Gas vs Mist
Wet packed scrubbers of varying designs and efficiencies
have
been used for control of plating emissions
for many years, even though in many cases a
high efficiency mist eliminator would have
been a more efficient air pollution control
devise. The wet scrubber is actually the
correct choice of control for those
chemistries that evolve from the plating process in the
form of a
gas. These gaseous vapors are removed by the wet scrubber
via
gas absorption or mass transfer. Many chemistries evolve
from
the process tank in the form of a mist or droplets. The
mist
emissions from these chemistries and processes can be collected
by means of mechanical impingement or inertial impaction
with a
mist eliminator rather than a wet scrubber with continuous
irrigation of a packed section. The most common plating
applications for mist eliminator use in the last several
years have
been hard and decorative chromium plating and chromic acid
anodizing. But the use of the mist eliminator in lieu
of
the wet
scrubber is also applicable to other plating chemistries
and
compounds, many of the metal bearing chemicals.
Typical Chemistries that evolve in the form of a gas
are: Hydrochloric, Hydrofluoric and Nitric Acids, Nitrogen
Oxide,
Nitrogen Dioxide, Ammonia and Chlorine. Typical Chemistries that evolve in the form of a mist
are: Chromic Acid, Nickel Compounds, Coppr, Zinc, Sulfuric
Acid,
Anodizing, Cadmium and Sodium Hydroxide.
For more
information on the correct control device for your
application, contact our sales department.
Quote of the Day
"Good ideas are not adopted automatically, they
must be driven into practice with courageous patience."
New
Idea Saves Money by Michael Vanegas Hyman Rickover 1910
Did You Know
by Ray Steele
Plastics consist of very long molecules each composed
of carbon
atoms linked into chains. One type of plastic, known
as
polyethylene, is composed of extremely long molecules
that each
contain over 200,000 carbon atoms. These
long, chainlike molecules give plastics unique
properties and distinguish plastics from
materials such as metals that have short
crystalline molecular structures. Although
some plastics are made from plant oils, the
majority are made from fossil fuels. Fossil
fuels contain hydrocarbons which provide the building
blocks for
long polymer molecules. These small building blocks,
called monomers, link together to form long carbon chains
called
polymers. The process of forming these long molecules
from hydrocarbons is knows as polymerization. The molecules
typically form viscous, sticky substances known as resins
which
are used to make plastic products.
From the Estimating Department
by Steve Wiggington
Wow!! The Number of jobs, projects and parts to quote
is sure on
the increase. We have been very fortunate to have our old
customers and new customers to request price quotes from
Vanaire. I believe the economy is on the come back! Vanaire
is
doing its' best to get competative pricing to
our customers. Several customers have
come to us with new projects and there are
still those parts to price. Vanaire
Preventative Maintenance Programs
(PMP's) are very popular right now
Customers are revitalizing some of their old
equipment and require Vanaire's services to maintain and
clean the customer's systems. Vanaire services all manufacturer's
equipment (leaking duct, inspection on exhaust fans,
scrubbers, leaking fiberglass, kynar, polypro, etc
tanks). Vanaire can also supply stack testing. So be
first in line to get your project pricing from Vanaire
and we will keep the coffee pot on to get your prices
to
you very fast and efficiently!!!
Contact Us
10151 Bunsen Way
Louisville, Kentucky 40299
Phone(502) 491-3553
Fax (502) 491-5182 |
New Idea Saves Money
by
Michael Vanegas
Fiberglass containment sump trays for plating lines will
save site
preparation, cost & time. Vanaire has the perfect solution
to the
high cost and timely delays of preparing the job site prior
to the
installation of the plating line. Busting up concrete for
drain
trenches is no fun. Forming curbs or coating floors for
containment is no fun either, but those tasks must be
done
prior to
the placement of tanks. Or does it? Some OEM's are tired
of
being held up by the construction of containment pits and
the
outrageous costs of them. Vanaire has a solution
to all these problems with the introduction
of our new free standing fiberglass
containment sumps. The containment trays
will be custom molded and notched to fit
around the super structure of any automated
hoist system. The containment sumps will be
as long as the entire tank line and as wide as the tanks
plus a walk
way in front of the tanks. The tanks will set on 6" FRP
wide
flange beams inside the tray raising them off the floor
by at least
6", this keeps the tanks out of the chemical solutions
thereby
prolonging their integrity, The trays are a minimum of
18" tall.
With the tanks raised 6", the operator can reach deep
toward the
back of the tank due to the fact that he will be standing
on a 12"
elevated walk way. The walk way can be supplied with railing
and
stairs for the containment tray. Please ask our sales department
for an autocad drawing and a price for your fiberglass
containment tray today.
Regarding Job Layoffs in the U.S.
Joe Smith started the day early having set his alarm clock
(MADE IN JAPAN ) for 6 a.m. While his
coffeepot (MADE IN CHINA) was
perking, he shaved with his electric razor
(MADE IN HONG KONG). He put on a
dress shirt (MADE IN SRI LANKA),
designer jeans (MADE IN SINGAPORE)
and tennis shoes (MADE IN KOREA).
After cooking his
breakfast in his new electric skillet (MADE IN INDIA),
he sat
down with his calculator (MADE IN MEXICO) to see how
much he could spend today. After setting his watch (MADE
IN
TAIWAN) to the radio (MADE IN INDIA) he got in his car
(MADE IN GERMANY) and continued his search for a good
paying American job. At the end of yet another discouraging
and fruitless day, Joe decided to relax for awhile.
He put on his
sandles (MADE IN BRAZIL), poured himself a glass of wine
(MADE IN FRANCE) and turned on his TV (MADE IN
INDONESIA), and then wondered why he can’t find a
good
paying job in ...America....
Push-Pull Exhaust Systems
by Gary Vanegas PE
Exhaust systems designed to ventilate open top tanks come
in two
versions, general ventilation and local ventilation. Ventilation
is used
to provide desired air quality for health and safety of
building and
product maintenance. General ventilation is simply exhausting
room
air in sufficient quantities to provide the required environment.
This is generally ineffective and requires a lot of air
flow and
consequently money. Local exhaust systems are engineered
to collect
air from a pollution generating source through a system
specifically
designed to meet the particular need of a process. This
is
accomplished with greater control and less air flow saving
money. A
common design for local exhausting is to utilize collection
hoods
above or on the side of the process tanks. Side hoods
are the most
frequently employed method for their ability to minimize
obstruction
to the process. Push-pull is a more specific type of
side exhaust
which further optimizes this type of exhaust system.
Push-pull uses a jet of air to create kinetic momentum
pushing the ambient air above a process tank toward
a collector
(pull)
hood. The push air is directional in nature steering
most of the
energy of the air flow where it is best utilized. As
the jet flows
toward the pull hood, ambient air is gathered by friction
and
conveyed along with the push air stream. The combined
push jet and
ambient air must be exhausted by the pull hood.
The American Conference of Governmental
Industrial Hygienist has developed guidelines for
designing the push air and sizing the exhaust
hoods. These guidelines are meant to be used by
experienced engineers who understand the
broader system design. Consideration for airstream
influences such as obstructions and cross drafts must
be incorporated into the overall equation.
Common design problems for push pull systems become
evident when any component is skipped or misunderstood.
These
problems include blowing the contaminated air past the
pull hood or
creating the need for more pull air volume than is necessary
also
under sizing the push air where the kinetic momentum
is dissipated
before it can reach the pull hood. A well designed system
allows for
flexibility to make adjustments in the field. Each system
must be fine
tuned to meet the requirements of the process for which
it is
intended. To ensure your system is properly designed
and optimized,
contact a Vanaire technical representative. We will perform
a
complete study of the design for new or existing system
and provide
you with effective economical ventilation for your process
system |
