A repair-replace decision model for petro-chemical industry electric motors

There are several repair standards, such as IEEE 841-2001 and IEEE 1068-1996, specific to the petrochemical industry. The electric motor repair industry is largely represented by the Electrical Apparatus Service Association (EASA), headquartered in St. Louis, Missouri. EASA serves 2500 members worldwide and has developed standards and guidelines dealing with the repair and service of electric motors. This paper presents the basic sources of a motor service and repair guideline and is built upon the experience of the EASA organization and its membership. Applicable elements from other guidelines and standards have also been incorporated (see below). The scope of this paper deals with squirrel-cage induction motors in the 1 to 3000 horsepower range-those typically found in the petrochemical industry. This paper examines the repair or replacement of the stator, rotor, shaft, bearings, fans and mechanical parts (hardware and accessories). Attention is also given to testing, verification, analysis and possible corrective actions to prevent or eliminate future failures. Options for motor replacement are also considered.