Centrifugal Fan Troubleshooting.
A centrifugal impeller can't be installed backwards. Its hand of rotation must be matched to the handing of the fan casing. The handing of the impeller and the casing can be mis-matched at manufacture but that is very unlikely. There are many other probable causes of the situation you describe, to do with the design of the system.
It is more likely, if you are describing an actual situation, that the fan motor is wired wrongly and the fan is running backwards (a reasonably common event). The fan will still deliver airflow, but at a much reduced performance.
Michael Reid. ■
Re: Centrifugal Fan Troubleshooting
Many thanks Michael,
and I am agree with you.
However I confused why "Dust Control Handbook" has written that problem! ■
Centrifugal Fan Troublshooting.
I would be sceptical of any other advice offered by that handbook.
Good Luck,
Michael. ■
Dust Control Handbook
Dear Michael,
Do you know any reliable handbook of dust control?
would you please suggest. ■
Centrifugal Fan Troubleshooting.
If you want to know more, "Industrial Ventilation" published by the American Conference of Governmental Industrial Hygienists is trustworthy and good place to start. It gives all the basics and is highly regarded. You can sort out most everyday problems if you use it.
"Fan Engineering" by Buffalo Forge Company is more technical and analytical.
Good luck.
Michael. ■
In Other Words....
Originally Posted by Michael Reid
Good Luck,
Michael.
....bite the dust (control handbook).
Well said. This is one helluva straightforward reply. We need more across these forums. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: Centrifugal Fan Troubleshooting
Dear Michael,
I have ACGIH however this is not a dust control handbook it is more about ducting.
for example it doesn't include dust suppression which is very useful nowadays.
what is your suggestion after this book.
Originally Posted by Michael Reid"Fan Engineering" by Buffalo Forge Company is more technical and analytical.
Good luck.
Michael.
■
Dust Suppression
Spraying Systems Company has a manual of applications for their products which is somewhat helpful but very generalised. Their products are used extensively for dust suppression. I suggest you look at this and adapt what you find to your need.
Dust suppression’s main application is in mining and quarrying and each minesite has local experience to apply to the basic techniques. These techniques will depend on the product particle sizes (in various grades), the moisture content in run of mine ore and the tolerable amount of moisture addition. As well, climate often has a large influence.
Chemical additions are a waste of money except for stabilising haul roads and maybe, capping stockpiles. Local experience is the determining factor as to their application.
Good Luck,
Michael. ■
Centrifugal Fan Troubleshooting
Dust Control Handbook include a fan troubleshooting chart.
it has mentioned a problem which I can not understand how it may happen:
Symptom: Too much airflow, high ft3/min
Probable Cause: Backward inclined impeller installed backwards (high horsepower)
Solution: Install impeller as recommended by manufacturer
or this one:
Symptom: Low static pressure, high ft3/min
Probable Cause: Backward inclined impeller installed backwards (high horsepower)
Solution: Install impeller as recommended by manufacturer
my question:
How backward inclined impeller can be installed backwards? ■