2　Terms

2.0.1　Rotary machines

Rotating equipment used in various process and utilities in petrochemical plants.

2.0.2　Pumps

Machines used for transferring or boosting liquids.

2.0.3　Hydraulic power recovery turbines

Machines used to recover the energy from liquid pressure drop in industrial production plants，also known as hydraulic power recovery turbines.

2.0.4　Mechanical agitators

Machines comprising agitating impellers，agitating shafts，shaft seal systems and driving equipment（drivers，gear units，frames and couplings）.

2.0.5　Vacuum pumps

Machines used to draw vapor out of container，creating a vacuum inside.

2.0.6　Compressors

Fluid machines used to increase gas pressure energy and transfer gas with outlet pressure larger than 0.2MPa（G）or compression ratio larger than 3.

2.0.7　Fans

Fluid machines used to increase gas pressure and deliver the gas.The machines with outlet pressure less than or equal to 0.03MPa（G）or compression ratio less than or equal to 1.3 are defined as fans（including induced draft fans），and the machines with outlet pressure higher than 0.03MPa（G）but less than 0.2MPa（G）or compression ratio larger than 1.3 but less than or equal to 3 are defined as forced draft blowers.

2.0.8　Steam turbines

Machines using steam expansion to do work.

2.0.9　Expanders

Machines using gas expansion to do work for energy recovery.

2.0.10　Gas turbines

Machines using expansion of high temperature and high pressure gas generated from fuel combustion to do work.

2.0.11　Centrifuges

Machines using centrifuge force to separate liquid and solid particles or non-compatible liquids.