Maximum Allowable Piston Speed
Different compressor applications
have different maximum allowable piston speeds. To calculate piston speed,
use the following equation:
PS
= Average Piston Speed, feet per minute
This equation calculates average
piston speed, which is the basis for all piston speed related ratings.
Instantaneous piston speed is different, since the piston accelerates
from zero velocity at the end of the stroke, and obtains a maximum velocity
during the stroke.
For most normal applications,
maximum allowable piston speed is restricted by compressor valve design.
The maximum piston speed for metallic valve plates is 900-1000 FPM, and
the maximum piston speed for non-metallic valve plates is 1100-1200 FPM.
For maximum piston speed see individual
cylinders in the DataBook. For
high pressure applications, piston speeds must be lowered accordingly.
See High Discharge Pressure,
for more information regarding high pressure applications Speed
Limitations for piston speed versus mean cylinder pressure.
For non-lube applications, allowable
piston speeds must be reduced. See Non
Lube Compressor Cylinders for more information regarding non-lube
applications.
Ariel
Corporation Application Manual
27-Jul-98