FAS / FASF series, FAS / FASF series, designed for maximum corrosion resistance, offers open circuit cooling towers, with a wide range of thermal potentials from hundreds of kW to very respectable sizes over 10 MW. All models apply a modular concept and are fully factory pre-assembled to minimize on-site installation costs. Fan groups are characterized by large dimensions and are assembled on site. Each model can be customized with dimensions and characteristics based on project needs and in order to respect environmental constraints with reduced acoustic and energy impact. Regarding this, special executions are provided for ATEX environments (“EX” versions), for low temperature environments (“SN” versions), for low noise emissions (“LN” version) and with energy optimization systems (“VDI version”).
This series is used in all sectors in civil and industrial field in presence of corrosive environments (for metallurgy and beyond) with excellent results, thus being able to avoid the use of expensive materials such as stainless steel for structures. The main features of these open circuit evaporative towers are the following:
STRUCTURE / MONOLITHIC ENCLOSURE (body, fan stack and collection basin).
The tower structure is characterized by profiles made of hot-dip galvanized steel in accordance with UNI EN ISO 1461: 1999. The panels on the sides are a “sandwich” 22 mm thick, with a core in polyurethane foam covered with fiberglass sheets (FRP fiberglass).
The fan stacks are usually in reinforced fiberglass with UV treatment composed in sectors to be flanged together with stainless steel bolts. Each diffuser has a circular and conical inlet fitting, the outlet section diverges to obtain a “venturi” effect on the air flow with a reduction in the power absorbed by the engine, improving the overall efficiency of the machines. Each fan stacks is equipped with an inspection panel to facilitate maintenance of the ventilation unit and is fixed to the tower structure by means of dedicated bolts that secure it to the galvanized steel walkway of the cooling tower.
The tower body, made of several pre-assembled modules placed one next to the other, can be fully inspected thanks to the inspection doors and removable FRP walls (for each cell), allowing the operator an easy entry.
An important feature for FASF towers is the presence of a particular coating called “SCAM / SHIELD”, consisting of a FRP sheet fixed with stainless steel bolts along the internal structural walls, wrapping the dispersion elements. In this way, the internal metal structure is completely isolated from the process water, and the phenomenon called “by-pass on wall” is also reduced. With the expression “by-pass on wall” we mean the water that, being nebulized on the internal walls of the tower, does not meet the air rising in against the current, (with consequent loss of efficiency). The perfect internal and external insulation therefore allows the meticulous elimination of any water leaks from the walls of the tower.
The collection basin, complete with all necessary connections for normal use, can be made on request in a weight-saving “self-draining” EU version in line with current European anti-legionella guidelines. The basin is supplied with a pre-assembled structure consisting of welded metal sheet panels protected with our hybrid protective cycle “SCAMBOND / HYB”, a high thickness hybrid treatment performed on carpentry consisting of a first layer of galvanizing on Sa3 sandblasted surfaces ISO8501-1, plus a specific bi-component epoxy-polyamine cycle, then applying a subsequent two-component aliphaticpolyurethane type. On the internal surfaces of the basin in the FASF series only, the diversified protective coating DURABOND / HYB is used: an evolution for aggressive environments consisting of a two-component epoxy-polyamide cycle preparatory to the subsequent FRP resin coating with the deposition of 2 hand-applied layers of glass fiber 450 g / m2 and a finish with epoxy / polyester resin (overall thickness 1500 g / m2).