SPX Cooling Technologies SS-NC-08A Specifications, Specification Value, 6.0Mechanical Equipment

Marley / NC Class Stainless CoolingTower / Specifications: Base 7

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.

6.0Mechanical Equipment:

6.1Fan(s) shall be propeller-type, incor- porating wide-chord aluminum alloy blades and galvanized hubs. Blades shall be individually adjustable.

Maximum fan tip speed shall be 66 m/s. Fan(s) shall be driven through a right angle, industrial duty, oil lubricat- ed, geared speed reducer that requires no oil changes for the first five (5) years of operation. The gearbox bear- ings shall be rated at an L10A service life of 100,000 hours or greater.

6.1(alternate)* Fan(s) shall be propeller- type, incorporating wide-chord alumi- num alloy blades and galvanized hubs. Blades shall be individually adjustable. Fan(s) shall be driven through a one- piece multi-groove, solid back V-type belt, pulleys, and tapered roller bear- ings. Bearings shall be rated at an L10A service life of 40,000 hours or greater. *Currently available on Models NC8304 through NC8309.

6.2Motor(s) shall be ____ kW maximum, TEFC, 1.15 service factor, variable torque, and specially insulated for cool- ing tower duty. Speed and electrical characteristics shall be ______ RPM, single-winding, ___ phase, ____ hertz,

____ volts. Motor shall operate in the shaft-horizontal position, and name- plate kilowatt shall not be exceeded at design operation.

6.3The complete mechanical equipment assembly for each cell shall be support- ed by a rigid steel structural support that resists misalignment between the motor and the gear reducer.

Specification Value

■The Marley NC is the only crossflow cooling tower approved for single-cell FM installations. This could have a very beneficial effect upon your fire insurance premiums. Towers not able to meet FM requirements may require the inclusion of a fire protection sprinkler system to achieve a comparable level of insur- ance premium cost. Even if you are not

insured by FM, this requirement ensures that each cell will contain any fire that may occur without losing the ability of limited operations and capacity.

■Propeller-type fans require only half the operating hp of blower-type fans. However, they should be readily adjustable to permit compensa- tion for jobsite conditions.

With NC, the choice is yours. The exclusive Marley System5 Geareducer® requires no oil changes for five years, offering you unmatched reliability and low maintenance. Ideal for owners concerned about downtime or maintenance costs. Currently available on 49 NC models, the Marley Power Belt drive system features all-aluminum sheaves, power band belts and long-life bearings for dependable ser- vice.

TEFC motors offer additional benefits over TEAO motors whose only source of cooling is the flow of air produced by the cooling tower fan. This air rate is not always ideal due to motor position, blockage, etc. TEFC ensures the motor will always be cooled properly.

Unless otherwise specified, motor speed will be 1500 RPM on standard models. Low noise models will use motor speeds appropriate for the specific model. If you prefer the operating flexibility of two-speed oper- ation, please specify two-speed, single-winding motors which offer full and half speeds for maximum energy savings. Incidentally, two speed motors are a better choice than separate “pony” motors which simply double the problems indicated above and induce parasitic loads during operation for lower than nameplate efficiency.