Question about air flow around pump head
I recently purchased the portable 3 gallon 125PSI horizontal single tank model.
I ended up returning the first two because of leaks around the quick connect valve (1st one) and total pump failure (2nd one).
The third model does not leak around the quick connect however I can feel quite a bit of blowing air around the pump head.
The tank gets up to 100+PSI so I'm thinking this must be normal. I cannot see where the air is coming from exactly but it may be coming from two different locations - one around the oil filler and the other somewhere near the top of the head.
If the seals on the pump were leaking I would think the tank would never get to pressure. Am I correct here? Or should I just bring this back to Sears and pay for a better unit (>$200)? Thanks.
Sounds like you have another lemon. Air should not be blowing around the pump head, at least, not unless it's fan cooled.
It were me, I'd take it back.
Craftsman air compressor - what is the flow?
It's a 2hp,25gal tank with the piston head, we bought it between 1994- 1996, we need to know the scfm on it.
The important piece of information that you have provided me to help determine the compressed air flow from your compressor is the HP of the motor.
It's generally understood that a compressor will generate about 4 CFM of compressed air at about 90 PSI for every horsepower of motor size. That's the norm for compressors over 10 HP in size.
For a 2 HP motor, it will be a little less, yet you should expect to generate between 5 and 8 CFM at 90 PSI from your compressor.
I can't be exact as different manufacturers have different efficiencies in their compressor pump design, and where you are in relation to sea level, the air temperature and the humidity of the ambient air all affect compressor production.
The important piece of information you didn't include in your question was...at what pressure?
The higher the compressed air pressure required, the less the flow that can be generated by a specific compressor. While yours may generate 5-8 CFM at 90 PSI, if you only require 40 PSI for example, the flow will increase.
I'm sure there is a formula that allows one to determine the flow rate change based on differing output pressures, but I don't have that. Can anyone else offer that for us and other visitors?
You might pop into your compressor store (big box store?) and look at the compressors on display. Find one with a 2 HP motor and see (they should show you on the tag) what the output flow is at 90 PSI and usually at 40 PSI too. That will give you a good indication of what you can expect on yours.
Thanks for writing in from Calgary.