1958 Kellogg American compressor 321

[ohpoppy]

does anyone know what speed I should run this. The motor is a vintage 3 hp, which is larger then how it came. the pump recommended speed is 400-700 rpm, which is a 1958 recommendation. I see vendors selling this pump now (rebuilt or maybe new) and recommend it to be run at 1060 rpm with a 3 hp motor. I would like to run it that fast but worry it will be damaging to the pump.

this compressor is a huge 80 gallon industrial quality unit. I need 11 cfm @ 100 psi which it will do at 1060. yes, it has a smaller 2 stage pump then we see in modern times. its 230 single phase.

http://kelloggcompressor.com/wp-content/uploads/2013/10/LP321-Manual.pdf


https://www.ebay.com/itm/NEW-Kellog...454126?hash=item1a35a98e2e:g:QrUAAOSwvtFZwSHa

 

[454ragtop]

Both sources you list show a pump RPM of 400-800. I wouldn't run it faster than 800, probably beat it to death for diminishing return. I'd try it at 800 and go from there, can always add more storage or might need a bigger compressor.

 

[ohpoppy]

this one rates it on 3 hp


https://www.ebay.com/itm/1-3-HP-Air...647968?hash=item3af8c33d60:g:k8sAAOSwUMxZk8Bk

 

[marinusdees]

The faster you run it, the less efficient it is and the quicker it will break. Jus' sayin'.

 

[ohpoppy]

of course thats true.. thats true of everything.

I'm looking for someone with experience with these types of pumps that has knowledge of safe speeds to run them. the maker in 1958 may have had a conservative view of speeds or felt they sold compressors in different outputs so defined parameters would be helpful in marketing.

the present listings may be NOS, so pushing the limits may be helpful in getting rid of them or maybe they are right. I wonder if Kellogg is making the same pumps for 65 years.. maybe they are!

 

[Burl]

Not sure what year mine is, but it has a 1 1/2 HP motor, I would assume original. Not sure how to post a pic or I would.