PT2
Cooling Towers
Cooling Towers
Product Detail
Product Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D63
Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D65
Construction Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D67
Custom Features & Options . . . . . . . . . . . . . . . . . . . . . . . . . . . .D70
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D73
Engineering Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D74
Structural Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D79
Engineering Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D81
Engineering Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . .D105
D62
Spotlight
D63
EVERTOUGH™ Construction
TriArmor® Corrosion Protection System
IBC Compliant
Single Piece Lift
Easy Maintenance
Containerized Unit
D64
Benefits
Optimal Footprint For Low Tonnage Applications
PT2
• Induced draft counterflow technology
• High efficiency PVC fill
• Ideal for replacement applications
Low Energy Consumption
• Evaporative cooling equipment minimizes the energy consumption of the entire system because it
provides lower condensing water temperatures. Owners save money while conserving natural
resources and reducing environmental impact.
• Motors – Premium efficient/VFD duty fan motors are standard.
Low Installed Cost
• Modular Design – All PT2 models ship in multiple sections
to minimize the size and weight of the heaviest lift, allowing
for the use of smaller, less costly cranes.
• InterLok™ System – Upper section self aligns with
lower section for quick field assembly.
• Platforms – Optional platform and ladder systems are
factory-preassembled and ready to install.
• Packaging – All motors are pre-installed and aligned at the
factory (See “Externally mounted motor” section on
page D69 for details).
External Motor Adjustment
• Support Steel – Units are designed to mount directly on
the existing support steel of many cooling towers
(both crossflow and counterflow).
• Containerized for Export – Specially designed to fit in
standard shipping containers.
Easy Maintenance
• Inward Sliding Access Door – Provides safe and easy
access to the water distribution and fan drive systems.
• External Motor Adjustment – All belt-drive PT2 models
have externally accessible motor adjustors with built in
locking wrench for easy motor alignment and belt tensioning.
BranchLok™ Removal System
• BranchLok™ Removal System – Branch removal system that requires no tools.
D65
Baltimore Aircoil Company
Easy Maintenance
• External Header Cleanout – Easily accessible cleanout port flushes any water distribution
debris to the outside of the unit.
• Sectional Louvers – Each louver section is easily removed without tools, offering quick access to
any part of the cold water basin.
• Fill Inspection Panel – Optional removable inspection panels allow for easy inspection and
access to the fill.
Long Service Life
• Materials of Construction – Multiple materials, including
the revolutionary TriArmor® Corrosion Protection
System and exclusive EVERTOUGH™ Construction are
available to meet the corrosion resistance, unit operating
life, and budgetary requirements of any project.
Cooling Towers
• External Platform – Optional external platforms and ladders are available for improved accessibility.
• InterLok™ System – Alleviates the need for butyl tape
during installation, providing a permanent leak-free joint
between the upper and lower sections.
• Bearing Life – L10 80,000 hour rated bearings.
Fill Inspection Panels
IBC 2006 Compliant
• Designed to meet requirements of 2006
International Building Code (IBC) covering
most US seismic applications in addition to
withstanding wind loads up to 130 psf.
• Product verified using seismic testing at certified
independent dynamic testing laboratory to meet
stringent 2006 IBC requirements.
PT2 Cooling Tower Seismic Testing
...because temperature matters™
D66
PT2
Construction Details
3
8
2
4
5
6
1
7
D67
Baltimore Aircoil Company
1
Heavy-Duty Construction
5
• Highest rated standard fill for all induced draft
steel panels
counterflow products on the market
• Polyvinyl chloride (PVC)
• Designed to meet requirements of 2006
• Impervious to rot, decay and biological attack
International Building Code (IBC)
• Base structure withstands higher seismic
loading than any other induced draft counter
flow tower on the market
• Flame spread rating of 5 per ASTM E84
6
2
BALTIDRIVE® Power Train
Sectional Air Inlet
Louver System
• Corrosion resistant
(except direct drive model PT2-0412)
• Maintenance free
• Premium quality, solid backed, multi-groove belt
• Corrosion resistant cast aluminum sheaves
Cooling Towers
• G-235 (Z700 Metric) hot-dip galvanized
140°F Standard Fill
• UV-resistant finish
• Easy to remove sections
• Heavy-duty bearings (L10 80,000 hour rating)
• Premium efficient/VFD duty
motors are standard
7 Cold Water Basin
• 5-year motor and drive warranty
• Sloped for easy cleaning
• Extended lubrication lines
• Suction strainer with removable
anti-vortex hood
3
• Adjustable water make-up assembly
Low HP Axial Fan
• High efficiency
8 Access
• Quiet operation
• Inward sliding door
• Corrosion resistant
• Permanently attached to the unit
4
Water Distribution
System
• Exclusive BranchLok™ Removal System
for tool free branch removal
• External header cleanout port
• Schedule 40 PVC spray header and branches
• Large orifice, non-clog nozzles
• Nozzles grommetted for easy removal
...because temperature matters™
D68
PT2
Fan Drive Configurations
The fan drive system provides the cooling air necessary to reject unwanted heat from the system to the
atmosphere. The standard fan drive system on the PT2 (except direct drive model PT2-0412A) is the
BALTIDRIVE® Power Train. This BAC engineered drive system consists of a specially designed
powerband and two cast aluminum sheaves located on minimum shaft centerline distances to
maximize belt life. A premium efficient cooling tower duty fan motor provides maximum performance for
cooling tower service, and is backed by BAC's comprehensive 5-year motor and fan drive warranty.
Direct Drive Dual Motors
(model PT2-0412A)
A direct drive dual motor system is provided on this
cooling tower. The motors are shipped factory
mounted, alleviating the need for field installation.
Direct Drive Motor
Externally Mounted Motor
(models model PT2-0709A, PT2-0809A and PT2-0812A)
The BALTIDRIVE® Power Train is provided on these cooling
towers. The motor is pre-installed to the base and aligned at the
factory. The assembly is shipped inside the cold water basin, for
fast field installation.
Externally Mounted Motor
Internally Mounted Motor
(models PT2-1009A, PT2-1012A and PT2-1212A)
The BALTIDRIVE® Power Train is provided on these
cooling towers. The motor ships factory mounted, aligned
and tensioned, alleviating the need for field installation.
Internally Mounted Motor
D69
Baltimore Aircoil Company
Custom Features and Options
Construction Options
• Standard:
• Optional TriArmor® Corrosion Protection System:
The cold water basin can be constructed with the TriArmor® Corrosion Protection System. The
system consists of a heavy-gauge G-235 hot-dip galvanized steel substrate encapsulated in a special
thermosetting hybrid polymer finish further protected by a polyurethane liner applied to all submerged
surfaces of the cold water basin. The basin is leak tested at the factory and warranted against leaks
and corrosion for 5 years.
• Optional EVERTOUGH™ Construction:
The EVERTOUGHTM Construction option combines BAC’s exclusive thermosetting hybrid polymer and
TriArmor® Corrosion Protection Systems to provide the best value in corrosion protection for most
water chemistries. All heavy-gauge G-235 galvanized steel panels and structural members are
protected with a thermosetting hybrid polymer. The cold water basin is constructed with the TriArmor®
Corrosion Protection System. The basin is leak tested at the factory and warranted against leaks and
corrosion for 5 years. Each cooling tower provided with EVERTOUGH™ Construction is backed by a
comprehensive Louver-to-LouverSM five-year warranty, which covers ALL components from the fan to
the cold water basin, from louver to louver, including the motor.
Cooling Towers
All steel panels and structural members are constructed of heavy-gauge G-235 (Z700 metric) hot-dip
galvanized steel. The air inlet louvers are constructed of PVC and are individually removable
without tools.
• Optional Thermosetting Hybrid Polymer:
The thermosetting hybrid polymer coating used to extend equipment life is applied to selected hot-dip
galvanized steel components of the cooling tower. This finish has been tested to withstand 6000
hours in a 5% salt spray without blistering, chipping, or loss of adhesion.
• Optional Stainless Steel Cold Water Basin:
The cold water basin can be constructed of Type 304 stainless steel. All factory seams in the cold
water basin are welded to ensure watertight construction and warranted against leaks for 5 years.
• Optional All Stainless Steel Construction:
Panels and structural elements are constructed of Type 304 stainless steel. All factory seams in the
cold water basin are welded to ensure watertight assembly and warranted against leaks. The basin is
leak tested at the factory and all factory seams are warranted against leaks for 5 years.
• Rated in accordance with IBC regulations to meet Seismic and Wind Loadings:
Standard construction and optional construction with structural bracing is designed to meet
requirements of International Building Code covering most US seismic applications in addition to
withstanding wind loads up to 130 psf.
...because temperature matters™
D70
Custom Features and Options
PT2
Low Sound Operation
The low sound levels generated by PT2 Cooling Towers make them suitable for installation in most
environments. For sound sensitive installations, the PT2 is available with a low sound fan that
significantly reduces the sound levels generated from the tower with minimal impact on thermal
performance (low sound fan are not available on Model PT2-0412A). The cooling tower thermal
performance with the low sound fan has been certified in accordance with CTI Standard STD-201. For
sound sensitive installations, factory designed, tested and rated water silencers and discharge sound
attenuation are also available for PT2 Cooling Towers. For more information on sound, see page M128.
Accessories
Inclined Ladder
In the event the owner requires access to the mechanical
plenum, but does not require a working surface, the PT2 can
be furnished with an inclined ladder – a 75º angled ladder –
extending from grade to the access door, providing safe access
with minimal space requirements. All components are designed
to meet OSHA requirements.
Inclined Ladder
External Service Platform, Ladder,
Safety Cage, and Gate
For external service, an access door platform can be added to
the cooling tower when the unit is purchased or as an
aftermarket upgrade. Ladders, safety cages, and safety gates
are also available. All components meet OSHA requirements.
External Platform
Vibration Cutout Switch
A factory mounted vibration cutout switch is available to
effectively protect against equipment failure due to excessive
vibration of the mechanical equipment system. BAC can provide
either a mechanical or solid-state electronic vibration cutout
switch in a NEMA 4 enclosure to ensure reliable protection.
Additional contacts can be provided on either switch type to
activate an alarm.
Vibration Cutout Switch
D71
Baltimore Aircoil Company
Basin Heaters
Cooling towers exposed to below freezing ambient temperatures require protection to prevent freezing of
the water in the cold water basin when the unit is idle. Factory-installed electric immersion heaters, which
maintain +40°F (4.4°C) water temperature, are a simple and inexpensive way of providing such
protection.
0°F (-17.8°C) Ambient Heaters
kW per Heater
-20°F(-28.9°C) Ambient Heaters
kW per Heater
PT2-0412A
6
6
PT2-0709A
6
8
PT2-0809A
8
10
PT2-1009A
8
10
PT2-0812A
10
12
PT2-1012A
10
14
PT2-1212A
12
16
Model Numbers
Note: The table data is based on 460 Volt/3 phase/60 Hz power and standard, single-cell unit configuration
Cooling Towers
Heater kW Data
Electric Water Level Control Package
The electric water level control replaces the standard mechanical make-up valve when more precise
water level control is required. This package consists of a conductance-actuated level control mounted in
the basin and a solenoid activated valve in the
make-up water line. The valve is slow closing to
minimize water hammer.
High Temperature Fill
If operation above 140°F (60.0°C) is anticipated,
an optional high temperature fill material is
available which increases the maximum allowable
entering water temperature to 150°F (65.6°C).
Factory Mutual Approval
PT2 Cooling Towers are available with Factory
Mutual (FM) Approved construction as an option.
Electronic Water Level Control
...because temperature matters™
D72
Accessories
PT2
Equipment Controls
BAC control panels are specifically designed to work seamlessly with all BAC units and engineered to
meet your particular application. A terminal box is available on all internal motor PT2 Cooling Towers
(not available on models PT2-0709, 0809, 0812) and includes a factory-mounted enclosure, factory
wiring to terminal blocks for the fan motors, and vibration cut out switch, and grounding lugs. For more
information on BAC Equipment Controls, refer to section K.
Basin Sweeper Piping
Provides an effective method of preventing sediment from collecting in the cold water basin of the tower.
A complete piping system, including nozzles, is provided in the tower basin to connect to side stream
filtration equipment (by others). For more information on filtration systems, refer to page M163.
Containerized For Export
Over 400 Tons in a single 40' Shipping Container
• Engineered for:
- The worldwide export market
- Maximum capacity
- Designed to fit a single unit in a
20' container
- Designed to fit two units in a
40' container
- Easy maintenance
- Reliability
- Lowest Shipping Costs!
Units are factory assembled and
require only minimal assembly
and rigging!
Single Unit in 20’ Container
Easy Removal and Assembly
D73
Baltimore Aircoil Company
Engineering Data
Do not use for construction. Refer to factory certified dimensions. This supplement includes data current
at the time of publication, which should be reconfirmed at the time of purchase. Up-to-date engineering
data, free product selection software, and more can be found at www.BaltimoreAircoil.com.
1 Cell
2 Cell
3 Cell
4 Cell
Model Number
Airflow
Per Cell
(CFM)
Nominal
Tonnage2
Motor Quantity and
HP
Nominal
Tonnage2
Motor Quantity and
HP
Nominal
Tonnage2
Motor Quantity and
HP
Nominal
Tonnage2
Motor Quantity and
HP
PT2-0412A-1H*
PT2-0412A-2J*
30,750
33,520
117
149
(2) 5
(2) 7.5
-
-
-
-
-
-
PT2-0709A-1K*
PT2-0709A-2L*
PT2-0709A-3L*
43,910
46,500
43,520
157
199
210
(1) 10
(1) 15
(1) 15
316
400
423
(2) 10
(2) 15
(2) 20
481
606
640
(3) 10
(3) 15
(3) 20
-
-
PT2-0809A-1K*
PT2-0809A-2L*
PT2-0809A-3M*
47,000
50,340
51,820
168
215
250
(1) 10
(1) 15
(1) 20
338
433
503
(2) 10
(2) 15
(2) 20
514
656
761
(3) 10
(3) 15
(3) 20
-
-
PT2-0812A-1M*
PT2-0812A-2N*
PT2-0812A-3O*
74,360
73,720
72,490
265
315
350
(1) 20
(1) 25
(1) 30
536
635
704
(2) 20
(2) 25
(2) 30
816
963
1,066
(3) 20
(3) 25
(3) 30
-
-
PT2-1009A-1L*
PT2-1009A-2M*
PT2-1009A-3N*
62,510
62,860
76,360
223
268
301
(1) 15
(1) 20
(1) 25
446
537
602
(2) 15
(2) 20
(2) 25
679
814
911
(3) 15
(3) 20
(3) 25
901
1,082
1,211
(4) 15
(4) 20
(4) 25
PT2-1012A-1M*
PT2-1012A-2O*
PT2-1012A-3O*
81,730
86,260
80,690
292
368
389
(1) 20
(1) 30
(1) 30
586
740
781
(2) 20
(2) 30
(2) 30
890
1,120
1,182
(3) 20
(3) 30
(3) 30
1,173
1,481
1,564
(4) 20
(4) 30
(4) 30
PT2-1212A-1N*
PT2-1212A-2O*
PT2-1212A-3P*
101,160
101,190
104,080
361
432
502
(1) 25
(1) 30
(1) 40
721
863
1,004
(2) 25
(2) 30
(2) 40
1,092
1,305
1,515
(3) 25
(3) 30
(3) 40
1,441
1,726
2,007
(4) 25
(4) 30
(4) 40
Cooling Towers
Performance Data
Notes
1. * Indicates number of cells
2. Nominal tons of cooling represents 3 GPM of water from 95°F to 85°F at a 78°F entering wet-bulb temperature.
Notes (For page D75):
1: *Data corresponds to all available motors for this model
2: Operating weight is based on the water level in the cold water basin at overflow height. If a lower operating
weight is needed to meet design requirements, your local BAC Representative can provide additional assistance.
...because temperature matters™
D74
Dimensional Data
Nominal Weights (lbs)
PT2
Model
Number1
D75
PT2-0412A-1*1
PT2-0412A-2*1
PT2-0709A-1*1
PT2-0709A-2*1
PT2-0709A-3*1
PT2-0709A-1*2
PT2-0709A-2*2
PT2-0709A-3*2
PT2-0709A-1*3
PT2-0709A-2*3
PT2-0709A-3*3
PT2-0809A-1*1
PT2-0809A-2*1
PT2-0809A-3*1
PT2-0809A-1*2
PT2-0809A-2*2
PT2-0809A-3*2
PT2-0809A-1*3
PT2-0809A-2*3
PT2-0809A-3*3
PT2-0812A-1*1
PT2-0812A-2*1
PT2-0812A-3*1
PT2-0812A-1*2
PT2-0812A-2*2
PT2-0812A-3*2
PT2-0812A-1*3
PT2-0812A-2*3
PT2-0812A-3*3
PT2-1009A-1*1
PT2-1009A-2*1
PT2-1009A-3*1
PT2-1009A-1*2
PT2-1009A-2*2
PT2-1009A-3*2
PT2-1009A-1*3
PT2-1009A-2*3
PT2-1009A-3*3
PT2-1009A-1*4
PT2-1009A-2*4
PT2-1009A-3*4
PT2-1012A-1*1
PT2-1012A-2*1
PT2-1012A-3*1
PT2-1012A-1*2
PT2-1012A-2*2
PT2-1012A-3*2
PT2-1012A-1*3
PT2-1012A-2*3
PT2-1012A-3*3
PT2-1012A-1*4
PT2-1012A-2*4
PT2-1012A-3*4
PT2-1212A-1*1
PT2-1212A-2*1
PT2-1212A-3*1
PT2-1212A-1*2
PT2-1212A-2*2
PT2-1212A-3*2
PT2-1212A-1*3
PT2-1212A-2*3
PT2-1212A-3*3
PT2-1212A-1*4
PT2-1212A-2*4
PT2-1212A-3*4
Heaviest
Operating2 Shipping Section
5,260
5,500
6,030
6,320
6,610
12,180
12,760
13,350
18,450
19,330
20,580
6,700
7,000
7,300
13,550
14,140
14,740
20,530
21,420
22,710
8,410
8,740
9,060
17,010
17,650
18,300
25,782
26,743
28,084
7,790
8,100
8,410
15,730
16,350
16,980
23,836
24,763
26,070
31,976
33,344
35,087
10,120
10,530
10,930
20,450
21,260
22,060
30,987
32,192
33,891
41,568
43,347
45,613
11,210
11,760
12,310
22,550
23,670
24,770
34,044
35,704
37,364
45,541
47,754
49,967
2,850
3,090
3,270
3,560
3,850
6670
7,250
7,840
10,180
11,060
12,310
3,520
3,820
4,120
7,180
7,780
8,380
10,980
11,880
13,150
4,170
4,490
4,810
8,520
9,160
9,810
13,043
14,005
15,346
4,100
4,410
4,720
8,350
8,970
9,600
12,764
13,691
14,998
17,213
18,581
20,324
5,330
5,730
6,130
10,860
11,660
12,470
16,593
17,799
19,498
22,377
24,156
26,421
5,970
6,520
7,070
12,070
13,180
14,280
18,320
19,980
21,640
24,574
26,787
29,000
2,080
2,320
2,340
2,630
2,920
2,340
2,630
2,920
2,340
2,630
2,920
2,570
2,860
3,150
2,570
2,860
3,160
2,570
2,860
3,160
2,900
3,190
3,480
2,900
3,190
3,480
2,900
3,190
3,480
3,110
3,400
3,700
3,110
3,400
3,700
3,110
3,400
3,700
3,110
3,400
3,700
4,050
4,430
4,810
4,050
4,430
4,810
4,050
4,430
4,810
4,050
4,430
4,810
4,170
4,720
5,270
4,170
4,720
5,270
4,170
4,720
5,270
4,170
4,720
5,270
Dimnensions
L
W
H
A
B
C
D
11' 11-3/4 "
11' 11-3/4 "
8' 11-3/4 "
8' 11-3/4 "
8' 11-3/4 "
18' 0-1/2 "
18' 0-1/2 "
18' 0-1/2 "
27' 1-1/4 "
27' 1-1/4 "
27' 1-1/4 "
8' 11-3/4 "
8' 11-3/4 "
8' 11-3/4 "
18' 0-1/2 "
18' 0-1/2 "
18' 0-1/2 "
27' 1-1/4 "
27' 1-1/4 "
27' 1-1/4 "
11' 11-3/4 "
11' 11-3/4 "
11' 11-3/4 "
24' 0-1/2 "
24' 0-1/2 "
24' 0-1/2 "
36' 1-1/4 "
36' 1-1/4 "
36' 1-1/4 "
8' 11-3/4 "
8' 11-3/4 "
8' 11-3/4 "
18' 0-1/2 "
18' 0-1/2 "
18' 0-1/2 "
27' 1-1/4 "
27' 1-1/4 "
27' 1-1/4 "
18' 0-1/2 "
18' 0-1/2 "
18' 0-1/2 "
11' 11-3/4 "
11' 11-3/4 "
11' 11-3/4 "
24' 0-1/2 "
24' 0-1/2 "
24' 0-1/2 "
36' 1-1/4 "
36' 1-1/4 "
36' 1-1/4 "
24' 0-1/2 "
24' 0-1/2 "
24' 0-1/2 "
11' 11-3/4 "
11' 11-3/4 "
11' 11-3/4 "
24' 0-1/2 "
24' 0-1/2 "
24' 0-1/2 "
36' 1-1/4 "
36' 1-1/4 "
36' 1-1/4 "
24' 0-1/2 "
24' 0-1/2 "
24' 0-1/2 "
4' 0 "
4' 0 "
7' 3-1/4 "
7' 3-1/4 "
7' 3-1/4 "
7'-3 1/4 "
7'-3 1/4 "
7'-3 1/4 "
7'-3 1/4 "
7'-3 1/4 "
7'-3 1/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
8' 5-3/4 "
9' 10 "
9' 10 "
9' 10 "
9' 10 "
9' 10 "
9' 10 "
9' 10 "
9' 10 "
9' 10 "
19' 9 "
19' 9 "
19' 9 "
9' 10 "
9' 10 "
9' 10 "
9' 10 "
9' 10 "
9' 10 "
9' 10 "
9' 10 "
9' 10 "
19' 9 "
19' 9 "
19' 9 "
11' 10 "
11' 10 "
11' 10 "
11' 10 "
11' 10 "
11' 10 "
11' 10 "
11' 10 "
11' 10 "
23' 9 "
23' 9 "
23' 9 "
10' 3-7/8 "
11' 3-7/8 "
10' 7-7/8 "
11' 7-7/8 "
12' 7-7/8 "
11' 7-7/8 "
12' 7-7/8 "
13' 7-7/8 "
12' 7-7/8 "
13' 7-7/8 "
14' 7-7/8 "
10' 9-3/8 "
11' 9-3/8 "
12' 9-3/8 "
11' 9-3/8 "
12' 9-3/8 "
13' 9-3/8 "
12' 9-3/8 "
13' 9-3/8 "
14' 9-3/8 "
11' 7-3/8 "
12' 7-3/8 "
13' 7-3/8 "
12' 7-3/8 "
13' 7-3/8 "
14' 7-3/8 "
13' 7-3/8 "
14' 7-3/8 "
15' 7-3/8 "
12' 11-5/8 "
13' 11-5/8 "
14' 11-5/8 "
13' 11-5/8 "
14' 11-5/8 "
15' 11-5/8 "
14' 11-5/8 "
15' 11-5/8 "
16' 11-5/8 "
16' 10-3/8 "
17' 10-3/8 "
18' 10-3/8 "
13' 2-5/8 "
14' 2-5/8 "
15' 2-5/8 "
14' 2-5/8 "
15' 2-5/8 "
16' 2-5/8 "
15' 2-5/8 "
16' 2-5/8 "
17' 2-5/8 "
17' 10-3/8 "
18' 10-3/8 "
19' 10-3/8 "
13' 10-3/8 "
14' 10-3/8 "
15’ 10-3/8 "
14' 10-3/8 "
15' 10-3/8 "
16' 10-3/8 "
15' 10-3/8 "
16' 10-3/8 "
17’ 10-3/8 "
17' 10-3/8 "
18' 10-3/8 "
19' 10-3/8 "
3' 2-3/8 "
3' 2-3/8 "
3' 8-7/8 "
3' 8-7/8 "
3' 8-7/8 "
4' 8-7/8 "
4' 8-7/8 "
4' 8-7/8 "
5' 8-7/8 "
5' 8-7/8 "
5' 8-7/8 "
3' 8-7/8 "
3' 8-7/8 "
3' 8-7/8 "
4' 8-7/8 "
4' 8-7/8 "
4' 8-7/8 "
5' 8-7/8 "
5' 8-7/8 "
5' 8-7/8 "
4' 1-3/8 "
4' 1-3/8 "
4' 1-3/8 "
5' 1-3/8 "
5' 1-3/8 "
5' 1-3/8 "
6' 1-3/8 "
6' 1-3/8 "
6' 1-3/8 "
4' 1-3/8 "
4' 1-3/8 "
4' 1-3/8 "
5' 1-3/8 "
5' 1-3/8 "
5' 1-3/8 "
6' 1-3/8 "
6' 1-3/8 "
6' 1-3/8 "
7' 1-3/8 "
7' 1-3/8 "
7' 1-3/8 "
4' 4-3/8 "
4' 4-3/8 "
4' 4-3/8 "
5' 4-3/8 "
5' 4-3/8 "
5' 4-3/8 "
6' 4-3/8 "
6' 4-3/8 "
6' 4-3/8 "
7' 4-3/8 "
7' 4-3/8 "
7' 4-3/8 "
4' 10-3/8 "
4' 10-3/8 "
4' 10-3/8 "
5' 10-3/8 "
5' 10-3/8 "
5' 10-3/8 "
6' 10-3/8 "
6' 10-3/8 "
6' 10-3/8 "
7' 10-3/8 "
7' 10-3/8 "
7' 10-3/8 "
6' 4-3/8"
7' 4-3/8"
6' 9-1/4"
7' 9-1/4"
8' 9-1/4"
7' 9-1/4"
8' 9-1/4"
9' 9-1/4"
8' 9-1/4"
9' 9-1/4"
10' 9-1/4"
6' 10-3/4"
7' 10-3/4"
8' 10-3/4"
7' 10-3/4"
8' 10-3/4"
9' 10-3/4"
8' 9-1/4"
8' 9-1/4"
10' 10-3/4"
7' 3-1/4"
8' 3-1/4"
9' 3-1/4"
8' 3-1/4"
9' 3-1/4"
10' 3-1/4"
9' 3-1/4"
10' 3-1/4"
11' 3-1/4"
7' 2-1/4"
8' 2-1/4"
9' 2-1/4"
8' 2-1/4"
9' 2-1/4"
10' 2-1/4"
9' 2-1/4"
10' 2-1/4"
11' 2-1/4"
10' 2-1/4"
11' 2-1/4"
12' 2-1/4"
7' 5-1/4"
8' 5-1/4"
9' 5-1/4"
8' 5-1/4"
9' 5-1/4"
10' 5-1/4"
9' 5-1/4"
10' 5-1/4"
11' 5-1/4"
10' 5-1/4"
11' 5-1/4"
12' 5-1/4"
7' 11-1/4"
8' 11-1/4"
9' 11-1/4"
8' 11-1/4"
9' 11-1/4"
10' 11-1/4"
9' 11-1/4"
10' 11-1/4"
11' 11-1/4"
10' 11-1/ "
11' 11-1/4"
12' 11-1/4"
5' 8-1/8"
5' 8-1/8"
4' 2-1/8"
4' 2-1/8"
4' 2-1/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
4' 2-1/8"
4' 2-1/8"
4' 2-1/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
5' 8-1/8"
5' 8-1/8"
5' 8-1/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
4' 2-1/8"
4' 2-1/8"
4' 2-1/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
4' 9-5/8"
5' 8-1/8"
5' 8-1/8"
5' 8-1/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
5' 8-1/8"
5' 8-1/8"
5' 8-1/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
6' 35/8"
6' 3-5/8"
6' 3-5/8"
6' 3-5/8"
6' 11-1/4"
7' 11-1/4"
6' 8-1/4"
7' 8-1/4"
8' 8-14"
6' 8-1/4"
7' 8-1/4"
8' 8-1/4"
6' 8-1/4"
7' 8-1/4"
8' 8-1/4"
6' 9-3/4"
7' 9-3/4"
8' 9-3/4"
6' 9-3/4"
7' 9-3/4"
8' 9-3/4"
6' 9-3/4"
7' 9-3/4"
8' 9-3/4"
6' 11-3/4"
7' 11-3/4"
8' 11-3/4"
6' 11-3/4"
7' 11-3/4"
8' 11-3/4"
6' 11-3/4"
7' 11-3/4"
8' 11-3/4"
8'4"
9'4"
10' 4"
8' 4"
9' 4"
10' 4"
8' 4"
9' 4"
10' 4"
8' 11"
9' 11"
10' 11"
8' 4"
9'4"
10' 4"
8' 4"
9' 4"
10' 4"
8' 4"
9' 4"
10' 4"
8' 11"
9' 11"
10' 11"
8' 4"
9' 4"
10' 4"
8' 4"
9' 4"
10' 4"
8' 4"
9' 4"
10' 4"
9' 0-3/4"
10' 0-3/4"
11' 0-3/4"
Baltimore Aircoil Company
E
F
G
4' 5-7/8"
4' 5-7/8"
4' 5-7/8"
4' 5-7/8"
4' 5-7/8"
4' 5-7/8"
9' 0-3/4"
9' 0-3/4"
9' 0-3/4"
9' 0-3/4"
9' 0-3/4"
9' 0-3/4"
13' 3-5/8"
13' 3-5/8"
13' 3-5/8"
4' 5-7/8"
4' 5-7/8"
4' 5-7/8"
4' 5-7/8"
4' 5-7/8"
4' 5-7/8"
9' 0-3/4"
9' 0-3/4"
9' 0-3/4"
9' 0-3/4"
9' 0-3/4"
9' 0-3/4"
11' 6-5/8"
11' 6-5/8"
11' 6-5/8"
5' 11-7/8"
5' 11-7/8"
5' 11-7/8"
5' 11-7/8"
5' 11-7/8"
5' 11-7/8"
12' 0-3/4"
12' 0-3/4"
12' 0-3/4"
12' 0-3/4"
12' 0-3/4"
12' 0-3/4"
16' 0-5/8"
16' 0-5/8"
16' 0-5/8"
4' 5-7/8"
4' 5-7/8"
4' 5-7/8"
4' 5-7/8"
4' 5-7/8"
4' 5-7/8"
9' 0-3/4"
9' 0-3/4"
9' 0-3/4"
9' 0-3/4"
9' 0-3/4"
9' 0-3/4"
11' 6-5/8"
11' 6-5/8"
11' 6-5/8"
5' 11-7/8"
5' 11-7/8"
5' 11-7/8"
5' 11-7/8"
5' 11-7/8"
5' 11-7/8"
12' 0-3/4"
12' 0-3/4"
12' 0-3/4"
12' 0-3/4"
12' 0-3/4"
12' 0-3/4"
16' 0-5/8"
16' 0-5/8"
16' 0-5/8"
5' 11-7/8"
5' 11-7/8"
5' 11-7/8"
5' 11-7/8"
5' 11-7/8"
5' 11-7/8"
12' 0-3/4"
12' 0-3/4"
12' 0-3/4"
12' 0-3/4"
12' 0-3/4"
12' 0-3/4"
16' 0-5/8"
16' 0-5/8"
16' 0-5/8"
Engineering Data
M
6" WATER IN
M
M
2" CLEAN OUT
D
H
1'-0 1/2"
9"
6" WATER OUT
2'-0"
C
3"
7"
A
3" OVERFLOW
2" DRAIN
1" MAKE UP
1'-7 3/4"
B
L
FACE C
W
FACE A
Cooling Towers
3"
Do not use for construction. Refer to factory certified dimensions. This supplement includes data
current at the time of publication, which should be reconfirmed at the time of purchase. Up-to-date
engineering data, free product selection software, and more can be found at www.BaltimoreAircoil.com.
7"
Models PT2-0412A
M
D
H
8" WATER IN
3" OVERFLOW
B
1" MAKE UP
1'-0 1/2"
1'-7 3/4"
2" DRAIN
3"
8"
A
C
8" WATER OUT
2'-0"
L
1'-7 1/4"
W
9"
FACE C
FACE A
8 3/4"
Models PT2-0709A, PT2-0809A, PT2-0812A
M
M
D
H
8" WATER IN
1" MAKE UP
1'-7 3/4"
2" DRAIN
3"
8"
A
1'-0 1/2"
3" OVERFLOW
B
2'-0"
8" WATER OUT
9"
W
FACE A
C
L
FACE C
Models PT2-1009A, PT2-1012A, PT2-1212A
...because temperature matters™
D76
7"
Engineering Data (continued)
D
H
3" OVERFLOW (2)
1 1/2" MAKE UP
1'-7 3/4"
1'-0 1/2"
B
A
3"
8"
PT2
8" WATER IN (2)
M
Cell 1
2'-0"
8" WATER OUT (2)
Cell 2
9"
9"
2" DRAIN (2)
1'-7 1/4"
W
F
C
FACE A
CONNECTIONS TYPICAL EACH END
E
L
FACE C
8 3/4"
Typical 2-Cell Configuration for models PT2-0709A, PT2-0809A, PT2-0812A
M
M
M
8" WATER IN (2)
D
H
1 1/2" MAKE UP
Cell 1
2'-0"
8" WATER OUT (2)
Cell 2
9"
9"
2" DRAIN (2)
FACE A
F
L
(CONNECTIONS TYPICAL EACH END)
FACE C
W
3"
1'-0 1/2"
8"
1'-7 3/4"
B
A
3" OVERFLOW (2)
C
E
Typical 2-Cell Configuration for models PT2-1009A, PT2-1012A, PT2-1212A
D77
Baltimore Aircoil Company
7"
8" WATER IN (3)
M
D
H
1" MAKE UP
3" OVERFLOW (3)
1" MAKE UP
Cell 2
Cell 1
2'-0"
8" WATER OUT (2)
9"
12'-0 3/4"
2" DRAIN (3)
1'-7 1/4"
W
Cell 3
F
9"
E
F
G
C
FACE A
8"
8"
A
6'-3 5/8"
L
FACE C
8 3/4"
Typical 3-Cell Configuration for models PT2-1009A, PT2-1012A, PT2-1212A
M
M
M
M
8" WATER IN (3)
Cooling Towers
1'-7 3/4"
1'-0 1/2"
3"
B
D
H
1 1/2" MAKE UP
8"
8"
B
A
Cell 2
8" WATER OUT
2" DRAIN (3)
Cell 1
8" WATER OUT (2)
2'-0"
3" OVERFLOW (3)
1'-7 3/4"
1'-0 1/2"
3"
1 1/2" MAKE UP
9"
W
Cell 3
12'-0 3/4"
F
F
C
FACE A
(CONNECTIONS TYPICAL EACH END)
G
9"
E
6'-3 5/8" TYP.
L
FACE C
8 3/4"
Typical 3-Cell Configuration for models PT2-1009A, PT2-1012A, PT2-1212A
M
M
M
M
8" WATER IN (2)
D
H
2'-0"
Cell 2
Cell 3
Cell 1
8" WATER OUT (4)
2'-0"
W
FACE A/B
(CONNECTIONS TYPICAL EACH END)
B
3"
8"
A
1'-0 1/2"
1'-7 3/4"
1'-0 1/2"
1 1/2" MAKE UP
Cell 1
9"
2" DRAIN (2)
C
9"
3" OVERFLOW (2)
L
FACE C
Typical Quad Configuration for models PT2-1009A, PT2-1012A, PT2-1212A
...because temperature matters™
D78
PT2
Structural Support
The recommended support arrangement for the PT2 Cooling Tower consists of parallel I-beams
positioned as shown on the drawing. Besides providing adequate support, the steel also serves to raise
the unit above any solid foundation to assure access to the bottom of the tower. The PT2 Cooling Tower
may also be supported on columns at the anchor bolt
locations shown in Plan A.
A minimum bearing surface of 12 in2 (77,742mm2) must be
provided under each of the concentrated load points (See
Note 6). To support a PT2 Cooling Tower on columns with
an alternate steel support arrangement, or the optional
structurally upgraded unit, consult your local BAC
Representative.
Plan A: Single-Cell Standard1 Units Only
Model Number
L
W
A
B
C
D
PT2-0412A
11’ 11-3/4”
4’ 0”
3’ 9-3/4”
1-1/8”
10’ 5-1/4”
9-1/4”
PT2-0709A
8’ 11-3/4”
7’ 3-1/4”
7’ 1”
1-1/8”
7’ 5-1/4”
9-1/4”
PT2-0809A
8’ 11-3/4”
8’ 5-3/4”
8’ 3-1/2”
1-1/8”
7’ 5-1/4”
9-1/4”
PT2-0812A
11’ 11-3/4”
8’ 5-3/4”
8’ 3-1/2”
1-1/8”
10’ 5-1/4”
9-1/4”
PT2-1009A
8’ 11-3/4”
9’ 10”
9’ 7-3/4”
1-1/8”
7’ 5-1/4”
9-1/4”
PT2-1012A
11’ 11-3/4”
9’ 10”
9’ 7-3/4”
1-1/8”
10’ 5-1/4”
9-1/4”
PT2-1212A
11’ 11-3/4”
11’ 10”
11’ 7-3/4”
1-1/8”
10’ 5-1/4”
9-1/4”
Plan B: Single-Cell Standard2 Units Only
Model Number
L
W
A
B
C
D
PT2-0412A
11’ 11-3/4”
4’ 0”
3’ 4”
4”
11’ 9-1/2”
1-1/8”
PT2-0709A
8’ 11-3/4”
7’ 3-1/4”
6’ 7-1/4”
4”
8’ 9-1/2”
1-1/8”
PT2-0809A
8’ 11-3/4”
8’ 5-3/4”
7’ 9-3/4”
4”
8’ 9-1/2”
1-1/8”
PT2-0812A
11’ 11-3/4”
8’ 5-3/4”
7’ 9-3/4”
4”
11’ 9-1/2”
1-1/8”
PT2-1009A
8’ 11-3/4”
9’ 10”
9’ 2”
4”
8’ 9-1/2”
1-1/8”
PT2-1012A
11’ 11-3/4”
9’ 10”
9’ 2”
4”
11’ 9-1/2”
1-1/8”
PT2-1212A
11’ 11-3/4”
11’ 10”
11’ 2”
4”
11’ 9-1/2”
1-1/8”
Notes:
1. Contact your local BAC Representative for multi-cell or
structurally upgraded unit steel support.
2. Contact your local BAC Representative for structurally
upgraded unit steel arrangements.
3. Support beams and anchor bolts to be selected and
installed by others.
4. All support steel must be level at the top.
5. Beams must be selected in accordance with accepted
structural practice. Maximum deflection of beam under
unit to be 1/360 of span, not to exceed 1/2”.
D79
Baltimore Aircoil Company
6. If point vibration isolation is used with multi-cell towers,
the isolators must be located under the support steel,
not between the support steel and the cooling towers.
Structural Support Alternatives
Model Number
Unit Replaced
A
B
C
L
W
VT0-102 thru 116
3’ 9-3/8”
11’ 5-1/2”
1-5/16”
4’ 0”
11’ 11-3/4”
Cooling Towers
For replacement installations, the PT2 Cooling Tower has been designed to match the supporting steel of
many existing counterflow and crossflow cooling towers without modifications. Shown below are the most
common steel support arrangements which can be accommodated by the PT2. IBC wind and seismic load
ratings are not available on alternate steel support arrangements. If individual point support is required, or
if the steel arrangement is not shown as below, consult your local BAC Representative for assistance.
PT2-0412A
VTL-103 thru 137
3’ 11”
13’ 11-1/2”
1/2”
4’ 0”
11’ 11-3/4”
PT2-0709A
FXT-115 thru 142
7’ 1-7/8”
8’ 0”
11/16”
7’ 3-1/4”
8’ 11-3/4”
PT2-0809A
VT1-N209 thru N270
7’ 7-5/8”
10’ 5-1/4”
5-1/16”
8’ 5-3/4”
8’ 11-3/4”
VT1-N209 thru N270
7’ 7-5/8”
10’ 5-1/4”
5-1/16”
8’ 5-3/4”
11’ 11-3/4”
Series 15146 thru 15282
6’ 9-3/4”
11’ 7-3/4”
10”
8’ 5-3/4”
11’ 11-3/4”
VTL/VST
8’ 3-1/2”
8’ 9-1/8”
1-1/8”
8’ 5-3/4”
11’ 11-3/4”
CFT
8’ 0”
8’ 3-1/2”
2-7/8”
8’ 5-3/4”
11’ 11-3/4”
VXT-N215 thru N265
7’ 11-1/2”
11’ 7-3/4”
3-1/8”
8’ 5-3/4”
11’ 11-3/4”
PT2-0812A
PT2-1012A
PT2-1212A
Series 3000
8’ 3-1/4”
8’ 3-1/2”
1-1/8”
8’ 5-3/4”
11’ 11-3/4”
VXT-315 thru 400
9’ 10-1/8”
11’ 7-3/4”
(0-1/16”)
9’ 10”
11’ 11-3/4”
Series 1500
11’ 7-3/4”
10’ 5-1/4”
1-1/8”
11’ 10”
11’ 11-3/4”
Series 3000
9’ 6”
11’ 11”
1’ 2”
11’ 10”
11’ 11-3/4”
VXT, VLT, VST
8’ 11-1/4”
11’ 11”
1’ 5-3/8”
11’ 10”
11’ 11-3/4”
VXT, VXMT
9’ 7-1/2”
11’ 11”
1’ 1-1/4”
11’ 10”
11’ 11-3/4”
CFT
8’ 0”
11’ 11”
1’ 11”
11’ 10”
11’ 11-3/4”
See Notes on previous page.
...because temperature matters™
D80
Engineering Specifications
See our website at www.BaltimoreAircoil.com for an electronic copy of product engineering specifications.
PT2
1.0 Cooling Tower
1.1 General: Furnish and install ____factory assembled,
induced draft counterflow, axial fan, open cooling tower(s)
with vertical air discharge, conforming in all aspects to the
specifications and schedules as shown on the plans. Overall
dimensions shall not exceed approximately ____ft (m) long x
____ft (m) wide x ____ft (m) high. The total connected fan
horsepower shall not exceed ____HP (kW), ______ RPM
and be suitable for _____ volt, ____ hertz, and ___ phase
electrical service. Furnish motors. The cooling tower(s) shall
be Baltimore Aircoil Company Model(s) ________________.
1.2 Thermal Capacity: The open cooling tower(s) shall be
warranted by the manufacturer to cool ______USGPM (l/s) of
water from ____°F (°C) to ____°F (°C) at ____°F (°C) entering
wet-bulb temperature. The thermal performance shall be
certified by the Cooling Technology Institute in accordance
with CTI Certification Standard STD-201. Manufacturers’
performance guarantees or performance bonds without CTI
Certification or independent field thermal performance test
shall not be accepted. The cooling tower(s) shall comply with
the energy efficiency requirements of ASHRAE Standard 90.1.
1.3 Quality Assurance: The cooling tower manufacturer shall
have a Management System certified by an accredited
registrar as complying with the requirements of ISO9001:2000
to ensure consistent quality of products and services.
Manufacturers that are not ISO9001 certified shall not be
acceptable.
2.0 Construction Details
EVERTOUGH™ Construction
2.1 Structure: Thermosetting hybrid polymer: All steel panels
and structural members shall be protected with the
thermosetting hybrid polymer for superior corrosion protection.
G-235 (Z700 metric) hot-dip galvanized steel shall be
prepared in a four-step (clean, pre-treat, rinse, dry) process
with an electrostatically sprayed, thermosetting hybrid polymer
fuse-bonded to the substrate during a thermally activated
curing stage and monitored by a 23-step quality assurance
program. Finish shall withstand 6000 hours of 5% salt spray
test per ASTM B117 without blistering, chipping or loss of
adhesion. Type 304 stainless steel shall be considered an
acceptable alternative. Uncoated G-235 galvanized steel shall
not be considered an acceptable alternative.
2.2 Cold Water Basin constructed of the TriArmor® Corrosion
Protection System: The cold water basin shall be protected
with the TriArmor® Corrosion Protection System. The system
shall consist of G-235 galvanized steel encapsulated with a
thermosetting hybrid polymer further protected by a
polyurethane liner factory applied to all submerged surfaces.
The polyurethane barrier shall seal all factory seams in the
cold water basin to ensure a corrosion resistant and water
tight construction, and shall be warranted against leaks and
corrosion for five (5) years. Field applied polyurethane or
polyurethane applied directly to galvanized steel is not an
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Baltimore Aircoil Company
acceptable alternative. Standard basin accessories shall
include: a corrosion resistant make-up valve with large
diameter polystyrene filled plastic float for easy adjustment of
the operating water level, removable anti-vortexing device to
prevent air entrainment, and large area lift out strainers with
perforated openings sized smaller than the water distribution
system nozzles. A welded type 304 or 316 stainless steel
basin shall be an acceptable alternative; provided the basin is
warranted against leaks and corrosion for a period of at least
5 years. A bolted basin shall not be an acceptable alternative.
Type 301 stainless steel is not acceptable. The entire cooling
tower, including fan motor, drive system, bearings, and
structure, shall be backed by a comprehensive Louver-toLouverSM Five-Year warranty.
2.3 Air Inlet Louver: All louvers shall be constructed from
PVC. Louver sections shall be individually removable in 12”
wide (maximum) sections, allowing for quick and easy access
to any part of the cold water basin, without the need for tools.
Louvers shall prevent debris from entering the cold water
basin as well as preventing splashout. Louvers which are
greater than 12” wide or require tools for removal shall not be
an acceptable alternate.
2.4 Wind and Seismic Rating: The cooling tower shall be
constructed of heavy-gauge steel utilizing double-brake
flanges for maximum strength and rigidity and reliable sealing
of watertight joints. The structure shall be designed, tested
and certified in accordance with IBC 2006 regulations to meet
a seismic load SDS= ___ g and a wind load of ___ psf. Units
not provided with a certificate of IBC 2006 compliance shall
not be an acceptable alternative.
2.5 Rigging: The cooling tower shall be designed and
constructed to withstand rigging of the casing and cold water
basin as a single piece.
2.6 Casing Field Joint: The heat transfer section shall be
joined to the lower section without the use of a gasket or
sealer. The field joint shall be self aligning and require a
minimum number of fasteners.
2.7 Heat Transfer Section: The heat transfer section(s) shall
consist of fill, a non-corrosive spray water distribution
system and drift eliminators arranged for optimal thermal
performance with minimal drift.
2.8 Fill: The fill shall be formed from self-extinguishing
polyvinyl chloride (PVC) having a flame spread rating of 5 per
ASTM E84 and shall be impervious to rot, decay, and fungus
or biological attack. The fill shall be suitable for use as a
working platform, and shall be provided and performance
tested by the cooling tower manufacturer to assure single
source responsibility and control of the final product. The fill
shall be able to withstand a water temperature of 140°F
(60.0º C).
2.10 Drift Eliminators: Eliminators shall be constructed of
specially formulated PVC and be removable in easily handled
sections. They shall have a minimum of three changes in air
direction.
3.0 Mechanical Equipment
3.1 Fan(s): Fan(s) shall be axial flow with aluminum alloy
blades selected to provide optimum cooling tower thermal
performance with minimal sound levels. Air shall discharge
through a fan cylinder designed for streamlined air entry and
minimum tip clearance for maximum fan efficiency. The top of
the fan cylinder shall be equipped with a conical, non-sagging
removable fan guard. The fan(s) and fan drive system,
including the fan motor, shall be factory test-mounted and
aligned to ensure reliable operation and ease of maintenance.
5.0 Sound
5.1 Sound Level: To maintain the quality of the local
environment, the maximum sound pressure levels (dB)
measured 50 ft from the cooling tower operating at full fan
speed shall not exceed the sound levels detailed below.
6.0 Accessories
Location
63
125
250
500
1000 2000 4000 8000 dB(A)
Discharge
Air Inlet
Motor Side
6.1 Basin Heater(s): The cooling tower cold water basin shall
be provided with electric heater(s) to prevent freezing in low
ambient conditions. The heater(s) shall be selected to
maintain 40°F (4.4˚C) basin water temperatures at _____°F
ambient. The heater(s) shall be ______V/____phase/___Hz
electric and shall be provided with low water cutout and
thermostat.
6.2 Vibration Cutout Switch: Provide mechanical local reset
vibration switch. To ensure this, the trip point will be a
frequency range of 0 to 3,600 RPM and a trip point of 0.2 to
2.0g.
Cooling Towers
2.9 Water Distribution System: Water shall be distributed
evenly over the fill by a water distribution system consisting of
a header and spray branches of non-corrosive Schedule 40
PVC pipe with large orifice, non-clog plastic distribution
nozzles. The headers shall have a removable cap facilitating
quick header cleanout without removal. The spray nozzles
shall be held in place by snap-in rubber grommets and the
branches should be removable without tools or removal of
branch supports, allowing quick removal of individual nozzles
or complete branches for cleaning or flushing. Branches that
require tools for removal or removal of branch supports shall
not be an acceptable alternative.
3.2 Bearings: Fan(s) and shaft(s) shall be supported by
heavy-duty, self-aligning, grease packed ball bearings with
moisture proof seals and integral slinger collars, designed for
L10 80,000 hour life. Extended bearing lube lines shall be
terminated at the access door for ease of maintenance, and
shall require opening the access door for visual inspection and
to verify proper lubrication.
3.3 Fan Drive: The fan(s) shall be driven by a one-piece,
multi-groove, solid back V-type powerband with taper lock
sheaves designed for 150% of the motor nameplate
horsepower. The powerband shall be constructed of neoprene
reinforced polyester cord and be specifically designed for
cooling tower service.
3.4 Sheaves: Fan and motor sheave(s) shall be fabricated
from corrosion-resistant materials to minimize maintenance
and ensure maximum drive and powerband operating life.
3.5 VFD Type Fan Motor: Premium efficient or inverter duty
motors shall be either totally enclosed air over (TEAO) or
totally enclosed fan cooled (TEFC), reversible, squirrel cage,
ball bearing type designed specifically for cooling tower
service. The motor(s) shall be furnished with special moisture
protection on winding, shafts, and bearings and appropriately
labeled for “cooling tower duty.” Fan motor(s) shall be inverter
duty type designed per NEMA Standard MG1, Section IV Part
31, Section IV, and Part 31.
3.6 Mechanical Equipment Warranty: The fan(s), fan shaft(s),
bearings, mechanical equipment support and fan motor shall
be warranted against defects in materials and workmanship
for a period of five (5) years from date of shipment.
4.0 Access
4.1 Tower Access: Permanently mounted, inward sliding
access doors are provided for safe and easy access to the
spray branch and fan drive system for routine maintenance.
Removable access doors are not acceptable.
...because temperature matters™
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