Que potência do compressor de ar devemos escolher?

There are some different types of air compressor such as reciprocating, vane, screw or centrifugal in market.
The filtered air is compressed typically 80 psig (5.5 kg/cm2) ~ 110 psi (7.6 kg/cm2). Air Tools use 90 psi (6.3 kg/cm2) in general.

SELECTION CRITERIA :

Compressor Type – Recommendation:

0 to 80 psi (5.5 Bar) : single stage air compressor
80 to 250 psi (17.2 Bar) / continuous usage of tools : two-stage air compressor

Total Air Consumption – Determine the total demand SCFM

Factors to Consider : demands of all air tools, equipments, and other air consumption variables. Air Compressor Capacity – Horsepower (HP)
Determined total demand SCFM : D ( 1 m3/min = 35.3147 SCFM )
and add approximately 20% for system variables or future growth. : D1 = D x 1.2
If D1 <= 100 SCFM : HP = D / 4
If D1 > 100 SCFM : HP = D / 5
* 1 HP = 0.7457 KW
Example :
If the air consumption of an air tool is 0.45 m3/min = 0.45 x 35.3147 = 15.89 SCFM
Add approximately 20 % for system variables or future growth. : 15.89 SCFM x 1.2 = 19.068 SCFM
Because 19.068 SCFM <= 100 SCFM , so the HP is 19.068 / 4 = 4.767
Approximately 5 HP air compressor is enough for continuous using.