Bent fan blades
Bent fan blades
(OP)
We refurbish a 5 foot dia fan every 18 months - - Its what we call a paddle fan - -6 blades that are like the paddle on a paddle ship - -the blades are 3/8 thick and they push a heavily loaded mineral dust up the exit stack. - - the tips of the blades are always greatly bentbut we know there is nothing heavy or solid goes into the fan system.
I have two queries
1)If a thick steel blade constantly hits heavy mineral dust will it eventually bend even though the blade itself is still in very good paint condition after 18 months.
2)Are we correct in just making the fan blade tips red hot and straightening them with a hammer and is there a limit to how often we can do this - - are there any metallurgical things we should be avoiding - - it would be very undesirable for one of our "straightened area" to break free because it would send the fan massively out of balance
and also there would be a risk the piece of blade going like a missile.
Any comments much appreciated
Corrosionman.
I have two queries
1)If a thick steel blade constantly hits heavy mineral dust will it eventually bend even though the blade itself is still in very good paint condition after 18 months.
2)Are we correct in just making the fan blade tips red hot and straightening them with a hammer and is there a limit to how often we can do this - - are there any metallurgical things we should be avoiding - - it would be very undesirable for one of our "straightened area" to break free because it would send the fan massively out of balance
and also there would be a risk the piece of blade going like a missile.
Any comments much appreciated
Corrosionman.





RE: Bent fan blades
What is the largest particle size?
B.E.
RE: Bent fan blades
RE: Bent fan blades
RE: Bent fan blades
Learn the rules,so you know how to break them properly.
Dalai Lama
_____________________________________
RE: Bent fan blades
I would try to locate someone in your area well versed in the art of flame straightening metal to give you a short course in how to straighten your blade without the hammer and high heat.
As you state you are inviting a chunk to come flying off.
RE: Bent fan blades
If that is the case it should not make any difference to the efficiency of the fan. I would just leave them bent.
Now if only one blade is bent , that is a different problem.
B.E.
RE: Bent fan blades
Do you have the fan designation, this will tell you the types of blades. Do you have any design calcs or drawings of the as built model?
RE: Bent fan blades
TOP
CSWP, BSSE
www.engtran.com www.niswug.org
"Node news is good news."