/ Marley NC Class Stainless Crossflow Cooling Tower / Product Specifications
Marley / NC Class Stainless Cooling Tower / Contents 2 Specifications / Base Base Thermal Performance Performance Warranty Design Loading Construction Mechanical Equipment Fill, Louvers and Drift Eliminators Hot Water Distribution System Casing, Fan Deck and Fan Cylinder Access Cold Water Collection Basin 4 4 5 5 6 7 8 9 9 10 10 Specifications / Options Convenience and Safety Options Guardrail and Ladder Ladder Extension Ladder Safety Cage Ladder Safety Gate Access Door Platform Plenum Walkway Interior
Marley / NC Class Stainless Cooling Tower / NC Class Stainless Steel towers are factory assembled, crossflow cooling towers, designed to serve air conditioning and refrigeration systems as well as light to medium industrial process loads on clean water. They evolve from a factory-assembled concept of towers pioneered by Marley some 50 years ago, and incorporate all of the design advancements that our customers have found valuable.
Marley / NC Class Stainless Cooling Tower / Specifications: Base Specifications 1.0 Base: 1.1 Provide an induced draft, crossflow type, factory assembled, film fill, industrial duty, stainless steel cooling tower situated as shown on the plans. The limiting overall dimensions of the tower shall be _____ wide, _____ long, and _____ high. Total operating kilowatt of all fans shall not exceed ____ kW, consisting of ___ @ _____ kW motor(s).
Marley / NC Class Stainless Cooling Tower / Specifications: Base Specifications 2.0 Thermal Performance and Efficiency: 2.1 The tower shall be capable of cooling _____ m3/h of water from ____ °C to _____ °C at a design entering air wetbulb temperature of _____ C and its thermal rating shall be Certified by the Cooling Technology Institute. 2.2 The tower shall be capable of a minimum _____ m3/h/kilowatt efficiency per ASHRAE Standard 90.1. 2.
Marley / NC Class Stainless Cooling Tower / Specifications: Base Specifications designed for 2.4kPa live load or a 91kg concentrated load. Guardrails, where specified, shall be capable of withstanding a 890N concentrated live load in any direction, and shall be designed in accordance with OSHA guidelines. 5.0 Construction: 5.1 Except where otherwise specified, all components of the cooling tower shall be fabricated of heavy-gauge, series 300 stainless steel.
Marley / NC Class Stainless Cooling Tower / Specifications: Base Specifications 5.3* The tower shall include all design and material modifications necessary to meet the fire rating requirements of Factory Mutual. The product proposed shall be listed in the FM Approval Guide, latest edition. *Standard on models NC8301 thru NC8309. Available as an option on models NC8310 thru NC8312. 6.0 Mechanical Equipment: 6.
Marley / NC Class Stainless Cooling Tower / Specifications: Base 8 Specification Value Specifications 7.0 Fill, Louvers and Drift Eliminators: 7.1 Fill shall be film type, thermoformed of 0.40mm thick PVC, with louvers formed as part of each fill sheet. Fill shall be suspended from hot dip galvanized structural tubing supported from the tower structure, and shall be elevated above the floor of the cold water basin to facilitate cleaning. Air inlet faces of the tower shall be free of water splash-out.
Marley / NC Class Stainless Cooling Tower / Specifications: Base Specifications 9 Specification Value 8.0 Hot Water Distribution System: 8.1 Two stainless steel open basins (one above each bank of fill) shall receive hot water piped to each cell of the tower. These basins shall be installed and sealed at the factory, and shall be equipped with removable, stainless steel covers capable of withstanding the loads described in paragraph 4.1.
Marley / NC Class Stainless Cooling Tower / Specifications: Base Specifications 10.0 Access: 10.1 A large stainless steel, rectangular access door shall be located on both end panels for entry into the cold water basin. Doors shall provide access to the fan plenum area to facilitate inspection and allow maintenance to the fan drive system. 11.0 Cold Water Collection Basin: 11.
Marley / NC Class Stainless Cooling Tower / Specifications: Options Specifications Specification Value Convenience and Safety Options Guardrail and Ladder: 11.2 Add the following paragraph in the Access section: The top of the tower shall be equipped with a sturdy guardrail, complete with kneerail and toeboard, designed according to OSHA guidelines and factory welded into subassemblies for ease of field installation. Posts, toprails and kneerails shall be 38mm square tubing.
Marley / NC Class Stainless Cooling Tower / Specifications: Options Specifications Specification Value GUARDRAIL LADDER LADDER EXTENSION ACCESS DOOR PLATFORM 12
Marley / NC Class Stainless Cooling Tower / Specifications: Options Specifications Specification Value Access Door Platform: 11.2 Add the following paragraph in the Access section: There shall be an access platform at the base of the tower extending from the vertical ladder to the endwall access door. The platform shall be galvanized steel bar grating, supported by galvanized steel framework attached to the tower. The platform shall be surrounded by a guardrail, kneerail, and toeboard.
Marley / NC Class Stainless Cooling Tower / Specifications: Options Specifications Specification Value Control Options Fan Motor Starter Control Panel: 6.4 Add the following paragraph in the Mechanical Equipment section: Each cell of the cooling tower shall be equipped with a UL listed control system in a IP14 or IP56 outdoor enclosure capable of controlling single-speed or two-speed motors as required, and designed specifically for cooling tower applications.
Marley / NC Class Stainless Cooling Tower / Specifications: Options 15 Specification Value Specifications Vibration Limit Switch: 6.5 Add the following paragraph in the Mechanical Equipment section: A single-pole, double-throw vibration limit switch in a IP56 housing shall be installed on the mechanical equipment support for wiring into the fan motor shutdown circuit. The purpose of this switch will be to interrupt power to the motor in the event of excessive vibration.
Marley / NC Class Stainless Cooling Tower / Specifications: Options Specifications 16 Specification Value in quantities and locations as indicated on the drawings. An overflow and drain connection shall be provided in each cell of the cooling tower. The basin floor shall slope toward the drain to allow complete flush out of debris and silt which may accumulate. Towers of more than one cell shall include stainless steel flumes for flow and equalization between cells.
Marley / NC Class Stainless Cooling Tower / Specifications: Options Specifications cold-water temperature. The application must be able to handle very cold water while VFD is in a by-pass mode. Operator controls shall be mounted on the front of the enclosure and shall consist of start and stop control, bypass/VFD selection, Auto/Manual selections, manual speed control.
Marley / NC Class Stainless Cooling Tower / Specifications: Options Specifications 18 Specification Value shall be operated as a stand- alone system without the need for a BMS system. Operator controls shall be mounted on the front of the enclosure and shall consist of start and stop control, bypass/ VFD selector switch, Auto/Manual selector switch, manual speed control, and solid-state temperature controller.
Marley / NC Class Stainless Cooling Tower / Specifications: Options Specification Value Specifications Inlet Flow Control Valves: 8.2: Add the following to the end of the paragraph: Heavy-duty flow-regulator valves shall be provided at the hot water inlet connections. These valves shall be disc-type, with cast iron bodies and stainless steel operating stems. There shall be a locking handle to maintain the valve setting in any position.
Marley / NC Class Stainless Cooling Tower / Specifications: Options Specifications box which is self supporting. The inlet attenuation will not be allowed to impact the thermal performance efficiency of the basic tower configuration. Outlet Sound Attenuation 1.4 Add the following paragraph under Base: The cooling tower shall be equipped with outlet sound attenuation baffles positioned and spaced horizontally across the entire fan opening.
Marley / NC Class Stainless Cooling Tower / Specifications: Options Specification Value Specifications Ultra Low-Noise Fan 1.4 Replace paragraph 6.1 with the following: Fan(s) shall be propeller-type, incorporating wide-chord forwardswept FRP blades and galvanized hubs. Blades shall be individually adjustable. Maximum fan tip speed shall be 51 m/s.
Marley / NC Class Stainless Cooling Tower / Specifications: Options Specifications 22 Specification Value ______ psf, as well as a ______ seismic load. The fan deck and hot water basin covers shall be designed for 50 psf live load or a 200 lb. concentrated load. Guardrails, where specified, shall be capable of withstanding a 200 lb. concentrated live load in any direction, and shall be designed in accordance with OSHA guidelines. Multicell Basin Equalizer Outlets: 11.
SPX COOLING TECHNOLOGIES UK LTD. GREGORY’S BANK WORCESTER WR3 8AB UNITED KINGDOM +44 (0) 1905 720 200 info.uk@spx.com spxcooling.com In the interest of technological progress, all products are subject to design and/or material change without notice.
