SPX Cooling Technologies FSIG-TS-08A Specifications, Specification Value, 5.0Mechanical Equipment

Marley / Sigma F Series CoolingTower / Specifications: Base 15

Specifications Specification Value

4.0Fan Deck and Fan Cylinder:

4.1	The fan deck shall act as a working	■The indicated design values for framing and decking not only
	platform for maintenance personnel. It	give you assurance that the tower can withstand long term
	shall consist of 1 1/8" (28.5 mm) deep	operation in a hostile environment—but that it will accept many
	pultruded fiberglass interlocking pan-	years of inspection and maintenance traffic by your operating
	els, supported by structural fiberglass	personnel.
	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 (2.9 kPa)
	or a concentrated load of 400 pounds
	(181 kg). Mid-span deflection at 60 psf
	(2.9 kPa) loading shall not exceed 0.17"
	(4.3 mm).
4.2	Fan cylinders shall be molded FRP.	Fiberglass-reinforced polyester fan cylinders provide the close tip
	They shall be anchored to the fan deck	clearances and smooth airflow contour necessary for good fan
	structure to provide a consistently	performance. The inert, noncorroding nature of FRP assures that
	stable operating shroud for the fan.	these characteristics will persist.

5.0Mechanical Equipment:

5.1	Fan(s) shall be propeller-type, incor-	■ Standard fan drives of other manufacturers may use V-belts.
	porating heavy duty blades of high	Considering the size of fans involved—and the horsepower
	strength, inert fiberglass reinforced	applied—this is not good design practice. Geareducer drive is
	epoxy material. Blades shall be indi-	far more reliable and trouble free, and is currently offered as an
	vidually adjustable and replaceable.	option by most other cooling tower manufacturers.
	Fan(s) shall be driven through a right	The primary means of capacity control on cooling towers is by
	angle, industrial-duty, oil-lubricated,
	geared speed reducer. Speed reducers	cycling fans on and off, or through a variety of speed changes.
	employing pulleys and belts will not be	Such cycling can stretch V-belts, and can reduce their service life
	accepted.	significantly.
5.2	Motor(s) shall be ____ hp maximum,	Unless otherwise specified, motor speed will be 1800 RPM in
	TEFC, 1.15 service factor, and specially	60 Hertz areas and 1500 RPM in 50 Hertz areas. If you prefer the
	insulated for cooling tower duty. Speed	operating flexibility of two-speed operation, please specify the
	and electrical characteristics shall be	RPM to be 1800/900 (1500/750 in 50 Hertz regions). Other speed
	1800 (1800/900) RPM, single winding,	ranges are also available,
	___ phase, ___ hertz, ___ volts.
5.3	Motor shall be located outside the fan	The driveshaft turns at the motor speed and is, therefore, most
	cylinder at the fan deck, and shall be	sensitive to operational imbalance. Stainless steel manufacture
	connected to the speed reducer by a	assures that the driveshaft will not become unbalanced as a
	tubular stainless steel, dynamically bal-	result of corrosion. Stainless steel yokes are available at extra
	anced driveshaft with heavy galvanized	cost, although not normally necessary.
	yokes and neoprene flexible coupling
	elements.
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