/ Marley Sigma F Series Cooling Tower / Engineering Data & Specifications
Marley / Sigma F Series Cooling Tower / Table of Contents Engineering Data Schematic Support Piping Temperature Control Environmental 4 5 7 10 11 Specifications / Base Base Thermal Performance Construction Fan Deck and Fan Cylinder Mechanical Equipment Fill, Louvers and Drift Eliminators Hot Water Distribution System Casing Access and Safety Cold Water Basin Scope of Work 12 13 14 15 15 16 17 17 18 18 19 Specifications / Options Cold Water Basin Options Stainless Steel Cold Water Basin Watertight Parti
Marley / Sigma F Series Cooling Tower / The Sigma F Series is a field-erected, crossflow, fiberglass-structure cooling tower designed to serve normal air conditioning and refrigeration systems as well as medium sized industrial loads. Evolving from the crossflow concept of cooling tower pioneered by Marley in 1938, and incorporating over 65 years of design advancements, the Sigma F Series represents the current state of the art in this cooling tower category.
Marley / Sigma F Series Cooling Tower / Engineering Data : Schematic W OUT-TO-OUT OF TOWER 4 3" CL COLUMN C DIAMETER FAN CL COLUMN A BAYS AT 4'-0" = L COLUMNCL 3" TOWER PLAN TOP OF FAN CYLINDER B Use this data for preliminary layouts only. Obtain current drawing from your Marley sales representative. FAN DECK H The UPDATE web-based selection software — available at spxcooling.com — provides Sigma F Series model recommendations based on customer's specific design requirements.
Marley / Sigma F Series Cooling Tower / Engineering Data : Support A SPACES AT 4'-0" = L 5 INTERMEDIATE BEAM CASED ENDWALL FACE MAKEUP VALVE SUMP CASED ENDWALL FACE W OVERALL OF BASIN AIR INLET FACE OVERFLOW AIR INLET FACE CL COL. & ANCH. BOLT PRIMARY SUPPORT BEAM PLAN 2 1/4" MAX.
Marley / Sigma F Series Cooling Tower / Engineering Data : Support A SPACES AT 4'-0" = L B AIR INLET FACE CASED ENDWALL FACE CASED ENDWALL FACE OPTIONAL PARTITION WALL FOR INDIVIDUAL CELL OPERATION P W IN TO IN OF CURB WALLS 6" MIN TYP 6 B AIR INLET FACE SUMP SEE NOTE 7 TOP OF BASIN CURB TOP OF PARTITION WALL 1'-4" 1'-6" Plan 1'-6" TOP OF BASIN CURB 1'-0" 6" MIN OPERATING WATER LEVEL RECOMMENDED Section P Section B Tower Model NOTE Operating Weight lb Dimensions Note 4 A W L Singl
Marley / Sigma F Series Cooling Tower / Engineering Data : Piping Plan 2 C D TYP. SINGLE CELL CL FAN CL INLET CL FAN CL INLET TYP. MULTICELL 7 C CL COLUMN AND ANCHOR BOLT CL INLET CL COLUMN AND ANCHOR BOLT TOWER CL AND FAN F B DIAMETER F CROSSOVER PIPE MOTOR MOTOR PIPING LOADS SUPPORTED BY OTHERS PIPING LOADS SUPPORTED BY TOWER FAN CL TOWER CL INLET Plan FACE OF A DIA. GALVANIZED FLANGE FLANGE IS 3/4" THICK. BOLT CIRCLE CONFORMS TO 125 LB.
Marley / Sigma F Series Cooling Tower / Engineering Data : Piping Plan 3 C D TYP. SINGLE CELL CL FAN H CL COLUMN AND ANCHOR BOLT CL FAN TYP. MULTICELL 8 C CL COLUMN AND ANCHOR BOLT CL RISER CL RISER TOWER CL AND FAN F MOTOR Plan FAN CL TOWER F MOTOR CL INLET RISER H G RISER CL B DIAMETER CL CROSSOVER PIPE FACE OF A DIA. GALVANIZED FLANGE CL FAN FLANGE IS 3/4" THICK. BOLT CIRCLE CONFORMS TO 125 LB.
Marley / Sigma F Series Cooling Tower / Engineering Data : Piping Plan 4 C D TYP. SINGLE CELL CL FAN TYP. MULTICELL H CL COLUMN AND ANCHOR BOLT CL FAN C CL COLUMN AND ANCHOR BOLT CL RISER AND HEADER CL RISER TOWER CL AND FAN F MOTOR Plan FAN CL TOWER F CL INLET RISER B DIAMETER CROSSOVER PIPE RISER CL H FACE OF A DIA. GALVANIZED FLANGE CL FAN FLANGE IS 3/4" THICK. BOLT CIRCLE CONFORMS TO 125 LB.
Marley / Sigma F Series Cooling Tower / Engineering Data: Energy Management Cooling towers are usually selected to produce a specific cold water temperature at the higher summertime 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 F Series Cooling Tower / Engineering Data: Environmental Sound Control Keeping It Clean Sound produced by a Sigma tower operating in an unobstructed environment will meet all but the most restrictive noise limitations—and will react favorably to natural attenuation. Where the tower has been sized to operate within an enclosure, the enclosure itself will have a damping effect on sound. Sound also declines with distance—by about 5 dBA each time the distance doubles.
Marley / Sigma F Series Cooling Tower / Specifications: Base Specifications 1.0 Base: 1.1 Furnish and install an induced-draft, crossflow-type, field-erected, structural fiberglass-framed, PVC film-fill, industrialduty 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, driven by ___ @ _____ hp motor(s).
Marley / Sigma F Series Cooling Tower / Specifications: Base Specification Value 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 F Series Cooling Tower / Specifications: Base Specifications 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 calcium content (CaCO3) up to 800 ppm; silica (SiO2) up to 150 ppm; and design hot water temperatures up to 120°F (48.9°C). The circulating water will contain no oil, grease, fatty acids, or organic solvents.
Marley / Sigma F Series 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 consist of 1 1/8" (28.5 mm) deep pultruded fiberglass interlocking panels, supported by structural fiberglass joists on 3'-0" (914 mm) maximum centers. Fan deck shall have a nonskid surface. Deck shall be designed for a uniform live load of 60 psf (2.
Marley / Sigma F Series Cooling Tower / Specifications: Base Specifications 5.4 A stainless steel oil fill and drain line shall extend from the gear reducer to the vicinity of the motor, and shall be equipped with a bronze-bodied oil level sight-glass gauge. 5.5 The complete mechanical equipment assembly for each cell shall be supported by a rigid, unitized support that resists misalignment between the motor and the gear reducer.
Marley / Sigma F Series Cooling Tower / Specifications: Base Specifications 7.0 Hot Water Distribution System: 7.1 The mechanical equipment support/ crossover pipe for each cell shall be equipped with a flange for the attachment of customer supply piping. Inlet and bolt circle dimensions shall conform to 125# flange specifications. The crossover pipe shall deliver water through PVC perforated pipes to two open, stainless steel, hot water basins at the fan deck elevation.
Marley / Sigma F Series Cooling Tower / Specifications: Base Specifications 9.0 Access and Safety: 9.1 Single cell towers shall include a 33" (838 mm) wide by 61" (1.55 m) high molded FRP access door in one endwall casing for access to the interior of the tower. Casing access door shall be hinged and equipped with a latch operable from both inside and outside the tower.
Marley / Sigma F Series Cooling Tower / Specifications: Base Specifications 11.0 Scope of Work: 11.1 The cooling tower manufacturer shall be responsible for the design, fabrication, and delivery of materials to the project site, and for the erection of the tower over supports provided by others. Unless otherwise specified, all supply and return piping, pumps, controls, and electrical wiring will be outside the cooling tower manufacturer's scope of work.
Marley / Sigma F Series Cooling Tower / Specifications: Options Specifications Specification Value Cold Water Basin Options Stainless Steel Cold Water Basin: 10.1 Replace paragraph 10.1 with the following: Include a cold water collection basin constructed of 12 gauge series 304 stainless steel, throughbolted and sealed to prevent leakage. A depressed, side outlet sump of series 304 stainless steel having a 1⁄4" (6.
Marley / Sigma F Series Cooling Tower / Specifications: Options Specifications Specification Value and a solid state circuit board for temperature control and low water cutoff. A control probe shall be located in the basin to monitor water level and temperature. The system shall be capable of maintaining 40°F water temperature at an ambient air temperature of ____ °F. Wiring of the heaters and the heater components shall be the responsibility of the purchaser.
Marley / Sigma F Series Cooling Tower / Specifications: Options Specifications Plenum Walkway: 9.1 Add the following to the end of this paragraph: Provide a 30" (762 mm) minimum wide walkway extending from one endwall access door to the other through the length of the tower. Walkway shall be constructed of fiberglass components with a nonskid surface on floor members, and the top of the walkway shall be above the cold water basin overflow level. If the cold water basin is deeper than 4'-0" (1.
Marley / Sigma F Series Cooling Tower / Specifications: Options Specifications Air Inlet Screens: 6.3 Add the following paragraph in the Fill, Louvers and Drift Eliminators section: The air inlet faces of the tower shall be covered by 1" mesh stainless steel welded wire screens. Screens shall be secured to stainless steel frames, and shall be removable. Appearance Options Architectural Casing: 8.1 Replace paragraph 8.
Marley / Sigma F Series Cooling Tower / Specifications: Options Specifications Specification Value Control Options Control System: 5.7 Add the following paragraphs 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 F Series Cooling Tower / Specifications: Options Specifications Specification Value Fan Motor Variable Speed Drive: Marley All Weather ACH550 System 6.4 Add the following paragraph in the Mechanical Equipment section when VFD is used with customers Building Management System: A complete UL listed Variable Speed Drive system in a NEMA 1 indoor, NEMA 12 indoor or NEMA 3R outdoor enclosure shall be provided. The VFD shall use PWM technology with IGBT switching and integrated bypass design.
Marley / Sigma F Series Cooling Tower / Specifications: Options Specifications and cooling is no longer required. The fluid cooler manufacturer shall supply VFD start-up assistance. Tower vibration testing throughout the speed range is required to identify and lockout any natural frequency vibration levels which may exceed CTI guidelines. Marley Premium VFD System 6.
Marley / Sigma F Series Cooling Tower / Specifications: Options Specifications Specification Value consist of start and stop control, bypass/ VFD selector switch, Auto/Manual selector switch, manual speed control, and solid-state temperature controller. An emergency bypass selector switch internal to the panel allowing the fluid cooler fan motor to be run at full speed shall be furnished.
Marley / Sigma F Series Cooling Tower / Specifications: Options Specifications Fiberglass Ladder: 9.3 Change paragraph 9.3 to read as follows: One endwall of the tower shall be equipped with an 18" (457 mm) wide fiberglass vertical ladder, supported by hot-dip galvanized steel brackets 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.
Marley / Sigma F Series Cooling Tower / Specifications: Options Specifications Specification Value 29
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