All polyesters a
IP66nd vinyl esters are corrosion resistant to some degree。
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, 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
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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
digital signage, aerosols in fan driven systems can be considered as being dilute concentrations of the chemicals composing the aerosols
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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, the wet gas down streamfrom the scrubber could be quite
dilute but more corrosive because of the scrubber’s converting the
sunlight readable fumes to an aerosol
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Standard
FRP fan construction does not include the use of surface veil。 Years of
service prove this construction to be cost effective and functionally
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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
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designer should have sufficient knowledge of, or experience with, 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
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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
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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
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interfere with the corrosion-resistant properties of the fan。 Graphite
is extremely corrosion resistant。 However, the addition of the graphite
makes the surface softer than normal and prevents the normal checking of
the surface for Barcol-hardness readings。