VTL

1.0 Cooling Tower

1.1 General: Furnish and install _____ factory-assembled, forced-draft, centrifugal fan, counter flow cooling tower(s) with vertical air discharge, conforming in all aspects to the specifications, schedules and as shown on the plans. Overall dimensions shall not exceed approximately _____ mm long x ______ mm wide x _____ mm high. The total connected fan power shall not exceed _____ kW. The cooling tower(s) shall be Baltimore Aircoil Model ____________.

1.2 Thermal Capacity: The cooling tower(s) shall be warranted by the manufacturer to cool _____ l/s of water from ______ °C to _____C at _____°C entering wet-bulb temperature.

1.3 Corrosion Resistant Construction (standard): Unless otherwise noted in this specification, all steel panels and structural members shall be constructed of heavy-gauge hot-dip galvanized steel with all edges given a protective coating of zinc-rich compound and the exterior protected with the BALTIPLUS Protection.

(Alternate 1.3) Corrosion Resistant Construction (optional): Unless otherwise noted in this specification, all steel panels and structural members shall be protected with the BALTIBOND®  Corrosion Protection System. The system shall consist of hot-dip galvanized steel prepared in a four-step (clean, pre-treat, rinse, dry) process with an electrostatically sprayed, thermosetting, hybrid polymer fuse-bonded to the substrate during a thermally activated curing stage and monitored by a 23-step quality assurance program.

(Alternate 1.3)  Corrosion Resistant Construction (optional): Unless otherwise noted in this specification, all steel panels and structural members shall be constructed of Type 304 or 316 stainless steel and assembled with stainless steel nut and bolt fasteners.

1.4 Quality Assurance: The cooling tower manufacturer shall have a Management System certified by an accredited registrar as complying with the requirements of ISO-9001 to ensure consistent quality of products and services.

1.5 Warranty: The manufacturer’s standard equipment warranty shall be for a period of not less than one year from date of startup or eighteen months from date of shipment, whichever occurs first.

2.0 Construction Details

2.1 Structure: The unit shall be constructed of heavy-gauge steel utilizing double-brake flanges for maximum strength and rigidity and reliable sealing of watertight joints. The unit shall be of unitary design to minimize rigging requirements. The fan(s) and fan drive system, including the fan motor, shall be factory mounted and aligned and located in the dry entering air stream to ensure reliable operation and ease of maintenance.

2.2 Heat Transfer Section: The heat transfer sections(s) shall consist of a wet deck surface, spray water distribution system and drift eliminators arranged for optimal thermal performance with minimal drift.

2.3 Wet Deck Surface: The wet deck surface shall be formed from self-extinguishing plastic material and shall be impervious to rot, decay, and fungus or biological attack. The wet deck surface shall be manufactured and performance tested by the cooling tower manufacturer to assure single source responsibility and control of the final product.

2.4 Water Distribution System: Water shall be distributed evenly over the wet deck surface by a water distribution system consisting of a header and spray branches of plastic pipe with large orifice, non-clog plastic distribution nozzles. The branches and spray nozzles shall be held in place by snap-in rubber grommets, allowing quick removal of individual nozzles or complete branches for cleaning or flushing.

2.5 Cold Water Basin: The cold water basin shall be provided with large area lift out strainers with perforated openings sized smaller than the water distribution system nozzles and an anti-vortexing device to prevent air entrainment. The strainer and anti-vortexing device shall be constructed of the same material as the basin to prevent dissimilar metal corrosion. Standard basin accessories shall include a brass make-up valve with large diameter polystyrene filled plastic float for easy adjustment of the operating water level.

(Alternate2.5) Cold Water Basin: The cold water basin shall be constructed of heavy-gauge Type 304 or 316 stainless steel panels and structural members up to the heat transfer section/basin joint. The basin shall be provided with large area lift out strainers with perforated openings sized smaller than the water distribution system nozzles and an anti-vortexing device to prevent air entrainment. The strainer and anti-vortexing device shall be constructed of the same material as the basin to prevent dissimilar metal corrosion. Standard basin accessories shall include a brass make-up valve with large diameter polystyrene filled plastic float for easy adjustment of the operating water level.

3.0 Mechanical Equipment

3.1 Fan(s): Fan(s) shall be dynamically balanced, forwardly curved, centrifugal type selected to provide optimum thermal performance with minimal sound levels. Fan housings shall have curved inlet rings for efficient air entry and four-sided rectangular discharge cowls shall extend into the basin to increase fan efficiency and prevent water from splashing into the fans.

3.2 Bearings: Fan(s) and shaft(s) shall be supported by heavy-duty, self-aligning, relubricatable bearings with cast iron housings, designed for a minimum L10 life of 40 000 hours (280 000 Hr. Average. Life).

3.3 Fan Drive: The fan(s) shall be driven by matched V-belts with taper lock sheaves. Motor shall be located on a heavy-duty motor base, adjustable by a single threaded bolt-and-nut arrangement. Removable steel screens or panels shall protect the fan drive and all moving parts.

3.4 Fan Motor: Furnish _____ kW, ______ RPM Totally Enclosed, Fan Cooled (TEFC), squirrel cage, ball bearing type fan motors suitable for outdoor service. Motor(s) shall be suitable for ________ volt, ___ hertz, and __ phase electrical service.

3.5 BALTIGUARD® Fan System (optional): Two-single speed fan motors, one sized for full speed and load, the other sized for 2/3 speed and approximately 1/3 of full load kW shall be provided in each cell for capacity control and stand-by protection from drive or motor failure. Two-speed motor(s) are not an acceptable alternative.

4.0 Drift Eliminators

4.1 Drift Eliminators: Eliminators shall be constructed of specially formulated plastic material and be removable in easily handled sections. They shall have a minimum of three changes in air direction.

5.0 Access

5.1 Basin Access: Circular access doors shall be provided for easy access to the make-up water assembly and suction strainer for routine maintenance.

6.0 Sound

6.1 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 yourlocal BAC representative.