cooling Towers is selected to optimize low sound levels and maximize thermal performance. Thermal performance with the Standard Fan has been certified in accordance with CTI Standard STD-201.
  • Low Sound Fan (Option) The Low Sound Fan option reduces sound up to 8 dBA. Adding a high solidity fan allows for decreased fan speed, which proportionally decreases sound levels. Thermal performance with the Low Sound Fan has been certified in accordance with CTI Standard STD-201.
  • Whisper Quiet Fan (Option) — The Whisper Quiet Fan reduces sound up to 15 dBA. This single piece, high solidity fan is made from chemical resistant fiber reinforced polyester (FRP) and comes standard with blade leading protection. As a single piece fan, the non-corrosive blades are permanently pitched and require minimal maintenance. Thermal performance with the Whisper Quiet Fan has been certified in accordance with CTI Standard STD-201.
  • Water Silencers (Option) — Water silencers are available to reduce the sound of falling water inherent in induced draft counterflow evaporative condensers. When utilized with any one of BAC’s low sound fan options, the sound contribution due to water noise can be reduced to negligible levels. Thermal performance with the water silencers has been certified in accordance with CTI Standard STD-201.
  • Discharge Sound Attenuation (Option) — Factory designed, tested, and rated sound attenuation options are available on the air discharge for models PFi-0406 and PFi-0412. Thermal performance with the discharge attenuation has been certified in accordance with CTI Standard STD-201.

Air Intake

  • Combined Inlet Shields The combined inlet shields’ (CIS) bent flow path blocks sunlight from the cold water basin and acts as a screen to prevent debris from entering the unit. These benefits result in a significant reduction in algae growth, debris accumulation, and scale build-up. CIS are constructed from corrosion and UV resistant PVC and are installed in easy to handle sections to facilitate removal, inspection, and replacement. The use of CIS results in lower maintenance costs and ease of maintenance over the life of the unit.

    Combined Inlet Shields

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