air compressor fill time?

[boros40]

I have a Saylor Beall with a 705 two stage pump 5 hp motor and a 80 gallon tank. It takes 9-10 min to fill from 0 to 150 psi. Does this seam like the right time?

 

[PsRumors]

Seems about right. Google air compressor calculator, run through the equation and see if it is displacing the air that the specs state it should.

 

[boros40]

I did that and it come up with about 12.13cfm. I expected higher. It was rated 17. I don't really get a over abundance of blow by from the crank case vent

 

[larry_g]

Have you confirmed that the compressor is turning at its 845 RPM rated speed? Is the inlet air filter clean and free flowing? Is this a new pump and compressor or a well used or a compressor made up of 'parts'?

lg
no neat sig line

 

[bts]

I am not familiar with this compressor but with most compressors these days they are sold stating the swept volume of the compressor. It gives it a higher number and makes it look good.
The actual output of the compressor can be between approx 65% to 75% of the swept volume of the compressor depending on the quality of the compressor.
12 cfm from a stated 17cfm is in the ballpark. Unless of coures the compressor is suppose to make 17 cfm then disregard anything I`ve said so far.

You can be down on cfm without losing a lot od air through the crankcase. It might be the valves are not sealing properly in the heads.

 

[71flh]

I have what I guess is the same compressor, but it goes to 175PSI and although I've never timed it, it seems faster.

I've stopped letting all the air out and just drain the water periodically...

Its a great compressor BTW. There's no wondering if its a good machine with this bad boy. I bought it used and changed the oil twice in a short time to hopefully clean it out. I've added about 50' of 3/4 black pipe with a filter/drier at the end and then the regulator.

Its the VT-735-80 in the link: http://www.saylor-beall.com/air_compressors/tank_mounted_vertical.php

It gives me air compressor wood

 

[boros40]

Larry, This is a used saylor beall compressor. I put new valves and copper gaskets in. It as I said does not have a real blow by pressure. I di measure the pulleys and did the calculation and it is only turning 535 rpm. So I think this is a exceptable cfm for the speed. I need to put it on line and give it a sand blaster test. I also neeed to get a new pressure switch. Points look worn.

 

[kams1973]

Compressor manufacturers will run their 5hp compressors at a lower rpm using a 3hp electric motor. Check the HP rating or amp rating on the motor. The numbers you gave sound about right for a 3hp motor.

 

[larry_g]

Larry, This is a used saylor beall compressor. I put new valves and copper gaskets in. It as I said does not have a real blow by pressure. I di measure the pulleys and did the calculation and it is only turning 535 rpm. So I think this is a exceptable cfm for the speed. I need to put it on line and give it a sand blaster test. I also neeed to get a new pressure switch. Points look worn.

So your running at 63% of rated speed. I would think that you could bump that a bit. Do a current check on the motor and see if it also running at ~60% of FLA at cutoff. If the current check confirms the numbers then you can stand to bump the speed.

lg
no neat sig line