Marley MC Fluid Cooler
/
/
Engineering Data & Specifications
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler
/
/
3
■ Air Movement Package
Forward-curved centrifugal fans are dynamically balanced and mounted on tubular steel shafts.
Fans are supported by roller-bearings mounted at both ends with heavy-guage steel supports.
Spherical roller bearings are rated at an L10 life of 50,000 hours.
Fan guard / Air-inlet screens are 16 gauge galvanized steel.
TEFC Fan Motor—1.15 service factor, variable torque, and specially insulated for fluid cooler duty.
The MC Fluid Cooler air movement package including the structural support—guaranteed against failure for
a period of five full years. The motor is warranted separately by the motor manufacturer.
■ Water Distribution System
Pressurized spray system distributes water evenly over the coil. Steel header box with PVC branch arms.
Low-clog polypropylene nozzles—delivers precise distribution of water over the coil area.
Marley's hot-dipped galvanized coil is tested at 2757 kPa to ensure integrity and sloped to ensure total
drainage at shutdown
Marley XCEL drift eliminators—limit drift losses to no more than .005% of the design m3/hr flow rate.
■ Structure
Forced-draft, counter-flow design requires considerably less plan area than crossflow fluid coolers typically use.
Series 300 stainless steel or heavy mill galvanized steel construction.
Factory assembled—ensures final field installation will be hassle-free.
Centrifugal fans and a fully-enclosed falling water area create one of the quietest fluid cooler configurations on
the market.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler
/
/
4
The Marley MC Fluid Cooler is particularly suited
to the urban environment, reducing noise while
increasing energy efficiency and performance.
By keeping the process fluid in a clean, closed
loop, and combining the function of a cooling
tower and heat exchanger into one system, they
provide superior operational and maintenance
benefits.
Pages 17 thru 20 indicate those paragraphs
which will result in the purchase of a basic fluid
cooler—one that accomplishes the specified
thermal performance, but which will lack
many operation—and maintenance-enhancing
accessories and features that are usually desired
by those persons who are responsible for the
continuing operation of the system of which the
fluid cooler is part. It will also incorporate those
standard materials which testing and experience
has proven to provide acceptable longevity in
normal operating conditions.
The specifications portion of this publication not
only relates the language to use in describing an
appropriate MC Fluid Cooler—but also defines
why certain items and features are important
enough to specify with the intention of insisting
upon compliance by all bidders. The left-hand
column of pages 17 thru 26 provides appropriate
text for the various specification paragraphs,
whereas the right-hand column comments on the
meaning of the subject matter and explains its
value.
Pages 21 thru 26 provide paragraphs intended to
add those features, components and materials
that will customize the fluid cooler to meet the
user‘s requirements.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Engineering Data : Schematic
/
/
5
Use this data for preliminary layouts only.
Obtain current drawing from your Marley sales
representative.
The UPDATE web-based selection software
MC Fluid Cooler model recommendations based
on customer's specific design requirements.
108
1249
1829
4" INLET
C
H
4" OUTLET
INSTALLED
HEIGHT
ACCESS
ACCESS
1448
279
SIDE ELEVATION
AIR INLET ELEVATION
ALL MODELS
MODELS 7012D081 - 7012H121
108
3654
108
2740
C
H
INSTALLED
HEIGHT
1448
279
279
AIR INLET ELEVATION
AIR INLET ELEVATION
MODELS 7013F081 - 7013J121
MODELS 7014H081 - 7014K121
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Engineering Data : Schematic
/
/
6
Dimensions
Shipping Weight kg
Operating
Weight
kg
Motor
kW
Pump
kW
Model
Heaviest
H
C
Weight per Cell
Section
7012D081
7012F081
7012H081
7012D101
7012F101
7012H101
7012D121
7012F121
7012H121
7013F081
7013H081
7013J081
7013F101
7013H101
7013J101
7013F121
7013H121
7013J121
7014H081
7014J081
7014K081
7014H101
7014J101
7014K101
7014H121
7014J121
7014K121
2.2
3.7
5.6
2.2
3.7
5.6
2.2
3.7
5.6
3.7
5.6
7. 5
2832
813
1041
1270
813
.4
.4
1628
1854
2037
2207
2448
2696
2789
3098
3409
1412
977
3061
3289
2832
3061
3289
2832
3061
3289
1583
1754
1830
2060
2290
2299
2587
2875
1148
1320
1278
1509
1739
1600
1887
2176
.4
.6
3.7
5.6
7. 5
1041
1270
813
.6
3.7
5.6
7. 5
.6
5.6
7. 5
.75
.75
.75
11.2
5.6
7. 5
1041
1270
11.2
5.6
7. 5
11.2
NOTE
1 Use this bulletin for preliminary layouts only. Obtain
current drawings from your Marley sales representative.
All table data is per cell.
2 Standard overflow is a 2" dia. F connection located
on the side of the collection basin. Makeup water
connection is a 1" dia. M connection located on the side
of the collection basin. Drain is a 2"F connection located
on the side of the collection basin.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Engineering Data : Schematic
/
/
7
Use this data for preliminary layouts only.
Obtain current drawing from your Marley sales
representative.
The UPDATE web-based selection software
MC Fluid Cooler model recommendations based
on customer's specific design requirements.
110
3550
2400
1132
633
4" INLETS
4" OUTLETS
C
H
INSTALLED
HEIGHT
ACCESS
2737
ACCESS
511
AIR INLET ELEVATION
SIDE ELEVATION
MODELS 7054L081 - 7054Q121
ALL MODELS
110
5378
C
H
INSTALLED
HEIGHT
2737
621
AIR INLET ELEVATION
MODELS 7055P081 - 7055R121
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Engineering Data : Schematic
/
/
8
Dimensions
Shipping Weight kg
Operating
Weight
kg
Motor
kW
Pump
kW
Model
Heaviest
H
C
Weight per Cell
Section
7054L081
7054M081
7054N081
7054P081
7054Q081
7054L101
7054M101
7054N101
7054P101
7054Q101
7054L121
7054M121
7054N121
7054P121
7054Q121
7055P081
7055Q081
7055R081
7055P101
7055Q101
7055R101
7055P121
7055Q121
7055R121
15
18.6
4172
813
1041
1270
22.4
2.2
2.2
2.2
5749
6351
6868
4105
2920
29.8
37.3
15
18.6
4400
4629
22.4
4658
5128
3472
3942
29.8
37.3
15
18.6
22.4
29.8
37.3
15 x 2
18.6 x 2
22.4 x 2
15 x 2
18.6 x 2
22.4 x 2
15 x 2
18.6 x 2
22.4 x 2
4172
4400
4629
813
1041
1270
3.7
3.7
3.7
8010
8847
9647
5558
6323
7088
8644
3921
5449
NOTE
1 Use this bulletin for preliminary layouts only. Obtain
current drawings from your Marley sales representative.
All table data is per cell.
2 Standard overflow is a 2" dia. F connection located
on the side of the collection basin. Makeup water
connection is a 1" dia. M connection located on the side
of the collection basin. Drain is a 2"F connection located
on the side of the collection basin.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Engineering Data : Schematic
/
/
9
Use this data for preliminary layouts only.
Obtain current drawing from your Marley sales
representative.
The UPDATE web-based selection software
MC Fluid Cooler model recommendations based
on customer's specific design requirements.
2980
1480
2680
110
772
4" INLETS
C
4" OUTLETS
H
INSTALLED
HEIGHT
ACCESS
2737
ACCESS
508
SIDE ELEVATION
AIR INLET ELEVATION
ALL MODELS
MODELS 7073M081 - 7073P121
110
5359
110
3683
C
H
INSTALLED
HEIGHT
2737
533
670
AIR INLET ELEVATION
AIR INLET ELEVATION
MODELS 7074N081 - 7074Q121
MODELS 7075Q081 - 7075T121
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Engineering Data : Schematic
/
/
10
Dimensions
Shipping Weight kg
Operating
Weight
kg
Motor
kW
Pump
kW
Model
Heaviest
H
C
Weight per Cell
Section
7073M081
7073N081
7073P081
7073M101
7073N101
7073P101
7073M121
7073N121
7073P121
7074N081
7074P081
7074Q081
7074N101
7074P101
7074Q101
7074N121
7074P121
7074Q121
7075Q081
7075R081
7075T081
7075Q101
7075R101
7075T101
7075Q121
7075R121
7075T121
18.6
22.4
4174
813
1041
1270
813
2.2
2.2
2.2
3.7
3.7
3.7
5.6
5.6
5.6
6190
6769
7351
7855
8598
9337
10986
11927
12852
4541
2930
29.8
18.6
4402
4613
4174
4402
4613
4174
4402
4613
22.4
5074
5608
5619
6299
6977
7674
8615
9451
3463
3997
3549
4229
4907
4769
5710
6546
29.8
18.6
22.4
29.8
22.4
29.8
37.3
22.4
1041
1270
813
29.8
37.3
22.4
29.8
37.3
18.6 x 2
22.4 x 2
29.8 x 2
18.6 x 2
22.4 x 2
29.8 x 2
18.6 x 2
22.4 x 2
29.8 x 2
1041
1270
NOTE
1 Use this bulletin for preliminary layouts only. Obtain
current drawings from your Marley sales representative.
All table data is per cell.
2 Standard overflow is a 11⁄2" dia. M connection located on
the side of the collection basin. Makeup water connection
may be 11⁄2" dia. M connection located on the side of the
collection basin. Drain is a 2"F connection located on the
side of the collection basin.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Engineering Data: Support
/
/
11
LENGTH
C
A
C
C
C
ANCHOR
BOLT
ANCHOR
BOLT
L
L
21
A
Model
7012
7013
7014
A
B
C
HOLES FOR
3/8" DIA. ANCHOR
1519
2432
BOLTS 4 REQD
1210
152
3343
7054
7055
7073
7074
7075
3510
5353
2640
3640
5320
B
2361
2931
24
21
SUPPORT
BY OTHERS
NORMAL
GAUGE
30
TOWER COLLECTION
BASIN- AIR INLET FACE
VIEW A
SUPPORTING STEEL
SINGLE CELL
NOTE
1 Use this bulletin for preliminary layouts only. Obtain
current drawings from your Marley sales representative
for final design.
3 Continuous beam required for entire length.
4 Fluid cooler may be placed on a flat concrete slab.
2 Purchaser to provide fluid cooler support complete with
holes and anchor bolts. Do not use studs! Anchor points
must be framed flush and level at top.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Engineering Data : Hoisting
/
/
12
B
A
80°MAX
D
C
Lower Module
B
Upper Module
D
Model
Weight
kg
Weight
kg
A
C
7012
7013
7014
7054
7055
7073
7074
7075
1422
2337
3302
1245
3073
2515
1295
2743
1143
1143
1143
2057
2057
2794
2642
2642
435
549
1600
2515
3429
3327
1753
2515
3531
5207
1143
1143
1143
2438
2438
2794
2794
2794
1320
1740
2175
3942
5450
3996
4908
6545
699
1186
1640
1610
2071
2905
NOTE
1 Hoisting operations can be dangerous and suitable safety
precautions should be taken to protect personnel and the
equipment being hoisted.
2 All hoisting equipment should be certified and comply with
local and national safety regulations.
3 Ensure that slings are of sufficient length so not to impose
bending loads onto the casing—use of spreader bars is
essential.
4 For overhead lifts or where additional safety is required,
add slings beneath the fluid cooler unit.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Engineering Data : Schematic : Attenuators
/
/
13
E
A
D
C
SIDE ELEVATION
AIR INLET ELEVATION
B
ALL MODELS
Dimensions
Model
Depth
A
B
C
D
E
610
1220
610
1824
1824
2735
2735
3648
3648
3550
3550
5202
5202
2680
2680
3680
3680
5359
5359
110 0
1700
110 0
1700
110 0
1700
110 0
1700
110 0
1700
110 0
1700
110 0
1700
110 0
1700
1113
1113
1113
1113
1113
1113
2121
2121
2121
2121
2121
2121
2121
2121
2121
2121
1126
1726
1126
1726
1126
1726
1126
1726
1126
1726
1126
1726
1126
1726
1126
1726
1251
1251
1251
1251
1251
1251
2400
2400
2400
2400
2980
2980
2980
2980
2980
2980
7012
7013
7014
7054
7055
7073
7074
7075
1220
610
1220
610
1220
610
1220
610
1220
610
1220
610
1220
NOTE
1 Attentuators will result in an additional external resistance
therefore the fan will be unable to deliver the same airflow
resulting in a small reduction in performance.
2 Critical noise applications must be referred to SPX Cooling
Technologies engineering.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Engineering Data: Freeze Prevention
/
/
14
Fluid Cooler Coil
Fluid Cooling Recirculating Water
When the ambient temperature falls below 0°C,
heat loss from the coil can be substantial even without
recirculating water flowing over the coil. The process
fluid, without an applied heat load, may be prone to
freezing. There are various methods to protect against
coil freezing.
When the ambient air temperature falls below 0°C,
the recirculating water within the fluid cooler can freeze.
Marley Technical Report #H-003 “Operating Cooling
Towers in Freezing Weather” describes how to
prevent freezing during operation. Ask your Marley sales
representative for a copy or download a copy at
spxcooling.com.
Ethylene and propylene glycol solutions are the
best means to protect against coil freezing and are
recommended for most installations. The appropriate
concentration of ethylene or propylene glycol should be
determined based on the required protection from low
ambient temperatures.
During shutdown, water collects in the basin and may
freeze solid. You can prevent freezing by adding heat to
the water left in the basin—or, you can drain the fluid
cooler and all exposed pipework at shutdown.
Electric Basin Heaters
If the use of an industrial antifreeze solution is not
compatible with the system, another accepted method
of preventing coil freezing is to maintain a sufficient flow
rate and heat load on the process fluid. The fluid exiting
the coil must be maintained at or above 7°C at the full
process flow rate. If the process load does not yield such
a heat load, it may be necessary to apply a supplementary
heat load to the process fluid.
An automatic basin water heater system, consisting of
the following components:
• Standard weatherproof (IP55) enclosure, rating
depending on model and minimum expected winter
temperature (see table below):
• Ratings are in kW for specified ambient temperature.
For lower ambient temperatures refer to SPX
engineering for advice.
Draining the coil is not considered to be an acceptable
means of protection against freezing. Introducing air to
the interior of the bundle will promote corrosion of the
heat exchanger coil. In an emergency, this alternative can
be used in the event that the process fluid drops below
7°C, the ambient temperature is below freezing and the
coils are not protected with industrial antifreeze.
• Standard electircal supply is 380/415 V 3ph (220/240V 1
ph available as extra cost option).
• Heater has an integral thermostat, set point nominally
3°C but adjustable to suit operating requirements.
The basin heater option is only for freeze protection
of the recirculation water in collection basin. The
basin heater option does not protect the coil during
freezing weather.
Cycling of the recirculating water pumps should not be
used to control process flow temperatures. Coils may be
used for seasonal dry operation followed by seasonal wet
operation, but not for frequent cycling of the recirculating
water pump. Such operation may lead to an excessive
scale buildup resulting in a decrease in efficiency.
Heater components are normally shipped separately
for installation by others.
Indoor StorageTank
With this type of system, water flows from an indoor
tank and back to the fluid cooler where it is cooled
and recirculated. The water flows by gravity from the
fluid cooler to the tank located in a heated space. At
shutdown, all exposed water drains into the tank where it
is safe from freezing.
CAUTION
Freezing ambient conditions could cause significant
damage to the heat exchanger coil of the MC Fluid
Cooler.To avoid possible damage, it is imperative to
provide for adequate freeze protection.
The amount of water needed to successfully operate
the system depends on the fluid cooler size and m3/hr
and on the volume of water contained in the piping
system to and from the fluid cooler. You must select a
tank large enough to contain those combined volumes—
plus a level sufficient to maintain a flooded suction on
your pump. Control makeup water according to the level
where the tank stabilizes during operation.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Engineering Data:Water Quality
/
/
15
The MC Fluid Cooler can be a very effective air
washer. Atmospheric dust able to pass through the
relatively small louver openings will enter the recirculating
water system. Increased concentrations can intensify
systems maintenance by clogging screens and
strainers—and smaller particulates can coat system heat
transfer surfaces. In areas of low flow velocity—such as
the collection basin—sedimentary deposits can provide a
breeding ground for bacteria.
CAUTION
The fluid cooler must be located at such distance
and direction to avoid the possibility of contaminated
discharge air being drawn into building fresh air intake
ducts.The purchaser should certify that the location
of the fluid cooler is in compliance with applicable air
pollution, fire and clean air codes.
In areas prone to dust and sedimentation, you should
consider installing some means for keeping the collection
basin clean. Typical devices include side stream filters
and a variety of filtration media.
Blowdown
WaterTreatment
Blowdown or Bleedoff is the continuous removal of
a small portion of the water from the open recirculating
system. Blowdown is used to prevent the dissolved
solids from concentrating to the point where they will
form scale. The amount of blowdown required depends
on the cooling range—the difference between the hot and
cold water temperatures of the closed circuit— and the
composition of the makeup water. The MC Fluid Cooler
is equipped with a blowdown line with metering valve
connected directly to the overflow. Specific blowdown
adjustment instructions and additional blowdown
information can be found in the MC Fluid Cooler
User Manual .
To control the buildup of dissolved solids resulting
from water evaporation, as well as airborne impurities and
biological contaminants including Legionella, an effective
consistent water treatment program is required. Simple
blowdown may be adequate to control corrosion and
scale, but biological contamination can only be controlled
with biocides.
An acceptable water treatment program must be
compatible with the variety of materials incorporated in
a fluid cooler—ideally the pH of the recirculating water
should fall between 6.5 and 9.0. Batch feeding of the
chemicals directly into the fluid cooler is not a good
practice since localized damage to the fluid cooler is
possible. Specific startup instructions and additional water
quality recommendations can be found in the
MC Fluid Cooler User Manual which accompanies the
fluid cooler and also is available from your local Marley
sales representative.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Specifications: Base
/
/
16
Specifications
Specification Value
1.0
1.1
Base:
■Your specification base establishes the type, configuration, base
material and physical limitations of the fluid cooler to be quoted.
During the planning and layout stages of your project, you will have
focused your attention on a fluid cooler selection that fits your space
allotment, and whose power usage is acceptable. Limitations on
physical size and total operating kW avoid the introduction of unfore-
seen operational and site-related influences. Specifying the number of
cells, and the maximum fan kW/cell will work to your advantage.
Furnish and install a forced-draft, coun-
terflow-type, factory assembled, film
fill, industrial duty, galvanized steel,
closed circuit fluid cooler. Unit shall
consist of _____ cell(s), as shown on
plans. The limiting overall dimensions
of the fluid cooler shall be _____ wide,
_____ long, and _____ high. Total oper-
ating kW of all fans shall not exceed
_____ kW, consisting of_____ @ _____
kW motor(s). Fluid cooler shall be simi-
lar and equal in all respects to Marley
Model _____________________.
The benefit of a forced-draft counterflow fluid cooler is that they
are inherently easy to operate, access and maintain. Forced-draft
counterflow fluid coolers have all mechanical equipment located at a
low level for easy access, and the water distribution system is acces-
sible by simply removing the lightweight drift eliminator panels
■ CTI Certification means that the fluid cooler has been tested under
operating conditions and found to perform as rated by the manufac-
turer under those circumstances. It
assures the buyer that the fluid cooler
is not intentionally or inadvertently
2.0
2.1
Thermal Performance:
Water as the heat transfer fluid.
The fluid cooler shall be capable of
cooling _____ m3/hr of water from
_____ °C to _____ °C at a design enter-
ing air wet-bulb temperature of _____
°C. Coil pressure drop shall not exceed
_____ kPa. The thermal performance
rating shall be Certified by the Cooling
Technology Institute.
undersized by the manufacturer.
2.1
Aqueous glycol solution as the heat
transfer fluid.
The fluid cooler shall be capable of
cooling _____ m3/hr of water from
_____ °C to _____ °C at a design enter-
ing air wet-bulb temperature of _____
°C. Coil pressure drop shall not exceed
_____ kPa. The thermal performance
rating shall be based on the Cooling
Technology Institute certified perfor-
mance rating adjusted for the thermal
properties of the aqueous glycol solu-
tion used.
3.0
3.1
Performance Warranty:
■ However, CTI certification alone is not sufficient to assure you that the
fluid cooler will perform satisfactorily in your situation. Certification
is established under relatively controlled conditions, and fluid coolers
seldom operate under such ideal circumstances.They are affected by
nearby structures, machinery, enclosures, effluent from other sources,
etc. Responsible and knowledgeable bidders will take such site-spe-
cific effects into consideration in selecting the fluid cooler—but the
specifier must insist by the written specification that the designer/
manufacturer guarantee this “real world” performance. Any reluc-
tance on the part of the bidder should cause you some concern.
CTI Certification notwithstanding, the
fluid cooler manufacturer shall guaran-
tee that the fluid cooler supplied will
meet the specified performance condi-
tions when the fluid cooler is installed
according to plan. If, because of a
suspected thermal performance defi-
ciency, the owner chooses to conduct
an on-site thermal performance test
under the supervision of a qualified,
disinterested third party in accordance
with CTI or ASME standards during the
first year of operation; and if the fluid
cooler fails to perform within the limits
of test tolerance; then the fluid cooler
manufacturer will pay for the cost of
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Specifications: Base
/
/
17
Specifications
Specification Value
the test and will make such corrections
as are appropriate and agreeable to the
owner to compensate for the perfor-
mance deficiency.
4.0
4.1
Coil:
■The MC Fluid Cooler
coil is suitable for cool-
ing water, oils and other
fluids compatible with
carbon steel in a closed,
pressurized system. Each
coil is constructed of all-
prime surface, continu-
Coil(s) shall consist of fully welded box
headers with serpentine coils and hot-dip
galvanized after fabrication. Coils shall
be tested to 2757 kPa air pressure while
immersed in water. Maximum operating
design pressure shall be 1551 kPa. The
coil shall be designed for free drainages
of fluid at shutdown.
ous steel tubing, formed
into a serpentine shape
5.0
5.1
Design Loading:
and welded into an assembly.The complete assembly is then hot-dip
galvanized after fabrication. Design pressure is 1551 kPa, and each coil
is tested to 2757 kPa air pressure under water.Tubes are sloped to pro-
vide free drainage when vented.
The fluid cooler and its components
shall be designed to withstand a wind
load of 1.44 kPa. The fluid cooler shall
be designed to withstand shipping
and hoisting loads of 2g horizontal or
3g vertical. Handrails, where specified
shall be capable of withstanding a 890
N concentrated live load in any direc-
tion and shall be designed in accor-
dance with OSHA guidelines.
■The indicated design values are the minimum allowables under
accepted design standards.They give you assurance that the fluid
cooler can be shipped, handled, hoisted—and ultimately operated in
a normal fluid cooler environment. Most MC Series models will with-
stand significantly higher wind and seismic loads. If your geographic
location dictates higher wind load or seismic load values, please
make the appropriate changes, after discussion with your Marley
sales representative.
6.0
6.1
Construction:
■ In the history of fluid coolers, no other coating for carbon steel has
exhibited the success and longevity of galvanization in exposure to
the normal fluid cooler water quality defined at left. No paints or
electrostatically-applied coatings, however exotic they may be, can
approach galvanization's history of success.
Except where otherwise specified, all
components of the fluid cooler shall
be fabricated of heavy-gauge steel,
protected against corrosion by G600
galvanizing. After passivation of the
galvanized steel (8 weeks at pH 7-8,
and calcium hardness and alkalinity at
100-300 mg/L each), the fluid cooler
shall be capable of withstanding water
having a pH of 6.5 to 9.0; a chloride
content up to 500 mg/L as NaCl (300
mg/L as Cl-); a sulfate content (as SO4)
up to 250 mg/L; a calcium content (as
CaCO3) up to 500 mg/L; silica (as SiO2)
up to 150 mg/L; and design operat-
ing ranges up to 10°C. The circulating
water shall contain no oil, grease, fatty
acids, or organic solvents.
If extended longevity of the fluid cooler is required—or unusually
harsh operating conditions are expected—consider specifying stain-
less steel as either the base construction material, or the material
utilized for specific components of your choice. See Stainless Steel
Options on page 17.
6.2
The specifications, as written, are
intended to indicate those materials
that will be capable of withstanding
the above water quality in continuing
service, as well as the loads described
in paragraph 4.1. They are to be
regarded as minimum requirements.
Where component materials unique
to individual fluid cooler designs are
not specified, the manufacturers shall
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Specifications: Base
/
/
18
Specifications
Specification Value
take the above water quality and load
carrying capabilities into account in the
selection of their materials of manufac-
ture.
7.0
7.1
Mechanical Equipment:
Fan(s) shall be forward curved cen-
trifugal-type, which are statically and
dynamically balanced. The fan impeller
is manufactured from galvanized steel,
blades are riveted to the center plate
and inlet rings and have stay rods to
ensure maximum concentricity and
rigidity. The stay rods are adjusted by
the manufacturer during the balancing
operation and require no field adjust-
ment. Fan(s) shall be driven through
one-piece, multi-groove, V-belt, pulleys,
and spherical roller bearings. Bearings
shall be rated at an L10 life of 50,000
hours, or greater. A hinged motor
adjustment plate with threaded ten-
sioning bolts shall be installed to allow
correct belt tensioning.
■The Marley drive system features all-aluminum sheaves (pulleys),
power band belts, and long-life bearings for dependable service.
To reduce cost, some manufacturers may useTEAO motors, whose
only source of cooling is the flow of air produced by the fluid cooler
fan.They are sometimes applied at kWs significantly beyond their
nameplate rating.
Unless otherwise specified, motor speed will be 1500 RPM, 50 Hertz
on standard models. If you prefer the operating flexibility of two-
speed operation, please specify two-speed, single-winding motors
which offer full and half speeds for maximum energy savings.
Incidentally, two speed motors are a far better choice than separate
“pony” motors which simply double the problems indicated above.
The value of a 5 year mechanical equipment warranty speaks for
itself.
7.2
Motor(s) shall be ____ kW maximum,
Totally Enclosed, 1.15 service fac-
tor, variable torque, and specially
insulated for fluid cooler duty. Speed
and electrical characteristics shall be
______ RPM, single-winding, 3 phase,
50 hertz, ____ volts. Motor shall oper-
ate in the shaft-horizontal position and
nameplate kW shall not be exceeded
at design operation
7.3
The complete mechanical equipment
assembly for each cell shall be sup-
ported by a rigid, galvanized steel
structural support that resists misalign-
ment between the motor and sheaves.
The mechanical equipment assembly
shall be warranted against any failure
caused by defects in materials and
workmanship for no less than five (5)
years following the date of fluid cooler
shipment. This warranty is limited to
the fan, fan shaft, bearings, sheaves
and mechanical equipment support.
The motor, motor components and
belt(s) are warranted by their manufac-
turer.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Specifications: Base
/
/
19
Specifications
Drift Eliminators:
Specification Value
8.0
8.1
■ Drift rate varies with design water loading and air rate, as well as drift
eliminator depth and number of directional changes.The indicated
rate of 0.005% is easily achievable without premium cost. If a lower
rate is required, please discuss with your Marley sales representative.
Drift eliminators shall be PVC, triple
pass and shall limit drift losses to no
more than 0.005% of the design water
flow rate.
9.0
9.1
Hot Water Distribution System:
■The combination of PVC piping and polypropylene nozzles is very
resistant to the build-up of scale and slime.
A pressured spray system shall distrib-
ute water evenly over the fill. Header
box shall be steel and branch arms
shall be PVC with polypropylene spray
nozzles attached to the branch arms by
an integral screw connection for ease
of removal and cleaning. The spray
system shall provide full coverage
of the coil at a flow rate sufficient to
ensure complete wetting of the coil at
all times.
10.0 Casing:
10.1 The casing shall be heavy gauge G-600
galvanized steel and shall be capable
of withstanding the loads described in
paragraph 5.1.
11.0 Access:
11.1 A large galvanized, rectangular access
door shall be located on both end
panels for entry into the cold water
basin. Rectangular panels are shall be
provided for access to the fan plenum
area to facilitate inspection and allow
maintenance to the fan drive system
12.0 Cold Water Collection Basin:
■The MC fluid cooler design offers side-suction as standard. Bottom
outlets may be supplied to accommodate a variety of piping schemes.
Unless so specified, the fluid cooler you may be asked to approve
may only be available with one type of suction connection requiring
you to redesign your piping layout.
12.1 The collection basin shall be heavy-
gauge galvanized steel and shall
include the number and type of suction
connections required to accommodate
the out-flow piping system shown on
the plans. Suction connections shall be
equipped with debris screens. A fac-
tory installed, float operated, mechani-
cal make-up valve shall be included. An
overflow and drain connection shall be
provided in each cell of the fluid cooler.
The basin floor shall slope toward the
drain to allow complete flush out of
debris and silt which may accumulate.
The sloping floor and low-level drain is valuable because it provides a
way to achieve flush-out cleanability.
13.0 Warranty:
13.1 The MC Fluid Cooler shall be free from
defects in materials and workmanship
for a period of eighteen (18) months
from the date of shipment.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Specifications: Options
/
/
20
Specifications
Specification Value
Stainless Steel Options
■The cold water basin is the only part of the fluid cooler that is subject
to periods of stagnant water, concentrated with treatment chemicals
and customary contaminants. It is also the most expensive and dif-
ficult part of any fluid cooler to repair or replace. For these reasons,
many customers—particularly those who are replacing older fluid
coolers—choose to specify stainless steel cold water basins.
Stainless Steel Collection Basin:
12.1: Replace paragraph 12.1 with the
following: The collection basin shall
be heavy-gauge Series 300 stainless
steel. Suction connections shall be
equipped with stainless steel debris
screens. A factory installed, float oper-
ated, mechanical make-up valve shall
be included. An overflow and drain
connection shall be provided in each
cell of the fluid cooler. The basin floor
shall slope toward the drain to allow
complete flush out of debris and silt
which may accumulate. All steel items
which project into the basin (anchor
clips, etc.) shall also be made of stain-
less steel.
■ For pure resistance to corrosion—coupled with the capability to meet
stringent fire and building codes—there is no substitute for stainless
steel. No paints or electostatically-applied coatings, however exotic
they may be, can match stainless steel's ability to withstand adverse
operating conditions.
All Stainless Fluid cooler
6.1
Replace paragraph 6.1 with the fol-
lowing: Except where otherwise spec-
ified, all components of the fluid cooler
shall be fabricated of heavy-gauge,
series 300 stainless steel. The fluid
cooler shall be capable of withstanding
water having a chloride content (NaCl)
up to 750 mg/L; a sulfate content (SO4)
up to 1200 mg/L; a calcium content
(CaCO3) up to 800 mg/L; silica (SiO2)
up to 150 mg/L; and design operat-
ing ranges up to 10°C. The circulating
water shall contain no oil, grease, fatty
acids, or organic solvents.
■ For process fluids that are not compatible with the standard galva-
nized steel construction, stainless steel offers you the ultimate in cor-
rosion resistance and long life.The thermal performance rating shall
be based on the CoolingTechnology Institute certified performance
rating adjusted for the thermal properties of stainless steel.
4.1
Replace paragraph 4.1 with the fol-
lowing: Coil(s) shall consist of fully
welded box headers with serpentine
coils. All coil components shall be
assembled from series 300 stainless
steel. Coils shall be tested to 2757
kPa air pressure while immersed in
water. Maximum operating design pres-
sure shall be 1551 kPa. The coil shall be
designed for free drainages of fluid at
shutdown.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Specifications: Options
/
/
21
Specifications
Specification Value
Convenience and Safety Options
Top Access Platform:
■ Periodic inspection and maintenance of a fluid cooler distribution
system is fundamental to preserving maximum cooling system effi-
ciency. All fluid coolers—crossflow or counterflow—are subject to
clogging to varying degrees by waterborne contaminants such as
pipe scale and sediment.Therefore, safe and easy access to these
components is of significant value to the operator.
11.2 Add the following paragraph in
the Access section: There shall be
an access platform at the top of the
fluid cooler to allow access to the drift
eliminators and distribution system.
The platform shall be free-standing
galvanized steel bar grating, sup-
ported by galvanized steel framework.
The platform shall be surrounded by
a handrail, kneerail, and toeboard
designed according to meet local
safety requirements. Handrails and
kneerails shall consist of 42mm O.D. x
15 gauge galvanized structural tubing,
the handrail of which shall be capable
of withstanding a 890 N concentrated
live load in any direction. Posts are
51mm x 51mm square structural tub-
ing and shall be spaced on centers of
2.44m or less. A ladder shall be per-
manently attached to the platform and
to the casing of the fluid cooler, rising
from the base of the fluid cooler to the
top of the handrail.
Access can be provided in a number of ways, including portable
ladders or scaffolding, but for maximum safety and convenience, a
field installed Marley access platform with guardrails is available to
make this task as safe and user-friendly as possible. Further, its loca-
tion on the side of the fluid cooler does not add to the height of the
unit, preserving architectural integrity. It also saves the owner time
and money, in that maintenance personnel may devote their time to
inspection rather than searching for ladders or erection of portable
scaffolding.
Ladder Extension:
■ Many fluid coolers are installed such that the base of the unit is
600mm or more above the roof or grade level.This makes it difficult
to get up to the foot of the attached ladder.The ladder extension alle-
viates this problem. Marley ladder extensions are available in stan-
dard 1524mm and 3353mm lengths.
11.2 Add the following to the end of
paragraph 11.2: Provide a ladder
extension for connection to the foot
of the ladder. This extension shall
be long enough to rise from the roof
(grade) level to the base of the fluid
cooler. The installing contractor shall
be responsible for cutting the ladder to
length; attaching it to the foot of the
fluid cooler ladder; and anchoring it at
its base.
Ladder Safety Cage:
11.3 Add the following paragraph in the
Access section: A heavy gauge galva-
nized steel safety cage shall surround
the ladder, extending from a point
approximately 2150mm above the foot
of the ladder to the top of the handrail.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Specifications: Options
/
/
22
Specifications
Specification Value
■ Where fluid coolers are installed on an elevated grillage or piers, it is
often difficult to get to—and through—the access door conveniently.
This platform provides easy, safe and comfortable access to that door.
Access Door Platform:
11.4 Add the following paragraph in the
Access section: There shall be an
access platform at the base of the fluid
cooler extending across the width of
the casing. The platform shall be gal-
vanized steel bar grating, supported by
galvanized steel framework attached to
the fluid cooler. The platform shall be
surrounded by a handrail, kneerail, and
toeboard.
■This platform provides easy, safe and comfortable access to the
access door facilitating inspection of the fill, distribution nozzles and
the underside of the drift eliminators.
Distribution System Access Door
Platform:
10.5 Add the following paragraph in the
Access section: There shall be an
access platform at the level of the
distribution system access door. The
platform shall be galvanized steel bar
grating, supported by free-standinggal-
vanized steel framework attached to
the fluid cooler. The platform shall be
surrounded by a handrail, kneerail, and
toeboard.
Control Options
Control System:
■ If it is your opinion that the control system for the fluid cooler be part
of the fluid cooler manufacturer’s responsibility, we are in whole-
hearted agreement with you. Who better to determine the most effi-
cient mode and manner of a fluid cooler’s operation—and to apply a
system most compatible with it—than the designer and manufacturer
of the fluid cooler?
6.4
Add the following paragraph in the
Mechanical Equipment section: The
fluid cooler shall be equipped with a
UL 508 control system in a IP14 or
IP56 outdoor enclosure capable of
controlling single-speed or two-speed
motors as required, and designed
specifically for fluid cooler applications.
The panel shall include a main fused
disconnect with an external operating
handle, lockable in the off position for
safety. Across-the-line magnetic start-
ers as required shall be controlled with
a solid state temperature controller.
Door mounted selector switches shall
be provided to enable automatic or
manual control and wired for 120VAC
control. Control circuit to be wired out
to terminal blocks for field connection to
remote vibration switches. The tempera-
ture controller shall be adjustable for
the required process temperature. The
temperature controller will display two
temperatures, one for process
Marley variable speed drives are
also available for the ultimate
in temperature control, energy
management and mechanical
equipment longevity.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Specifications: Options
/
/
23
Specifications
Specification Value
temperature at the coil and the other
for set point. Process temperature input
shall be obtained using a thermal sens-
ing device on the process coil and wired
back to the solid state temperature
controller in the control panel. Staging
of multiple motors and speeds will be
accomplished with an integral PLC.
■ Unless specified otherwise, a Fire
Fighting Enterprises switch will be provid-
ed. A double-pole, double-throw model
is also available.The requirement for
manual reset assures that the fluid cooler
will be visited to determine the cause of
excess vibration.
Vibration Limit Switch:
6.5
Add the following paragraph in the
Mechanical Equipment section: A
single-pole, double-throw vibration
limit switch in a IP55 housing shall be
installed on the mechanical equipment
support for wiring into the owner’s
control panel. The purpose of this
switch will be to interrupt power to the
motor in the event of excessive vibra-
tion. It shall be adjustable for sensitiv-
ity, and shall require manual reset.
■The Marley basin heater components described at left represent our
recommendation for a reliable automatic system for the prevention of
basin freezing.They are normally shipped separately for installation at
the jobsite by the installing contractor. When purchased in conjunction
with the enhanced Control System option, however, they are customar-
ily factory-mounted and tested.
Basin Heater:
11.2 Add the following paragraph in the
Cold Water Basin section: Provide
an electric immersion heater for each
cell of the fluid cooler to prevent freez-
ing of water in the collection basin
during periods of shutdown. The rod
type heater is installed in the side of
the cold water basin. Each heater will
include an integral thermostat, set
point nominally 4°C but adjustable to
suit local operating requirements.
Submerged in basin water, in which zinc ions are present, copper
immersion heaters must not be used. Insist upon stainless steel.
The ambient air temperature that you insert in the specifications
should be the lowest 1% level of winter temperature prevalent at site.
Fan Motor Variable Speed Drive:
■ Marley VFD drive systems are designed to combine absolute tem-
perature control with ideal energy management.The fluid cooler user
selects a cold water temperature and the drive system will vary the
fan speed to maintain that temperature. Precise temperature control
is accomplished with far less stress to the mechanical equipment
components.The improved energy management provides fast pay-
back.
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
IP10 indoor, IP52 indoor or IP14 outdoor
enclosure shall be provided. The VFD
shall use PWM technology with IGBT
switching and integrated bypass design.
VFD out put switching shall not cause
mechanical issues with gearbox teeth
or drive shafts. The VFD shall catch a fan
spinning in the reverse direction without
tripping. The panel shall include a main
disconnect with short circuit protection
and external operating handle, lockable
➠
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Specifications: Options
/
/
24
Specifications
Specification Value
in the off position for safety. The VFD
system shall receive a speed reference
signal from the Building Management
System monitoring the tower fluid tem-
perature. As an option to receiving the
speed reference signal from a building
management system, the drive must
have the capability to receive a 4-20 ma
temperature signal from an RTD trans-
mitter. The VFD shall have an internal PI
regulator to modulate fan speed main-
taining 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 mag-
netic 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.
Once the motor is transferred to the by-
pass circuit the fan motor will run at con-
stant full speed. The bypass circuit will
not modulate ON and OFF based on fluid
temperature. The application must be
able to handle very cold fluid tempera-
tures while the VFD is in a by-pass mode.
Operator controls shall be mounted on
the front of the enclosure and shall con-
sist of start and stop control, bypass/VFD
selection, Auto/Manual selections, manu-
al speed control. To prevent heating prob-
lems in the fluid cooloer fan motor and
to assure proper gear reducer lubrication
the VFD system shall de energize the
motor once 25% motor speed is reached
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 natu-
ral frequency vibration levels which may
exceed CTI guidelines.
Marley Premium VFD System
6.4
Add the following paragraph in the
Mechanical Equipment section when
VFD is used as a stand alone system:
A complete UL listed Variable Speed
Drive system in a IP52 indoor or IP14
outdoor enclosure shall be provided. The
VFD shall use PWM technology with
IGBT switching and integrated bypass
design. VFD output switching shall not
cause mechanical issues with gearbox
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Specifications: Options
/
/
25
Specifications
Specification Value
teeth or drive shafts. The VFD shall catch
a fan spinning in the reverse direction
without tripping. The panel shall include
a main disconnect with short circuit pro-
tection and external operating handle,
lockable in the off position for safety.
The system shall include a solid state,
PI temperature controller to adjust fre-
quency output of the drive in response
to the tower fluid temperature. The
temperature of the fluid and 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.
The bypass contactor shall be cycled
on and off while operating in bypass, to
maintain the set-point temperature of
the fluid. The drive design shall be oper-
ated as a stand-alone system without
the need for a BMS system. Operator
controls shall be mounted on the front of
the enclosure and shall 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.
To prevent heating problems in the fluid
cooler fan motor and to assure proper
gear box lubrication the VFD system
shall de energize the motor once 25%
motor speed is reached and cooling is
no longer required. The VFD shall include
de-icing logic with auto canceling and
adjustable time. Speed in De-Ice mode
shall not exceed 50% motor speed. The
fluid cooler manufacturer shall supply
VFD start-up assistance. Tower vibration
testing throughout the speed range is
required to identify and lockout any natu-
ral frequency vibration levels which may
exceed CTI guidelines.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Specifications: Options
/
/
26
Specifications
Specification Value
Miscellaneous Options
Sound Control
■ Sound produced by a standard MC Fluid Cooler operating in an
unobstructed environment will meet all but the most restrictive noise
limitations—and will react favorably to natural attenuation. Where the
fluid cooler has been sized to operate within an enclosure, the enclo-
sure itself will have a damping effect on sound. Sound also declines
with distance—by about 5 or 6 dB(A) each time the distance doubles.
Where noise at a critical point is likely to exceed an acceptable limit,
you have several options—listed below in ascending order of cost
impact:
1.2
Add the following paragraph
under Base: The fluid cooler
shall be quiet operation, and
shall produce an overall level of
sound not higher than _______
dB(A) measured at the critical
location indicated on the plans.
• Where only a slight reduction in noise will satisfy—and the source
of concern is in a particular direction—merely turning the fluid cooler
may be the answer. Less sound emanates from the cased face of the
fluid cooler than does from the air intake face.
• In many cases, noise concerns are limited to night time, when ambi-
ent noise levels are lower and neighbors are trying to sleep.You can
usually resolve these situations by using two speed motors in either
full/half speed or full/ 2⁄3 speed configuration, and operating the fans at
reduced speed without cycling “after hours”. (The natural night time
reduction in wet-bulb temperature makes this a very feasible solution
in most areas of the world, but the need to avoid cycling may cause
the cold water temperature to vary significantly.)
• Variable speed drives automatically minimize the fluid cooler's noise
level during periods of reduced load and/or reduced ambient with-
out sacrificing the system's ability to maintain a constant cold water
temperature.This is a relatively inexpensive solution, and can pay for
itself quickly in reduced energy costs.
• Where noise is a concern at all times (for example, near a hospital),
the best solution is to oversize the fluid cooler so it can operate con-
tinuously at reduced (2⁄3 or ½) motor speed even at the highest design
wet-bulb temperature.Typical sound reductions are 7 dB(A) at 2⁄3 fan
speed or 10 dB(A) at ½ fan speed, but larger reductions are often pos-
sible.
•The most extreme cases may require inlet and discharge sound
attenuator sections—however, the static pressure loss imposed by
discharge attenuators may necessitate an increase in fluid cooler size.
Two stages of inlet or discharge attentuators supported by the fluid
cooler and designed and tested for the most stringent requirements
are available as an option. See page 13.
The advantage is yours.You now have the choices you need to bal-
ance your project’s performance, space and cost requirements with
your sound level needs for a win-win solution to your cooling system
design.Your Marley sales representative will be able to help you meet
your sound requirements.
Download from Www.Somanuals.com. All Manuals Search And Download.
Marley MC Fluid Cooler Specifications: Options
/
/
27
Specifications
Specification Value
■ Where a fluid cooler is installed in a building well or there are high
surrounding walls, it is possible that a proportion of the hot and
humid discharge air will be drawn back into the fans thus increasing
the inlet wet bulb temperature with detriment to the fluid cooler per-
formance.
Discharge Hood:
6.4
Add the following paragraph
to the Mechanical Equipment
Section: There shall be a galva-
nized steel tapered duct on the
discharge side of the fluid cooler.
Drift eliminators shall be reposi-
tioned into the lower section of
the duct.
The tapered discharge duct is intended to increase the exit velocity
by up to 70% in order to reduce the effects of recirculation in some
installations. Experience and sound judgement should be exercised to
determine when and if a duct is required.
If the surrounding walls are much higher than the fluid cooler dis-
charge height, then extensions to the tapered duct may be installed.
Download from Www.Somanuals.com. All Manuals Search And Download.
GREGORY'S BANK
WORCESTER WR3 8AB
UNITED KINGDOM
44 (0) 1905 720 200
spxcooling.com
In the interest of technological progress,
all products are subject to design and/or
material change without notice.
©2008 SPX Cooling Technologies
uk_MCF-TS-08A
Download from Www.Somanuals.com. All Manuals Search And Download.
|