These are motors
built while taking into account one or more of the three standards for motors established by the petro-chemical industry to make sure the motors meet their special needs: IEEE 841, API 541 and API 547. There is much overlap between these three standards, an unfortunate consequence of the fact that such a large industry could not put together a single unified standard. Motors used in refineries may have HAZLOC requirements, because they may work in places where gas leaks and inflammable fluids might occur. Also, many motors are used for pumping liquids, from low-viscosity gasoline to heavy oil residues. High-speed, high-torque and increased reliability are the norm for motors in this industry.