/ Marley Class 600 Cooling Tower /
/ Flexibility of Design / Class 600 cooling towers are a direct descendent ® of the Doubleflow crossflow tower that was designed and patented by Marley in 1938. In 1957, Marley’s development of hanging fill, wide indented louvers, and stable FRP velocity-recovery fan cylinders enabled the evolution of that Doubleflow tower into the classic Class 600 shape and function that has set the standard for splash-fill crossflow towers for the past half-century.
/ Mechanical Equipment / Fans Marley designed and manufactured fans are used on Fan Cylinders Venturi-shaped FRP cylinders combine minimal all Marley crossflow towers. The fan selection and fan entrance losses with close blade tip clearances to speed for a given tower are based on tower cell size, produce optimum fan performance. As cylinder heights system losses, and horsepower requirements.
Driveshafts Marley-manufactured driveshafts transmit power from the motor to the Geareducer. All Marley driveshafts are manufactured from either carbon fiber composite or stainless steel tubes with stainless steel flanges. Bonded neoprene flexible elements transmit torque and require no lubrication. Marley driveshafts are full-floating assemblies with flexible couplings on each end. Their tolerance to misalignment and torsional shock is unequalled in nonspecialized units.
/ Fill / Class 600 splash fill bars are available in the following materials: • PVC in “Omega”, “Mega” or “Alpha” configurations. • Injection-molded polypropylene “Ladder” configurations. • Rough sawn, preservative-treated wood “G” configurations. Each cooling tower application is individually reviewed to assure selection of the proper fill type and fill spacing. Performance is computer optimized to assure maximum cooling from a given tower cell size for the design performance conditions.
/ Water Distribution System / Piping Although side inlet piping is provided as standard, Class 600 towers are adaptable to end inlet piping. This is an economical method requiring only one riser for each series of hot water basins, regardless of the number of fan cells. Cast iron, steel, and reinforced plastic pipe are all available. Valves Marley-built flow control valves used on Class 600 towers have proved their reliability in more than 40 years of service.
/ Tower Structure / Class 600 cooling towers are designed in accordance with the latest edition of the National Design Specification for Wood Construction (NDS) published by the National Forest Products Association, and CTI STD-114. Wind load criterion is per ASCE-7, and stability is based upon an applied lateral load of 2.5% of the total operating weight. Allowable stress values for all lumber are reduced for wet service, temperature, and duration as appropriate.
The diagonals brace the structure and carry loads to heavy-duty, hot dip glavanized anchor castings. The anchor castings transmit wind and/or earthquake loads from the structure directly into the foundation. For standard wind load conditions, anchor bolts are required only at the perimeter. Structural ceramic rings or glass reinforced nylon shear plates are used in conventional connector ring joints where greater strength is required than bolted joints provide.
/ Casing / The endwalls of Class 600 towers are cased from the fan deck level to below the top of the basin curb with 8 oz/sq ft corrugated FRP sheets. FRP is waterproof and corrosion proof, is immune to biological deterioration, and requires no maintenance. Sheets are installed on maximum 4′-0″ spans with corrugations running horizontally. Vertical joints are lapped and sealed. Horizontal joints are lapped one corrugation to shed water inward.
/ Maintenance Options / Endwall Derrick The endwall derrick is a permanently installed tripod device of galvanized structural steel. In service, removable structural aluminum tracks are positioned across the platform opening. Equipment to be handled is placed on a 4-wheel dolly—part of the equipment handling package—rolled onto the track and elevated slightly. The track and dolly are removed and the equipment lowered to grade level.
/ Additional Services / SPX Cooling Technologies is dedicated to satisfying the needs of our customers—needs which begin far in advance of the actual purchase of a new Marley cooling tower, and vary over the operating lifetime of the project.
