Vacuum machine 1/4 hp

Label 150 microns
2 cfm
Practice :
Evacuation of mixture inside pipe
Manifold used for measures
Desired pressure at - 30 psi / -30 deg C
Compressor unit : 1 hp / 736 W
Pipe : 1/4 "
Time during vacuum process : depend on pipe length.
If 3 m of length, g/m2 = 0.3 kg/cm2.
If refrigerant R22 flow 0.1 g/s through pipe.
1 psi equals 0.07 kg / cm2, vacuum time 4 seconds.
Evaporator pipe : +/- 10 m, vacuum time 40 seconds ---- kg sec / cm2
If 150 micron = 0.015 cm = +/- 4 seconds
If 2 cfm, used for < 2 pk