|
Cooling Towers Options |
|
|
Steel Mounting Platform |
|
This option is beneficial
in installations where a flat and level surface is not
available for mounting Delta's cooling towers. This
steel platform is also utilized for replacement installations
where only "I" beams, or other forms of support exist.
The platform may be shipped in two separate pieces,
for transportation purposes, and must be supported in
the field by others. This steel platform is finished
in a black semi-gloss alkyd paint.
|
|
Skid Mounting Assembly |
|
The skid mounting assembly is a desirable option which
minimizes the field labor required to install a Pioneer®
cooling tower. Included with this option is a steel mounting
platform finished in a black semi-gloss alkyd paint, with
the cooling tower and blower assembled and mounted to
the platform. Guy Wires are included and assembled to
stabilize the tower onto the platform. Additional options
can readily be mounted onto the platform to complete the
factory assembly. These options include blower hood, influent
and/or effluent pumps, pre-piping of the pumps, mounting
of a control panel, and pre-wiring of the control panel.
|
|
Ladder |
| The
ladder assembly facilitates access to the upper section
of the cooling tower for inspection and maintenance of
the water distribution system and fan assembly as required.
The assembly is fabricated of aluminum for lightweight
installation and has skid resistant rungs and landing
platform. The landing platform is specifically placed
to maximize accessibility to the manway located in the
conical section of the tower for easy access and servicing
of components. |
|
Safety Cage |
|
Complementary to the ladder option and is to the ladder
at the factory for ease of unit extends above the landing
platform. This assembly is attached directly installation.
The cage assembly is manufactured of the same type of
aluminum as the ladder. |
|
Upper Platform Safety Handrails |
|
An optional upper platform/fan deck with safety handrail
system is available on the Premier™ and TM SeriesPREMIER™
models to provide protection while on top of the cooling
tower inspecting or working on the mechanical equipment.
This option is shipped pre-fabricated for assembly in
the field. |
|
Blower Guard |
|
The Pioneer® blower guard offers protection from accidentally
contacting the rotating components of the fan such as
the wheel, shafts and the v-belts. |
|
The blower guard is also utilized as a screen for outdoor
installations to prevent leaves and other debris from
entering the tower through the double sided blower inlets.
|
|
The guard is fabricated of PVC coated 3/8" #2 wire mesh
screen attached to the blower frame with stainless steel
fasteners. |
|
Blower Hood |
| The
Pioneer® blower hood completely encloses the blower
to offer maximum protection to personnel who might accidentally
contact the rotating components. |
|
The blower hood provides protection against rain and windblown
debris entering the standard double inlet blower assemblies.
It also protects the motors and drives from water spray
which may affect their operation. |
|
Furthermore, the hood offers an aesthetic quality to the
blower assembly because it is molded from the same high
density polyethylene material as the tower shell and its
appearance is, therefore, consistent with the tower shell.
|
|
The hood also serves as an additional sound dampening
device for the already quiet standard Delta blower assemblies.
With these hoods properly installed, a 3 dBA reduction
at 5 feet is common. |
|
The hood inlets are covered with a PVC coated 3/8" #2
wire mesh screen fastened to the hood with stainless steel
hardware. |
|
Mastic Coating of Blower Assembly |
| Mastic
coating of the Pioneer® blower wheel, housing and
frame is desirable when additional corrosion protection
is required. The mastic coating is applied directly over
the standard enamel finish. This option is recommended
in areas of continuous high humidity. It also provides
protection from corrosive compounds, acids, etc. The material
used is a brush on, solvent based, asphaltic film coating
which is impervious to standing water and airborne spray.
Mastic coating has proven successful in prolonging the
average life of a standard blower assembly. After final
assembly, the blower shaft and sheaves are coated with
a special shaft coating material. This coating conforms
to MIL-C-16173D, GR 1 & 4. For best results, periodic
recoating of both the wheel and housing is recommended.
|
|
Premium Blower Corrosion Protection |
| Premium
Pioneer® blower corrosion protection is desirable
when the unit will be operated in highly corrosive atmospheres
such as paper mills, coastal areas, chemical plants, etc.
The premium blower corrosion protection option consists
of complete PVC encapsulation of the blower wheel and
housing and frame. A T-304 stainless steel shaft is also
included. This option offers a cost effective alternative
to FRP blower assemblies. The blowers and frames are prepared
at the factory with all holes and cutouts completed. The
entire assembly is sandblasted, then dipped in a molten
PVC solution which coats the entire surface. When dry,
the PVC attains an average thickness of 30 mils and forms
a complete covering of the standard frame and housing.
The blower wheel is coated in the same manner, except
for the shaft bore, and is then re-balanced both statically
and dynamically. |
|
After final assembly, the shaft and sheaves are coated
with a specially formulated shaft coating material which
conforms to MIL-C-16173D, GR 1 & 4. The result is a blower
assembly which will give years of corrosion free service
even under the most adverse conditions. |
|
Two Speed Motor Option |
| Two
speed motors provide cold water temperature control by
means of airflow modulation, allowing for design cold
water temperature at minimum operating cost. When provided
with a two stage thermostat, the motor can be reduced
to half speed when cold water sump temperature approaches
design. The motor will shut off when the cold water temperature
falls below design. |
|
Two-speed motors are provided for single voltage 3 phase
operation only. Single phase dual voltage motors are not
available. |
|
NOTE: A 1/2 reduction in motor speed corresponds
to a 1/2 reduction in airflow. At half speed operation,
only 1/8 BHP is consumed. |
|
Blower Thermostats - Single and Two Stage
|
| The
fan thermostat is used to minimize operating costs by
sensing water temperature and controlling blower operation
during cold or cool weather service. When cold water temperature
drops below design, the blower will shut off saving motor
hp operating costs and serves as an antifreeze device.
|
| A
single stage thermostat controls the blower on and off
and is provided with standard single speed motors. A two
stage thermostat is required for two speed motor operation
and controls the blower from "on" to "half speed" and
then to "off". At half speed operation the motor operates
at only 1/4 full load BHP. Two stage thermostats must
be wired to Delta specifications. |
| The
thermostat has a 5° F differential in its operating range
of 30°F to 130°F. The contacts are SPDT and have a 15
Amp UL rating. They are complete with NEMA 4 enclosures
suitable for outdoor mounting. |
|
The thermostat can be provided loose, or installed in
the cooling tower sump, or an indoor storage tank.
|
|
Vibration Cut Out Switch |
| The
vibration cut-out switch option helps prevent further
potential damage by shutting the motor off. It is wired
in series with the motor starter coil and has dry contact
rating of 10 ampere capacity at 120 VAC. |
|
Resistance Heating Option |
| The
antifreeze package is supplied to provide protection against
freezing of standing water in the cooling tower sump due
to shutdown during winter operation. |
|
This option is provided when draining the system during
periods of prolonged shutdown is not feasible, such as
during weekends, or when a separate gravity feed indoor
storage tank is not part of the re-circulation system.
|
Protection
is provided by resistance heating of the sump water, and
this package includes the following components:
Immersion Heater - Capacity sized for service. NEMA
4 enclosure.
Thermostat Assembly - NEMA 4 enclosure with SPDT
switch. 30-130°F temperature range. 120/277 Volt with
3/4"
Sch 80 bulkhead fitting and a 3/4" x 1/2" Sch 40 reducer.
Thermostat is to be set in the field. Recommended setting
is approximately 38°F.
Liquid Level Switch Assembly - NEMA 7 and 9 enclosure
is standard on this SPDT level switch. This insures
that the heating element is submerged prior to energizing
to prevent immersion heater burn-out in case of low
water level.
Heater Contactor -NEMA l enclosure is standard. Open
style for control panel mounting is available. This
contactor is mounted in the control panel when the panel
is purchased from Delta. |
| Protection
of external piping by heat tracing and insulation is recommended
but not included. |
|
Antifreeze Package - Electrically Activated Drain
Valve |
| This
option is utilized when freezing of standing water in
the cooling tower sump could occur due to system shutdown
during winter operation. |
|
An electrically actuated valve will open when the pumps
are not operating and temperatures approach freezing.
The valve can be installed in the sump drain fitting of
the tower at the factory or remotely at the piping low
point by others in the field. |
Components provided are:
Electrically actuated to close, spring to open, 2-way
valve, 1" line size, with NEMA 4 enclosure.
When power is removed the valve automatically reverts
to the open position. This feature ensures freeze protection
even during a power outage.
1" PVC tee
1" PVC plug
Temperature switch with bulkhead fitting
|
|
Motor Space Heater |
|
Fan Motor Space Heaters are recommended for installations
where temperature variations can cause excessive condensation
within the motor. The Space Heater controls can be incorporated
in our Control Panel and would be designed for automatic
and manual operation. While the motor is operating, the
heater remains off. When the motor shuts down, the heater
is automatically energized during the off cycle. The Control
Panel would be designed with manual on/off control for
intermittent cycles of operation. Heaters are available
for 115, 230, 460, or 550 volts, 3 phase, 60 cycle operation.
|
|
Outlet Strainer Basket |
|
This option is desirable to prevent debris which may have
entered the cooling tower sump from getting into the pump,
or the rest of the cooling water system. This option is
recommended to minimize particle size which could foul
chillers, heat exchanger, compressors, or the cooling
tower nozzles. |
|
A vortex breaker pipe, which is provided as standard on
pump suction applications, is included to maximize the
inlet area and prevent cavitation. The strainer is made
from a vortex breaker pipe surrounded by 3/16" #2 PVC
coated mesh screen. Finer mesh screens can be overlaid
to minimize particle size. |
|
High Sump Level Switch |
|
The high sump level switch option is utilized when a potential
overflow condition must be avoided. Level switch elevation
is set below the point when the water in the sump will
overflow onto the ground. The switch can be used to illuminate
a light, shut off the influent feed pump or initiate some
other device or alarm. |
|
Flange Adapters |
|
This option provides 125 lb. Schedule 80 PVC flanged connection
at approximately 6" projection minimum from the cooling
tower. Gaskets and hardware are not provided by Delta
and should be provided by others with the piping companion
flange. |
|
Equalizer Fittings |
|
This option is desirable for multiple module installations
to provide equal liquid levels in the sumps of the individual
modules and allows for the installation of only one water
make-up line. |
|
Delta provides the bulkhead fittings installed in the
cooling towers to provide for gravity flow from one tower
sump to another. The equalizer connection is not for full
flow transfer, i.e. pumping from one unit to another.
|
|
The connecting piping should be field installed and is
the responsibility of others. |
|
Bottom Outlet |
|
A bottom outlet provides for complete drainage of water
from the cooling tower sump. This option is attractive
when indoor tanks are utilized for complete drainage of
the cooling tower. This prevents standing water from possibly
freezing and damaging PVC piping. |
|
Pump(s) |
The pump package is offered to allow for single source
responsibility of cooling tower equipment. The size of
the pump is determined by two factors:
1. Flow rate (gpm)
2. Total dynamic head. (feet) |
|
The customer is responsible for supplying this information.
The pumps come complete close coupled with mechanical
seals and ODP, 208-230V/460V, 3 phase motor. TEFC motors
are available. |
|
Pump Mounting |
This option is available when the skid mounting option
is also selected. A pump is mounted into the platform
and the suction is pre-piped with PVC Sch. 80 pipe and
fittings. This reduces the amount of field labor involved
in installing a cooling tower system.
|
|
Control Panels |
A control panel is required any time there are electrical
devices involved in a system. The standard features of
a Delta supplied control panel are:
NEMA 12 enclosure.
Starters with integrally mounted thermal overloads
with manual or automatic reset.
Terminal block connections for all incoming leads.
Control circuit transformer with primary and secondary
fuses.
NEMA 12, two or three position selector switches
and lights for all starters provided.
Color coded and numbered control circuit wires.
Wiring diagram permanently affixed inside enclosure.
|
Optional items available are:
Disconnect switch, either fused, unfused or magnetic
circuit breaker type.
Motor starter fuses or circuit breakers.
Additional motor starters, selector switches and
lights to interface with existing systems. remote pumps.
etc.
Any other NEMA enclosure manufactured.
Pre-mounting of control panel and pre-wiring of skid
mounted options with Liquid-Tite conduit or EMT.
Delta also can provide programmable controllers,
computer interfacing, telemetry, and any other type
of control system required. Pre-mounting and pre-wiring
of the control panel for a system installation are available.
This minimizes the labor required for field installation.
|
|
Storage Tanks |
| |
|
|
|
The tank is utilized when
extra water capacity is required. Potential applications
are for system modulation when pumping flow rates vary,
or for additional water storage. A hot/cold tank arrangement
may be required in those cases where the process hot water
exceeds the maximum allowable inlet water temperature
(140°F). This is a dual loop system where the cooling
tower would typically flow more water than the process.
The difference in flow would be made up and mixed with
the hot water to reduce its temperature. The tank and
optional cover are fabricated of high density polyethylene.
All fittings are Type 1 PVC. Standard capacities are 300
to 2000 gallons, others are available. |
|
|
|
|
Delta Cooling Towers, Inc |
|
|
41 Pine Street, Rockaway, NJ 07866 |
|
|
1.800.BUY.DELTA (289.3358), Fax 1.973.586.2243
|
|
|
sales@deltacooling.com
|
|
|
|
|
|
© 2009 Delta Cooling Towers, Inc. |
|
