HANDLING CORROSIVES
Protective
coatings, special alloys, and FRP construction are available to combat
corrosion problems. Special coatings [up to 12 mil thickness] – special
paints and spray coatings are available under a variety of trade
names. Canada Blower works with experienced coating applicators who
can apply coatings to meet a wide range of requirements.
Alternate-material construction–Single-Width Fans can be constructed
of aluminum or various stainless steels.
HEAT-FAN CONSTRUCTION
Arrangement
1, 8, and 9 fans can be constructed for elevated temperature operation
with the addition of shaft cooler and guard and high-temperature paint
for 650°F maximum airstream temperature. Arrangement 9 fans are
also furnished with motor heat shield. If optional shaft seal is
selected, a recessed cone is furnished. Note that the maximum safe
wheel speeds decrease as airstream temperatures increase.
SPARK-RESISTANT CONSTRUCTION
[SRC]
Intended
to minimize the potential for any two or more fan components to
generate sparks
within
the airstream by rubbing or striking during operation. The following
types are available:
AMCA A [AIRSTREAM]
SRC: To include all airstream parts
constructed of a spark resistant alloy... maximum temperature:
200°F.
AMCA B [WHEEL]
SRC: To include the fan wheel constructed of a
spark-resistant alloy and a buffer plate around the housing
shaft-hole opening...maximum temperature:200°F.
AMCA C [BUFFER]
SRC: To include a spark-resistant alloy buffer
affixed to the housing interior adjacent to the wheel backplate, a
spark-resistant alloy inlet cone, and a buffer plate around
the housing shaft-hole opening... maximum temperature:650°F.
ALL TYPES
SRC: Fan is to be so constructed such
that no bearings, drive components, or electrical apparatus are
located in the airstream... the user must electrically ground all
fan
and system components. As compared to belt drive fan
arrangements, direct drive
Arrangement 4 fans of all styles, where the fan wheel
mounts directly onto the motor shaft, are more
compact, require less maintenance, and generally have a lower
first cost. However, relative
to belt-drive fans, they are limited in application, size, available
features,and the ability to adjust performance.
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