/ Marley Sigma 1000/1200 Cooling Tower / Engineering Data & Specifications
Marley / Sigma 1000/1200 Cooling Tower / Table of Contents Engineering Data 1000 Schematic 1000 Piping 1000 Support 1200 Schematic 1200 Piping 1200 Support Energy Management Environmental 4 5 6 8 9 10 12 13 Specifications / Base Base Thermal Performance Construction Fan Deck and Fan Cylinder Mechanical Equipment Fill, Louvers and Drift Eliminators Hot Water Distribution System Casing Access Cold Water Collection Basin Scope of Work 14 15 16 17 18 19 20 20 20 21 21 Specifications / Options Control Optio
Marley / Sigma 1000/1200 Cooling Tower / S igma 1000/1200 towers are field-erected, general purpose crossflow wood cooling towers, designed to serve normal air conditioning and refrigeration systems as well as medium sized industrial loads. They evolve from the crossflow concept of towers pioneered by Marley in 1938, and incorporate over 65 years of design advancements that our customers have found valuable. Sigma cooling towers represent the current state of the art in this cooling tower category.
Marley / Sigma 1000 Cooling Tower / Engineering Data : Schematic W OUT TO OUT OF TOWER 4 C DIA. FAN PLAN CL COL. CL COL. COL. CL A BAYS @ 4'-0 = L 5" 5" TOP OF FAN CYLINDER TOP OF FAN DECK B Endwall Elevation H BASE OF TOWER COLUMNS Tower Model GPM per cell Width W Length L Height H A B C Maximum Motor hp Static Lift 1011 380 - 2140 21'-5" 8'-0" 11'-85⁄8" 2 3'-8" 84" 30 11.7' 1021 580 - 3220 21'-5" 12'-0" 11'-8 ⁄8" 3 3'-5" 96" 30 11.
Marley / Sigma 1000 Cooling Tower / Engineering Data : Piping 5 B DIA. FLOW CONTROL FAN CL TOWER Plan MINIMUM FAN CL TOWER VALVE AND CROSS OVER PIPING F E FACE OF A DIA. INLET PIPING CL COL. D TYP.
Marley / Sigma 1000 Cooling Tower / Engineering Data : Support 6 OVERALL LENGTH OF BASIN C BAYS @ 4'-0 = L 7 1/2" EACH ADDITIONAL CELL = L 11 1/2" CL 7/8" ANCHOR BOLT HOLES AIR INLET FACE CL 7/8" ANCHOR CL BOLT HOLES CL 7/8" ANCHOR BOLT HOLES A W OVERALL WIDTH OF BASIN 7 1/2" 7/8" ANCHOR C L BOLT HOLES OVERFLOW A ENDWALL FACE ADDITIONAL SUMP WHEN REQUIRED CL 7/8" ANCHOR CL BOLT HOLES B ENDWALL FACE B CL TOWER SUMP AIR INLET FACE 11 1/2" Plan Operating Weight lb Dimensions Tower
Marley / Sigma 1000 Cooling Tower / Engineering Data : Concrete Basin 7 A BAYS @ 4'-0" = B PER CELL 6" 6" MIN. 6" MIN. COL. CL ENDWALL FACE W IN TO IN OF BASIN WALLS Plan AIR INLET FACE 6" MIN. ENDWALL FACE CL COL. 6" MIN.
Marley / Sigma 1200 Cooling Tower / Engineering Data : Schematic W OUT TO OUT OF TOWER 8 C DIA. FAN Plan CL COL. CL COL. 5" COL. CL A BAYS @ 4'-0 = L 5" TOP OF FAN CYLINDER B TOP OF FAN DECK Endwall Elevation H BASE OF TOWER COLUMNS Tower Model GPM Per Cell Width W Length L Height H A B C Maximum Motor hp Static Lift 1211 1050 - 5750 31'-2" 16'-0" 14'-51⁄8" 4 6'-0" 144" 60 14.5' 1221 1050 - 5750 33'-2" 16'-0" 14'-5 ⁄8" 4 7'-0" 168" 75 14.
Marley / Sigma 1200 Cooling Tower / Engineering Data : Piping 9 Plan MINIMUM FAN CL TOWER FAN CL TOWER B DIA. FLOW CONTROL VALVE AND CROSS OVER PIPING F E FACE OF A DIA. INLET PIPING CL INLET C CL INLET D TYP. MULTI-CELL PIPING SHOWN WITH DASHED LINES IS BY OTHERS CL INLET CL COL.
Marley / Sigma 1200 Cooling Tower / Engineering Data : Support 10 OVERALL LENGTH OF BASIN C BAYS @ 4'-0 = L 7 1/2" EACH ADDITIONAL CELL = L CL ANCHOR 11 5/8" CL COL.
Marley / Sigma 1200 Cooling Tower / Engineering Data : Concrete Basin 11 A BAYS @ 4'-0" = B PER CELL 6" MIN. CL COL. AIR INLET FACE 6" MIN. COL. CL ENDWALL FACE ENDWALL FACE W IN TO IN OF BASIN WALLS Plan 6" 6" 6" MIN. AIR INLET FACE 6" MIN.
Marley / Sigma 1000/1200 Cooling Tower / Engineering Data: Energy Management Cooling towers are usually selected to produce a specific cold water temperature at the higher summer-time wet-bulb temperatures. During the remainder of the year, the cooling tower is capable of producing much colder water. Unless your system will benefit from the coldest possible water temperature, you should consider controlling cold water temperatures to higher levels. You’ll also save energy by using such control.
Marley / Sigma 1000/1200 Cooling Tower / Engineering Data: Environmental Enclosures System Cleanliness Occasionally, cooling towers are located inside architectural enclosures for aesthetic reasons. Although Sigma towers adapt well to enclosures, a poorly designed enclosure can impair proper operation. An effective design includes generous air inlet paths, with the tower’s fan cylinder discharge at or above the top of the enclosure.
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Base Specifications 1.0 Base: 1.1 Furnish and install an induced-draft, crossflow-type, field-erected, woodframed, PVC fill, industrial-duty cooling tower of _____ cell(s), as shown on Plans. The limiting overall dimensions of the tower shall be _____ wide, ___ __ long, and _____ high to the top of the fan cylinder. Total operating horsepower of all fans shall not exceed ____ hp, consisting of ___ @ _____ hp motor(s).
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Base Specifications 2.0 Thermal Performance: 2.1 The tower shall be capable of cooling _____ GPM of water from ____ °F to _____ °F at a design entering air wetbulb temperature of _____ °F. The cooling tower manufacturer shall guarantee that the tower supplied will meet the specified performance conditions when the tower is installed according to plans.
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Base Specifications Specification Value 3.0 Construction: 3.1 The tower shall be capable of withstanding water having a pH of 6.5 to 8.0; a chloride content (NaCl) up to 750 ppm; a sulfate content (SO4 ) up to 1200 ppm; a sodium bicarbonate content (NaHCO3) up to 200 ppm; a calcium content (CaCO3) up to 800 ppm; silica (SiO2) up to 150 ppm; and design hot water temperatures up to 120°F.
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Base Specification Value Specifications 4.0 Fan Deck and Fan Cylinder: 4.1 The fan deck shall act as a working platform for maintenance personnel. It shall be fabricated of no less than 1" thick, 7 ply, exterior grade, treated Douglas Fir plywood, and shall be designed for a uniform live load of 60 psf or a concentrated load of 600 pounds. 4.2 17 Fan cylinders shall be molded FRP.
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Base Specifications 5.0 Mechanical Equipment: 5.1 Fan(s) shall be propeller-type, incorporating heavy duty blades of cast aluminum or high strength, inert composite material. Blades shall be individually adjustable and replaceable. Fan(s) shall be driven through a rightangle, industrial-duty, oil-lubricated, geared speed reducer. Speed reducers employing pulleys and belts will not be accepted. 5.2 Motor(s) shall be ____ hp maximum, TEFC, 1.
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Base 19 Specification Value Specifications 6.0 Fill, Louvers and Drift Eliminators: 6.1 Fill shall be film-type, 15 mil thick, thermoformed PVC, with louvers formed as part of each fill sheet. Fill shall be suspended from stainless steel structural tubing supported from the upper 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 / Sigma 1000/1200 Cooling Tower / Specifications: Base Specification Value Specifications 7.0 Hot Water Distribution System: 7.1 The mechanical equipment support/ crossover pipe shall deliver water to two open hot water basins per cell at the fan deck elevation. Water shall exit these basins to the fill by gravity through metering orifice-type polypropylene nozzles situated in the basin floor. Nozzles shall be easily removable and replaceable. 7.
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Base Specifications 9.3 Each endwall of the tower shall be equipped with a 20" wide aluminum vertical ladder, through-bolted to the endwall structure. Ladder shall rise from the cold water basin level to the top of the fan deck guardrail, and shall be designed and installed in conformance with OSHA standards. 10.0 Cold Water Collection Basin: 10.
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Options Specifications Specification Value Control Options Control System: 5.7 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 NEMA 3R or 4X outdoor enclosure capable of controlling single-speed or two-speed motors as required, and designed specifically for cooling tower applications.
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Options Specification Value Specifications Basin Heater: 10.2 Add the following paragraph in the Cold Water Basin section: Provide a system of electric immersion heaters and controls for each cell of the tower to prevent freezing of water in the collection basin during periods of shutdown.
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Options Specifications to modulate fan speed maintaining set point temperature. The drive's panel display shall be able to display the set-point temperature and cold-fluid temperature on two separate lines. The bypass shall include a complete magnetic bypass circuit and with capability to isolate the VFD when in the bypass mode. Transfer to the bypass mode shall be manual in the event of VFD failure.
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Options Specifications Specification Value set point shall be displayed on the door of the control panel. The bypass shall include a complete magnetic bypass circuit with capability to isolate the VFD when in the bypass mode. Transfer to the bypass mode shall be automatic in the event of VFD failure or for specific trip conditions allowing safe transfer of utility voltage to the motor. Automatic bypass with an earth ground condition is not allowed.
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Options Specifications Specification Value Convenience and Safety Options Stairway: 9.3 Replace paragraph 9.3 with the following: A 30" wide, column supported, 45° stairway with 8" rise and run of treated Douglas Fir shall be provided at the tower endwall rising from grade (roof) to the fan deck elevation. Stair columns shall be 4x4. Guardrails shall be 2"x4". The upper guardrail shall have an eased edge for the protection of operating personnel.
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Options Specifications Oil Level Sight Glass: 5.4 Replace paragraph 5.4 with the following: A galvanized oil gauge and drain line shall extend from the gear reducer to the vicinity of the motor, and shall be equipped with a bronzebodied oil level sight glass. Specification Value ■ The oil level sight glass is a convenience item that is preferred by many users. The same purpose is, of course, served by either the dip stick or the sight glass.
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Options Specifications Low Noise Tower: 1.1 Add the following at the end of this paragraph: The cooling tower shall be quiet operating, and shall produce an overall level of sound no higher than ____ dBA at the critical location indicated on the Plans.
Marley / Sigma 1000/1200 Cooling Tower / Specifications: Options Specifications Watertight Partitions Between Cells: 3.5 Replace the last sentence in this paragraph with the following: Partitions shall be 3/4" x 5-ply, factoryfabricated, grooved and splined treated Douglas Fir plywood sheets, installed and sealed watertight to permit independent cell operation.
7401 WEST 129 STREET OVERLAND PARK, KANSAS 66213 UNITED STATES 913 664 7400 spxcooling@spx.com spxcooling.com In the interest of technological progress, all products are subject to design and/or material change without notice. ©2008 SPX Cooling Technologies, Inc.
