RCT

1.0 Cooling tower

1.1 General: Supply and install factory assembled cooling tower of counter-flow, induced draft, axial fan design. Each cooling tower shall be guaranteed by the manufacturer to cool ___ litres per second of water from ___ °C (HW) entering water temperature to ___ °C (CW) leaving water temperature at ___ °C (WB) entering wet bulb temperature.

2.0 Construction details

2.1 Structure: The cooling tower structure and casing shall be constructed of high strength Pultruded Composite materials. All pultruded composite components shall be moulded to exacting standards with UV resistant polyester resins such that UV protection is afforded throughout the entire embodiment of the components as well as being an externally applied coating.

2.2. Internal Surfaces: All internal surfaces of the casing, basin, roof deck and fan cylinder shall have an even and regular smooth faced finish resulting from either an open moulding or pultruded moulding process where the faces of these components come into direct contact with the mould to facilitate easy cleaning. Internal flow coated surfaces that have not come in contact with the mould shall not be acceptable.

2.3 Cold Water Basin: The basin shall be constructed of high performance Fibreglass Reinforced Polyester (FRP) and reinforced in critical areas. The basin shall have a smooth internal finish and slope to a center drain for ease of cleaning. All suction, drain, overflow and quick fill connections shall be furnished as standard. The suction connection shall be flanged. Easy and complete access shall be made possible from all sides.

2.4 Air Inlet Louvers: Air Inlet Louvers shall be plastic material, designed to prevent splash out and minimise the passage of sunlight to the cooling tower interior. Louvers shall be easily removable lightweight sections providing easy access for cleaning.

304-grade stainless steel deflector shall be factory fitted at the bottom of and inside the louvers to direct water away from the louver, preventing splash out.

2.5 Wet Deck Surface: The film type fill shall be impervious to rot, decay and fungus or biological attacks.  It shall consist of high efficiency cross-fluted sheets solvent welded into lightweight blocks sized for easy handling and removal for cleaning.

2.6 Water Distribution System: Water shall be distributed evenly over the wet deck surface by a low pressure, stationery, non rotating type water distribution system incorporating heavy duty PVC spray branches and plastic spray nozzles held into place with snap rubber grommets.

2.7 Strainer: The cold water basin strainer shall be a 304-grade stainless steel cylindrical type having a solid top cover plate with a perforated mesh bottom of sufficient open area relative to the suction flow rate and by design, prevent vortexing at the outlet.

2.8 Hardware: All wetted hardware shall be 304-grade stainless steel.

3.0 Mechanical equipment

3.1 Fan: The adjustable pitch axial flow fan(s) shall be of low noise, multi-bladed type heavy duty extruded aluminium. The fan shall operate within a FRP fan cylinder having an even and regular smooth faced internal finish ensuring a streamlined air entry and minimum tip clearance for maximum fan efficiency.

3.2 Motor: The fan motor(s) shall be to IP55 standard with Class F insulation specifically designed for cooling tower service. The fan motor shall be fully outside of the moist discharge air stream for belt driven units. The motor shall be located adjacent to the fan cylinder for ease of access for maintenance and increased motor life expectancy. The motor is to be located below the top of the cooling tower ensuring overall tower height is kept to a minimum and external of discharge ducting in such applications.

3.3 Mechanical Support: The mechanical support shall be of HDG steel construction. The entire mechanical arrangement shall simply bolt to the top of the fan cylinder for ease of access for maintenance. The fan shaft shall be of 304 stainless steel supported by heavy duty, self aligning, grease packed ball bearings specifically suited to vertical shaft application with moisture proof seals and integral slingers. Extended lubrication lines shall be provided as standard to the bearings with grease nipples located outside for ease of scheduled maintenance.

3.4 Belt Drive: Units with belt drive shall be via standard V belts for ease of availability. The motor pulley shall be located outside of the discharge air stream. The entire drive arrangement is to be protected by a hinged cover guard in HDG.

4.0 Drift eliminators

4.1 Drift Eliminators: The plastic drift eliminators shall be UV resistant and impervious to rot, decay and fungus or biological attacks.  They shall consist of high efficiency three pass wave formed blades solvent welded into lightweight, easily removable sections.

5.0 Combined Inlet Shields

5.1. Combined Inlet Shields: Combined inlet shields shall be separate from the wet deck surface and removable to allow easy access for inspection of the air/water interface at the air inlet side of the equipment. Combined inlet shields shall prevent UV-light and debris from entering the unit, as well as prevent water splash out during fan cycling. They shall be constructed of maintenance free, corrosion and UV resistant material.

6.0 Access

6.1 Access: One full side of the casing shall be removable to provide full and open access to all internal tower components for inspection, maintenance and cleaning. The access panel shall be retained by easily removable knobs, not requiring dismantling of the tower structure.

7.0 Sound

7.1 Sound Level: To maintain the quality of the local environment, the maximum sound pressure levels (dB) measured 15 m from the cooling tower operating at full fan speed shall not exceed the sound levels detailed below.

Need more information? Contact your local BAC representative.