dottedzebra
Member
Hi everyone. I've been lurking here for a very long time and have found a lot of great information. I was hoping to get some help with a very specific question about a compressor I bought. Any help or input would be very appreciated.
I bought an old Speedaire compressor from an auto mechanic who was downsizing from two shops to one. His guess is that it was from the late 60's. I don't know how long he had it or how long he ran it the way it's now set up but he said he was using it right up to when he closed the shop.
It's a 60 gallon horizontal tank, The pump is a Kellog 325. When I bought it I didn't know how it should be set up, so I didn't think to check mortor rpm. Right now it has a 3450 rpm, 5 hp, 22 amp 7/8" drive motor on it. After looking up some info on it, I find this out:
Model:325
HP:3
PSIG:125
Pump RPM:836
Piston Displ:16
Free Air:11.7
Motor Pulley 60 Cy:6.4
Motor Pulley 50 Cy:7.4
# & size of groove:2-A
The compressor has a 5.5" (edited, not a 5") drive pulley and the pump has a 13 3/4" (edited, not a 9" pulley), giving the pump 1380 RPM (edited, not 1916), over double what the pump should be run at if I'm reading the above info correctly. I wired it and powered it up before I found the specs for the pump. It appeared to work great, obviously it filled up fast.
I'm assuming that it's a very bad idea to run the pump at well over twice the speed recommened.
My questions are:
Am I reading the info correctly?
If so, what could have been damaged by running it that fast?
Can I use it AT ALL while I look for a slower motor or different pulleys?
From what I can gather, it would need a 2.35" pulley
Would the following pulley work? It says it takes type a belts and is the correct shaft size. I have no idea what else to look for.
It's a 2.75 OD 2 groove pulley that looks like it would bring the rpm's down to 1054
http://www.surpluscenter.com/item.asp?item=1-2BK27-D&catname=powerTrans
All of this is very new to me so if I'm wording something wrong or anythings unclear, let me know.
Thanks for your time.
Mike
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I bought an old Speedaire compressor from an auto mechanic who was downsizing from two shops to one. His guess is that it was from the late 60's. I don't know how long he had it or how long he ran it the way it's now set up but he said he was using it right up to when he closed the shop.
It's a 60 gallon horizontal tank, The pump is a Kellog 325. When I bought it I didn't know how it should be set up, so I didn't think to check mortor rpm. Right now it has a 3450 rpm, 5 hp, 22 amp 7/8" drive motor on it. After looking up some info on it, I find this out:
Model:325
HP:3
PSIG:125
Pump RPM:836
Piston Displ:16
Free Air:11.7
Motor Pulley 60 Cy:6.4
Motor Pulley 50 Cy:7.4
# & size of groove:2-A
The compressor has a 5.5" (edited, not a 5") drive pulley and the pump has a 13 3/4" (edited, not a 9" pulley), giving the pump 1380 RPM (edited, not 1916), over double what the pump should be run at if I'm reading the above info correctly. I wired it and powered it up before I found the specs for the pump. It appeared to work great, obviously it filled up fast.
I'm assuming that it's a very bad idea to run the pump at well over twice the speed recommened.
My questions are:
Am I reading the info correctly?
If so, what could have been damaged by running it that fast?
Can I use it AT ALL while I look for a slower motor or different pulleys?
From what I can gather, it would need a 2.35" pulley
Would the following pulley work? It says it takes type a belts and is the correct shaft size. I have no idea what else to look for.
It's a 2.75 OD 2 groove pulley that looks like it would bring the rpm's down to 1054
http://www.surpluscenter.com/item.asp?item=1-2BK27-D&catname=powerTrans
All of this is very new to me so if I'm wording something wrong or anythings unclear, let me know.
Thanks for your time.
Mike
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