axial (motion)
axial (force)
actuator
abradable seal
ASME Section VIII
API specifications
API 617
API 612
API 682
acoustic resonance
ambient temperature
axial thrust
axial compressor
axial force (thrust load)
axially split casing (horizontally split casing)
atmospheric pressure
amplitude
American Society of Mechanical Engineers (ASME)
American National Standards Institute (ANSI)
American Petroleum Institute (API)
availability