Chemical Engineering September 2015 - 84

Water Management 2015 Special Advertising Section
Traditional values with innovative pump designs
After 75 years Carver Pump Co. continues to supply pumps destined for some of the
toughest industrial and military applications
signs are routinely being developed to insure
optimum performance.
Specifically designed for applications
that require moderate to high discharge
pressures, Carver has engineered a horizontal
ring-section multi-stage pump known as
the RS Series.
The RS Series is available in five sizes
refining,
power generation,
general manufacturing
and pulp/paper markets.
Carver RS Series pump
O
ver three-quarters of a century, Carver
Pump Co. has attained a reputation for
creating value by providing pumps of premium
quality with innovative designs for the
automotive, chemical processing, mining,
Boasting a product line known for its
rugged construction features, a variety of
horizontal and vertical end-suction pumps
for multistage, axial split-case self-priming
and API applications units are suitable for
land-based, mobile and shipboard installations.
With traditional values utilized in all
phases of the operation to produce units
of premium quality, new and innovative defor
flows ranging up to 1,400 GPM and pressures
up to 1,500 psi. Featuring a productlubricated
radial sleeve bearing as standard
and two matched angular contact bearings
to handle the thrust, a low-pressure suctionside
mechanical seal suits most requirements.
Depending on the installation or
application, these units are also available in
a dual bearing/seal arrangement as an alternative
design using ball bearings for both
radial and thrust loads, plus a balanced mechanical
seal for the discharge end.
Carver RS Series pumps are ideally suited
for industrial and process applications
including pressure boost systems, boiler
feed, reverse osmosis, desalination and
mine dewatering. www.carverpump.com
Traveling screens keep debris out of cooling systems
To protect pumps and heat exchangers downstream of cooling towers, traveling screens
do a better job than traditional fixed screens, says Industrial Cooling Tower Services
C
ooling tower sump screens are intended
to protect circulation pumps and downstream
heat exchangers from fouling and
blockage. Unfortunately, says Industrial
Cooling Tower Services, traditional fixed
screens perform this important task rather
badly. As a result, pump failures and heat exchanger
efficiency losses due to debris continue
to pose big maintenance challenges.
The problem lies in the periodic cleaning
that fixed screens require, and specifically
the action of lifting the vertical screen out
of the sump pit. This stirs up debris lying on
the bottom of the sump pit, while the absence
of a pressure drop below the screen
as it is being lifted creates an undertow that
pulls debris off the front face of the screen.
In the case of a single fixed-grate
screens, this loose debris moves directly
into the suction pit. With a double screen,
debris released by cleaning the first screen
will be trapped by the second screen -
only to be released again when the second
screen is lifted.
According to the company, the solution
84
is a traveling screen that moves in a vertical
plane around two sets of rollers: one at the
bottom of the sump pit and the other above
the waterline. As the dirty screen moves up
and over the top roller, a spray header backwashes
debris into a collection tray.
The Vari-Flow SS Series Traveling Sump
Screen is designed for simplicity and toughness
to withstand the challenging environment
of a cooling tower sump. It is rotated
either manually or electrically, depending
on size and process requirements. Typical
mesh size is 0.375 in. Construction is in
corrosion-resistant stainless steel, plastics
and composites.
Since cooling tower sump screens do
not conform to standard size guidelines,
each Vari-Flow SS Series Traveling Sump
Screen is custom-designed for the application
it serves.
Most facilities view cooling water pump
failures and heat exchanger fouling as
largely inevitable, says Industrial Cooling
Tower Services, and fail to investigate the
root causes. With many problems due to
Traveling screens avoid the problems
associated with cleaning fixed screens
inadvertent release of debris from fixed
screens, a traveling screen is often a better
alternative.
www.ictsinc.com
ChemiCal engineering www.Chemengonline.Com September 2015
http://www.carverpump.com http://www.ictsinc.com http://www.Chemengonline.Com
Chemical Engineering September 2015

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