Industrial process applications involve a wide variety of corrosive gas streams. Selecting the best materials of construction for air
handling equipment can be difficult. This article provides information about the
corrosion resistance of the resins used to manufacture standard FRP
fans.
Fumes are the dry vapors evolved from acids Cheap Jason Grilli Jersey , solvents, etc. An example is the dry acid vapor scavenged from a process using acid. As a generalization, fumes are not as
corrosive as aerosols. Aerosols are suspensions of liquids or solids in a gas
stream. For the purpose of this discussion, aerosols are considered as quite
dilutebeing wet. Water as fog is an example of an aerosol. Another example is
the mist of acid present in air scavenged from a process where acid is being
used as a spray wash. As a generalization for the purpose of estimating
corrosiveness, aerosols in fan driven systems can be considered as being dilute
concentrations of the chemicals composing the aerosols. An example of the
distinction between fumes and aerosols is a system where sulfuric acid fumes are
collected by hoods and scrubbed. The dry fumes entering the scrubber could be
quite concentrated but have a relatively mild corrosive effect on the hood and
duct material. On the other hand Cheap J.A. Happ Jersey , the wet gas down streamfrom the scrubber could be quite dilute but more corrosive because of the scrubber’s converting the fumes to an
aerosol.
Standard FRP fan construction does not include the use of surface veil. Years of service prove this construction to be cost effective and
functionally successful. However, the general approach to the design of most FRP
chemical process equipment, such as storage tanks, is to use surface veil.
Synthetic veil such as Nexus polyester veil protects the glass structure from
attack by chemicals that are particularly aggressive toward glass. The system
designer should have sufficient knowledge of, or experience with Cheap Devon Travis Jersey , the application to select the appropriate resin or alternate material.
FRP is inherently non-sparking and the electrical resistance of FRP may be considered infinitely high since it is essentially a
non-conductive or non-metallic material. Because FRP is nonmetallic, the
physical contact of two FRP parts or a metallic part with an FRP part will not
produce a spark. However, FRP does have the tendency to hold a charge of static
electricity. This charge can be generated by a dry gas or airstream passing over
FRP. The fan can ultimately become a capacitor capable of discharging
high-voltage, low-amperage sparks.
The static electricity or charge which builds up on the airstream surface of the FRP part must be eliminated in
applications where the fumes are potentially explosive. This can be accomplished
by making the surface electrically conductive, providing an electrical path to
dissipate the relatively low-current static charge. FRP fans can be effectively
grounded for the removal and control of static electricity by incorporating
graphite in the airstream layer of resin. Static grounding by graphite
impregnation does not interfere with the corrosion-resistant properties of the
fan. Graphite is extremely corrosion resistant. However Cheap Marco Estrada Jersey , the addition of the graphite makes the surface softer than normal and prevents the normal checking of the surface for
Barcol-hardness readings.
FRP fans are often the best alternative for those applications which require the handling of explosive, as well as corrosive
gas fumes. However, care must be taken to realize that there can be no
guarantees against possible sparking or ignition in such airstreams. All aspects
of the application, the system components, and even the potential for sparks
resulting from “tramp” or “foreign” elements in the airstream must be considered
to ensure the safety of the installation.
For additional information please refer to http:canadianblowerfansindex
Oleg Tchetchel
Industrial Process Ventilation Designer
oleg.tchetchel@canadablower
Canadian Blower
http:canadianblower
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