Rotating equipment is generally referred to as equipment that moves back and forth or rotates. These equipment are often used to move fluids in different systems and include the following:

• Turbines that include gas turbines and steam turbines. . .
• Pumps that include Rotary pumps and reciprocating pumps. . .
• Compressors that include centrifugal compressors, rotary compressors and reciprocating compressors. . .

When designing process equipment, attention should be paid to the environment in which the equipment is used, it is important that the equipment used is resistant to corrosion or other harmful mechanisms in that particular environment. Also, during the design, proper maintenance conditions should be taken into account in order to ensure the safety and proper functioning of the equipment during their lifetime.

Some of the common API standards in rotating machines are as follows :