Download Panwater PET 300 & 400 FC Series Cooling Towers.pdf PDF

TitlePanwater PET 300 & 400 FC Series Cooling Towers.pdf
File Size3.2 MB
Total Pages4
Document Text Contents
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email: [email protected] Website: www.panwater.com

Product Information…

PANWATER PET 300 & 400 FC Series Cooling Towers

Types:

The PET 300 & 400 FC Series cooling towers are field erected induced draft cross flow type previously constructed of timber
are now constructed with engineering materials replacing all timber components such as the mainframe structure and the
splash bars system. They share all the advantages of timber cooling tower with the addition of longer tower life span, lighter
operating weight and less maintenance required with the use of FRP Pultrusion for tower structure and extruded plastic splash
bar and drift eliminator system.

Applications:

PET 300 & 400 FC Series cooling towers are designed and
constructed for heavy duty continuous industrial processes
where circulation cooling water is contaminated and/or
untreated. Raw water or untreated water is used for make-up
water supply. Bacteria growth or scaling is anticipated in the
fill packing section. Circulation water with very high inlet water
temperature or anticipate unusually high temperature during
operation. The cooling tower is suitable to operate in
environment with unavoidable air pollution where airborne
particle such as dust and fibrous materials is constantly
present in the surroundings. Typical applications include direct
cooling water for quenching, barometric water in vacuum
system, waste water treatment plant, biomass power plant,
heat exchangers and condensers, equipment water jackets
and cooling coil for process equipment.

Features:

�9 Robust construction using FRP pultrusions provides long life span and trouble free operation.
�9 Extruded polypropylene splash bars construction withstands high temperature circulating water.
�9 Extruded polypropylene profile splash bar is less susceptible to clogging & increase efficiency.
�9 Smooth extruded splash bars fill packing section allows easier cleaning during tower operation.
�9 Extruded polypropylene splash bars can withstand hjigh operating temperature of up to 85”C.
�9 Extruded polyvinyl chloride drift eliminator system reduce algae growth and easier cleaning.
�9 Gravity type hot water distribution systems provide direct access for maintenance and low pump head.
�9 Heavy duty type fan machineries provide trouble free operation and minimum maintenance.

Tower Mainframe Structure

The entire cooling tower mainframe structure is constructed of FRP
Pultrusion profiles of various shapes and sizes for different
structural members due to its higher flexural strength than timber
and has significantly higher strength-to-weight ratio. Moreover,
FRP Pultrusion materials has remarkably low water absorption
properties which is almost negligible, when used for cooling tower
construction, final overall operating weight is very much reduced
compare to the cooling tower constructed of timber with the same
model.

With this extremely superior quality, the final supporting system
such as the foundation or the supporting structure required for the
operating weight of the cooling tower is very much reduced while
providing a very robust and strong framework to support all the
cooling tower components.

As FRP is an engineered material, it is also possible the FRP
pultrusion used for cooling tower construction is manufactured with the
proper selection of resin system for corrosion resistant properties to
cater for any specific water condition it may anticipate. Thus, cooling
tower constructed of FRP pultrusion is suitable for the most demanding
industrial application handling corrosive water such as the waste water
treatment plant of many industrial processes and cooling water of
barometric system in oil refineries where cooling water is very corrosive
and contaminated.

As a standard, all FRP materials used for the construction of cooling
tower shall be manufactured with fire retardant capability conforming to
ASTM E-84 with flame spread rate of 25 or less with self extinguishing
properties.

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email: [email protected] Website: www.panwater.com

Product Information…

Hot Water Distribution

The hot water distribution system is the open basin type located on top of the
cooling tower with polypropylene nozzles embedded on the FRP basin floor to
distribute hot water by gravity to the fill packing section below evenly. For multiple
cells cooling tower, each cell will be provided with a single inlet pipe connection to
regulate the hot water to each cell while distribution of the hot water within the
tower cell will be provided with a hot dip galvanized cross over pipe with all flow
control valves attached at discharge outlets to regulate volumetric flow. Water
levels of all individual hot water basins are regulated and maintained at similar level
by the cast iron flow control valves at each pipe discharge outlet. Hot water
discharge from the flow control valves enter into the FRP splash boxes to ensure
even distribution as well as prevent water splashing out of the cooling tower. Since
performance of the cooling tower is very dependent upon the distribution of the hot
water over all the splash bars, a very efficient splash box of FRP design has been
developed to provide even distribution and prevented water which may contain
water treatment chemicals from splashing to the tower surroundings or onto the
personnel operating the cooling tower.

Fill Packing System

The fill packing system for the PET 300 & 400 FC Series
consist of extruded polypropylene splash bars supported on
grids made of heavy gauge SS304 stainless steel. The
splash bars are installed in the cooling tower extending from
the operating water level in the cold water basin to the hot
water basin above and cover the entire air inlet area along
the longitudinal sides of the tower. Each piece of splash bars
is supported by 3 pieces of supporting grids and each grid is
directly attached to tower framework member using grid
hangers with SS304 stainless steel fasteners. Grids are
welded at all contact points to ensure the dimension and
shape is always maintained and rigid to prevent deformation
or distortion of the grids when splash bars become very
heavy when they become contaminated.

All splash bars are installed and with fixed configuration on the supporting grids to evenly expose maximum surface area for
hot water and ambient air interaction to allow for efficient evaporation to take place. The newly developed splash bars with the
triangular profile has proven to be very efficient in providing extended surface area for heat exchange as well as reducing the
rate of sludge build up rate compare with the timber splash bars due to its smooth surface and profile shape. Life expectancy of
the PP splash bars is also expected to be longer than timber splash bars since the PP splash bars are not subject to decaying
erosion. Maximum continuous operating temperature of the PP splash bars is 80”C while intermittent maximum temperature is
85”C. This temperature limits exceeds most cooling water temperature in the industrial processes.

Drift Eliminator System

Since PET Series cooling towers are specifically designed
to handle all kinds of industrial cooling water including very
dirty and contaminated water, the drift eliminator systems
installed are capable of allowing high deposition of muck
commonly found in most cooling tower as well as allowing
the drift eliminator system to be cleaned without damaging
the materials easily. The drift eliminator system is installed
inside the tower at the entire air exit plane after air passing
through the fill packing system. The drift eliminator system
is designed with a two pass drift elimination to remove all
the larger water droplets carried by the moving air stream
and to eliminate the drift loss to as small as 0.01% of the
total circulation flow rate.

Drift eliminator panels are assembled from extruded PVC
profile which provides features which restrain airborne water
droplets as airflow passing through the eliminator panels.
The extruded materials used for the eliminator panels are
made to provide the rigidity and durability for the
application. Moreover, eliminators are factory assembled into panels which are readily to be installed into the cooling tower with
ease thus making installation, maintenance and replacement becomes very easy. This innovative drift eliminator system has
completely address many problems previously encounter with using timber drift eliminator such as algae growth due to
exposure to sunlight and missing and broken timber eliminators each time after cleaning. This drift eliminator system had also
successfully proven itself far more superior to PVC drift eliminator system made of thin PVC film formed into honeycomb shape
type in terms of life span and durability.

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email: [email protected] Website: www.panwater.com

Product Information…

Mechanical Equipment

The mechanical equipment consisting of the fan assembly,
gear speed reducer, drive shaft and electric motor forming
the fan machinery to produce the airflow required for the
tower is supported on a common sturdy base. It is located
on top of the cooling tower along the tower axis and housed
within a FRP fan stack to operate efficiently and safely.

The fan machinery consist of energy efficient axial flow
adjustable pitch propeller fan with the fan blades made of
hollow FRP construction and the fan hub made hot dip
galvanized steel construction dynamically balanced with the
fan blades tip speed operating not exceeding 60 m/s. The
fan assembly is mounted on a spiral bevel gear speed
reducer and operates at an optimum speed to achieve best
tower performance. Gear speed reducer used is specifically
designed for cooling tower application and has power rating
at least 2.0 the power of the motor power rating. Gear
speed reducer is oil-lubricated type with the lubrication
pipelines extended to the external of fan stack to facilitate
inspection and maintenance.

Electric motors of various voltages, frequencies and
operating speeds can be supplied but only reputable
manufacturer approved by Panwater will be used on the
cooling tower in order to enjoy the standard cooling tower
warranty provided by Panwater. Electric motors conforms to
IEC Standards and is totally enclosed fan cooled type with
IP55 protection and Class ’F’ insulation as minimum
requirement to provide complete protection against contact
with dust and the effects of water. Materials of construction
should have cast iron frame frames, terminal box, end
shields with oil seals, and polypropylene cooling fan. Motor is
located outside the humid air stream discharge by the fan
and seated on the unitized mechanical equipment support
common to the gear speed reducer to avoid contamination of
electric motor by the saturated and humid discharge air from
the cooling tower. All hold down bolts used for the motor are
of stainless steel material. Electric motor is designed to
operate with at least power rating 1.15 times to maximum
brake horsepower of the fan at duty.

Mechanical torque from the electric motor is transmitted to the gear speed reducer via a floating type drive shaft. The drive
shaft is designed with mechanical power rating of at least 2 times the power rating of the electric motor and is constructed from
carbon composite. Flexible elements of the drive shaft are also made from carbon composite while all hardwares of the drive
shaft are made of SS 316 stainless steel. The drive shaft is dynamically balanced at its operating speed and no lubrication of
any parts is required.

Having all the mechanical components carefully designed and put together as an complete fan machinery, it is very important
that all these mechanical components are mounted on a well designed and constructed mechanical supporting base to ensure
the entire fan machinery is operating efficiently and safely to maintain a long life span. Mechanical support for PCG Series fan
machinery are mounted onto an independent mechanical support fabricated from carbon steel and hot-dip galvanized after all
fabrication is completed. Emphasis has been given to the design of the mechanical support to ensure alignment of the drive
shaft is maintained within tolerance at all time during operation.

Fan Stack

The entire fan assembly system is housed within an
aerodynamically bell mouth FRP fan stack to minimize velocity
pressure loss as airflow passing through the fan stack as well as
providing a safe casing protection for both the operator and the
fan machinery .

FRP fan stack are designed with box profile reinforcement ribs
and molded with thick layers of FRP materials to ensure very
strong hoop stress to maintain rigidity during operation and very
long life span as well as to provide safety protection to operator.

Velocity recovery stacks for large diameter fans are also
available for high efficiency fan performance for optimum power
consumption. The fan stake is assembled from multiple panels of
similar design forming into a circular cylinder with all flanged
joints located at the outside for easy assembly and dismantling.

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