Stormwalker

Ribbon Burner Blower Update

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I tried to post this in thread, but keep getting forbidden.  sigh.

As an update on the blower issue, I have done some more research, talked with one of the engineers that I work with that has done air balancing on ovens, and have come up with some helpful information.

I contacted Kayne and sons about the blowers they have, which by the way will do the job in SPADES.  The one piece of nomenclature that seems out of place is the way these blowers are rated with regard to static pressure.  Static pressure should be rated in inches of water column.  So the rating of the blowers in ounces of static pressure is deceptive.  They did reply to my inquiry and stated that the manufacturer rated them that way.  After 78sharpshooter posted his comment about having to choke his blower down so far, got me thinking about the nomenclature issue with the rating. I think the sp listed can be converted directly to PSI, and that in turn can be converted to water column.  going on that premise, the large 164 CFM blower that 78ss has would have 2.5 lbs. PSI of output,  that would translate to about 70 inches of water column pressure, which would explain why he has to choke it down so much, if the requirement of a ribbon burner is a minimum of 5 and 7.5 works better, then the wide open 70 that is available will totally exceed the requirement.  On a side note, because of the way centrifugal blowers are choked with the inlet being partially ( or mostly ) covered, the motor doesn't have to work as hard, because the impeller is spinning in a negative environment. The reason this works is because the motor doesn't rely on the impeller for air circulation, it has it's own fan for that.  As you can see, this is why speed controls don't work well with this type of blower, the motor can't get proper cooling at the lower speeds / higher current that use of a speed control will cause.

If anyone has more knowledge about this than I do, please weigh in.  These are conclusions I have reached through my research and from the real world experience with this set-up that 78ss presented in his post.

Thanks!

Storm

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I think there might be an error in your conversion because I doubt the 164 could blow bubbles if the output tube was placed 6ft down into a pool. I will try it to see at what point it fails to blow bubbles which should be the water column pressure.

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78, 

As I said in my original post, I am not sure of this calculation, but I would be interested to know..  give it a try and let us know what your blower will do wide open?  I have talked with several people about this.  and I wouldn't be at all surprised if it did blow bubbles 6 ft. down.

Storm

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If you look at Pine Ridge burners web site they have what appears to be the same blower and it is rated at 2.5" WC. It is also 164 CFM and the picture shows the same manufactures name on the side as the one at Kayne & Sons. I'm also interested in building a ribbon burner and using this blower. I have the 164 CFM from Kayne & Sons on my coal forge and would be willing to take it off and measure the inches water column.

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So I instead got some 3/8" ID clear PVC hose and hooked up the blower. It was about 2.25" WC. So I think a cheaper dayton blower from amazon would work fine for a brick and crayon ribbon burner.

20151002_164907.jpg

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I had a person mention to me at Quad State, Everyone has a compressor in his shop.  Why not hook the compressor to the burner using a gate valve to regulate the amount of flow?  I don't know and have not tried it.  If anyone tries it please let me know your results.  Size of the compressor, size of your plumbing, size of your burner, and if it worked did the compressor have to run constantly to maintain the pressure or what % of time it had to run.

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so put wear and tear on an expensive (and noisy) piece of equipment to do a job a cheap one does well?  

Historically compressor powered blowers were used to induce more air into the fire rather than just by their self; so more like a aspirated propane burner than directly into the forge. (and often for systems that existed before cheap small electric motors became common)

Edited by ThomasPowers

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78SS,  Many thanks for the WC test,  I am not sure why the blower is rated in oz. of static pressure, but it is good to know what the real water column number is.  

Thanks again to all the feedback from everyone.

Storm

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