air compressor

[1WildRT]

Max pressure likely does not mean much. You are not going to be operating tools at that pressure. The important thing is the airflow rating and rated at 90psi. If it is given at 40 or SCFM (suction) you need to find a chart to justify the difference.

Amp draw is only better if the motor is actually putting out more power. Many modern motors are rated in amp draw and HP but the HP may be calculated from the amp draw, meaning, you can't figure the efficiency. True motor HP is rated by actual shaft HP. That means the amp draw, if higher, means less efficiency and more heat.

Read my earlier post. This scam works the same way as dancing around air flow figures.

BE CAREFUL if you consider ANY used compressor. Tanks can rust out, and just last summer there was a serious explosion in someone's garage.

The reason a higher tank pressure matters is you'll have a much greater volume of air stuffed into the same size tank so you can use more air than your pump moves for a longer period before the pressure falls off...

 

[67Dart273]

The reason a higher tank pressure matters is you'll have a much greater volume of air stuffed into the same size tank so you can use more air than your pump moves for a longer period before the pressure falls off...

Yeh but it should not be done that way. You should have a big enough pump to keep up

 

[1WildRT]

Yeh but it should not be done that way. You should have a big enough pump to keep up

Well, if you only have one person using air it's easy to know how big of a pump you'll need... But often that's not practical... Couple guys running cut-off/die grinders using 4-7 CFM @90 PSI each Maybe an air impact (25+CFM @ PSI but only for a short burst) or an air ratchet (4-6 CFM @ 90 PSI)... then someone running a spray gun or a blast cabinet.. Some HVLP guns use up to 30 CFM, most are around 15-20 CFM... Blast cabinets vary from a minimum around 12 CFM to upwards of 40 CFM @ 90 PSI.. Most everyone I know who owns a blast cabinet that isn't a commercial business waits for their compressor to recover....

 

[Demonic]

Pumping losses go up as the compressor runs against a higher pressure. If you really need volume, go to an 80 gal tank vs a 60. The compressor should be big and of high enough quality to keep up, as others said. The little single stage aluminum pumps are generally too small for sandblasting, DA's and other high volume use.

 

[YY1]

If you really need volume, go with a higher CFM.