Spx Cooling Technologies Tower 160 Users Manual

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/  Marley Class 160 Cooling Tower  /

/ The Marley Difference /
You’ll enjoy single source responsibility and reliability

How many other cooling tower companies can offer you

because we design and manufacture virtually all major cooling

this assurance? They may use Brand “A” nozzles with Brand

tower components.

“B” fill and Brand “C” drift eliminators. When they all come

All Marley components are designed and selected to be

together, the whole may be less than the sum of the parts.

part of an integrated system. For example, the spray pattern

Our total system approach assures that all the parts work

from nozzles and the pressure drop through drift eliminators

together to provide you the greatest total performance.

both affect a fill’s heat transfer capacity. So, we include that

And because we design specifically for cooling towers,

impact in our thermal analysis.

all our components will provide many years of service with

Drift eliminators must be effective at the air velocities

minimal maintenance. From design through installation and on

where fill is most efficient. So, we’ve carefully designed both

throughout your tower’s life, all of SPX will work for you.

components to work together efficiently.

/ Class 160 Tower Advantage /
■	 Guaranteed Performance. Don’t rely on outside agencies

■	 Low Operating Costs. Marley high-efficiency fill and fans,

with limited enforcement powers. We’ll stand by our

gravity-flow water distribution, and efficient Geareducer®

responsibility for reliable thermal performance. We designed

drive work together to offer maximum cooling with

it. We rate it. We guarantee it!

minimum power use.
■	 Low Maintenance Costs. Induced-draft propeller fans on

■	 Long Service Life. We’ve carefully chosen all the materials
used in Class 160 towers for their corrosion resistance

Marley rightangle Geareducer units; TEFC, 1.15 service

and suitability for cooling tower service. Pressure-treated

factor motors; and heavy-duty mechanical equipment

lumber, heavy-galvanized steel, stainless steel, PVC and

supports assure long service life with minimal maintenance.

fiberglass keep your Class 160 tower working year after

■	 All-Season Reliability. Class 160 towers perform as specified

year.

in the heat of summer. They respond well to energy
management techniques in the spring and fall. They

■	 Efficient Field Assembly. Precise factory fabrication assures
that every component in your Class 160 tower will fit as

operate virtually ice-free in the dead of winter. And they

designed. And SPX offers an unparalleled nationwide

offer simple maintenance all year long.

construction organization to build your tower quickly and

We guarantee it!

economically.

■	 Single Source Parts Availability. SPX designs, manufactures,

■	 Easy Maintenance Access. The Class 160’s crossflow design

guarantees, and stocks all major components of the tower

gives you quick, direct access to the open distribution

except motors and some fan sizes. In fact, we stock many

basins, plenum and mechanical components for regular

of those parts, too. We’ll have the parts if you ever need

inspection and service.

them.

2

/ Construction and Components /
■ Fill/Louvers/Drift Eliminators
Marley high-performance film fill is the heart of every Class
160 tower. A repeating chevron pattern provides the wetted
surface and air turbulence necessary for proper heat transfer,
while minimizing resistance to airflow so you’ll save on fan
power. Molded protrusions on each fill sheet assure uniform
spacing.
Fill sheets are vacuum formed 15 mil (.015″) thick
PVC (polyvinyl chloride) capable of service at hot water
temperatures up to 120°F. Consult your Marley sales
representative for applications where hot water temperatures
are greater than 120°F yet less than 145°F to determine
upgrade possibilities. Stainless steel structural tubes resting in
stainless steel hangers support the fill, and PVC tubes control
alignment. This system also holds the bottom of the fill sheets

■ Mechanical Equipment

above the cold water basin floor to simplify basin cleaning.

The Marley Geareducer speed reducer used in the Class

Fill sheets include both louvers and drift eliminators. The
louvers in this patented arrangement keep water on the

160 line contributes a long record of dependability, long service

fill sheets and in your tower, and also assure proper heat

life, and low maintenance. Their designs meet or exceed the

transfer throughout wide variations in airflow. Users find this fill

requirements of CTI STD-111 and AGMA Std. 420.04. We run-

operates ice-free even in extremely cold weather.

in every Geareducer unit under load prior to shipment to make
sure that it will operate properly on your tower.

Integral drift eliminators prevent the costly nuisance of

Housings are gray cast iron. Gears are high-strength,

drift spotting on objects in the sur­round­ing environment.
Their unique shape induces the air flow through three distinct

case hardened alloy steel. And all bearings are tapered roller

direction changes as shown below. The final turn directs air

bearings. A variety of available horsepower capacities and

toward the fan to save you fan horsepower. Moisture carried

reduction ratios lets us choose the optimum Geareducer model

in the air stream can’t make these abrupt turns, so drift is less

and fan speed for your job. Service factors are always at least

than 0.005% of the circulating water flow rate.

2.0 as applied.
Splash-type lubrication and integral cooling fins preclude
the need for maintenance-intensive oil pumps and coolers. A
constant oil bath or flow lubricates every bearing in forward or
reverse motion—at full or half speed.
All Marley Geareducer assemblies are rightangle type with
motors located outside the tower’s saturated airstream.
A galvanized steel lube line runs from the Geareducer unit to
a standpipe near the motor on each cell, so you can check oil
level and change or add oil while standing on the fan deck.

3

■ Water Distribution System

Class 160 towers offer the benefits of adjustable pitch
propeller type fans. All fans used on Class 160 towers include

The gravity-flow water distribution system designed into the

hollow GRE (glass-reinforced epoxy) blades and epoxy-coated

Class 160 tower essentially reduces pump head to its most

cast iron or galvanized steel hubs. Blades are adjustable in

basic component—static lift—saving you money on pump

pitch, so you can take full advantage of rated horsepower or

power. You won’t have to force water through internal piping

adjust the pitch to compensate for unusual jobsite restrictions.

and pressure spray nozzles, as you would in a counterflow

The true airfoil blades, designed specifically for cooling towers,

tower.

offer efficient, quiet operation and long service life.

Warm water enters the system through a Marley galvanized
crossover pipe. Inlet connections for your piping are drilled to
conform to Class 125 ANSI requirements. Marley flow-control
valves balance the flow to both distribution basins of each
cell. Water flows from the valves through a splash-suppression
chamber and into the treated fir plywood distribution basins.
Polypropylene Marley “Spiral Target” nozzles in the basin

Fans operate inside structural FRP (fiber-reinforced
polyester) eased-inlet fan cylinders designed and applied to
maximize fan performance. Standard cylinder heights are
6′-0″ to 7′-0″, depending on fan diameter. 10′-0″ cylinders are

floor then distribute the water uniformly over the fill.

available as an option.

All materials in the water distribution system offer long life

Marley-manufactured driveshafts transmit power from the

and minimal maintenance. Valves consist of cast iron bodies

motor to the Geareducer assembly. All Marley driveshafts

and grease-lubricated stainless steel operating stems. All

include 304 stainless steel tubes with welded-on stainless

plywood is treated exterior grade. The nozzles are chemically

steel flanges and bonded neoprene flexible elements to

and biologically inert, so they’ll last indefinitely.

transmit torque. Marley driveshafts are full-floating assemblies
with non-lubricated flexible couplings on each end. Their

■ Structure and Materials

tolerance to misalignment and torsional shock is unequalled
in non-specialized units. All Marley driveshafts are dynamically

Class 160 tower design conforms to the latest edition of

balanced at the factory to minimize operating vibrations.

the National Design Specification for Wood Construction (NDS)
published by the National Forest Products Association, as well

Welded unitized hot dip galvanized steel supports maintain
alignment throughout the mechanical equipment system.

as CTI standards STD-114 and STD-103. Wind load criterion

Marley torque-tubes provide superior strength and stability.

is normally 30 pounds per square foot of projected area and

Their cylindrical shape also keeps operating costs down by

the design meets criteria for UBC Zone 1 seismic loading,

minimizing airflow restrictions and reducing air turbulence in

based on a maximum water temperature of 120°F.

the fan entrance region.
4

The primary structural elements of all Class 160 towers

Hinged doors through the endwall casing permit access to

are the nominal 4″ x 4″ columns spaced on 4′-0″ longitudinal

the interior of the tower at the basin level. Single-cell towers

centers. A system of nominal 4″ x 4″ tower diagonals carries

have one door. Multicell towers have doors in both endwalls,

loads in both tension and compression to heavy-duty hot dip

plus accessways through any and all partition walls.

galvanized steel anchor plates.

All mechanical equipment is accessible both from the

Pressure-treated Douglas Fir is the standard material for

interior of the tower and through the fan cylinder. Every

structural members in Class 160 towers because it offers

component of every tower is removable and replaceable.

predictably consistent structural strength and provides long
service life in cooling towers.

■ Casing

Unless otherwise specified, all lumber is pressure treated

Tower endwalls are cased with gray 8 oz/sq ft ribbed FRP

after fabrication. Treatment in accordance with CTI Standard

sheets. Water and corrosion-proof FRP is immune to biological

STD-112 is available on request.

deterioration and requires no maintenance.

All structural framing connections use ¹⁄₂″ diameter

Casing ribs run vertically. Vertical joints between sheets

galvanized machine bolts with either fiber-reinforced nylon

are overlapped one rib and are sealed in the fill areas. Casing

shear connectors or FRP connector straps.

attaches to the structural members with stainless steel

The fan deck is pressure treated exterior grade fir plywood

fasteners and neoprene bonded washers. Corner trim pieces

designed for a uniform live load of 60 psf.

are 12 oz/sq ft molded FRP.

■ Access and Safety

■ Cold Water Basin

The Class 160 tower is designed to meet all OSHA

Most Class 160 owners install their towers over concrete

requirements. A 3′-6″ high guardrail system complete with top

cold water basins provided by others—or you can choose a

rails, intermediate rails and toeboards, surrounds the entire top

wood collection basin as an option. See page 11.

perimeter of the tower.

Consult your Marley sales representative for detailed

Aluminum ladders attached to the tower endwalls provide

dimensional drawings and load schedules to help you with

access to the fan deck level. Ladders begin at the cold water

your basin design.

basin level and end at the top of the guardrail around the fan
deck. Each tower normally includes two ladders—one at each
endwall.

5

/ Operating and Environmental Considerations /
■ System Cleanliness

Cooling towers are usually selected to produce a specific
cold water temperature at the higher summertime wet-bulb

Cooling towers are very effective air washers. Atmospheric

temperatures. During the remainder of the year, the cooling

dust able to pass through the relatively small louver

tower is capable of producing much colder water. Unless

openings will enter the circulating water system. Increased

your system will benefit from the coldest possible water

concentrations can intensify system maintenance by clogging

temperature, you may want to consider controlling cold water

screens and strainers; and smaller particulates can coat

temperatures to higher levels. You'll also save energy by using

system heat transfer surfaces. In areas of low flow velocity

such control. See Marley Technical Report

(such as the cold water basin), sedimentary deposits can

#H-001A, “Cooling Tower Energy and its Management”.

provide a breeding ground for bacteria.

Always control leaving water temperature by manipulating

In areas prone to dust and sedimentation, you should

the quantity of air that the fan moves through the

consider installing some means for keeping the cold water

tower. Varying the quantity of water flow is not normally

basin clean. Typical devices include side stream filters and a

recommended and can be harmful in freezing weather. You

variety of filtration media.

can alternately start and stop single-speed motors to keep

You should also plan ahead to develop a consistent,

water temperatures within an acceptable range. But your

effective program of water treatment. A good water treatment

flexibility is limited by the amount of starting time per hour

program will help to assure long service life, while keeping your

allowed by the motor manufacturer.

tower free of potentially harmful biological growths.

Increased flexibility can simplify your operating procedures
and save you money in the long run, both on operation and on
maintenance. Here are two of the more popular options:
❑	 Two-speed motors improve operating flexibility by
increasing the number of potential operating modes. Users
in northern climates will find that the tower can carry winter

Caution

loads at half-speed; reducing fan power requirements
by 85+% during that time. Two-speed motors also help

The cooling tower must be located at such distance and direction
to avoid the possibility of contaminated tower discharge air
being drawn into building fresh air intake ducts. The purchaser
should obtain the services of a Licensed Professional Engineer
or Registered Architect to certify that the location of the tower
is in compliance with applicable air pollution, fire, and clean
air codes.

to control icing during wintertime operation. See Marley
Technical Report #H-003, “Operating Cooling Towers
During Freezing Weather”.
	

Normally, two-speed motors are provided in 1800/900
RPM, single winding configuration, which is the least
expensive two-speed option. They are also available in
other combinations including the more expensive double
winding.

❑	 Frequency modulation devices work well on induced
draft, propeller fan cooling towers such as the Class 160.
However, their design must include the capability to lock
out any critical fan speeds and the very low fan speed
ranges. Consult your Marley sales representative for
specific recommendations when considering variable speed
control. In many cases, for example, you'll achieve the best
results by using a single control to regulate the speed of
several fans on a multicell tower.

6

W OUT TO OUT OF TOWER

/ Tower Schematic /

C DIA. FAN

A BAYS @ 4a-0q= L

5q

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CL COL.

COL. CL

Tower Plan
TOP OF
FAN CYLINDER

B

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TOP OF
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BASE OF
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Endwall Elevation
4OWER
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Last number of model indicates number of cells. Change
as appropriate for your selection. Primary engineering data is
per cell.

2.	
3.	

7

Fan hp is usually less than shown here.
Height shown is from base of tower columns to fan deck. Wood
basin, if used, elevates tower 6¹⁄₄″. If concrete basin is used,
subtract 1′-6″ for height above top of basin curb.

/ Steel Basin Support /

E BAYS @ 4a-0q= L

EACH ADDITIONAL CELL= L
CL COL.

756Oq
OUT OF
BASIN

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FACE “B”
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WHEN REQUIRED

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D
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SUMP

ADDITIONAL OVERFLOW
WHEN REQUIRED

CL COL.

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FACE “C” CASED FACE

B
B
A

W OVERALL WIDTH OF BASIN

A

76	q

756Oq
OUT OF C
COL.
BASIN L

76	q

FACE “D”
AIR INLET FACE

Two beams shown phantom are required on Models 1651 and 1661 only. All 			

Note:	

dimensions are to centers of tower columns—not centers of anchor bolts or beams.

4OWER
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Use this bulletin for preliminary layouts only. All dimensions show
column locations, not anchor bolt locations. Obtain current
drawings from your Marley sales representative before designing
supports.
Other contractors or purchaser must design and erect supporting steel.
If steel beams are used, they must include ⁷⁄₈″ dia. holes to
accept anchor bolts provided by Marley. If concrete beams or
pilasters are used, ³⁄₄″ dia. anchor bolts imbedded in the concrete must be provided by others.

4.	

5.	
6.	

8

Maintain no less than 2′-0″ of clear space at cased faces for
construction purposes. Air inlet faces must have unobstructed
air supply. Consult your Marley sales representative if nearby
obstructions may interfere.
Operating weight is wet weight of tower and wood basin,
including 6″ of water in the cold water basin. This is the recommended operating water level for all models.
For collection basin accessories information request Marley
drawing 90-3231 from your Marley sales representative.

6qMIN.

6qMIN.

A BAYS @ 4a-0q= B PER CELL

6q

RECOMMENDED OPERATING
WATER LEVEL
1a-6q

6q
COL.CL

FACE “B”
AIR INLET FACE

FACE “A” CASED FACE

FACE “C” CASED FACE

CL COL.

FACE “D”
AIR INLET FACE

6qMIN.

W IN TO IN OF BASIN WALLS

6qMIN.

/ Concrete Basin /

RECOMMENDED OPERATING
WATER LEVEL

1a-6q
1a-0q

Flat Slab Basin
4OWER
-ODEL


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Use this bulletin for preliminary layouts only. Do not use for
construction. Obtain current drawings from your Marley sales
representative. Concrete basin design and construction are by
other contractors or purchaser.
Operating weight is total wet operating weight of tower only,
excluding water in concrete basin.
Maintain at least 2′-0″ of clear space at cased faces for construction purposes. Air inlet faces must have unobstructed air
supply. Consult your Marley sales representative for recommendations if nearby obstructions may interfere.

4.	

5.	
6.	

9

Minimum basin depth is 1′-6″. Maximum basin depth is 5′-6″.
Marley will provide (at extra cost) extended interior columns for
deep basins. Perimeter columns remain at 1′-6″ below top of
basin curb.
All anchor bolts, complete with nut and washer, must be furnished by others. Bolts must be ³⁄₄″ diameter with 2″ all-thread
projection.
Other contractors or purchaser must design, locate, construct,
and furnish sump(s) and overflow(s) to suit requirements. The
sump(s) should be designed according to the pump manufacturer’s recommendations. Other design sources: ANSI/HI
specifications 1.1-1.5 for centrifigal pumps, 2.1-2.5 for vertical
pumps, and 9.8 for pump intake design.

E

F MINIMUM

FAN CL TOWER

CL TOWER

/ Inlet Piping Plan /

FACE OF A DIA.
INLET FLANGE

C

D TYPICAL MULTICELL

CL COL.

CL INLET

PIPING SHOWN WITH
HIDDEN LINES IS BY OTHERS
CL INLET

B DIA. FLOW CONTROL VALVE
CL INLET

AND CROSSOVER PIPE

G

BASE OF
TOWER COL.

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Use this bulletin for preliminary layouts only. Obtain current
drawings from your Marley sales representative.
Pumping head contributed by the tower is static lift shown
on page 7. Actual pumping head will vary according to tower
circulating GPM. Total pumping head will be furnished at time of
proposal.
If your application requires a bypass system, recommended
location is through tower endwall into plenum area. Review of
the system by Marley engineering is required.

4.	
5.	

6.	

10

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Marley piping terminates at face of a cast iron flat face flange.
Bolt circle conforms to class 125 lb. ANSI B16.1 specifications.
Supports on tower for crossover piping are furnished by Marley.
Do not support the riser’s dead load or operating load from the
tower. Do not brace the riser’s seismic or thrust loads against
the tower.
On Models 1611 through 1641 with a 32 or 3200 Geareducer
the inlet diameter must be 20″.

/ Available Options /
■ Cell Partition Options

the plenum chamber between fill banks, just inside the endwall
access door to facilitate adjustment and maintenance.

Every Class 160 tower includes plenum partitions and hot
water distribution basin partitions between adjacent cells.
Plenum partitions keep air from entering an operating cell

■ Fire Safety Options

through an adjacent idle fan—assuring consistent thermal

On specific jobs you may want to weigh the cost of various

performance. Basin partitions let you inspect and clean

modifications against the cost (and maintenance) of a sprinkler

individual basins while the rest of the tower continues to

system—or the cost of higher insurance premiums. One or

operate.

more of the following tower modifications may negate the need

Specify extra partitions carefully because excess partitions

for a sprinkler system:

can sometimes discourage routine maintenance and good

❑	 Fire-retardant fan cylinders offer flame spread less than 25

housekeeping procedures. Two options are available to meet

per ASTM E-84.

specific design goals:

❑	 A ¹⁄₄″ thick fiber-reinforced cement board (FRC) overlay on

❑	 Fill area partitions are available, but usually not necessary.

the fan deck acts as a fire stop and provides a nonskid

The solid sheet design of film fill prevents water and air

walking surface.

migration between the fill areas of adjacent cells in all
operating modes.

❑	 A ¹⁄₄″ FRC overlay on the distribution basin covers acts as a
fire stop.

❑	 Complete watertight partitions let you use adjacent cells
to serve separate loads having incompatible system

	

❑	 Barrier walls keep fire from spreading between cells in

temperatures. Watertight partitions consist of exterior

multicell towers. Specify barrier wall design by containment

grade, pressure-treated fir plywood, sealed to cold water

period, such as a “20-minute fire wall”. Barrier walls consist

basin partitions made from the same material as the basin

of pressure-treated fir plywood between cells. Plywood

sides. For concrete basin partitions, Marley drawings

thickness (and cost) vary according to the specified

specify the appropriate design dimensions.

containment time.

Optional weir gates in wood basin partitions let you mix or

❑	 FRP casing having a flame spread rating of 25 or less.

segregate the water in the basin to meet your operating

If your insurance carrier insists on a sprinkler system for

needs.

your tower, consult your Marley sales representative. We can
provide a sprinkler system to fit your needs, or work with your
people to be sure that the sprinkler system and tower will meet

■ Cold Water Collection Basins

your specification.

If you plan to locate your tower above grade, we can supply
a treated Douglas fir cold water collection basin, complete with

■ Non-Standard Motors

the necessary operating accessories. The basin floor is exterior
grade, pressure-treated fir plywood, supported on joists.

Although you can buy your Class 160 tower “less motor”

Basin sides are also plywood, machined to fit the basin floor,

at a cost reduction, it is not normally recommended. Motors

providing a watertight joint after sealing.

supplied on Marley towers meet rigorous specifications

The standard wood basin includes at least one or more

developed from environmental chamber tests at our

depressed, side-outlet sumps, complete with plugged drains

Development Center. These specifications represent prudent

and hot dip galvanized or stainless steel debris screens.

minimum design requirements.

Standard sumps are FRP construction or galvanized steel

Unless otherwise specified, motors provided are TEFC,

depending on outlet size.

1.15 service factor (appropriate to the applied load), 1800

Each basin includes an overflow/cleanout connection

RPM. Other enclosures (such as Explosion Proof) and motors

consisting of a galvanized full coupling and normally-installed

specially wound for nonstandard voltages are available at extra

standpipe which removes easily for flush-out basin cleaning.

cost.

A float operated, mechanical makeup valve automatically

Two-speed motors are also available, and their advantages

replenishes water lost from the system. The valve is located in

are discussed on page 6.
11

/ Available Options /

Accessory

Description and Remarks

Accessory

Description and Remarks

Plywood
Collection Basin

Pressure-treated Douglas fir plywood
collection basin for towers located above
grade. See page 11.

Fire Protection

Sprinkler systems and overlay materials let
you choose from a range of fire protection
options. See page 11.

Extended
Columns for Deep
Collection Basin

Interior tower columns can be extended to
permit concrete basin depth of up to 5’-6”.
Some exceptions apply, so consult your
Marley sales representative.

Ladder
Extension

Used when tower is elevated appreciably
above working level. Extensions attach to
the normal ladder and may require foot
anchorage (depending on length).

Cell Partition

Extra partitions between fan cells for
specific operating considerations. See
page 11.

Stainless Steel
Hardware

All hardware, including assembly hardware
and some specialty items, are series 300
stainless steel

Vibration Limit
Switches

Robertshaw or Metrix single-pole, doublethrow vibration switches in NEMA 4
housing. Double-pole, double-throw
models are also available.

Oil Level Gauge

A brass oil level sight glass replaces the
dip stick on the external oil fill and drain
system. Permits easy reading of oil level
and also provides access for Geareducer
oil changes.

Air Inlet Screen

Galvanized wire mesh screens over the air
inlets keep leaves and debris out of the
tower. Easily removable. Choose either
treated fir frames or galvanized steel
U-edge frames.

Distribution Basin
Cover

Fan Cylinder
Extension

Optional flared fan cylinder extensions
improve fan efficiency to reduce your
operating costs.

Removable, treated fir plywood covers
keep upper basins free of leaves and
debris. They also tend to retard growth of
algae by keeping ultraviolet radiation away
from the warm water in the basins. Covers
may be used as a working surface for
tower maintenance.

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.
Printed in USA | CL160-06



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